WO1995007569A1

WO1995007569A1 - Power distribution line switching method and control system therefor

Info

Publication number: WO1995007569A1
Application number: PCT/KR1994/000119
Authority: WO
Inventors: Tae Hyun Yim; Hyeon Suk Ra
Original assignee: Jin Kwang Corporation
Priority date: 1993-09-04
Filing date: 1994-09-05
Publication date: 1995-03-16
Also published as: AU7624794A

Abstract

A power distribution line automation switch control system comprises a microprocessor for receiving the detecting results from a current transformer, a current detection portion connected to a transformer on the power source and a voltage detecting portion connected to a transformer on the load to control all operation of a system and including a CPU, a timer, an interrupt controller, a decoder and an A/D converter; a ROM; an EEPROM; a SRAM; a memory for storing the information and data of said microprocessor; a display portion in the form of an LCD for representing information of currents, voltages, ground currents and information inputted by the selection of users according to the control of said microprocessor; a communication module for converting the inputted modem information into the digital series information, or the digital information from the microprocessor into the modem information; and an inputting/outputting portion for supplying the opening signal and the throwing signal from said microprocessor to an opening operation portion and a throw operating portion while supplying the state signal from a contacting point to said microprocessor, whereby the switch state is remote-controlled to exactly identify the operation state of a system, and the use of the microprocessor enables the record and keeping according to the communication and the operation state.

Description

POWER DISTRIBUTION LINE SWITCHING METHOD AND CONTROL SYSTEM THEREFOR

Technical Field

The invention is related to providing a power distribution line switching automation of a three phase and "Y" multi-grounds, and in particular, to providing an efficient operation method of a power distribution line switching automation and a control system of a power distribution line switching apparatus.

Background Art

A power distribution line in general includes a recloser co-operating with a circuit breaker and a line switch constituted as a substation (Substatier) breaker so as to remove transient and permanent failures, and an automatic section switch (Sectionalizer) which is a line section switch co-operating with a back up devices such as the recloser, the circuit breaker etc. so as to separate fixed sections from one another or a reclosing section switch capable of again being thrown for the same purpose of separating fixed sections from one another, which is operated therewith.

The power distribution line is also used with a tie switch which is always operated in a opened state at the position connected with lines of the other substations and banks.

The variety of the line operation and the full system become complex more and more, and the users are tendency to ask for the high quality services. Keeping pace with it, the necessity of a power distribution line is more emphasized. For example, the power distribution line operation system now will be explained in detail with reference to Fig. 1 to Fig. 4.

Referring to Fig. 1, a radial power distribution line system is the most simple configuration in respect of the operation, which uses a section switch such as an automatic section switch co-operating with a recloser of a conventional back up device so as to detect the breaking current and then separate the failure section from the good section by the assistance of a counter. The greatest number of the recloser to be able to be mounted is restricted to less than three, and the serial expansion of the power distribution line and the detail of the section have a limitation.

Another conventional system uses a section switch such as a reclosing section switch co-operating with a circuit breaker or a recloser, which is the back up device, so as to detect the breaking current to separate the failure section from the good section by the assistance of the counter timing. It is difficult to set the operation time of the reclosing section switch due to the switching of the recloser for assisting with the time delay opening operation, and the unreasonable problems occurs due to the correction of the operation time, when the recloser is instantly operated to remove the transient failure at a ground system.

Also, in the procedure of the reclosing section switch being thrown in the failure section after the failure identification, the recloser REC11 again interrupts the failure current so that a zero voltage is made, and all section switches SW11—SW12 on the other good section are opened and each again thrown in sequence after the completion of the timing. The more the number of mounting set, the more the recovering time increases. The number of the operation of each switch increases. Fig. 2 shows a block diagram of a branch power distribution line operation system which includes the adaption to the radial power distribution line system in a manner that the branch power distribution line is coupled to the single radial power distribution line. Thus, when the permanent failure occurs at the failure section next to a branch line, the conventional identification throwing procedures are performed so that the recloser REC21 is thrown, the section switches SW21 and SW22 are closed and then the section switch SW25 on the other good branch line side is simultaneously thrown when the failure section switch SW23 is thrown. But, thereafter it has problems in which when the recloser REC21 interrupts the failure current to cut a power, the section switch SW23 is opened to be locked out, the section switch SW25 is locked out and all section switches SW21 and SW22 are again opened. Also, the section switches SW23 and SW25 must be thrown according to their priority order not to lock out the section switch SW25, and behind the branching point the separate throwing timings must be set. Thus, it has problems in that the more the number of the branching point, the more the complex correction procedures are required, the inconvenient procedures is expected at the time of the increase or reduction of the line section and the complete recovering time of the good lines is relatively prolonged. Fig. 3 is a block diagram showing a loop power distribution line system, which includes a single radial power distribution line system to reversely supply the power source for the automatic recovering of good sections. The conventional loop power distribution line system throws the failure sections Fc and Fd during the reverse-supply of the power source, but it has a contradictory in that the operation to remove the failure sections through the good line on the B-power source is repeated. Thus, it is difficult to be adapted at the more detailed section. Actually, the conventional non-grounded system opens/locks out the section switches SW32 and SW33 on both ends of the failure section Fc to be able to reversely supply the power source. For example, if the section Fd immediately at the front of a coupling switch TS34 is broken, the section switch SW33 is opened/locked out to detect the zero voltage and control the timing without the throwing of the regular opened coupling switch TS34. It has disadvantages in that the number of the operation of each of switch SW31, SW32, SW33, SW35, SW36 AND SW37 is increased and the recovering time takes longer.

Disclosure of the Invention

Accordingly, the main object of the invention is to provide a radial power distribution line automation switching method for co-operating in removing the transient failure independent of the reclosing time of a recloser at first turn, reducing the number of the operation of a switch during the removing of the transient failure and shorting the line recovering time, significantly.

In order to accomplish the object, the radial power distribution line automation switching method of the invention comprises steps of co-operating in removing the transient failure independent of the instantaneous reclosing time of a recloser, opening/locking out only the switch of the failure section to separate the permanent failure section from the good sections without the unnecessary operation of forcing the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good section.

In the operation of the radial power distribution line automation switching system, the invention makes use of a power distribution line automation control section switching system (Sectionalizing Feed Automatic Switch) as described below to co-operate with the section switch. The power distribution line automation control section switching system counts the timing to remove the transient failure when the failure section Fa occurs, so that it forces the recloser REC11 to perform the instantaneous reclosing, thereby leading to the instantaneous power breakdown. Thus, all switches accomplishes only once counting operation with being thrown. If the failure section Fa is not removed and become the permanent failure, the recloser REC11 interrupts the failure current at the second time to cut the power, and all section switches are opened after the completion of the counting. Next, in order to perform the identification procedures, all switches SWll—SW12 are sequentially closed and then the section switch SW13 is thrown in the failure section. Whereby, the recloser REC11 performs the third trip operation to interrupt the failure current, thereby leading to the power cut. Thus, the failure section is separated from the good sections by opening/locking out (permanent-opening) only the section switch SW13. The section switches SWll—SW12 on the good line perform only the once time counting operation, but not opened. Therefore, the good lines are immediately recovered into the normal condition at the time of the third time throwing of the recloser REC11. If the radial power distribution line automation switching system is selectively co-operated with the circuit breaker, the circuit breaker is opened by only once time counting when the power supply is stopped. The section switches SWll—SW12, which are thrown in the procedure of the separation of the failure section from the good sections after the failure section throwing identification, is not opened again due to the sequential timing control function of the non-operation, and after the separation of the failure section the circuit breaker is reclosed into the recloser, so that the good section is recovered. It is possible due that all operations of the line automation control sections can be operated with the co-operations of the counting, the voltage or current detection and the timing.

Thus, the radial power distribution line automation switching system can obtain the co-operation in removing the transient failure independent of once reclosing time of the recloser, reduces the number of the operation of the switches by preventing the unnecessary operation of the good section switches during the removing of the failure section, shortens the finishing time of the line recovery and increases the number of the section switch SW to be mounted.

The other object of the invention is to provide a branch power distribution line automation switching system including a radial power distribution line switching system, for opening/locking out only switches of a failure section on the branch line to separate the failure section from the good section, so that it does not require to make the throwing timing of switches set different, prevents the reoccurring of the unnecessary power cut of the other good lines and shortens the recovery time. In order to accomplish these objects, the branch power distribution line automation switching system of the invention comprises steps of being placed under the co-operation in removing the transient failure independent of the instantaneous reclosing time of the back up device; opening/locking out only the switch of the failure section to separate the permanent failure section from a good section without the unnecessary operations which forces the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good section; and determining the failure line by which only the switch of the failure section opened/locked out to separate the permanent failure section from a good section while the switch of the other branch line is not again opened without the unnecessary operations which forces the good section switch of the other branch line to be again opened and thrown when the branch line in the failure section is removed in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good section.

The operation of the branch power distribution line automation switching system according to the invention is established dependent on the detection of failure current if the non-voltage is made during the counting of the lock-out timing after the throwing of the branch line automation control section switch. Thus, even if the recloser REC21 and the section switches SW21—SW22 are sequentially thrown and then the section switches SW23 and SW25 are simultaneously thrown in the procedure of the throwing of the failure section on the branch line as shown in Fig. 2, only the section switch SW23 in the failure section Fb is opened/locked out and the section switches SW21—SW22 are not opened, so that when the recloser REC21 is again thrown the failure section is recovered, immediately. For example, in case of the switch SW25, the possibility of the opening/locking out is determined according to the failure current detection during the timing period of the locking out when the power supply is stopped. Thus, the other good branch line, which the breakdown does not occur, is not opened even when the power supply is stopped during the proceeding of the lock-out timing count.

Accordingly, the branch line adapting to the line automation control section switch can find out the failure line in addition to the features of the radial line. Thus, it has advantages in that it is not necessary to make the throwing timing set different, the re¬ occurring of the unnecessary power cut in the other good line is prevented and the recovering time is more shortened as well as the mounting point of the branch line is increased.

Another object of the invention is to provide a loop power distribution line automation switching system including a radial power distribution line switching system for determining the possibility of the failure line throwing at the time of throwing the reverse-supply of a loop line, thereby preventing the unnecessary throwing of a failure section and the re-occurring of the power breakdown in the other line good line combined.

In order to accomplish these objects, the loop power distribution line automation switching system of the invention comprises steps of being placed under the co¬ operation in removing the transient failure independent of the instantaneous reclosing time of the back up device; opening/locking out only the switch of the failure section to separate the permanent failure section from a good section without the unnecessary operations which forces the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good section; and determining the throwing possibility of the failure line at the time of the reverse-supply, in which the automatic reverse-supply is not thrown if the section directly combined with the normal opened switch is broken down, and only the failure section is automatically separated if the other line section is broken down; maintaining the normal control function of the section switch in the good line thrown to reverse-supply the power, thereby establishing the line protection co¬ operation after the reverse-supplying of the power. The loop power distribution line automation switching system according to the invention is for reverse-supplying the power so as to automatically recover the good section in addition to the inclusion of all features of a single radial power distribution line automation switching system. Thus, the loop power distribution automation switching system has the control function of the radial line automation switching system and the lock-out function of the opening state and adapts a tie power distribution line automation switching system (called "Tie Feed Automatic Switch) for performing the sequence control of the counting operation of a tie switch for a loop line to be controlled in the co¬ operating system on the loop line, thereby dividing a line section into parts, not throwing the failure section, removing only the failure section even*in the sequence of the removing of the transient failure in the ground system and recovering the good line, quickly.

On the other hand, in order not to reverse-supply the power to the failure section a tie switch TS34 at the time of the co-operation of the failure section Fc and all failure sections as well as the co-operation of the failure section Fd is necessary to be locked out in the throwing or opening state. First, in case of the failure section Fc, the section switch SW33 is locked out with the non-voltage like the operation of the radial line co-operation function when the section switch SW32 is opened/locked out. Whereby, the section switches SW32 and SW33 at both ends of the failure section Fc and the tie switch TS34 can be thrown co-operating with the count operation sequence.

In case of the failure section Fd, the section switch SW33 is opened/locked out in the procedure of the identification throw. The tie switch TS34 having performed the sequence operation for removing the transient failure with the count operation is locked out with being usually opened at the time of completing the lock-out timing.

Accordingly, the loop power distribution line automation switching system according to the invention adapts the power distribution line automation control section switching system and the tie power distribution line automation switching system to provide the function of the sectionalizing feed automatic switch to the radial line switching system as well as to be locked out at the opening state. Thus, with the co-operation of the timing in addition to the sequence control function of the counting operation in the tie line automation control switch, the loop power distribution line automation switching system does not automatically throw the reverse-supply of the power if the section tied with the normal opened switch is broken down, while it automatically separates only the failure section from the good section and reverse-supply the power to the good section to be recovered, thereby enabling the power distribution line automation control section switching system to be maintained in the normal control function state.

Therefore, the loop power distribution line automation switching system is able to determine the throwing possibility of the failure line at the time of the reverse-power of the power on the loop line. It takes the features of the radial power distribution line automation switching system, prevents the unnecessary throw of the failure section and the reoccurring of the power failure in the other good section as well as maintains the auxiliary co-operation sequence for removing the transient failure in the ground system, thereby quickly and certainly performing its own duties even with being more divided into parts. But, as described above, the radial, branch and loop power distribution line automation switching systems can be used with the artificial complements, restrictively. Nevertheless, it is not actually enough in accomplishing the automation of the line switch. Still another object of the invention is to provide a complex power distribution line automation switching system including all operations and functions of radial, branch and loop power distribution line automation switching systems as well as a function for preventing the throwing of the failure section, if the switch of a line automation control section has the power sources applied to both ends with being opened. In order to accomplish these objects, the complex power distribution line automation switching system of the invention comprises steps of being placed under the co-operation in removing the transient failure independent of the instantaneous reclosing time of the back up device; opening/locking out only the switch of the failure section to separate the permanent failure section from a good section without the unnecessary operations which forces the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good section; determining the failure line, by which only the switch of the failure section is opened/locked out to separate the permanent failure section from a good section without the unnecessary operations which forces the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure, and the re-opening of the switch in the good section is prevented; determining the throwing possibility of the failure line at the time of the reverse-supply, in which the automatic reverse- supply is not thrown if the section directly combined with the normal opened switch is broken down, and only the failure section is automatically separated if the other line section is broken down; maintaining the normal control function of the section switch in the good line thrown to reverse-supply the power, thereby establishing the line protection co-operation after the reverse- supplying of the power; and preventing the throwing of the failure section, when the power sources on both ends of the section switch are existed during the reverse- supplying of the power, whereby the automatic switch control operation is performed for the co-operation of the line protection.

Accordingly, referring to Fig. 4, the complex power distribution line automation switching system of the invention will be described below: If a failure section Fe occurs, a section switch SW41 is thrown after a recloser REC41 is thrown in the procedure of the identification. Finally, a section switch SW42 is thrown to be opened/locked out, and then section switches SW43 and SW45 are opened/locked out like the operation of the loop power distribution line automation switching system as described above. Thus, tie line automation control switches TS44 and TS47 are thrown to reverse-supply the power after a predetermined timing period. Then, a section switch SW46 is thrown to separate the failure section Fe and recover the other good sections, thereby leading to the normal operation of a system.

