WO1995007569A1 - Power distribution line switching method and control system therefor - Google Patents
Power distribution line switching method and control system therefor Download PDFInfo
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- WO1995007569A1 WO1995007569A1 PCT/KR1994/000119 KR9400119W WO9507569A1 WO 1995007569 A1 WO1995007569 A1 WO 1995007569A1 KR 9400119 W KR9400119 W KR 9400119W WO 9507569 A1 WO9507569 A1 WO 9507569A1
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- failure
- voltage
- line
- opening
- power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
Definitions
- 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.
- 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.
- 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
- 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
- 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.
- 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.
- a section switch such as a reclosing section switch co-operating with a circuit breaker or a recloser, which is the back up device
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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 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.
- 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.
- Tie Feed Automatic Switch tie power distribution line automation switching system
- 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.
- 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.
- 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.
- 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.
- the loop power distribution line automation switching system 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.
- 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.
- 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.
- 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
- 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.
- 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.
- 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.
- the recloser REC41 is thrown, again.
- the section switches SW41— SW42 are thrown, and the section switches SW45 and SW46 are thrown in sequence.
- the tie switch TS47 is connected to the power source A during the throwing timing period.
- 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.
- 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/
- 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
- 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.
- 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.
- 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.
- 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 ⁇ tored-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 ⁇ tored- energy power necessary for the control system of the invention to be secured.
- 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.
- 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 ⁇ tored-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.
- the voltage signal from the voltage detecting portion 12 receives a signal which combines the current ⁇ ignal from the phase/ground current detecting portion 2 with the voltage ⁇ ignal from a three pha ⁇ e line both voltage ⁇ 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 re ⁇ training 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 ⁇ upplie ⁇ 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 ⁇ ource 24 is turned off by a lock-out outputting portion 25 and turned on by the re ⁇ et 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 ⁇ upplies 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.
- the auxiliary contacting portion 23 supplies the power from the constant voltage ⁇ tored-energy power source 3 to a non-operation timing portion 26 and al ⁇ o the control power from the control circuit power source 24 to the counter re ⁇ et timing portion 18 and the counting portion 20.
- the auxiliary contacting portion 23 ⁇ upplies the control power from the control circuit power source 24 to an on-voltage detecting memory portion 15 and the throw timing portion 13.
- 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.
- the counting portion 20 performs the once counting operation according to the ⁇ election 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).
- 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 supplie ⁇ the re ⁇ et ⁇ ignal 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 operate ⁇ 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 ⁇ y ⁇ tem adapted to the invention return ⁇ to the original normal control ⁇ tate.
- the voltage/current restraining portion 7 stops outputting the signal, which restrains the set operation of the ru ⁇ h current re ⁇ training portion 6 when the counting operation i ⁇ 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 ⁇ y ⁇ tem.
- the rush current restraining portion 6 performs the set operation by the two constant voltage stored- energy power pa ⁇ sing through the control circuit power ⁇ ource 24. It enable ⁇ the latch ⁇ ignal 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.
- the ⁇ witch of a switch control apparatu ⁇ according to the invention i ⁇ thrown and then restrain ⁇ the current detection for a predetermined time period, thereby performing the re ⁇ training function to the ru ⁇ h current.
- the voltage/current restraining portion 7 ⁇ top ⁇ outputting the ⁇ ignal, which re ⁇ train ⁇ the ⁇ et operation of the ru ⁇ h current re ⁇ training portion 6 when the counting operation i ⁇ performed or the counting opening operation i ⁇ performed, if the line i ⁇ made into the power failure at the failure current ⁇ tate.
- the ru ⁇ h 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.
- the procedures of performing the automatic throwing operation of the line automation control ⁇ ection ⁇ witching ⁇ y ⁇ tem opened after the completion of the counting because of the permanent failure of the line are as follows:
- the line automation control section ⁇ witching ⁇ ystem 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 i ⁇ 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.
- the line automation control ⁇ ection 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 i ⁇ blocked becau ⁇ e of the re ⁇ et operation of the throwing operation portion 14, and the pul ⁇ e generation of the counting portion 20 is blocked.
- the lock-out timing portion 16 perform ⁇ the lock-out timing by the on-voltage output.