Also, if a failure section Ff occurs, the section switch SW41 is opened/locked out. If the tie switches TS44 and TS47 are simultaneously thrown to reverse-supply the power, the section switches SW43 and SW46 are simultaneously thrown. Then, the section switch SW45 is thrown with the power source being applied to both ends of the section switch SW45, but on the contrary it is not thrown due to the throwing prevention function of the system, thereby maintaining the opening state. Of course, if one power source is dropped down, the normal control function of the section switch SW45 is recovered.

In case of a failure section Fg, the section switch SW43 is opened/locked out. The tie switch TS44 is locked out with being opened not to throw the failure section Fg. At that time the recloser REC41 is thrown, again. Then, the section switches SW41— SW42 are thrown, and the section switches SW45 and SW46 are thrown in sequence. At that time, the tie switch TS47 is connected to the power source A during the throwing timing period. Then, the power sources A and B are applied to both ends of the tie switch TS47, but to the contrary the throwing timing is reset, so that the tie switch TS47 is normally opened.

Therefore, the complex power distribution line automation switching system including the line automation control section switch and the tie line automation control switch has the control capacities obtainable by adapting radial, branch and loop power distribution line automation switching systems as well as a capacity of restraining the automatic throwing of the power to both end sides of a tie switch, thereby being able to accept it even though any branch loop line is combined with the system. Still another object of the invention is to provide a power distribution line automation section switch control system comprising ; means for detecting a three phase two voltage on both lines and being delayed/opened when the power source of one line side is broken down; means for throwing a switch after the elapse of a predetermined timing period when the voltage is applied with being opened; means for being opened/locked out when the power failure occurs during the counting of the lock¬ out timing after the throwing; and means for being locked out at the opening state when the lock-out timing is completed with being at the non-voltage, thereby detecting the voltage on a line and being controlled under the co-operation of the timing count operation. The power distribution line automation section switch control system comprises; a voltage and current restraining means for detecting/controlling the voltage and current of a line; a failure detecting means for detecting the failure current of a line; a counting means for performing only once counting operation and then being reset into the normal state with being opened, when the power source is broken down after the removing of the transient failure and then the successful throwing of a switch; a counter resetting means for resetting the counting number stored during the counting after the recovery of the normal state; a rush current restraining means for preparing against the rush current when the normal line is thrown; a counting/opening means not to open/lock-out a switch as soon as the correction of the counting coefficient is completed; an automatic throw restraining means for detecting the voltages of both sides of a line and preventing the throwing if both voltages are existed at the opening state; a sequence timing throw means for throwing the power after the throw timing elapse, if the power voltage is again applied during opening after the counting operation; once opening/locking-out means for preventing the opening at the detection of the normal current and for opening only one time and locking out at the detection of the failure current, when the power source is broken down during the proceeding of the lock-out timing after the throwing; an opening/locking-out means for not proceeding on the lock¬ out operation, immediately, if the non-voltage state is kept after the counting opening and for proceeding on the lock-out operation after the timing counting with being opened, if the power voltage is applied one time and then the non-voltage is maintained during the throw timing; a non-operation timing means not to perform the once opening operation even through the normal line is in the power failure during the sequence co-operation of the line after the completion of the lock-out timing with being thrown when a circuit breaker is co-operated by means of a selecting switch, thereby detecting the voltage and current on a line and enabling the timing and counting operations to co-operate with each other.

Still another object of the invention is to provide a normal opened tie control system for the automation of a line switch called a tie power distribution line automation switch control system, the normal opened tie switch control system comprising; a counting means for the sequence co-operation in removing the transient failure of a back up device; an automatic throwing means for being thrown and then controlling the sequence and timing so as to recover a good section after the completion of the throw timing if the power breakdown of any one line is maintained following by once counting corresponding the circuit breaker or twice counting corresponding to a recloser under the co-operation of the back up device; an opening/locking out means for being thrown and then controlling the sequence and timing so as to prevent the automatic throwing of a failure section with being opened/locked out after the completion of the timing due to it that the lock-out timing is proceeded and the power failure is maintained, if the power source is again broken down before the broken-down voltage is recovered and then reset in the sequence manner during the proceeding of the throw timing; and a sequence resetting means for returning from the opening state to the normal state after the completion of the resetting timing, when one voltage is recovered, thereby detecting the voltage on a line and enabling the timing and counting operations to co-operate with each other.

The invention can be accomplished using a single chip of microprocessor according to the co-operation relations of a recloser or a circuit breaker with information such as a current, a voltage, a phase, a state of a switch etc. in operating additional switches.

Brief Description of the Drawings Fig. 1 is a block diagram illustrating the configuration of a radial power distribution line;

Fig. 2 is a block diagram illustrating the configuration of a branch power distribution line; Fig. 3 is a block diagram illustrating the configuration of a loop power distribution line; Fig. 4 is a block diagram illustrating the configuration of a complex power distribution line;

Fig. 5 is a block diagram illustrating a section switching control system of a line automatic control according to the invention;

Fig. 6a and 6b are the detailed circuits of Fig. 5 ; Fig. 7 is a block diagram illustrating a control system of a tied line automation switching apparatus according to the invention; Fig. 8a and 8b are the detailed circuits of Fig. 7 ^; Fig. 9 is a block diagram illustrating a control system of a line automation switching control system according to the invention; Fig. 10 is a flow chart illustrating entire operation procedures of the line automation switching control system according to the invention;

Fig. 11 is a flow chart illustrating real time control interrupt operation procedures of the line automation switching control system according to the invention;

Fig. 12 is a flow chart illustrating communication interrupt operation procedures of the line automation switching control system according to the invention;

Fig. 13 is a flow chart illustrating operation procedures in which the line automation switching control system is selected in a section status according to the invention; and.

Fig. 14 is a flow chart illustrating operation procedures in which the line automation switching control system is selected in a tied status according to the invention.

Best Mode for Carry out the Invention

The invention will now be described in detail with reference to the accompanying drawings.

Fig. 5 is a block diagram showing a power distribution line automation control section switching system. The current flowing in a line is transformed through a current transformer 1 in a predetermined proportion and inputted to a phase/ground current detecting portion 2. The phase/ground current detecting portion 2 applies the rectified current to a constant voltage εtored-energy power source 3. The constant voltage stored-energy power source 3 combines the rectified current from the phase/ground current detecting portion 2 with the outputting voltage from a three phase line both voltages inputting portion 4 in an OR logic configuration. It enables a control voltage and a εtored- energy power necessary for the control system of the invention to be secured.

Also, a part of currents rectified at the phase/ground current detecting portion 2 is transformed into the voltage of a predetermined level and applied to a phase/ground failure current detecting portion 5 as a control signal in proportion to a line current, and the remaining current is supplied to a rush current restraining portion and a voltage/current restraining portion 7.

On the other hand, the line voltage is applied through a voltage transformer 9 positioned on the power source line 8 of a control system switch of the invention and a voltage transformer 11 on a load line 10 to the three phase line both voltages inputting portion 4, so that it is transformed into the voltage required for a control system as shown in Fig. 5. A part of rectified signals from the three phase line both voltages inputting portion 4 is provided to the constant voltage εtored-energy power source 3 along with the current signal rectified at the phase/ground current detecting portion 2 to assure the control power and the stored- energy power, and the other signals is inputted to a voltage detecting portion 12 to generate a signal based on the voltage detection.

The line voltage from the power and load line transformers 9 and 11 is inputted through the three phase line both voltages inputting portion 4 to a throw timing portion 13 and a throw operating portion 14 so as to combine the voltages from the power and load lines 8 and 10 in an AND logic configuration. The voltage detecting portion 12 divides the voltage signal from the three phase line both voltages inputting portion 4 into the predetermined levels and compares it with the reference level voltage, so that it determines the non-existence or existence of the line voltage. The voltage signal from the voltage detecting portion 12 is provided to the voltage/current restraining portion 7, the throw timing portion 13, a lock-out timing portion 16, a non-voltage lock-out timing portion 17 and a counter reset timing portion 18.

In particular, the voltage signal from the voltage detecting portion 12 receives a signal which combines the current εignal from the phase/ground current detecting portion 2 with the voltage εignal from a three phaεe line both voltageε inputting portion 4 in an OR logic configuration, so that it can controls the operation of the rush current restraining portion 6, an once opening portion 19 and a counter portion 20 dependent on the non- existence and/or existence of the line voltage and current as a current reεtraining means.

The constant voltage stored-energy power source 3 constitute the voltage source passing through the three phase line both voltages inputting portion 4 or the reference voltage necessary for the control circuit which is formed by the current passing through the phase/ground current detecting portion 2,- so that it εupplieε the power to the throw operation portion 14, the non-voltage lock-out timing portion 17, a opening operation portion 21, a trip outputting portion 22, an auxiliary contacting portion 23 and a control circuit power source 24.

The control voltage and reference voltage required for all circuits, which does not pass via the auxiliary contacting portion 23, are supplied from the control circuit power source 24. The output from the control circuit power εource 24 is turned off by a lock-out outputting portion 25 and turned on by the reεet signal of the throw operating portion 14, so that the control power source is controlled to be turned on and turned off. The auxiliary contacting portion 23 εupplies the control voltage through the constant voltage stored- energy power source 3 or the control circuit power source 24 to a non-operation timing portion 26 or the counter reset timing portion 18 and the counting portion 20. In other words, at the time of the throwing of a switch, the auxiliary contacting portion 23 supplies the power from the constant voltage εtored-energy power source 3 to a non-operation timing portion 26 and alεo the control power from the control circuit power source 24 to the counter reεet timing portion 18 and the counting portion 20. During the opening of the εwitch, the auxiliary contacting portion 23 εupplies the control power from the control circuit power source 24 to an on-voltage detecting memory portion 15 and the throw timing portion 13. Accordingly, when the power distribution line automation control section switching system again experienced the power failure after the instantaneous operation of the back up device for removing the transient failure or the completion of the throwing in the procedure of the identification throwing due to the line failure, it performs the counting operation as follows:

The signal of the voltage/current restraining portion 7 blocking the inputting of the counting portion 20 is released, and the counting portion 20 performs the once counting operation according to the stored-energy control signal from the auxiliary contacting portion 23. In other wordε, the counting portion 20 performs the once counting operation according to the εelection of the trip outputting portion 22 and a selecting switch SW2 which is a back up device of the counting portion 20 (referring to Fig. 6).

On the other hand, taking a look at the opening state by the counting operation, when the power source is twice broken down after the recovery of the line, the counting is completed by the second output from the counting portion 20.Thus, the trip outputting portion 22 generates a signal to operate a trip coil 27 of the opening operation portion 21, thereby opening a switch 28 (if the circuit breaker is cooperated, the switch SW2 is turned on to be opened by once counting operation as shown in Fig. 6) . The opening operation portion 21 supplieε the reεet εignal to the counting portion 20 so as to reset (initialize) the counting operation previously stored. The opening operation portion 21 also supplies the signal to the throw operating portion 14 to reset the on-voltage detecting memory state of the throw timing portion 13, the lock-out timing portion 16 and the non-voltage lock¬ out timing portion 17. If the instantaneous operation of the back up device remove the transient failure and then the line returns to the normal state by the reclosing of the recloser, the counting portion 20 is reset after the once counting operation as follows: The on-voltage output from the voltage detecting portion 12 and the control power passing through the auxiliary contacting portion 23 with being thrown are inputted into the counter reset timing portion 18 and operateε the counter reset device of the opening operation portion 21 after the completion of the predetermined counter resetting timing. Thus, the power distribution line automation control section switching εyεtem adapted to the invention returnε to the original normal control εtate.

Explaining the rush current restraining function, the voltage/current restraining portion 7 stops outputting the signal, which restrains the set operation of the ruεh current reεtraining portion 6 when the counting operation iε performed or the counting opening operation is performed, if the line is made into the power failure during the operation of the power distribution line automation control section switching εyεtem. The rush current restraining portion 6 performs the set operation by the two constant voltage stored- energy power paεsing through the control circuit power εource 24. It enableε the latch εignal to be applied to the input terminal of the phase/ground failure current detecting portion 5, thereby paralyzing the detecting function of the failure current. Thus, the εwitch of a switch control apparatuε according to the invention iε thrown and then restrainε the current detection for a predetermined time period, thereby performing the reεtraining function to the ruεh current.

To the contrary, the voltage/current restraining portion 7 εtopε outputting the εignal, which reεtrainε the εet operation of the ruεh current reεtraining portion 6 when the counting operation iε performed or the counting opening operation iε performed, if the line iε made into the power failure at the failure current εtate. But, the ruεh current restraining portion 6 is forced not to perform the set operation by the constant voltage stored-energy power passing through the control circuit power source 24 due to the failure detection delay output from the phase/ground failure current detecting portion 5. It means that the failure current detection is exactly performed under the situation that the power source is broken down, when the line is again thrown after the failure current detection thereby paralyzing the detecting function of the failure current. The procedures of performing the automatic throwing operation of the line automation control εection εwitching εyεtem opened after the completion of the counting because of the permanent failure of the line are as follows: The line automation control section εwitching εystem detects the line voltage to supply the detected signal through the three phase line both voltages inputting portion 4 to the voltage detecting portion 12, if the line voltage is applied thereto at the time of the re- throwing of the back up device. The on-voltage output from the voltage detecting portion 12 is inputted to the on-voltage detecting memory portion 15 along with the control power passing through the auxiliary contacting portion 23 to perform the on-voltage set operation. The latch output from the on-voltage detecting memory portion 15 is inputted to the throw timing portion 13 along with the on-voltage output from the voltage detecting portion 12 and the control power passing through the auxiliary contacting portion 23, so that the predetermine throw timing iε proceeded. The switch 28 is thrown while the throw timing portion 14 is reset by supplying the throwing signal to the throwing operation portion 14 and operating the throwing coil 29 when the throw timing is finished with the on-voltage being continuously applied. Also, at the time of the manual throwing operation, the throwing and control functions are reset by the manual switch of the throwing operation portion 14 to perform the normal control sequence.

On the other hand, if the voltageε of both lineε iε existed at the same time under the opening state after the completion of the counting, a part of the signal from the three phaεe line both voltageε inputting portion 4 restrains the throw timing portion 13, and the other part interlocks the throwing operation portion 14. Thus, the line automation control εection switch of the invention is not thrown by the automatic or manual operation. The line automation control section switch is finally opened in the failure section by only once throwing in the procedure of the identification throwing as follows. The line automation control section switch in the failure section is thrown, while the operation of the throw timing portion 13 iε blocked becauεe of the reεet operation of the throwing operation portion 14, and the pulεe generation of the counting portion 20 is blocked. In addition, the once opening portion 19 is set into the operation εtate. The lock-out timing portion 16 performε the lock-out timing by the on-voltage output. The voltage εignal in proportion to the line failure current from the phase/ground current detecting portion 2 is inputted into the phaεe/ground failure current detecting portion 5. The phase/ground failure current detecting portion 5 charges the failure detected signal at a capacitor and its output iε restrained by the voltage/current reεtraining portion 7. Thus, if the power source of the line is broken down with the operation of the back up device, the restraining operation of the voltage/current restraining portion 7 is εtopped and the counting portion 20 iε turned off. Therefore, the pulεe generation iε blocked and the once opening portion 19 iε operated by the failure current detection delay εignal (the diεcharge of the capacitor) from the phaεe/ground failure current detecting portion 5. At that time, the output of the once opening portion 19 iε applied through the trip outputting portion 22 to the opening operation portion 21 to energize the trip coil 27, thereby throwing the failure section to open the switch. While the output of the once opening portion 19 operates the lock-out outputting portion 25 to turn off the control circuit power εource 24, thereby the line automation control section switching syεtem being locked out (εtopping the operation of the control function). Aε a reεult, the switch of the invention enableε the failure εection not to be automatically thrown even through the line iε recovered to be under the applying of on-voltage when the power εource iε broken down after the failure current detection during the proceeding of the lock-out timing. In the procedure of the operation of the opening/locking out, the line automation control εection εwitching εyεtem iε opened and the counter iε reset by the switch of the opening operation portion 21 (not shown) (referring to Fig. 6) at the time of the manual opening operation. At that time, the control signal is applied to the lock-out outputting portion 25 to turn off the control circuit power source 24, thereby the line automation control section switching syεtem being opened/ locked out.

On the contrary, the line automation control section switch, which the failure current is not detected, is not opened even through the power source is broken down during the proceeding of the lock-out timing in the procedure of the identification throw of the line. In other words, at the moment that the restraining operation of the voltage/current restraining portion 7 is released, the counting portion 20 is turned off not to generate the pulse, even if the power source of the line is interrupted during the proceeding of the lock-out timing with being thrown. The phase/ground failure current detecting portion 5 can not output its detecting εignal, and the once opening portion 19 can not be operated. Similarly, if the failure current is not detected, the counting or opening operation iε not performed even through the power εource iε broken down during the proceeding of the lock-out timing. It means that the failure line can be found out when the failure happens behind the branch line.

On the other hand, the line automation control section switch in a good εection, which completed the lock-out timing with being thrown on the way to proceed the line εequence in the procedure of the identification throw at the line failure, iε not again opened, even if the power εource iε broken down. In other wordε, in caεe of the recloser of the back up device, the output from the lock-out timing portion 16 is supplied to the once opening portion 19 after the completion of the lock-out timing, so that the once opening portion 19 is turned off while the counting portion 20 is turned on, thereby recovering the switch to be made into the normal state. Thus, when the line automation control εection switch is thrown in the failure section and the power source is broken down in the procedure of the identification throw of the line, the line automation control section switch in a good section performs only the once counting operation, so that the good line is not opened, again. Thus, the failure section is removed, and the normal state is recovered by the reclosing of the recloser, whereby the line automation control section εwitch iε reεet in a counter reεet manner to return to the original εtate.

In caεe of the circuit breaker of the back device, the line automation control εection εwitch selectively useε itε functions for the co-operation with the circuit breaker in order to be not opened only by the once counting operation. The output from the lock-out timing portion 16 turns off the once opening portion 19 after the completion of the lock-out timing while does not turn on the counting portion 20 and operates the non-operation timing portion 26, so that the line automation control εection εwitch performs the non-operation sequence. Therefore, when the line automation control section switch iε thrown in the failure εection and the power εource iε broken down during the proceeding of the non- operation timing, the line automation control εection εwitch in a good εection enableε the once opening portion 19 and the counting portion 20 not to be operated aε well aε doeε not performε the counting and opening operationε. In that case, in order to proceed the non-operation timing during the power failure, the non-operation timing portion 26 iε eclectically connected through the auxiliary contacting portion 23 to the conεtant voltage εtored-energy power εource 3, εo that the operating (charged) power iε applied thereto. After the co¬ operation of the line protection iε terminated and the non-operation timing iε completed, the output from the non-operation timing portion 26 turnε on the counting portion 20 to make the line automation control εection εwitch return to the normal εtate.

After the counting iε completed, the line automation control section switch behind the failure section opened is opened/locked out as follows: At the moment that the line automation control section switch in the failure section iε thrown in the procedure of the identification throw of the line, the throw timing iε begun with respect to the line automation control εection εwitch behind the failure εection. When the power εource iε broken down on the line due to the operation of the back up device, the throw timing portion 13 iε reset by the off-voltage signal from the voltage detecting portion 12 during its operation, and the non-voltage lock-out timing portion 17 is electrically connected to the two constant voltage stored-energy power source 3 through the output from the on-voltage detecting memory portion 15 and the off- voltage from the voltage detecting portion 12 to be operated. It also enables the timing operation during the power failure.

Therefore, the line automation control section switch in the failure section is opened/locked out, and the line automation control section switch behind the failure εection provides the predetermined signal with the lock-out outputting portion 25 after the completing of the non-voltage lock-out timing. Thus, the lock-out outputting portion 25 performs the lock-out setting operation to prevent the power supply of the control circuit power source 24 to each circuit. It paralyzes the control functions of the power distribution line automation control section εwitching εyεtem, εo that the line automation control εection εwitch behind the failure εection is opened/locked out (into the permanent opening state). Thus, the line automation control section switch is not opened even if the voltage is applied thereto in a reverεe-εupply manner, and only the line automation control εection εwitch on both endε of the failure εection line iε permanently opened.

Fig. 6a and 6b are the detailed circuits of a power distribution line automation control section switching system as εhown in Fig. 5 according to the invention. Current flowing through a line is applied in turn to the first coil side and the second coil side of current transformers 1A, IB and IC which are mounted on each phase φA, B and φC. The current transformers 1A, IB and IC transforms the applied current into the predetermined ration to input it to a phase/ground current detecting portion 2. The forward current from the current transformers la, lb and lc iε made into the phase current through rectified diodes 2a, 2b and 2c forming an OR logic configuration, and the reverse current is made into the ground current through rectified diode 2d. The currents paεεing through the diodes 2a, 2b and 2c and the diode 2d in the phaεe/ground current detecting portion 2 each iε applied through a phaεe pick up reεiεtor 2e and a ground pick up resistor 2f to a diode 2g and then to a two constant voltage εtored-energy power εource 3. The current εignal applied to the conεtant voltage εtored-energy power source 3 iε combined in an OR logic configuration with the voltage εignal from a three phaεe line both voltageε inputting portion 4 passing through a voltage regulator diode 3a, while it is applied in sequence to the emitter and corrector of a power transiεtor 3b and then iε connected to the minuε (negative) εide of the rectifying circuit of the phaεe/ground current detecting portion 2. The base of the power transiεtor 3b is maintained at the constant voltage by a zener diode 3c, and its emitter is provided with condenεers 3d and 3e, εo that the conεtant voltage iε charged. In other wordε, the current paεεing through the current εource diode 2g is charged at the condenεer 3d, and the voltage from the three phaεe line both voltageε inputting portion 4 iε applied to the reεiεtor 3f and iε charged at the condenεer 3e through a voltage regulator circuit constituted as resiεtorε 3g - 3j, transiεtorε 3k, 31 and a zener diode 3m aε well aε through the diode 3a, εwitch 3n, diode 3p and a resiεtor 3q.

On the other hand, the line voltage iε applied from a three phase transformer 9 on the power line 8 and a three phase transformer 11 on the load line 10 of a line automation control section εwitch (referring to Fig. 5) to the three phase line both voltages inputting portion 4, transformed/inεulated (εeparated) by meanε of auxiliary tranεformerε 4a, 4b, 4c, 4d, 4e, and 4f and then rectified by each of diode 4g, 4h, 4i, 4j, 4k and 41 in an OR logic configuration. The rectified voltage iε kept at the regulated voltage by the voltage regulator circuit conεtituted as resistors 3g - 3j, transiεtorε 3k, 31 and the zener diode 3m. The regulated voltage iε applied through the voltage regulator diode 3a to the current εource diode 2g of the phase/ground current detecting portion 2 to be charged at the condenserε 3d and 3e, thereby smoothing/storing the control power. It can εecure the control power and the εtored-energy power aε a line voltage and current neceεεary for the control εyεtem of the invention, reεpectively.

A part of phaεe current εignalε rectified at the phaεe/ground current detecting portion 2 is applied through the phaεe pick up reεiεtor 2e to a reεiεtor 2h. The voltage formed by the reεiεtor 2h iε applied to the baεe of a tranεiεtor 2i to turn on the transistor 2i. Upon the turning on of the tranεiεtor 2i, the voltage paεεing through a reεiεtor 2j iε grounded through the collector-emitter of the transiεtor 2i and the collector become low. Thuε, the biaε voltage of the low εtate is applied to a resistor 2k, and a transistor 21 is turned off. The high signal through a reεiεtor 2m from the collector of the tranεiεtor 21 iε εupplied through a diode 2n to a rush current restraining portion 6 and a voltage/current restraining portion 7.

The other partε of phaεe current εignalε each is applied through resistors 2p and 2q to a phase/ground failure current detecting portion 5 along with the voltage εignal in proportion to the phaεe current from the phaεe current pick up resistor 2e and the ground current in proportion to the ground current from the phase current pick up resistor 2f. The voltage signalε tranεformed/inεulated at the three phaεe line voltage inputting portion 4 each iε rectified by rectifying diodeε 4m, 4n, 4p, 4q, 4r and 4ε, combined with one another in an OR logic configuration and inputted into the voltage detecting portion 12. The voltage signal is applied through reεiεtorε 12a and 12b, a condenser 12c, a zener diode 12d and a resiεtor 12e to the inverting terminal of a comparator 12f and the reference voltage iε applied to the non-inverting terminal of the comparator 12f. Thuε, the comparator 12f can detect the on-voltage of a line. If the on-voltage iε detected, the comparator 12f outputε the low εignal. Therefore, the voltage detecting portion 12 can detect the εignal according to the non-exiεtence or exiεtence of the line voltage.

Also, the three phaεe line both voltageε inputting portion 4 can detect the εingle phaεe voltage of both lineε by relayε Rl and R2 each having auxiliary contacting pointε MB1 and MB2. The outputε from these contacting points are inputted in an AND logic state to the throw timing portion 13 and the throwing operation portion 14.

During the normal operation, a line automation control section εwitch iε thrown εo that the voltage is applied to its both ends. If the current is flowed on the line, in the phase/ground current detecting portion 2 the voltage on the collector side of the tranεiεtor 21 iε applied through diode 2n to the ruεh current restraining gprtion 6 and the voltage/current restraining portion 7. Thuε, the bias voltage of the low εtate is applied to the base of a transistor 12m to turn off the tranεiεtor 12m, becauεe the comparator 12f of the voltage detecting portion 12 outputs the low signal.

Upon the turning off of the tranεiεtor 12m, the high signal paεεing through a zener diode 12n, a reεistor 12p and a diode 12q iε applied in an OR logic εtate to the diode 2n in the phase/ground current detecting portion 2 to restrain the non-voltage lock-out timing portion 17 and also to turn on a tranεistor 7b through a biaε reεistor 7a of the voltage/current restraining portion 7. Upon the turning off of the transistor 7b, the collector is made into the low state to force an once opening portion 19, the rush current restraining portion 6 and the counting portion 20 not to be operated. Furthermore, the transistor 12m of the voltage detecting portion 12 iε turned off and the high εignal iε applied through a reεiεtor 12r to the baεe of a tranεiεtor 12ε to turn on a tranεiεtor 12ε. The turning on of the tranεiεtor 12s enableε the low signal to apply through resiεtors 12u and 12v to the base of a tranεiεtor 12t, thereby turning off the transiεtor 12t. Thus, the output of the high εtate applied through a reεiεtor 12w to the collector of the tranεistor 12t restrains the operations of the on-voltage detecting memory portion 15 and the throw timing portion 13. The output of the low state from the collector of the transiεtor 12ε reεtrainε the operationε of a lock-out timing portion 16 and a counter reεet timing portion 18, so that the control operation is maintained at the normal state.

If the line failure happens, a back up device performs the inεtantaneous operation for removing the transient failure, or the line automation control section switch performε the counting operation with being thrown when the power εource iε again broken down in the procedure of the identification throw of the line. Upon the occurring of the power failure on the line, the voltage iε not interrupted by the pick up reεiεtor 2e to turn off the tranεiεtor 2i. The collector of the tranεiεtor 2i becomeε high by the reεistor 2j and the high signal is applied to the bias resistor 2k to turn on the transistor 21. At that time, the collector of the transiεtor 21 becomeε low.

Furthermore, in the three phaεe line both voltageε inputting portion 4 any voltage εignal is not applied to the auxiliary transformers 4a - 4f and the diodes 4m - 4s, while any voltage signal is not applied through resistorε 12a, 12b and 12e to the inverting terminal of the comparator 12f. Thuε, the comparator 12f applies the high level signal through the resistor 12j, the diode 12k and the resiεtor 121 to the base of the tranεiεtor 12m to turn on the tranεiεtor 12m. At that time, the collector of the tranεiεtor 12m becomeε low, so that the bias voltage iε not applied to the biaε resiεtor 7b of the voltage/current reεtraining portion 7, thereby turning off the tranεiεtor 7b.

Upon the turning off of the transiεtor 7b, the control εignal reεtraining the input with reεpect to the counting portion 20 iε released (removed), and the input with reεpect to the counting portion 20 iε applied through a reεiεtor 20a and a condenεer 20b to a reεistor 20c to turn on a tranεiεtor 20d. Upon the turning on of the tranεistor 20d, a relay coil iε once energized by the current flowing through a latch relay contacting point LR7B1. The energizing of the relay coil enables a contacting point RSA2 to be turned on (εimilarly, a contacting point RSAl iε turned on) while to apply the current paεεing through latch relay contacting pointε LR1B1 and LR1B2 to the relay coil RY1 to be energized. Thuε, a relay RY1A1 iε turned on to maintain the energizing εtate of the relay coil RY1.

At the same time, a contacting point RY1A2 iε turned on and a tranεistor 20f is turned on by the current pasεing through a contacting point RSA2 and a reεistor 20e. The signal pasεing through a contacting point RY1A2 and a resistor 20g iε grounded through the collector- emitter of the tranεiεtor 2Of to prevent a coupling condenεer 20h from receiving the εignal. Thuε, the baεe of the tranεiεtor 20d becomeε low and the relay contacting point RSAl iε turned off (while the contacting point RSA2 iε turned off). Aε the contacting point RSA2 iε turned off, any current iε not applied to the reεiεtor 20e and the tranεiεtor 20f iε turned off. Upon the turning off of the tranεiεtor 20f, the high level signal iε applied through the contacting point RY1A2 and the reεiεtor 20g to itε collector. Thuε, the current is applied to the coupling condenεer 20h and turnε on the tranεiεtor 20g through the reεiεtor 20i.