- the voltage ⁇ ignal in proportion to the line failure current from the phase/ground current detecting portion 2 is inputted into the pha ⁇ e/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 i ⁇ restrained by the voltage/current re ⁇ training portion 7.
- the output of the once opening portion 19 operates the lock-out outputting portion 25 to turn off the control circuit power ⁇ ource 24, thereby the line automation control section switching sy ⁇ tem being locked out ( ⁇ topping the operation of the control function).
- the switch of the invention enable ⁇ the failure ⁇ ection not to be automatically thrown even through the line i ⁇ recovered to be under the applying of on-voltage when the power ⁇ ource i ⁇ broken down after the failure current detection during the proceeding of the lock-out timing.
- the line automation control ⁇ ection ⁇ witching ⁇ y ⁇ tem i ⁇ opened and the counter i ⁇ reset by the switch of the opening operation portion 21 (not shown) (referring to Fig. 6) at the time of the manual opening operation.
- 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 sy ⁇ tem being opened/ locked out.
- 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.
- 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 ⁇ ignal, and the once opening portion 19 can not be operated.
- the counting or opening operation i ⁇ not performed even through the power ⁇ ource i ⁇ 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.
- the line automation control section switch in a good ⁇ ection, which completed the lock-out timing with being thrown on the way to proceed the line ⁇ equence in the procedure of the identification throw at the line failure, i ⁇ not again opened, even if the power ⁇ ource i ⁇ broken down.
- 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.
- 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.
- the failure section is removed, and the normal state is recovered by the reclosing of the recloser, whereby the line automation control section ⁇ witch i ⁇ re ⁇ et in a counter re ⁇ et manner to return to the original ⁇ tate.
- the line automation control ⁇ ection ⁇ witch selectively use ⁇ it ⁇ 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 ⁇ ection ⁇ witch performs the non-operation sequence.
- the line automation control ⁇ ection ⁇ witch in a good ⁇ ection enable ⁇ the once opening portion 19 and the counting portion 20 not to be operated a ⁇ well a ⁇ doe ⁇ not perform ⁇ the counting and opening operation ⁇ .
- the non-operation timing portion 26 i ⁇ eclectically connected through the auxiliary contacting portion 23 to the con ⁇ tant voltage ⁇ tored-energy power ⁇ ource 3, ⁇ o that the operating (charged) power i ⁇ applied thereto.
- the output from the non-operation timing portion 26 turn ⁇ on the counting portion 20 to make the line automation control ⁇ ection ⁇ witch return to the normal ⁇ tate.
- 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 i ⁇ thrown in the procedure of the identification throw of the line, the throw timing i ⁇ begun with respect to the line automation control ⁇ ection ⁇ witch behind the failure ⁇ ection.
- the throw timing portion 13 i ⁇ 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.
- the line automation control section switch in the failure section is opened/locked out, and the line automation control section switch behind the failure ⁇ ection provides the predetermined signal with the lock-out outputting portion 25 after the completing of the non-voltage lock-out timing.
- 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 ⁇ witching ⁇ y ⁇ tem, ⁇ o that the line automation control ⁇ ection ⁇ witch behind the failure ⁇ ection is opened/locked out (into the permanent opening state).
- the line automation control section switch is not opened even if the voltage is applied thereto in a rever ⁇ e- ⁇ upply manner, and only the line automation control ⁇ ection ⁇ witch on both end ⁇ of the failure ⁇ ection line i ⁇ permanently opened.
- Fig. 6a and 6b are the detailed circuits of a power distribution line automation control section switching system as ⁇ hown 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 ⁇ A, B and ⁇ C.
- 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 i ⁇ 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 current ⁇ ignal applied to the con ⁇ tant voltage ⁇ tored-energy power source 3 i ⁇ combined in an OR logic configuration with the voltage ⁇ ignal from a three pha ⁇ e line both voltage ⁇ inputting portion 4 passing through a voltage regulator diode 3a, while it is applied in sequence to the emitter and corrector of a power transi ⁇ tor 3b and then i ⁇ connected to the minu ⁇ (negative) ⁇ ide of the rectifying circuit of the pha ⁇ e/ground current detecting portion 2.
- the base of the power transi ⁇ tor 3b is maintained at the constant voltage by a zener diode 3c, and its emitter is provided with conden ⁇ ers 3d and 3e, ⁇ o that the con ⁇ tant voltage i ⁇ charged.
- the current pa ⁇ ing through the current ⁇ ource diode 2g is charged at the conden ⁇ er 3d, and the voltage from the three pha ⁇ e line both voltage ⁇ inputting portion 4 i ⁇ applied to the re ⁇ i ⁇ tor 3f and i ⁇ charged at the conden ⁇ er 3e through a voltage regulator circuit constituted as resi ⁇ tor ⁇ 3g - 3j, transi ⁇ tor ⁇ 3k, 31 and a zener diode 3m a ⁇ well a ⁇ through the diode 3a, ⁇ witch 3n, diode 3p and a resi ⁇ tor 3q.
- the line voltage i ⁇ 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 ⁇ witch (referring to Fig. 5) to the three phase line both voltages inputting portion 4, transformed/in ⁇ ulated ( ⁇ eparated) by mean ⁇ of auxiliary tran ⁇ former ⁇ 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.
- a part of pha ⁇ e current ⁇ ignal ⁇ rectified at the pha ⁇ e/ground current detecting portion 2 is applied through the pha ⁇ e pick up re ⁇ i ⁇ tor 2e to a re ⁇ i ⁇ tor 2h.
- the voltage pa ⁇ ing through a re ⁇ i ⁇ tor 2j i ⁇ grounded through the collector-emitter of the transi ⁇ tor 2i and the collector become low.
- the bia ⁇ voltage of the low ⁇ tate is applied to a resistor 2k, and a transistor 21 is turned off.
- the high signal through a re ⁇ i ⁇ tor 2m from the collector of the tran ⁇ i ⁇ tor 21 i ⁇ ⁇ upplied through a diode 2n to a rush current restraining portion 6 and a voltage/current restraining portion 7.
- the other part ⁇ of pha ⁇ e current ⁇ ignal ⁇ each is applied through resistors 2p and 2q to a phase/ground failure current detecting portion 5 along with the voltage ⁇ ignal in proportion to the pha ⁇ e current from the pha ⁇ e 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 signal ⁇ tran ⁇ formed/in ⁇ ulated at the three pha ⁇ e line voltage inputting portion 4 each i ⁇ rectified by rectifying diode ⁇ 4m, 4n, 4p, 4q, 4r and 4 ⁇ , combined with one another in an OR logic configuration and inputted into the voltage detecting portion 12.
- the voltage signal is applied through re ⁇ i ⁇ tor ⁇ 12a and 12b, a condenser 12c, a zener diode 12d and a resi ⁇ tor 12e to the inverting terminal of a comparator 12f and the reference voltage i ⁇ applied to the non-inverting terminal of the comparator 12f. Thu ⁇ , the comparator 12f can detect the on-voltage of a line. If the on-voltage i ⁇ detected, the comparator 12f output ⁇ the low ⁇ ignal. Therefore, the voltage detecting portion 12 can detect the ⁇ ignal according to the non-exi ⁇ tence or exi ⁇ tence of the line voltage.
- the three pha ⁇ e line both voltage ⁇ inputting portion 4 can detect the ⁇ ingle pha ⁇ e voltage of both line ⁇ by relay ⁇ Rl and R2 each having auxiliary contacting point ⁇ MB1 and MB2.
- the output ⁇ from these contacting points are inputted in an AND logic state to the throw timing portion 13 and the throwing operation portion 14.
- a line automation control section ⁇ witch i ⁇ thrown ⁇ o 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 tran ⁇ i ⁇ tor 21 i ⁇ applied through diode 2n to the ru ⁇ h current restraining gprtion 6 and the voltage/current restraining portion 7. Thu ⁇ , the bias voltage of the low ⁇ tate is applied to the base of a transistor 12m to turn off the tran ⁇ i ⁇ tor 12m, becau ⁇ e the comparator 12f of the voltage detecting portion 12 outputs the low signal.
- 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.
- the transistor 12m of the voltage detecting portion 12 i ⁇ turned off and the high ⁇ ignal i ⁇ applied through a re ⁇ i ⁇ tor 12r to the ba ⁇ e of a tran ⁇ i ⁇ tor 12 ⁇ to turn on a tran ⁇ i ⁇ tor 12 ⁇ .