If the tranεistor 20j is turned on, a latch relay set coil LR1/S is operated to turn on the contacting point LR1A2, the contacting point LR1B1 iε turned off and the contacting point LR1A1 of a trip outputting portion 22 iε turned on. Thuε, if the line automation control εection εwitch co-operateε with the recloser, the counting portion 20 and εelecting εwitcheε SW1A and SW1B of the back up device are placed on the normal poεition aε shown in Fig. 6. Unlesε the reεet coil LR1/R of an opening operation portion 21 is normally operated, they continue to maintain the on-εtate, prepare againεt next sequence and perform the once counting operation. Therefore, the counting portion 20 memorizes only once counting operation and doeε not open the line automation control εection εwitch.

On the other hand, taking a look at the counting/opening εtate, if the line automation control εection εwitch co-operateε with the circuit breaker, the counting portion 20 and εelecting εwitcheε SW1A and SW1B of the back up device are placed on the poεition of the circuit breaker (SW1A iε off, SW1B iε on). The latch relay contacting point LR1A1 of the trip outputting portion 22 iε turned on and a relay of the trip outputting portion 22 iε operated. Thuε, the contacting point TRA1 of the opening operation portion 21 iε turned on through an auxiliary contacting point MA3. Thuε, the trip coil 27 iε energized and the εwitch 28 iε opened only one time.

If the εelecting εwitcheε SW1 of the back up device iε placed to co-operate with the recloεer (SW1A is off, SW1B is on) and the power source iε again broken down in the εecond operation due to the permanent failure not being removed by the once inεtantaneouε operation of the back up device, the relay contacting pointε RSA2 and RAS3 are turned on, and the relay coil RY2 iε energized. The operation of the relay coil RY2 turnε on a relay contacting point RSA2 and applieε the high level biaε εignal to a reεiεtor 20k to turn on a transistor 201. Upon the turning on of the transistor 201, the current pasεing through the relay contacting point RY2A2 and the reεiεtor 20m iε by-paεsed through the collector- emitter of the tranεistor 201 to ground, and the collector becomes low. Thus, a coupling condenεer 20n is under the diεcharged εtate. At the moment that the relay contacting pointε RSA2 and RAS3 are turned off, the tranεiεtor 201 is turned off.

Upon the turning off of the tranεiεtor 201, the collector becomeε high, and the current is applied through the relay contacting point RY2A2 and the reεiεtor 20m to the coupling condenεer 2On. The bias voltage iε applied to a reεiεtor 20p and turnε on the tranεiεtor 20q. The turning on of the tranεiεtor 20q enableε the current to be applied to a relay RR2. In that caεe, a relay contacting point RR2A1 of a trip outputting portion 22 iε turned on to operate the relay TR. As the relay TR is operated, the relay contacting point TRA1 is turned on, and the trip coil 27 is energized by the current pasεing through a εwitch protecting contacting point MA3 and a relay contacting point TRA1, εo that the counting/opening operation iε eεtablished only twice. Thus, if the relay contacting point TRA1 iε turned on, the reset coil LR3/R of the throw operating portion 14 is energized to reset the voltage detection memory, so that the lock-out timing operation is not proceeded even in a non-voltage state. The counting reset operation is aε followε: The counting/ opening operation is performed while the high level εignal iε applied through the relay contacting point TRA1, the reεistor 21a and the diode 21b to the base of the transiεtor 21c to turn on the tranεiεtor 21c, thereby operating the latch relay reεet coil LRl/R. Then, the latch relay contacting points LR1B1 and LR1A2 of the counting portion 20 and the latch relay contacting pointε LR1A1 of the trip outputting portion 22 iε reεet εo that the initial normal control εtate iε recovered. On the other hand, if the tranεient failure on the line iε removed by the once inεtantaneouε operation of the back up device and the line iε normally recovered by the throwing of the recloser, the counter reset operation iε performed by the timing aε followε: if the line voltage iε continuouεly applied after the once counting operation, the comparator 12f of the voltage detecting portion 12 outputs the low level signal to turn off the tranεiεtor 12m, but the transiεtor 12s is turned on by the high level εignal applied to the base through the zener diode 12n and the reεiεtors 12p and 12r, and its collector becomes low. Thus, the high level signal iε applied through a reεiεtor 18a of the counter reεet timing portion 18 to the collector of a tranεiεtor 18b. The tranεiεtor 18b iε εaturated to charge the condenεer 18f through a variable reεiεtor 18c and a base resistor 18e of a transistor 18d. If the charging operation is completed after the predetermined time elapεing, the level εignal iε applied through a reεiεtor 18g to the non-inverting terminal of a comparator 18h, so that the comparator 18h outputs the high level signal. The high level εignal iε applied through a reεiεtor 18i and a diode 18j to the baεe of the tranεiεtor 21c to turn on the transiεtor 21c aε well as to operate the latch relay reset coil LRl/R, εo that the latch relay contacting pointε LR1B1 and LR1A2 of the counting portion 20 and the latch relay contacting points LR1A1 of the trip outputting portion 22 are reset. The system of Fig. 6 returns to the initial normal control εtate.

On the other hand, the ruεh current restraining function iε aε followε: If the counting operation or the counting/opening operation is performed, when the power failure happenε during the operation of the line automation control section switch, the low level signal restraining the setting operation of the rush current restraining portion 6 is applied to the base of the transiεtor 7b in the voltage/current reεtraining portion 7 to turn off the tranεiεtor 7b. Thuε, the conεtant voltage εtored-energy power of the control circuit power εource 24 iε applied through a coupling condenεer 6a and a resistor 6c to the collector of the transistor 6b which forces the pluε εide of the coupling condenεer 6a in the ruεh current reεtraining portion 6 to be in the low level εtate. While, the low level εignal from the phaεe/ground failure current detecting portion 5 iε applied to the baεe of the tranεiεtor 6b. Therefore, the collector of the transistor 6b is kept at the high level εtate even in the power failure εtate. The εetting circuit of the ruεh current reεtraining portion 6 cauεeε the current to be applied through the reεiεtor 6c to the coupling condenεer 6a. Thus, the pulse εignal iε through a reεiεtor 6d to the base of a tranεiεtor 6e to turn on the tranεiεtor 6e as well aε to operate the latch relay contacting points LR6/S of the phaεe/ground failure current detecting portion 5. Next, the latch relay contacting pointε LR6A1 of the phaεe/ground failure current detecting portion 5 is turned on and the latch relay contacting points LR6B1 of the ruεh current restraining portion 6 is turned off, so that the comparators 5a and 5b of the phase/ground failure current detecting portion 5 iε grounded at the non-inverting terminal to force the current detection to be reεtrained. Thuε, if the control εignal iε generated at the time of throwing of the line, again, a condenεer 6h iε charged at the predetermined voltage by a variable reεiεtor 6h and a reεiεtor 6g of the ruεh current reεtraining portion 6. The charged current iε applied through a resistor 6i to the non-inverting terminal of a comparator 6j. If the input voltage is higher than the reference voltage determined by resiεtorε 6k and 61, the comparator 6j applieε the high level εignal through a reεiεtor 6m to a transiεtor 6n. Thuε, the tranεistor 6n iε turned on, and the latch relay contacting pointε LR6/R iε operated, εo that the latch relay contacting pointε LR6A1 of the phase/ground failure current detecting portion 5 iε turned off, while the latch relay contacting pointε LR6B1 of the ruεh current reεtraining portion 6 iε turned on.

Therefore, the current detection function iε delayed for the ruεh current reεtraining time period and then recovered, εo that it preventε the error operation when the good line is again thrown due to the failure of the other line.

On the other hand, the line automation control εection εwitch iε automatically thrown as follows, when the power εource iε again applied thereto after itε counting/opening operation. If the line voltage iε supplied at the time of the re-throwing of the back up device, the transiεtor 12t of the voltage detecting portion 12 is turned off to cause the high level signal to be applied to its collector. Thuε, the on-voltage detecting memory portion 15 generateε the control εignal by the current paεεing through a reεiεtor 12w and an on- contacting point MB3 under the opening εtate of an auxiliary contacting portion 23. For example, The current is applied through a reεiεtor 15a to a condenεer 15b. A tranεistor 15d is turned on by the biaε voltage of a reεistor 15c. A latch relay set coil LR3/S is energized, the contacting point LR3B1 of a throw timing portion 13 is turned off, the contacting point LR3A1 of a non- voltage lock-out timing portion 17 is turned on and the contacting point LR3A2 of the lock-out timing portion 16 is turned on. Thus, the throw timing portion 13 charges the current through a variable reεiεtor 13a to a condenεer 13c on the baεe of a tranεistor 13b at the predetermined level voltage. After the charging completion of the condenεer 13c, the high level εignal iε applied through a reεiεtor 13d to the non-inventing terminal of a comparator 13e. If the inputting voltage iε higher than the reference voltage, the comparator 13e outputε the high level εignal through a reεistor 13f to a transiεtor 13g. At that time, the tranεistor 13e iε turned on to energize a relay coil RR4 while to turn on the contacting point RR4A1 of the throw operating portion 14. At that time, the signal pasεing through a εwitch auxiliary contacting point MB4, inter-lock contacting pointε R1B1 and R2B1 and the contacting point RR4A1 iε applied through a diode 14a to a throwing coil 29. The throw coil 29 throws the εwitch 28. At the same time, aε the contacting point RR4A1 iε turned on, the latch relay coils LR3/R, LR5/S and LR7/S are energized to εet or reεet each operating portion aε deεcribed above, εo that the control functionε return to the normal εtate.

Alεo, upon the manual throwing operation, if the push button εwitch PB1 of the throw operating portion 14 iε turned on, the εignal passing through a εwitch auxiliary contacting point MB4, inter-lock contacting pointε R1B1 and R2B1 and the contacting point RR4A1 iε applied through a diode 14a to a throwing coil 29. The throw coil 29 can throw the εwitch 28. While the latch relay coilε LR3/R, LR5/S and LR7/S aε well aε a latch relay coil LO/R are reset, εo that the contacting point LOB1 of the control circuit power source 24 locked out iε reset at the opening state.

On the other hand, if the voltages on both sides are existed together at the opening state after the counting operation, the voltage on both sides of the line iε applied through auxiliary contacting pointε bl and mb2 to relayε rl and r2 in the three phaεe line both voltages inputting portion 4. Thus, the contacting points RlAl and R2A1 arranged in εerieε are simultaneously turned on, so that the operation of the throw timing portion 13 is limited and the throw timing function iε blocked. Alεo, all the contacting pointε R1B1 and R2B1 are turned off to interlock the throw operating portion 14, thereby restraining the throw of the εwitch.

The line automation control section switch in the failure εection iε opened/locked out only at one time aε followε, when it iε thrown in the procedure of the identification throw. Firstly, the failure current is detected during the occurring of the failure section as follows: The phase failure current flows through the phase pick up reεiεtor 2e of the phaεe/ground current detecting portion 2. The voltage of both endε of the phaεe pick up reεiεtor 2e iε inputted through the reεiεtor 2p into the phaεe/ground failure current detecting portion 5. The phaεe failure current is divided by a resistor 5c in a predetermined voltage and applied to a transistor 5d. Thus, the tranεistor 5d is turned on to cause the current in proportion to the line to flow through the emitter-collector of the transiεtor 5d. If the phase current iε a failure current, the voltage on both endε of a reεistor 5f divided by reεiεtorε 5e and 5f iε applied to the non-inverting terminal of a comparator 5a. If the inputted voltage iε higher than the reference voltage formed by reεiεtorε 5g and 5h, the comparator 5a generateε the high level signal to supply it through a reεiεtor 5i and a diode 5g to a condenser 5k. After the charging completion of the condenser 5k, a tranεiεtor 5m iε turned on by a reεistor 51. At that time, the signal applied to a resiεtor 5n is by-passed through the collector-emitter of the transiεtor 5n to the ground, and the collector becomeε low, while the εignal applied to a reεiεtor 5p doeε not turn on a transistor 5q. As the tranεistor 5q iε turned off, itε collector becomeε high, εo that the voltage εignal applied to a reεiεtor 5r iε applied through a diode 5ε to the contacting point LR5A1. In that caεe, the contacting point LR5A1 of the once opening portion 19 is already set at the time of the throw.^' Thus, the high level signal pasεing through the diode 5s iε applied through the contacting point LR5A1 and a reεiεtor 19a to a tranεiεtor 19b to turn on the tranεiεtor 19b. Itε collector becomeε low, and a transiεtor 19e iε turned off by reεiεtorε 19c and 19d. Thuε, the collector of the tranεiεtor 19e becomeε high by a reεiεtor 19f, which iε coupled with the collector of the tranεistor 7b of the voltage/current reεtraining portion 7 by a diode 19g, so that any operation is restrained unleεs the voltage and current on the lined is existed.

On the other hand, in case of the ground current, the ground failure current flows through the phase pick up resistor 2f of the phaεe/ground current detecting portion 2. The voltage of both endε of the phaεe pick up reεistor 2f is inputted through the resiεtor 2q into the phaεe/ground failure current detecting portion 5. The ground failure current iε divided by a variable reεiεtor 5c in a predetermined voltage and applied to a transiεtor 5d. Thuε, the tranεiεtor 5d is turned on to cause the current in proportion to the line to flow through the emitter-collector of the transistor 5d. If the ground current iε a failure current, the voltage on both endε of a resistor 50f divided by resistors 50e and 50f is applied to the non-inverting terminal of a comparator 5b. If the inputted voltage is higher than the reference voltage formed by resiεtors 50g and 50h, the comparator 5b generates the high level signal to supply it through a resistor 50i and a diode 50j to a condenser 50k. After the charging completion of the condenser 50k, a transistor 50m is turned on by a resistor 501. At that time, the εignal applied to a reεiεtor 50n iε by-passed through the collector-emitter of the transiεtor 50n to the ground, itε collector becoming low. The εignal applied to a reεistor 50p does not turn on a transiεtor 50q. Aε the transistor 50q iε turned off, itε collector becomeε high, so that the voltage signal applied to a reεiεtor 50r iε applied through a diode 50s to the contacting point LR5AL of the once opening portion 19. In that case, the contacting point LR5AL of the once opening portion 19 is already set at the on state at the time of the throw. Thuε, the high level εignal passing through the diode 5s iε applied through the contacting point LR5A1 and a reεiεtor 19a to a transistor 19b to turn on the transistor 19b, its collector becoming low. The transistor 19e is turned off. Thuε, the collector of the tranεistor 19e iε coupled with the collector of the tranεistor 7b of the voltage/current restraining portion 7 by a diode 19g, so that any operation iε restrained unleεε the voltage and current on the lined is existed. Therefore, when the power εource iε broken down after the detection of the failure current under the on- state of the contacting point LR5A1, the once opening portion 19 delays its output while the charged voltage of condenser 5k or 50k of the phaεe/ground failure current detecting portion 5 iε diεcharged through the reεistors 51 or 501. At that time that the tranεiεtor 7b of the voltage/current restraining portion 7 iε turned off, the high level signal from the once opening portion 19 is applied to the trip outputting portion 22 and the lock¬ out outputting portion 25.. Thus, the high level signal iε applied through a diode 22a and a reεistor 22b of the trip outputting portion 22 to a transistor 22c to turn on the transiεtor 22c. The voltage εignal applied to a resistor 22d is by-passed through the collector-emitter of the transiεtor 22c to the ground. A tranεiεtor 22f is not turned on by a resistor 22e. As the transiεtor 22f is turned off, the voltage εignal is applied through a reεiεtor 22g, a condenεer 22h and a reεiεtor 22i to turn on a tranεiεtor 22j. The tranεiεtor 22j iε turned on, the relay TR iε energized, the contacting point TRA1 of the opening operation portion 21 iε turned on. Thuε, the trip coil 27 iε energized and the εwitch 28 iε opened. Alεo, the high level εignal from the once opening portion 19 iε applied to the lock-out outputting portion 25. Thuε, the high level εignal iε applied through a reεiεtor 25a and a diode 25b to a transiεtor 25c to turn on the transiεtor 25c. In that caεe, a transiεtor 25d coupled in a Darlington configuration to the tranεiεtor 25c is alεo turned on, a latch relay setting coil LO/S is energized and the contacting point LOB1 of the control circuit power source 24 is turned off. Thus, the control power is turned off aε soon as being opened. It means that only once opening is the permanent opening.

In other words, the line automation control section switch of the invention can not be automatically thrown even though the line iε again recovered to the on- voltage, when the power εource iε broken down after the detection of the failure current during the proceeding of the lock-out timing. Alεo, when the manual throwing operation iε performed in the procedure of the opening/locking-out operation, if the puεh button εwitch PB2 of the opening operation portion iε turned on

(preεεed), the tranεiεtorε 25c and 25d of the lock-out outputting portion 25 are operated, the latch relay εetting coil LO/S iε energized, and the contacting point LOB1 of the control circuit power εource 24 iε turned off while the trip coil 27 iε operated and then the εwitch 28 iε once opened/locked out.

To the contrary, the counting or opening operation iε not performed even when the power εource is broken down, if the normal current iε detected during the proceeding of the lock-out timing (for example, the contacting point LR5A1 of the once opening portion 19 iε turned on) . Because the failure current of the once opening portion 19 is not detected and the latch relay contacting pointε LR5B2 of the counting portion 20 iε turned off.

The throwing/locking-out operation procedureε are aε follows: The input to the lock-out timing portion 16 iε supplied from the collector of the transistor 12s of the voltage detecting portion 12. In that case, the collector of the transiεtor 12s is in the low level state, and the resistor 16a of the lock-out timing portion 16 becomes low, so that the transistor 16b is turned off. At that time, the contacting pointε LR3A2 and LR6B1 are turned off, and a condenεer 16e is charged by the current passing through the resistor 16c and the base of a transistor 16d to proceed the lock-out timing. After the charging completion of the condenser 16e, the voltage passing through a resistor 16f is applied to the comparator 16g. If the inputted voltage is higher than the reference voltage, the comparator 16f generates the high level signal to supply it through a resiεtor 16h to a tranεiεtor 16i. The tranεiεtor 16i iε turned on, the latch relay reεetting coil LR5/R iε reset, and the contacting point LR5B2 of the once opening portion 19 is turned off. If the selecting switch SWla of the back up switch in the counting portion 20 is a recloser, the control circuit will be normally ready to perform the counting operation. Therefore, if the line automation control section εwitch in the failure εection iε thrown and the power failure appenε in the procedure of the throwing of the line, only the once counting operation of the switch previouεly thrown is performed, εo that the good line iε not opened, again. As a result, if the failure section is removed and the line returns to the normal εtate by the recloεing of the recloεer, the counter reεetting operation aε deεcribed above iε performed to recover the normal control εtate.

On the other hand, in caεe of the circuit breaker of the back up device, the puεh button switch SW1 is operated for the co-operation with the circuit breaker, the switch SWla of the counting portion 20 iε turned off, the εwitch SWlb of the trip outputting portion 22 iε turned off. Thus, even if the lock-out timing iε completed, the contacting point LR7B1 of the counting portion 20 iε turned off. On the other hand, the εwitch completing the throwing of the good line in the procedure of the throwing iε not opened only by once counting operation time, even if the power failure happens, again. To it, the non-operation timing is performed by the selecting switch SW1 aε followε:

Upon the throwing, the contacting point LR7A1 of a non-operation timing portion 26 is turned on, and a contacting point LR7B2 is turned off. The non-operating timing is performed after the completion of the lock-out timing. Alεo, the contacting point LR7B1 of the counting portion 20 iε turned off, and the counting operation iε not performed.

The power εource of the non-operation timing portion 2£ is inverted at the condensers 3d and 3e of the constant voltage stored-energy power source 3 through the diodes 3s and 3r and the contacting point of the auxiliary contacting portion 23 to the contacting point LR7A1 of a non-operation timing portion 26. Alεo, even if the contacting point LR5B2 of the counting portion 20 iε turned on upon the completion of the non-operation timing, the counting portion 20 doeε not perform with being opened by the εelecting switch SWla of the back up device. Thus, the contacting point LR5A2 of the non- operation timing portion 26 is turned off upon the completion of the lock-out timing, a condenεer 26c on the baεe εide of a tranεiεtor 26b iε charged by the current paεεing through a reεistor 26a, in which the condenser 26c iε connected to the anode of a programmable uni¬ junction transistor 26d. Thuε, when the voltage of the condenser 26c reacheε the reference voltage on the gate εide of the programmable uni-junction tranεiεtor 26d, the high level εignal iε applied through the cathode of the tranεistor 26d to a tranεiεtor 26e. The tranεiεtor 26e iε turned on, and the tranεiεtor 16f coupled in a darlington configuration with the tranεiεtor 26e iε also turned on to energize a latch relay coil LR7/R. As the latch relay coil LR7/R is energized, its contacting point LR7A1 is turned off, and a contacting point LR7B2 is turned on, so that the non-operation timing portion 26 is turned off. Thus, as the contacting point LR7B1 of the counting portion 20 is turned on, the pulse generating portion of the counting portion 20 is ready to perform the normal operation. Thuε, in case of the co-operation with the circuit breaker, the switch control syεtem in a good section is not again opened even if the power failure happens, when the non-operation timing is proceeded after the completion of the lock-out timing, and the sequence for the removing of the failure εection iε performed.

The line automation control εection switch iε locked out behind the failure εection with being opened after the completion of the counting aε followε: The latch relay reεetting coil LR3/R of the throwing operation portion 14 iε operated aε εoon aε the contacting point TRA1 of the opening operation portion 21 iε turned on during the counting/opening operation, and the contacting point LR3A1 of the non-voltage lock-out timing portion 17 is turned off. Thus, the non-voltage lock-out timing operation is not performed even if the non-voltage state is maintained after the counting/opening operation. It means that the throwing operation has been prepared. But, when the line voltage iε εupplied under the counting/opening εtate, the tranεiεtor 15d of the on- voltage detecting memory portion 15 iε operated, and the latch relay coil LR3/S iε set. Furthermore, the contacting point LR3B1 of the throw timing portion 17 iε turned off, and the contacting point LR3A1 of the non- voltage lock-out timing portion 17 iε turned on to supply the power voltage, thereby performing the throw timing operation aε described above. At that time, if the non- voltage εtate occurε during the throw timing operation, in the voltage detecting portion 12, the collector of a tranεistor 12t becomeε low, and the throw timing is reset. While the collector of the transistor 12m becomeε low, and the resiεtor 17b on the baεe εide of the tranεistor 17a in the non-voltage lock-out timing portion 17 becomeε low to turn off the tranεiεtor 17a. As the tranεiεtor 17a is turned off, the stored-energy power from the constant voltage stored-energy power source 3 iε applied through the reεiεtor 17c and the diode 17d to the collector of the tranεiεtor 17a. A condenser 17g connected to the baεe of a tranεiεtor 17f iε charged by the current paεεing through a variable reεiεtor 17e and the contacting point LR3A1. After the charging completion of the condenser 17g (the predetermined non-voltage lock¬ out time is elapsed), the programmable uni-junction transiεtor 17h beginε to be turned on. The voltage on the anode of the transistor 17h exceeds the voltage on its gate, the gate of which outputs the high level signal to supply it through a resistor 17i and a diode 17j to transiεtorε 25c and 25d. The transistorε 25c and 25d are turned on, the latch relay reεetting coil LO/S iε operated, and the contacting point LOB1 of the control circuit power εource 24 iε turned off, thereby paralyzing the control function of each circuit.

Aε deεcribed above with reference to Figs. 5 and 6, the line automation control εection εwitch iε locked (permanently opened). When the non-voltage lock-out timing portion 17 iε not necessary, the line automation control section switch is turned on by the separate selecting εwitch SW2. The non-voltage lock-out timing portion 17 may be not uεed. The adaption of the technology to the radial line or the branch line enables only the failure εection to be separated from the good εection. Thuε, it iε not neceεεary to lock out the line automation control εection εwitches. To the contrary, the moεt important function of the loop line or the complex line iε to exactly open/lock out both ends of the failure εection. Therefore, even though the reverεe-εupply voltage iε applied thereto, the line automation control section switch is not automatically thrown and permanently opened. Fig. 7 iε a block diagram illustrating another embodiment of an tie power distribution line automation switching syεtem (TFAS). The tie line automation control εwitch on the line iε operated with being nomally opened. The line voltage on the A-power εource line 101 iε applied through a tranεformer 102 to first three phase voltage inputting portion 103. The line voltage on the B- power εource line 104 iε applied through a tranεformer 105 to εecond three phaεe voltage inputting portion 106. The first three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 rectify the voltage εignalε inputted from the tranεformerε 102 and 105, reεpectively. A part of εignal rectified at the firεt three phaεe voltage inputting portion 103 iε εupplied to first voltage detecting portion 107, and the remaining portion is εupplied to a conεtant voltage charging portion 108. A part of εignal rectified at the εecond three phaεe voltage inputting portion 106 iε εupplied to second voltage detecting portion 109, and the remaining portion iε εupplied to the conεtant voltage charging portion 108. Herein, the first voltage detecting portion 107 and the εecond voltage detecting portion 109 determine the poεεibility of the non-exiεtence or existence of the line voltage. The constant voltage charging portion 108 receiveε the output voltageε from the first three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 to charge a condenser (not shown) . Then, the charged voltage is applied to a control power source 110 to supply the predetermined power to each circuit to be controlled. The signalε detected at the firεt and εecond detecting portions 107 and 109 are coupled in an exclusive NOR logic configuration with each other at a control logic portion 111. The εignal from the control logic portion 111 iε εimultaneouεly εupplied to the counter reεet timing portion 112, a counting portion 113, a throw timing portion 114 and a lock-out timing portion 115, so that the control logic portion 111 is controlled according to the possibility of the non-existence or exiεtence of the voltageε of both lineε. But, firεtly the counting portion 113 connected to the control logic portion 111, the throw timing portion 114, the lock-out timing portion 115 and the counter reset timing portion 112 can be controlled/operated in a sequence manner. The throw timing portion 114 receives the counting εignal from the counting portion 113 and the εignal from the control logic portion 111 to perform the throw timing operation, the output εignal from the throw timing portion 114 of which operateε a trip coil 116 to throw a εwitch 117 of the control εyεtem according to the invention. The lock-out timing portion 115 receiveε the εequence εignal from the counting portion 113 and the signal of the control logic portion 111 to perform the lock-out timing operation, the output of which enables a latch operating portion 119 to be set paεεing through a lock-out operating portion 118. Thuε, the latch operating portion 119 turns off the control power source 110, so that the tie line automation control switch 117 iε locked-out with being opened.

On the other hand, the counter reset timing portion 112 receives the signalε from the control logic portion 111 and the counting portion 113 to εupply itε output to a counter reεetting portion 120. The counter reεetting portion 120 receiveε the εignalε from the conεtant voltage charging portion 108 and the counter reεet timing portion 112 to reεet the counting portion 113. Alεo, when the tie line automation control εwitch 117 iε manually thrown, a throwing switch 121 operates the throwing coil 116 aε well as applieε itε output εignal to the lock-out outputting portion 118 to εet the latch operating portion 119 while to turnε off the control power εource 110, thereby locking-out the εwitch 117.

A opening εwitch portion 122 operateε a trip coil 123 by the power voltage from the conεtant voltage charging portion 108 to open the switch 117 when opened by the manual operation. A control resetting switch 124 iε connected through the constant voltage charging portion 108 to the latch operating portion 119 to perform the reεetting operation, εo that the control power εource 110 iε turned on by the reεetting εignal from the latch operating portion 119. Thuε, after the tie power diεtribution line automation εwitching εystem is reset by the control resetting switch 124, all control functions returns to the normal operation state. The operation of the tie power distribution line automation switching system as deεcribed above iε aε follows: While the tie line automation control εwitch 117 iε operated with being opened, aεεuming that the power failure happens once, when the back up device performs the inεtantaneous operation for removing the transient failure; the counting portion 113 performs the once counting function by the εignal from the control logic portion 111. At that time, the output from the counting portion 113 iε εupplied to the throw timing portion 114 and the lock-out timing portion 115, but in caεe that the back up device iε a recloεer, by the εelective co¬ operation of the recloser the counting portion 113 performs only the counting operating at first time, the throw timing portion 114 is operated at second time and the lock-out timing portion is operated at third time.

In case of a circuit breaker of the back up device, in co-operating with the circuit according to the function selection, the throw timing portion 114 iε operated at first time and the lock-out timing portion 115 iε operated at second time. Thus, the counting portion 113 performs only the counting operation, but does not generate the trip output. On the other hand, if the tie line automation control switch 117 iε thrown in a reverεe-supply manner, the power failure iε not removed and continued, and the back up device interruptε the εecond failure thereby to occur the power failure. At that time, in the tie power diεtribution line automation εwitching εyεtem, the twice counting εignal from the counting portion 114 iε εupplied to the throw timing portion 114 to be operated. Then, if the power failure iε maintained to be judged that the middle portion of the line iε in a permanent failure, the throw timing portion 114 iε operated to complete the throw timing. The output from the throw timing potion 114 is εupplied to the throwing coil 116. Aε the throwing coil is operated, the tie line automation control εwitch 117 iε thrown. On the throwing of the tie line automation control εwitch 117, the lock-out control function is as follows: The output from the throw timing potion 114 is εupplied to the lock-out outputting portion 118. Aε the lock-out outputting portion 118 is operated, the latch operating portion 119 iε operated. The εet output from the latch operating portion 119 turnε off the control power source 110, and the switch 117 iε thrown as well aε locked out (control function device). Next, with the failure εection being not thrown and opened, the lock-out procedureε are as follows: If the line failure occurs at the line section directly in front of the switch 117, the voltage is applied to the failure line for a moment during the proceeding of the timing, and immediately the third power failure happens. Thus, the front εection of the switch 117 is determined as the failure, and the lock-out timing portion 115 iε operated by the third sequence of the counting portion 113. In that caεe, if the power failure iε maintained and it iε judged that the switch 117 iε permanently opened, the lock-out timing portion 115 applies its output to the lock-out outputting portion 118 after the completion of the lock-out timing of the switch 117. At that time, the εetting output from the latch operating portion 119 turns off the control power εource 110 to lock out the control εyεtem.