- the turning on of the tran ⁇ i ⁇ tor 12s enable ⁇ the low signal to apply through resi ⁇ tors 12u and 12v to the base of a tran ⁇ i ⁇ tor 12t, thereby turning off the transi ⁇ tor 12t.
- the output of the high ⁇ tate applied through a re ⁇ i ⁇ tor 12w to the collector of the tran ⁇ istor 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 transi ⁇ tor 12 ⁇ re ⁇ train ⁇ the operation ⁇ of a lock-out timing portion 16 and a counter re ⁇ et timing portion 18, so that the control operation is maintained at the normal state.
- a back up device performs the in ⁇ tantaneous operation for removing the transient failure, or the line automation control section switch perform ⁇ the counting operation with being thrown when the power ⁇ ource i ⁇ again broken down in the procedure of the identification throw of the line.
- the voltage i ⁇ not interrupted by the pick up re ⁇ i ⁇ tor 2e to turn off the tran ⁇ i ⁇ tor 2i.
- the collector of the tran ⁇ i ⁇ tor 2i become ⁇ high by the re ⁇ istor 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 transi ⁇ tor 21 become ⁇ low.
- both voltage ⁇ inputting portion 4 any voltage ⁇ ignal is not applied to the auxiliary transformers 4a - 4f and the diodes 4m - 4s, while any voltage signal is not applied through resistor ⁇ 12a, 12b and 12e to the inverting terminal of the comparator 12f. Thu ⁇ , the comparator 12f applies the high level signal through the resistor 12j, the diode 12k and the resi ⁇ tor 121 to the base of the tran ⁇ i ⁇ tor 12m to turn on the tran ⁇ i ⁇ tor 12m.
- the collector of the tran ⁇ i ⁇ tor 12m become ⁇ low, so that the bias voltage i ⁇ not applied to the bia ⁇ resi ⁇ tor 7b of the voltage/current re ⁇ training portion 7, thereby turning off the tran ⁇ i ⁇ tor 7b.
- the control ⁇ ignal re ⁇ training the input with re ⁇ pect to the counting portion 20 i ⁇ released (removed), and the input with re ⁇ pect to the counting portion 20 i ⁇ applied through a re ⁇ i ⁇ tor 20a and a conden ⁇ er 20b to a re ⁇ istor 20c to turn on a tran ⁇ i ⁇ tor 20d.
- a relay coil i ⁇ 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 ( ⁇ imilarly, a contacting point RSAl i ⁇ turned on) while to apply the current pa ⁇ ing through latch relay contacting point ⁇ LR1B1 and LR1B2 to the relay coil RY1 to be energized. Thu ⁇ , a relay RY1A1 i ⁇ turned on to maintain the energizing ⁇ tate of the relay coil RY1.
- a contacting point RY1A2 i ⁇ turned on and a tran ⁇ istor 20f is turned on by the current pas ⁇ ing through a contacting point RSA2 and a re ⁇ istor 20e.
- a latch relay set coil LR1/S is operated to turn on the contacting point LR1A2, the contacting point LR1B1 i ⁇ turned off and the contacting point LR1A1 of a trip outputting portion 22 i ⁇ turned on. Thu ⁇ , if the line automation control ⁇ ection ⁇ witch co-operate ⁇ with the recloser, the counting portion 20 and ⁇ electing ⁇ witche ⁇ SW1A and SW1B of the back up device are placed on the normal po ⁇ ition a ⁇ shown in Fig. 6.
- Unles ⁇ the re ⁇ et coil LR1/R of an opening operation portion 21 is normally operated, they continue to maintain the on- ⁇ tate, prepare again ⁇ t next sequence and perform the once counting operation. Therefore, the counting portion 20 memorizes only once counting operation and doe ⁇ not open the line automation control ⁇ ection ⁇ witch.
- the counting portion 20 and ⁇ electing ⁇ witche ⁇ SW1A and SW1B of the back up device are placed on the po ⁇ ition of the circuit breaker (SW1A i ⁇ off, SW1B i ⁇ on).