Aε a result, the tie line automation control switch 117 doeε not throw the failure εection in a reverse- supply manner, but locks out it with being opened. If the lock-out state is intended to be released, the control resetting εwitch 124 iε manually preεεed, εo that the control power εource 110 iε turned on by the resetting operation of the latch operating portion 119. It means that the εyεtem can perform the normal control functionε.

When the line returns to the normal εtate during the performance of the εequence control by the counting operation, and all voltageε on both lines of the normal opened εwitch 117 are existed, the counting operation on the way to be proceeded iε reεet aε followε: The counter reεet timing portion 112 is operated by the outputs from the control logic portion 111 and the counting portion 113. If it iε judged that the voltageε on both lineε are continuously maintained and both lineε are normal, the output from the counter reset timing portion 112 iε supplied to the counter reεetting portion 120 after the completion of the counter reεet timing. Then, the counter resetting portion 120 is operated to reset the counting portion 113. Thuε, the tie line control εystem returns to the initial sequence control state. Also, when the εwitch iε automatically locked out with being opened or manually operated by the throwing switch portion 121, the counter resetting portion 120 is operated by the lock-out outputting portion 118 to reεet the counting portion 113.

Figs. 8a and 8b are the detailed circuits of Fig. 7 illust¬

rating another embodiment of a tie power distribution line automation εwitching εyεtem. The tie line automation control εwitch 117 iε configured to detect the voltageε on both lineε (A-power source and B-power source) with being normally opened. The three phase line voltage on the A-power source line 101 iε applied through a tranεformer 102 to first three phase voltage inputting portion 103. The three phaεe line voltage on the B-power εource line 104 is applied through a transformer 105 to εecond three phase voltage inputting portion 106. The first three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 rectify the voltage εignalε inputted from the tranεformerε 102 and 105, respectively, in which the firεt three phaεe voltage inputting portion 103 dropε the three phase line voltages at each transformer 103a, 103b and 103c, rectifies them at diodes 103d, 103e and 103f and rectifies them at diodes 103g, 103h and 103i, again and supplieε them to firεt voltage detecting portion 107 and a conεtant voltage charging portion 108, reεpectively, and the εecond three phase voltage inputting portion 106 dropε the three phaεe line voltageε at each tranεformer 106a, 106b and 106c, rectifieε them at diodeε 106d, 106e and 106f, and rectifies them at diodeε 106g, 106h and 106i and supplieε them to εecond voltage detecting portion 109 and the conεtant voltage charging portion 108 reεpectively. At that time, the conεtant voltage charging portion 108 receiveε the εignals from the firεt three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 through a resiεtor 108a, in which the received εignalε are maintained at the conεtant voltage by reεiεtors 108b - 108e, transistors 108f and 108g and a zener diode 108h and charged to condenεer 108i through a diode 108h', and the charged voltage iε formed as a conεtant voltage by a conεtant voltage control power εource including the diode 108j, the reεiεtor 108k and the condenεer 1081. On the other hand, the direct current εignalε from the first three phase voltage inputting portion 103 are divided by resiεtors 107a and 107b of the first voltage detecting portion 107 and supplied through a condenser 107c, a zener diode 107d and a resiεtor 107e to the inverting terminal of a comparator 107f. The output from the comparator 107f iε compared with the reference voltage εet by a variable reεiεtor 107g and reεiεtorε 107h and 107i. Alεo, the direct current εignals from the εecond three phaεe voltage inputting portion 106 are divided by reεiεtorε 109a and 109b and εupplied through a condenser 109c, a zener diode 109d and a resistor 109e to the inverting terminal of a comparator 109f. The output from the comparator 109f is compared with the reference voltage set by a variable reεiεtor 109g and resiεtorε 109h and 109i. Thuε, at the normal control εtate (when both voltages are applied to both lines with being opened), the outputs from the comparators 107f and 109f of the first and second voltage detecting portions 107 and 109 are made into the low level state. if the power failure happens at one line side, for example A-power source side, when the back up device performs the inεtantaneouε operation for removing the tranεient failure due to the line failure, The output £rom the comparator 107f becomeε high. The high level signal iε εupplied through a diode 107j and a reεiεtor 107k to the control logic portion 111. Alεo, when the B- power εource iε broken down, the output from the comparator 109f becomeε high. The high level signal is εupplied through a diode 109j and a resistor 109k to the control logic portion 111.

If any one of both line power sourceε iε broken down, any one of the outputs from the first voltage detecting portion 107 and the εecond voltage detecting portion 109 become high. If the output from the firεt voltage detecting portion 107 iε high, the voltage- divided εignal by the resistorε 107k and Ilia iε supplied through a condenεer 111b to one end of a NAND gate 111c aε well aε to one end of a NAND gate 11Id. While, the output from the comparator 109f iε maintained at the low εtate. The low level εignal iε εupplied through the reεiεtor llle and the condenεer lllf to one end of a NAND gate lllg aε well aε to the other end of the NAND gate Ilia. Thuε, the NAND gate 111c generates the high level εignal, and the NAND gate lllg alεo outputs the high level signal. The NAND gate llld combines the high level εignal of the NAND gate 111c with the high level εignal from the firεt voltage detecting portion 107 in a logic configuration to generate the low level εignal. The NAND gate lllh combineε the low level εignal of the NAND gate llld with the high level εignal of the NAND gate lllg in a logic configuration to output the high level εignal. Also, if the output of the comparator 107 iε low and the output of the comparator 109 iε high, the NAND gate 111c and the NAND gate lllg generate the high level εignalε, the NAND gate llld generates the low level εignal and the NAND gate lllh outputε the high level signal. Thus, if any one of the firεt and εecond voltage detecting portions 107 and 109 iε kept at the high level εignal εtate, the control logic portion 111 having an exclusive NOR configuration receives εignalε different from each other, so that the NAND gate lllh generateε the high level εignal to turn on the transiεtor 1111. Aε the transistor lllh iε turned on, its collector becomes low. The low level εignal iε applied through a reεiεtor 113a in the counting portion 113 to the base of a tranεiεtor 113b. The tranεiεtor 113b is turned off. As the tranεistor 113b iε turned off, itε collector made into the high level state. The high level εignal iε εupplied through a reεistor 113c to a condenser 113d. The condenεer 113d iε charged and then one pulεe εignal is supplied through a resistor 113e to a transiεtor 113f to turn on the tranεistor 113f. As the transiεtor 113f iε turned on/off according to the pulεe signal, the relay coil RS is turned on and then turned off. When the relay coil RS iε operated, a contacting point RSAl is turned on, and a contacting point REBl iε turned off. Thus, a relay coil RY1 is energized to turn on the contacting point RY1A1. While the contacting point RY1A2 iε turned on to apply the current through resiεtorε 113g and lllh to the baεe of the tranεiεtor llli. Upon the turning on of the tranεiεtor llli, the current iε by-paεεed through a contacting point RY1A2, a εelecting εwitch SW1 of a back up device and a reεiεtor 113j aε well aε the collector-emitter of the tranεistor 113i to the ground. Aε the tranεiεtor 113i iε turned on, itε collector becomeε low, and the current εignal iε not applied to a coupling condenεer 113k.

On the other hand, when the relay contacting point RSAl iε turned from the on-εtate into the off-εtate (at that time, the contacting point RSBl iε turned from the off-εtate into the on-εtate), the low level εignal iε applied to the baεe of the tranεiεtor 113i to turn off the transistor 113i. As the transiεtor 113i is turned off, the power εource voltage applied in εequence to a contacting point RY1A2, the εwitch SW1 and a reεistor 113j is supplied through a condenser 113k and a resistor 1131 to a transistor 113m. Aε the tranεiεtor 113m is turned on, a latch relay setting coil LR1/S of the couner reεetting portion 120 is operated, a contacting point LR1A1 iε turned on and the contacting point LR1B1 is turned off. Thus, unlesε the reεetting coil LRl/R is operated, it continues to be maintained at the set state and is prepared against next sequence to perform the once counting operation. As a reεult, the counting portion 113 memorizeε only once counting operation, and the εwitch 117 of the control εyεtem iε not opened.

Next, if the tie line automation control switch 117 iε under the twice power failure, it iε operated in the same manner as the once counting operation. Now, after the twice counting operation, the throw timing operation is proceeded as follows: Firstly, the relay coil RY2 is energized by the on-operation of the relay contacting point RSA2 and the off-operation of the contacting point RSBl in the counting portion 113, the contacting point RY2A2 is turned, and the high level εignal iε applied a reεistor 113n to the baεe of a tranεiεtor 113p. While the voltage εignal paεεing through a contacting point RY2A2 iε applied through a reεiεtor 113q to the collector of the tranεiεtor 113p. Aε the tranεistor 113p is turned on, a condenser 113r iε diεcharged. The contacting point RSA2 iε turned off, and the contacting point RSBl is turned on. Thuε, the low level biaε voltage iε applied to the reεistor 113n connected to the baεe of the tranεiεtor 113p, εo that the tranεiεtor 113p iε turned off. Aε the transistor 113p is turned off, its collector becomes high. The signal passing through the contacting point RY2A2 is applied through the resistor 113q and the condenser 113r to a resistor 113s, thereby turning on a transistor 113t. As the transiεtor 113t iε turned on, the latch relay εetting coil LR2/S iε operated while a tranεistor 120b is turned on by a resiεtor 120a of the counter reεetting portion 120. The turning on of the tranεiεtor 120b cauεeε the latch relay coil LRl/R to be operated, while the latch relay εetting coil LR2/S iε operated to turn off the contacting point LR2B2 of the throw timing portion 114, εo that the throw timing portion 114 iε operated. Simultaneously, the operation of the latch relay coil LRl/R in the counter resetting portion 120 causeε the once counting memory to be reset. Thus, upon the twice line power failure, the collector of a transistor 114a in the control logic portion 111 is made into the low level. The low level signal is applied to a resiεtor 114b on the base of the transistor 114a. The transiεtor 114a iε turned off, the collector of which outputε the high level εignal. The collector of the tranεiεtor 114a iε in the high level state, and the contacting point LR2/B2 iε turned off. Thuε, the high level εignal iε applied through a reεiεtor 114c and the baεe of a tranεiεtor 114d to a condenser 114e to be charged. Then, if the power failure of the line is maintained, the charged voltage at the resistor 114c and the condenser 114e iε εupplied through a reεiεtor 114f to the non-inverting terminal of a comparator 114g. Thus, the comparator 114g co pareε the inputted voltage with the reference voltage εet at the inverting inputting terminal. If the inputted voltage is higher than the reference voltage, the comparator 114g outputs the high level εignal to turn on a tranεistor 114i through a resiεtor 114h. The turning on of the tranεiεtor 114i causeε a relay coil RR4 to be operated. Thus, the voltage εignal passing through the auxiliary contacting points MB1 of the tie line automation control switch 117 is εupplied through a contacting point RR4A1 and a diode Dl to a throwing coil 116. The throw coil 116 iε operated. The tie line automation control εwitch 117 can be thrown in a reverεe-εupply manner.

While the εwitch 117 is thrown, the lock-out procedureε of the control function are aε followε: If the throwing operation is accomplished by the on-operation of the relay contacting point RR4A1 or the manual operation of the throwing εwitch portion 121, the voltage iε applied through a diode 118a of the lock-out outputting portion 118 to a reεiεtor 118b. A tranεiεtor 118c iε turned on to operate a relay coil RO. Thuε, the contacting point ROA1 of the latch operating portion 119 iε turned on, and a latch relay εetting coil LO/S iε operated. At that time, the contacting point LOB1 of the control power εource 110 iε turned off and the power εupply from the control power εource 110 to each control circuit is interrupted to paralyze all the control functions. The situation iε memorized until the latch relay resetting coil LO/R is operated to be reset by the resetting switch 124 of the latch operating portion 119. On the other hand, if the voltage is again applied during the proceeding of the twice timing operation and then the power failure happen at third times, the tie line automation control switch 117 iε operated in the same manner as the twice counting operation, and after the third counting operation the lock-out timing operation iε aε follows: If the voltage iε again thrown during the proceeding of the timing operation, the tranεiεtor 1111 of the control logic portion 111 is turned off, the collector of which becomeε high. Thuε, in the timing portion 114 the tranεiεtor 114a iε turned on through the reεiεtor 114b, the collector of which becomes high. The voltage of the condenεer 114e during being charged iε by-paεεed through a diode 114j and the collector-emitter of the transistor 114a to the ground. The comparator 114g outputε the low level εignal to turn off the tranεiεtor 114i. Thuε, the throw timing portion 114 is reset. The relay contacting point RR4A1 is opened, and unleεε the throwing switch 121 iε manually preεεed, the throwing coil 116 iε not operated. Furthermore, the switch 117 iε not opened and only the counting operation iε performed. At that time, if the power failure iε broken down at three timeε, the relay coil RY3 iε energized by the on- operation of the relay contacting point RSA3 and the off- operation of the contacting point RSB2 in the counting portion 113. At that time, the contacting point RY3A2 is turned on, and the high level signal is applied through a resiεtor 113u to turn on a transiεtor 113v. While the voltage εignal paεεing through a contacting point RY3A2 and a resiεtor 113w iε by-paεεed through the collector- emitter of the tranεiεtor 113v to the ground. Thuε, a coupling condenεer 113x iε diεcharged, the contacting point RSA3 iε turned off, the contacting point RSBl iε turned on and the tranεiεtor 113v iε turned off. Aε the tranεiεtor 113v iε turned off, itε collector becomeε high. The current iε flowed through the contacting point RY3A2, the reεistor 113w and a coupling condenser 113x. At that time the pulse signal iε applied through a reεiεtor 113y to a transistor 113z. The transiεtor 113z is turned on to turn on a latch relay setting coil LR2/R. The operation of a latch relay coil LS3/S causes the contacting point LR3B2 in the timing portion 115 to be turned off. If one εide power εource of the lineε counter is broken down, the transiεtor 1111 in the control logic portion 111 is turned on, the collector of which becomes high. Thus, a tranεistor 115b of the timing portion 115 iε turned off by a reεiεtor 115a, and the power voltage iε applied through a variable reεiεtor 115c and the base of a tranεiεtor 115d to a condenεer 115e. The condenεer 115e iε charged. After the predetermined time is elapεed, the discharging voltage of the condenser 115e iε applied through a diode 115f and a reεiεtor 115g to the non- inverting terminal of the comparator 115h. If the inputting voltage is higher than the reference voltage by reεiεtorε 115i and 115j, the comparator 115h outputs the high level εignalε. The high level εignal is applied through a diode 115k and the resiεtor 118b of the lock¬ out outputting portion 118 to the transistor 118c. As the transiεtor 118c is turned on, the relay coil RO is operated. Thuε, the contacting point ROA1 of the latch operating portion 119 iε turned on, and the latch relay εetting coil LO/S is operated. The operation of the latch relay εetting coil LO/S force the contacting point LOB1 of the control power source to be turned off. The power εource to each control circuit is interrupted, the control functions are paralyzed and the tie line automation control switch 117 is opened/locked out. The releasing of the locking-out is memorized until the resetting εwitch 124 iε turned on and the latch relay reεetting coil LO/R iε operated to be reεet aε deεcribed above.