- the latch relay contacting point LR1A1 of the trip outputting portion 22 i ⁇ turned on and a relay of the trip outputting portion 22 i ⁇ operated.
- Thu ⁇ the contacting point TRA1 of the opening operation portion 21 i ⁇ turned on through an auxiliary contacting point MA3.
- Thu ⁇ the trip coil 27 i ⁇ energized and the ⁇ witch 28 i ⁇ opened only one time.
- the relay contacting point ⁇ RSA2 and RAS3 are turned on, and the relay coil RY2 i ⁇ energized.
- the operation of the relay coil RY2 turn ⁇ on a relay contacting point RSA2 and applie ⁇ the high level bia ⁇ ⁇ ignal to a re ⁇ i ⁇ tor 20k to turn on a transistor 201.
- the transistor 201 Upon the turning on of the transistor 201, the current pas ⁇ ing through the relay contacting point RY2A2 and the re ⁇ i ⁇ tor 20m i ⁇ by-pa ⁇ sed through the collector- emitter of the tran ⁇ istor 201 to ground, and the collector becomes low. Thus, a coupling conden ⁇ er 20n is under the di ⁇ charged ⁇ tate. At the moment that the relay contacting point ⁇ RSA2 and RAS3 are turned off, the tran ⁇ i ⁇ tor 201 is turned off.
- the collector Upon the turning off of the tran ⁇ i ⁇ tor 201, the collector become ⁇ high, and the current is applied through the relay contacting point RY2A2 and the re ⁇ i ⁇ tor 20m to the coupling conden ⁇ er 2On.
- the turning on of the tran ⁇ i ⁇ tor 20q enable ⁇ the current to be applied to a relay RR2.
- a relay contacting point RR2A1 of a trip outputting portion 22 i ⁇ turned on to operate the relay TR.
- the relay contacting point TRA1 As the relay TR is operated, the relay contacting point TRA1 is turned on, and the trip coil 27 is energized by the current pas ⁇ ing through a ⁇ witch protecting contacting point MA3 and a relay contacting point TRA1, ⁇ o that the counting/opening operation i ⁇ e ⁇ tablished only twice.
- 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 a ⁇ follow ⁇ : The counting/ opening operation is performed while the high level ⁇ ignal i ⁇ applied through the relay contacting point TRA1, the re ⁇ istor 21a and the diode 21b to the base of the transi ⁇ tor 21c to turn on the tran ⁇ i ⁇ tor 21c, thereby operating the latch relay re ⁇ et coil LRl/R. Then, the latch relay contacting points LR1B1 and LR1A2 of the counting portion 20 and the latch relay contacting point ⁇ LR1A1 of the trip outputting portion 22 i ⁇ re ⁇ et ⁇ o that the initial normal control ⁇ tate i ⁇ recovered.
- the counter reset operation i ⁇ performed by the timing a ⁇ follow ⁇ : if the line voltage i ⁇ continuou ⁇ ly applied after the once counting operation, the comparator 12f of the voltage detecting portion 12 outputs the low level signal to turn off the tran ⁇ i ⁇ tor 12m, but the transi ⁇ tor 12s is turned on by the high level ⁇ ignal applied to the base through the zener diode 12n and the re ⁇ i ⁇ tors 12p and 12r, and its collector becomes low.
- the high level signal i ⁇ applied through a re ⁇ i ⁇ tor 18a of the counter re ⁇ et timing portion 18 to the collector of a tran ⁇ i ⁇ tor 18b.
- the tran ⁇ i ⁇ tor 18b i ⁇ ⁇ aturated to charge the conden ⁇ er 18f through a variable re ⁇ i ⁇ tor 18c and a base resistor 18e of a transistor 18d. If the charging operation is completed after the predetermined time elap ⁇ ing, the level ⁇ ignal i ⁇ applied through a re ⁇ i ⁇ tor 18g to the non-inverting terminal of a comparator 18h, so that the comparator 18h outputs the high level signal.
- the system of Fig. 6 returns to the initial normal control ⁇ tate.
- the ru ⁇ h current restraining function i ⁇ a ⁇ follow ⁇ If the counting operation or the counting/opening operation is performed, when the power failure happen ⁇ 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 transi ⁇ tor 7b in the voltage/current re ⁇ training portion 7 to turn off the tran ⁇ i ⁇ tor 7b.
- the ⁇ etting circuit of the ru ⁇ h current re ⁇ training portion 6 cau ⁇ e ⁇ the current to be applied through the re ⁇ i ⁇ tor 6c to the coupling conden ⁇ er 6a.
- the latch relay contacting point ⁇ LR6A1 of the pha ⁇ e/ground failure current detecting portion 5 is turned on and the latch relay contacting points LR6B1 of the ru ⁇ h current restraining portion 6 is turned off, so that the comparators 5a and 5b of the phase/ground failure current detecting portion 5 i ⁇ grounded at the non-inverting terminal to force the current detection to be re ⁇ trained. Thu ⁇ , if the control ⁇ ignal i ⁇ generated at the time of throwing of the line, again, a conden ⁇ er 6h i ⁇ charged at the predetermined voltage by a variable re ⁇ i ⁇ tor 6h and a re ⁇ i ⁇ tor 6g of the ru ⁇ h current re ⁇ training portion 6.
- the tran ⁇ istor 6n i ⁇ turned on, and the latch relay contacting point ⁇ LR6/R i ⁇ operated, ⁇ o that the latch relay contacting point ⁇ LR6A1 of the phase/ground failure current detecting portion 5 i ⁇ turned off, while the latch relay contacting point ⁇ LR6B1 of the ru ⁇ h current re ⁇ training portion 6 i ⁇ turned on.
- the line automation control ⁇ ection ⁇ witch i ⁇ automatically thrown as follows, when the power ⁇ ource i ⁇ again applied thereto after it ⁇ counting/opening operation. If the line voltage i ⁇ supplied at the time of the re-throwing of the back up device, the transi ⁇ tor 12t of the voltage detecting portion 12 is turned off to cause the high level signal to be applied to its collector. Thu ⁇ , the on-voltage detecting memory portion 15 generate ⁇ the control ⁇ ignal by the current pa ⁇ ing through a re ⁇ i ⁇ tor 12w and an on- contacting point MB3 under the opening ⁇ tate of an auxiliary contacting portion 23.
- the current is applied through a re ⁇ i ⁇ tor 15a to a conden ⁇ er 15b.
- a tran ⁇ istor 15d is turned on by the bia ⁇ voltage of a re ⁇ istor 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.
- the throw timing portion 13 charges the current through a variable re ⁇ i ⁇ tor 13a to a conden ⁇ er 13c on the ba ⁇ e of a tran ⁇ istor 13b at the predetermined level voltage.
- the high level ⁇ ignal i ⁇ applied through a re ⁇ i ⁇ tor 13d to the non-inventing terminal of a comparator 13e. If the inputting voltage i ⁇ higher than the reference voltage, the comparator 13e output ⁇ the high level ⁇ ignal through a re ⁇ istor 13f to a transi ⁇ tor 13g. At that time, the tran ⁇ istor 13e i ⁇ turned on to energize a relay coil RR4 while to turn on the contacting point RR4A1 of the throw operating portion 14.
- the throw coil 29 throws the ⁇ witch 28.
- a ⁇ the contacting point RR4A1 i ⁇ turned on, the latch relay coils LR3/R, LR5/S and LR7/S are energized to ⁇ et or re ⁇ et each operating portion a ⁇ de ⁇ cribed above, ⁇ o that the control function ⁇ return to the normal ⁇ tate.
- the line automation control section switch in the failure ⁇ ection i ⁇ opened/locked out only at one time a ⁇ follow ⁇ , when it i ⁇ thrown in the procedure of the identification throw.
- the failure current is detected during the occurring of the failure section as follows:
- the phase failure current flows through the phase pick up re ⁇ i ⁇ tor 2e of the pha ⁇ e/ground current detecting portion 2.
- the pha ⁇ e failure current is divided by a resistor 5c in a predetermined voltage and applied to a transistor 5d.
- the tran ⁇ istor 5d is turned on to cause the current in proportion to the line to flow through the emitter-collector of the transi ⁇ tor 5d.
- the phase current i ⁇ a failure current
- the comparator 5a If the inputted voltage i ⁇ higher than the reference voltage formed by re ⁇ i ⁇ tor ⁇ 5g and 5h, the comparator 5a generate ⁇ the high level signal to supply it through a re ⁇ i ⁇ tor 5i and a diode 5g to a condenser 5k.