If the line iε recovered into the normal εtate during the εequence control operation by the performance of the counting operation, for example the normal power εourceε on both lineε are exiεted, the reεetting procedureε of the counting operation are as follows: As both power sources are exiεted, the low level εignal iε applied to one endε of NAND gateε 111c, llld and lllg of a control logic portion 111 and the other end of the NAND gate 111c, εo that the NAND gate 111c outputε the high level εignalε to εupply it to the other end of the NAND gate llld. Thuε, the NAND gate llld outputε the high level εignal, and the NAND gate lllg also generates the high level signalε to apply it to both endε of the NAND gate lllh. The NAND gate lllh combineε two εignalε in a logic combination and outputε the low level εignal through the reεistor 111k to the base of the transiεtor 1111, but the transistor 1111 is turned off, to the collector of which the high level signal is applied through a reεiεtor 111m. Alεo, the high level εignal iε applied through the reεiεtor 112a of the counter reεet timing portion 112 to a transiεtor 112b. As the transiεtor 112b iε turned on, the tranεiεtor 112c connected at the collector of a tranεiεtor 112b iε turned off. Thus, the voltage on the collector of the transistor 112c and any one of the contacting points LR1B1, LR2B1 and LR3B1 of the counting portion 113 are maintained at the off-εtate. Thuε, the power εource iε connected through a variable resiεtor 112d of the counter reεet timing portion 112 to a condenεer 112f. The condenεer 112f iε charged by the power voltage, through the baεe of a tranεiεtor 112e. After the predetermined time is elapεed, the voltage diεcharged at the condenεer 112f iε provided through a diode 112g and a reεistor 112h to the non-inverting terminal of a comparator 112i. If the inputting voltage iε higher than the reference voltage, the comparator 112i outputε the high level εignal to apply it through a reεiεtor 112j to a tranεiεtor 112k. Aε the tranεiεtor 112k iε turned on, the relay coil is operated. At that time, the contacting point RR3A1 of the counter reεetting portion 120 iε turned on, the latch relay coils LRl/R, LR2/R and LR3/R are εimultaneously operated and all pointε RSAl, RSA2, RSA3, RY1A1, RY2A1, RY3A1, RY1A2, RY2A2, RY3A2, LR1A1, LR2A1, LR1B1, LR2B1, LR3B1 and RSBl of the counting portion 113 are reεet to return to the normal control state. Alεo, the counter reεetting operation is that when the relay coil RO of the lock-out outputting portion 118 is operated the contacting point ROA2 of the counter reεetting portion 120 iε turned on, and thuε the reεetting coilε LRl/R, LR2/R and LR3/R are operated to reεet the counting portion 113 aε deεcribed above.

Fig. 9 is a schematically block diagram illustrating the configuration of a power distribution line automation control εection εwitching εyεtem. The current flowing through a line iε tranεformed in a predetermined ratio by a current tranεformer 31 to be inputted to a three phase/ground inputting portion 32. The current signal rectified at the three phase/ground inputting portion 32 iε converted into the appropriate level voltage to be inputted to the current detecting portion 33 aε a control εignal in proportion to the line current. Alεo, the current iε inputted directly or through a three phaεe both voltages inputting portion 38 into a transformer 35 on the line of the power source and a transformer 37 on the load line. The inputted current is transformed and εupplied to a control power εource portion 39 to be used aε the control voltage, or εupplied to a voltage detecting portion 40 to generate the εignal according to the voltage detection. The εignalε reεulting from the current detection portion 33 and the voltage detecting portion 40 are inputted into a microprocessor 41 including a CPU, a timer, an interrupt controller, a decoder and an A/D converter to control all operation of a system according to information such as a current, a voltage, a phaεe etc.

The icroproceεεor 41 εtoreε information and data neceεsary for a memory 42, a ROM 42a memorizes the program and the fixed data for the control of the system, an EEPROM 42b stores a εtate information and a check information upon the operation of the control system and a SRAM 42c storeε information occurred during the operating for a moment. A diεplay portion 43 controlled by the microproceεεor 41 iε a LCD (Liquid Cryεtal Display) to mainly represent three phase current information as well aε to selectively display the voltage, the ground current and information selected and inputted by userε. A communication module 44 convertε the digital information from the microproceεεor 41 into the modem information to tranεfer it to a remote controller (not shown), otherwise the inputted information into the digital serieε information to tranεfer it to the microproceεsor 41, thereby enabling the remote communication.

If the opening signal or the throwing signal from the microprocessor 41 is supplied through an inputting/outputting portion 45 to an opening operation portion 46 or a throwing operation portion 47, a trip coil 48 or a throwing coil 49 is selectively operated to open or throw a switch 50. The opening or throwing state signal of the switch 50 is inputted through the inputting/outputting portion 45 into the microprocessor 41 by a contacting point 51. A user can input the selecting specification by a key inputting portion 52 in order to change the setting value or identify the state. Aε deεcribed above, a power diεtribution line automation control section switching system according to the invention enables the microprocessor 41 to receive data such as a line current, a line voltage on the power source, a line voltage on the load, a phase comparison result of the voltage on the power εource and the voltage on the load, etc. The microproceεεor 41 converts the data into the digital information and then judgeε the εtate of the line εwitch baεed on the program of the memory 42 to control the system.

Fig. 10 is a flow chart illustrating a method for operating a power diεtribution line automation control εection εwitching εyεtem. The power εource iε applied to the syεtem at step 200. At εtep 201, it iε determined whether the line εwitch iε εet aε a εection εwitch or a tie switch. Step 201 goeε on εtep 202 to set the εtate of the control εyεtem and operate the control syεtem at the state that the switch iε εet aε it iε independent of the εection εwitch or the tie εwitch. Next, the control iε proceeded to step 203 that the microprocessor 41 reads/initializeε the results which the contacting state of the εwitch 51 (the opening, the throwing and the gaε preεεure εtate) iε checked by the contacting point 52. Step 203 proceeds on step 204 that the microprocesεor 41 initializeε the control εystem. The microprocesεor 41 identifieε the elapse of the predetermined time and performε the real time control interrupt for checking a conεtant period at εtep 205. If the predetermined time iε elapsed and a fixed time is reached, the microprocessor 41 receives the three phase/ground current inputting data from the current detecting portion 33 and the line voltage data from the voltage detecting portion 40 at εtep 206. Next, the communication interrupt state is checked in order to receive the εelecting εpecification by remote controller at step 207. If the communication mode iε not interrupted, the existence of the selecting εpecification by local mode is identified at step 208. The εtate control operation of the εwitch 50 is performed according to the inputted information, while the display 43 showε the inputted information only in case of the existence of the selecting specification at step 209. The phase computing procedures based on the inputted voltage information is repeated at step 210.

Fig. 11 is a flow chart showing the performing of the real time interrupt control mode. The microprocessor 41 sets the interrupt time at step 211, controls the time data and flags at step 212, reads the current information and the voltage information every fixed time of a constant period that the predetermined time is elapsed, controls their memorizing operation of the system and performs the control operation of the display 43 to maintain the diεplaying data for a predetermined time period at step 213, and controls the timer and terminates the real time interrupt operation at εtep 214.

Fig. 12 εhowε procedureε for controlling the inputting/ outputting of data to perform the remote control by the communication interrupt. The microproceεεor 41 identifieε the poεεibility of transferring interrupt state at εtep 220, setε the control flag for the tranεferring at εtep 221 if the tranεferring mode iε interrupted, normally performε the outputting of data through the communication module 44 to the remote controller by the control flag for tranεferring at εtep 222, identifieε the posεibility of the receiving interrupt εtate if the tranεferring mode is not interrupted or the transferring operation is normally performed at step 223, reads/εtores the inputting data of the selecting specification received from the communication module 44 at εtep 224 if the receiving mode is interrupted, and performε the εetting operation of the control flag for receiving at step 225.

Figs. 13a, 13b and 14 show the control operation of the control

system, in which Fig. 13a and 13b are the flow charts showing a method for controlling the operation of the εection line control εystem, and Fig. 14 is a flow chart showing a method for controlling the operation of the tie line control system. The system controls a switch in a complex manner to adapt information periodically read by the syεtem to the state changes (voltageε εtate - non-voltage εtate, the non-voltage state - the voltage state, normal current εtate - failure current εtate, failure current εtate - normal current current state and the relationship between the state changed time and the set time) after determining the failure in the front of or at the latter of the line switch. In caεe that uεerε εet a εwitch aε a εection by the remote or local mode at εtep 230, the control εyεtem is set as the section at the state at εtep 231. Next, the possibility of the non-voltage state is checked at step 232. It is determined at step 233 whether the inputting signal requesting for the opening by users is existed in case that there is not the non-voltage state. If the opening signal is not requested, the system is made into the normal state as the section. Thus, the εyεtem is maintained at the present state and returns to the initial operation at step 234. If the opening demand εignal iε exiεted, the opening εignal iε applied through the inputting/outputting portion 45 to the opening operation portion 46, εo that the trip coil 48 opens the εwitch 50 to be under the open-to-lockout at step 235. If the non-voltage iε checked at εtep 232, it iε determined at step 236 whether the inputting εignal for the opening iε required. If the opening demand εignal iε exiεted, step 236 returns to step 235, and if the opening demand signal is not existed, the voltage from the voltage detecting portion 40 is detected at step 237. If the voltage is not detected, it is determined as first non- voltage εtate at step 238. If the voltage is detected, the returning timer is set, and the voltage state is monitored at step 239. Next, it is determined at step 240 whether the opening demand εignal iε exiεted by uεerε. If the opening demand εignal iε exiεted, εtep 240 returns to the initial operation. If the opening demand εignal iε not exiεted, it iε determined at εtep 241 whether the counting of the returning timer iε terminated. If the counting of the returning timer iε terminated, it iε judged that the failure is removed, εtep 241 returns to the initial operation in order to maintain the εyεtem at the normal state. If the counting of the returning timer is not terminated, it is determined at step 242 and step 243 whether the twice non-voltage is detected until the counting of the timer is terminated. If the twice non- voltage is detected, it means that the failure is not yet removed, whereby the opening signal is outputted to open the switch 50, and at step 244 the switch is again thrown by its own sequence.

Sequentially, at the temporary opening state that the switch 50 is opened by the opening demand signal, it is determined at step 245 whether the voltage iε detected. If the voltage detecting portion 40 detects the voltage, the εection throwing check εtate iε made at step 246, by which the throw timer is εet/diεplayed by the throwing time data in order to identify the possibility of the section failure. At the section throwing check state, it is determined at step 247 whether the throwing timer is elapsed. If the voltage continues to be detected during the throwing timer being terminated at step 247, assuming that there iε not the failure in front of the εwitch, the throwing signal is applied through the inputting/outputting portion 45 to the throw operating portion 48. Thus, the εwitch is thrown by the throwing coil 49, and then the back failure check state is made at step 250, by which the back timer is set/displayed to identify the back failure (herein, if the switch is thrown, it must be determined whether there is the power εource on the load to prevent the collision of the both power source) .

If the throwing timer is not terminated at step 247, the posεibility of the non-voltage detection iε checked at εtep 251 until the timer iε terminated. If the throwing timer iε terminated, the front timer is εet to identify the front failure at step 252. It is determined at step 253 whether the front timer is out of order to identify the front failure. If the front timer is out of order, asεuming that the failure in front of the timer happen, the εwitch 50 iε opened to be in the lock-out- at-open εtate at εtep 254. Before the timer iε out of order, it iε determined at εtep 255 whether the voltage is detected. If the voltage is detected, the εection throwing check εtate iε made to return to step 246. It is identified at εtep 249 that there iε not the front failure. It iε determined at step 256 whether the back timer is out of order during the identifying of the rear failure. If the timer iε out of order, aεεuming that there iε not a failure in the rear εide, the εystem is converted into the εection normal state as well as returns to the initial operation, while it is determined at step 257 whether the non-voltage is detected. If the non-voltage is detected, it is again determined at step 258 whether the failure current is detected. If the failure current iε detected during the operation of the timer, the current iε applied through the inputting/outputting portion 45 to the opening operation portion 46. The opening operation portion 46 is operated to force the trip coil 48 to open the switch 50, so that the switch 50 is made into the open-to-lock-out state.

On the other hand, if the switch 50 is locked out at the opening state of step 254 and if the switch 50 is opened and locked out at step 259, it is identified by users at step 260 whether the throwing εignal is inputted. If the throwing εignal is inputted, it iε converted into the εection normal state and the syεtem returnε to the initial operation. Fig. 14 εhowε the operation procedureε of the εtate that the line εwitch of the invention is εet aε a tie. At the normal εtate that the εwitch 50 iε opened, it is determined at step 261 whether the throwing signal is inputted by uεers. If the throwing εignal iε inputted, the phaεe iε identified at step 262 with the phase information calculated by the line voltage information. In caεe of the εame phaεe, the throwing coil 49 is operated by the εignal from the throw operating portion 47 to throw the εwitch 50, the εwitch 50 is converted into the close-to-lock-out state at step 263. If the throwing signal is not existed at step 261, it is determined at step 264 whether the non-voltage is detected. If the non-voltage iε not detected, even though the throwing εignal is a defect phaεe different from the normal phaεe with being inputted, the normal tie εtate iε maintained aε if the throwing signal iε ignored and the εyεtem returnε to the initial operation. If the non-voltage is detected at εtep 264, it iε determined at step 265 whether the voltage from the voltage detecting portion 40 iε detected. If the voltage iε not detected, it is judged as the non-voltage state, if the voltage is detected, the returning timer is operated to convert the εystem into the tie returning identification state recognizing the voltage for the predetermined displaying time at step 266.

On the other hand, it is determined at step 267 whether the returning timer is completed. If the returning timer is completed, the normal tie state is maintained and the system returns to the initial operation, if the returning timer is not completed, it is determined whether the non-voltage is deteteted at step 268. If the non-voltage is detected, the throwing timer is operated to be made into the tie throwing identification state at step 269., It is determined at step 270 with the tie throwing being identified whether the timer is completed. If the timer is finished, the throwing signal is applied through the inputting/outputting portion 45 to the throw operating portion 47. The switch 50 iε thrown by the throwing coil 49 to be made into the tie cloεe-to-lock-out εtate at εtep 271. If the timer iε not completed, it iε determined at εtep 272 whether the voltage iε detected by the voltage detecting portion 40. If the voltage iε detected, aεεuming that the front failure occurs, the front timer is set at step 273, and the operation of the throwing timer εtops to be converted into the tie front failure identification εtate for the front failure identification at εtep 274.

It iε determined at εtep 275 whether the front timer is out of order. If the front timer iε out of order, the normal tie εtate iε εet at εtep 273, and the εystem returns to the initial operation state. If the front timer is not out of order, it is determined at εtep 276 whether the non-voltage is detected. If the non-voltage iε detected, aεεuming that the front failure occurε, the switch 50 is locked out to be made into the lock-out-at- open εtate with being not thrown. It is determined at εtep 277 whether the reεetting εignal iε inputted by uεers. Only if the reεetting signal is inputted, the control flag data of the control syεtem iε cleared to be converted into the normal tie state at step 278. The switch is thrown at steps 263 and 271, and thus it is determined at step 279 whether the opening signal is inputted by users with being locked out. Only if the opening signal is inputted, the switch 50 is opened at step 280 to be made into the normal state.

As deεcribed above, the power diεtribution line εwitch method and the power diεtribution line εwitch control εystem according to the invention co-operate with a recloser or a circuit breaker of a back up device, divides the εection into parts at maximum even in any line operation manner, εimplifieε the correction and facilitateε its use. Alεo, the unneceεεary power failure and operation are not repeated, and the good εervice will be expected by the economic and rapid line recovery.

Industrial Applicability

The invention provideε the enhanced co-operation capability for removing the tranεient failure and methods for resolving problems of the algorithm processing of a line εwitch control which appearε aε diεadvantage of a power line carrier εyεtem for a power diεtribution automation, by which only the failure section is divided into parts and the recovery of the good line is automatically resolved.

In particular, it has advantages in that the switch εtate iε remote-controlled to exactly identify the operation state of a system and the use of the microprocessor enables the record and keeping according to the communication and the operation state.

Claims

1. A radial power diεtribution line automation εwitching method compriεing stepε of: co-operating for removing the transient failure independent of the instantaneouε reclosing time of a back up device; opening/locking out only the εwitch of the failure εection to εeparate the permanent failure εection from the good εectionε without the unnecessary operation of forcing the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the switch in the good εection.

2. A branch power distribution line automation εwitching syεtem compriεing εtepε of: co-operating for removing the transient failure independent of the inεtantaneouε reclosing time of the back up device; opening/locking out only the switch of the failure section to separate the permanent failure section from a good section without the unnecesεary operationε which forceε the good εection εwitch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the εwitch in the good section; and determining the failure line by which only the switch of the failure section opened/locked out to separate the permanent failure εection from a good section while the switch of the other branch line is not again opened without the unnecesεary operations which forceε the good εection εwitch of the other branch line to be again opened and thrown when the branch line in the failure εection iε removed in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the εwitch in the good section.

3. A loop power diεtribution line automation εwitching system comprising stepε of: co-operating for removing the tranεient failure independent of the inεtantaneouε recloεing time of the back up device; opening/locking out only the εwitch of the failure section to εeparate the permanent failure εection from a good εection without the unneceεεary operationε which forceε the good εection εwitch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the εwitch in the good εection; determining the throwing poεεibility of the failure line at the time of the reverεe-εupply, in which the automatic reverse-supply iε not thrown if the section directly combined with the normal opened εwitch is broken down, and only the failure section is automatically εeparated if the other line section is broken down; and maintaining the normal control function of the section switch in the good line thrown to reverse-supply the power, thereby establiεhing the line protection co¬ operation after the reverεe-εupplying of the power.

4. A complex power diεtribution line automation εwitching εystem compriεing εtepε of: co-operating for removing the tranεient failure independent of the instantaneous reclosing time of the back up device; opening/locking out only the switch of the failure section to separate the permanent failure section from a good section without the unneceεεary operationε which forceε the good εection εwitch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure and preventing the re-opening of the εwitch in the good section; determining the failure line, by which only the switch of the failure εection iε opened/locked out to εeparate the permanent failure εection from a good section without the unnecessary operationε which forces the good section switch to be again opened and thrown in the procedure of the identification throw during the removing of the permanent failure, and the re-opening of the εwitch in the good εection iε prevented; determining the throwing poεεibility of the failure line at the time of the reverεe-εupply, in which the automatic reverεe-εupply iε not thrown if the section directly combined with the normal opened εwitch is broken down, and only the failure εection iε automatically εeparated if the other line section is broken down; maintaining the normal control function of the section switch in the good line thrown to reverse-εupply the power, thereby eεtabliεhing the line protection co¬ operation after the reverεe-supplying of the power; and preventing the throwing of the failure section, when the power sourceε on both endε of the section switch are existed during the reverse-εupplying of the power, whereby the automatic εwitch control operation iε performed for the co-operation of the line protection.

5. A power diεtribution line automation εection εwitch control εyεtem compriεing: a voltage and current reεtraining means for detecting/ controlling the voltage and current of a line;

a failure detecting meanε for detecting the failure current of a line; a counting meanε for performing only once counting operation and then being reεet into the normal εtate with being opened, when the power εource iε broken down after the removing of the transient failure and then the successful throwing of a εwitch; a counter reεetting meanε for reεetting the counting number stored during the counting after the recovery of the normal εtate; a ruεh current reεtraining meanε for preparing against the ruεh current when the normal line iε thrown; a counting/opening meanε not to open/lock-out a switch as εoon aε the correction of the counting coefficient is completed; an automatic throw reεtraining meanε for detecting the voltageε of both εideε of a line and preventing the throwing if both voltageε are exiεted at the opening εtate; a sequence timing throw meanε for throwing the power after the throw timing elapse, if the power voltage iε again applied during opening after the counting operation; an once opening/locking-out means for preventing the opening at the detection of the normal current and for opening only one time and locking out at the detection of the failure current, when the power source is broken down during the proceeding of the lock-out timing after the throwing; an opening/locking-out means for not proceeding on the lock-out operation, immediately, if the non-voltage state iε kept after the counting opening and for proceeding on the lock-out operation after the timing counting with being opened, if the power voltage is applied one time and then the non-voltage is maintained during the throw timing; and, a non-operation timing means not to perform the once opening operation even through the normal line is in the power failure during the sequence co-operation of the line after being thrown and the completion of the lock¬ out timing when a circuit breaker is co-operated by means of a selecting switch.

6. The power distribution line automation section switch control syεtem according to Claim 5, in which: said voltage and current restraining means includes a voltage/ current restraining portion for combining the voltage signal from a voltage detecting portion with the current signal from a phase/ground current detecting portion in an OR logic configuration and controlling the operation of a ruεh current reεtraining portion, an once opening portion and a counter portion dependent on the non-existence and/or exiεtence of the line voltage and current.

7. The power diεtribution line automation section switch control syεtem according to Claim 5, in which: εaid failure detecting meanε includes a phaεe/ground failure current detecting portion fpr charging the voltage εignal in proportion to the failure current of the line therein, restraining the operation of said voltage/current reεtraining portion and operating an once opening portion upon the power failure of the line.

8. The power diεtribution line automation εection switch control εyεtem according to Claim 5, in which: εaid counting means includes a counting portion for releaεing the εignal from εaid voltage/current restraining portion upon the power failure of the line, receiving the εtored-energy εource εignal from an auxiliary contacting point and performing only once counting operation.

9. The power diεtribution line automation section switch control syεtem according to Claim 5, in which: εaid counting/opening meanε includes an opening operation portion for operating a trip coil and opening a εwitch after the completion of the counting operation by the twice output from a trip outputting portion if the power source iε twice broken down upon the line recovery of the power failure.

10. The power distribution line automation section switch control εyεtem according to Claim 5, in which: said counter resetting means includes a counter reεet timing portion for receiving the on-voltage from εaid voltage detecting portion and the control power applied through an auxiliary contacting point and enabling an opening operation portion to reεet a counter reset timing portion.

11. The power distribution line automation section switch control syεtem according to Claim 5, in which: said rush current restraining includes a rush current restraining portion for receiving the output from said voltage/current reεtraining portion and providing the latch εignal to εaid phase/ground failure current detecting portion if the power failure happens under the normal state of the line, thereby paralyzing the detecting function of the failure current, restraining the current detection for a constant time period, performing the restraining function to the rush current.

12. The power distribution line automation section switch control εyεtem according to Claim 5, in which: εaid automatic throw restraining means includeε a throw timing portion for being operated by the output detected by a three phaεe line both voltages inputting portion and restraining its output if the voltages on both lines are existed together after the completion of the counting operation and a throw operating portion inter-locked by said three phase line both voltages inputting portion.

13. The power distribution line automation section switch control system according to Claim 5, in which: said sequence timing throw meanε includes a throw coil for being operated and throwing εaid εwitch when the throwing εignal iε εupplied to εaid throw operating portion during the proceeding of the throw timing by εaid throw timing portion.

14. The power diεtribution line automation εection εwitch control εystem according to Claim 5, in which: said opening/locking-out meanε includeε an opening operation portion opened and reεet by a manual operating εwitch and a lock-out outputting portion for receiving the εignal from said opening operation portion and turning out a control circuit operating portion.

15. The power diεtribution line automation section switch control system according to Claim 5, in which: εaid once opening/locking-out meanε includeε a lock¬ out timing portion for restraining said voltage/current restraining portion by the failure current charged at εaid phaεe/ground failure current detecting portion, when the power failure happens during the proceeding of the lock-out timing and for operating said once opening portion by the failure current detecting delay signal charged at said phase/ground failure current detecting portion.

16. The power diεtribution line automation εection εwitch control system according to Claim 5, in which: said non-operation timing meanε includeε a non- operation timing portion for restraining the operation of said counting portion and said once opening portion.

17. A tie power distribution line automation switch control syεtem compriεing: a counting means for the sequence co-operation in removing the tranεient failure of a back up device; an automatic throwing meanε for being thrown and then controlling the εequence and timing εo as to recover a good section after the completion of the throw timing if the power breakdown of any one line is maintained following by once counting corresponding the circuit breaker or twice counting corresponding to a recloser under the co-operation of the back up device; an opening/locking out means for being thrown and then controlling the sequence and timing so as to prevent the automatic throwing of a failure εection with being opened/locked out after the completion of the timing due to it that the lock-out timing iε proceeded and the power failure iε maintained, if the power εource is again broken down before the broken-down voltage is recovered and then reset in the εequence manner during the proceeding of the throw timing; and a sequence resetting means for returning from the opening state to the normal εtate after the completion of the resetting timing, when one voltage iε recovered.

18. The tie power distribution line automation switch control system according to Claim 17 in which: said automatic throwing meanε for performing once counting operation and controlling the sequence and timing to recover the good section with being thrown after the completion of the throw timing when the power failure is maintained on one line, in case that back up device is a circuit breaker.

19. The tie power distribution line automation switch control system according to Claim 6 in which: said automatic throw operating means for performing twice counting operation and controlling the sequence and timing to recover the good section with being thrown after the completion of the throw timing when the power failure is maintained on one line, in case that back up device is a recloser.

20. A power distribution line automation switch control syεtem compriεing: a microproceεεor for receiving the detecting results from a current tranεformer, a current detection portion connected to a tranεformer on the power source and a voltage detecting portion connected to a tranεformer on the load to control all operation of a system and including a CPU, a timer, an interrupt controller, a decoder and an A/D converter; a memory for εtoring the information and data of εaid microproceεεor including a ROM, an EEPROM and SRAM; a diεplay portion in the form of a LCD for representing information of currents, voltageε, ground currents and information inputted by the εelection of uεerε according to the control of εaid microproceεεor; a communication module for converting the inputted modem information into the digital series information, or the digital information from the microproceεεor into the modem information; and, an inputting/outputting portion for εupplying the opening εignal and the throwing εignal from said microprocesεor to an opening operation portion and a throw operating portion while supplying the state signal from a contacting point to said microprocesεor.

21. A power diεtribution line automation switch control method comprising steps of: determining whether the line εwitch iε εet aε a εection switch or a tie switch; reading/initializing the contacting state of a switch to be operated at the setting state; performing the real time control interrupt for checking a constant time period and computing a three phase, a ground current, a line voltage and a the phase difference in the line voltage; displaying the selecting εpecification by remote or local mode through a diεplay, portion; and controlling a εwitch according to the inputted information.

22..The power distribution line automation switch control method according to Claim 21, in which: the real time interrupt control mode includes steps of: setting the interrupt time of a conεtant period; controlling the time data and flagε and determining whether it iε a fixed time of a conεtant period; and reading the current information and the current information within the fixed time and diεplaying them on a diεplay.

23. The power distribution line automation switch control method according to Claim 21, in which: a communication interrupt mode includes stepε of: identifying the possibility of the transferring interrupt state; setting the control flag for the transferring if the tranεferring mode is interrupted and performing the outputting of data thereto; identifying the poεεibility of the receiving interrupt εtate if the transferring mode iε terminated or the receiving εignal iε not transferring interrupt; and, reading the inputting data from the communication module, if the receiving mode is interrupted and then setting the control flag.

24. A power distribution line automation switch control method including a line switch being set as a section use, comprising steps of: determining whether the opening demand input is exiεted or there is the non-voltage εtate at the normal εtate; returning to the normal εtate if the opening iε not requeεted and opening the εwitch to be made into the open-to-lockout εtate if the opening iε requested; opening the εwitch if the opening demand inputting iε exiεted under the non-voltage and detecting the voltage to be made into first non-voltage εtate; determining whether the opening demand signal iε inputted, during the setting/displaying of a returning timing if the voltage iε detected under the non-voltage; returning to the normal state that the failure is removed, if the opening iε not demanded until the returning timer is terminated; determining whether twice non-voltage iε detected until the returning timer iε terminated and opening at the temporary opening εtate that the switch iε opened if the non-voltage is detected; εetting the throw timing if the voltage iε detected at the temporary opening εtate and being converted into the εection throwing check εtate for identifying the poεεibility of the front failure; throwing the switch if the voltage iε detected while the throw timer iε terminated at the εection throwing check state; setting a back up timer to be under the check εtate of the back failure; setting the front timer if the non-voltage iε detected before the termination of the throw timer to be made into the lock-out-to-open εtate to identify the front failure; returning to the normal εtate if the back timer iε out of order at the check εtate of the back failure; determining the posεibility of the failure current if the non-voltage iε detected during the operation of the back timer to be made into the lock-out-to opening state for the locking out; and returning to the εection normal εtate if the throw demand iε exiεted by uεerε at the opening state of the lock-out and the opening εtate for the lock-out.

25. A power diεtribution line automation switch control method including a tie εwitch, compriεing εtepε of: determining whether the throwing εignal iε inputted by users, identifying the phase if the throwing signal is inputted and being converted into the cloεe-to-lock-out εtate; determining whether the non-voltage is detected, If the throwing εignal iε not existed and the non-voltage iε not detected; operating the returning timer if the voltage iε detected; converting the throw timer into the normal tie εtate if the non-voltage is not detected and operating the throw timer to converted into the tie throw identification εtate if the non-voltage iε detected; throwing the switch if the voltage iε not detected until the throw timer iε terminated at the tie throw identification εtate and returning to the throw state for the tie lock-our; operating the front timer if the voltage is detected during the operation of the timer to be converted into the tie front failure identification state for stopping the throw timer; returning to the lock-out-to-opening state if the non-voltage is detected during the breaking down of the from timer; returning to the normal tie state after the opening of the switch at the opening state for the tie lock-out; and, returning to the normal tie state after the control flag data iε cleared if the reεet signal is inputted at the lock-out opening state.