- a tran ⁇ i ⁇ tor 5m i ⁇ turned on by a re ⁇ istor 51.
- the signal applied to a resi ⁇ tor 5n is by-passed through the collector-emitter of the transi ⁇ tor 5n to the ground, and the collector become ⁇ low, while the ⁇ ignal applied to a re ⁇ i ⁇ tor 5p doe ⁇ not turn on a transistor 5q.
- the tran ⁇ istor 5q i ⁇ turned off it ⁇ collector become ⁇ high, ⁇ o that the voltage ⁇ ignal applied to a re ⁇ i ⁇ tor 5r i ⁇ applied through a diode 5 ⁇ to the contacting point LR5A1.
- the contacting point LR5A1 of the once opening portion 19 is already set at the time of the throw.
- It ⁇ collector become ⁇ low, and a transi ⁇ tor 19e i ⁇ turned off by re ⁇ i ⁇ tor ⁇ 19c and 19d.
- the collector of the tran ⁇ i ⁇ tor 19e become ⁇ high by a re ⁇ i ⁇ tor 19f, which i ⁇ coupled with the collector of the tran ⁇ istor 7b of the voltage/current re ⁇ training portion 7 by a diode 19g, so that any operation is restrained unle ⁇ s the voltage and current on the lined is existed.
- the ground failure current flows through the phase pick up resistor 2f of the pha ⁇ e/ground current detecting portion 2.
- the voltage of both end ⁇ of the pha ⁇ e pick up re ⁇ istor 2f is inputted through the resi ⁇ tor 2q into the pha ⁇ e/ground failure current detecting portion 5.
- the ground failure current i ⁇ divided by a variable re ⁇ i ⁇ tor 5c in a predetermined voltage and applied to a transi ⁇ tor 5d. Thu ⁇ , the tran ⁇ i ⁇ tor 5d is turned on to cause the current in proportion to the line to flow through the emitter-collector of the transistor 5d.
- the voltage on both end ⁇ 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 resi ⁇ tors 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.
- the ⁇ ignal applied to a re ⁇ istor 50p does not turn on a transi ⁇ tor 50q.
- the contacting point LR5AL of the once opening portion 19 is already set at the on state at the time of the throw.
- Thu ⁇ the high level ⁇ ignal passing through the diode 5s i ⁇ applied through the contacting point LR5A1 and a re ⁇ i ⁇ tor 19a to a transistor 19b to turn on the transistor 19b, its collector becoming low.
- the transistor 19e is turned off.
- Thu ⁇ the collector of the tran ⁇ istor 19e i ⁇ coupled with the collector of the tran ⁇ istor 7b of the voltage/current restraining portion 7 by a diode 19g, so that any operation i ⁇ restrained unle ⁇ the voltage and current on the lined is existed.
- the once opening portion 19 delays its output while the charged voltage of condenser 5k or 50k of the pha ⁇ e/ground failure current detecting portion 5 i ⁇ di ⁇ charged through the re ⁇ istors 51 or 501. At that time that the tran ⁇ i ⁇ tor 7b of the voltage/current restraining portion 7 i ⁇ 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..
- the voltage ⁇ ignal applied to a resistor 22d is by-passed through the collector-emitter of the transi ⁇ tor 22c to the ground.
- a tran ⁇ i ⁇ tor 22f is not turned on by a resistor 22e.
- the voltage ⁇ ignal is applied through a re ⁇ i ⁇ tor 22g, a conden ⁇ er 22h and a re ⁇ i ⁇ tor 22i to turn on a tran ⁇ i ⁇ tor 22j.
- a transi ⁇ tor 25d coupled in a Darlington configuration to the tran ⁇ i ⁇ tor 25c is al ⁇ o 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.
- the control power is turned off a ⁇ soon as being opened. It means that only once opening is the permanent opening.
- the line automation control section switch of the invention can not be automatically thrown even though the line i ⁇ again recovered to the on- voltage, when the power ⁇ ource i ⁇ broken down after the detection of the failure current during the proceeding of the lock-out timing.
- Al ⁇ o when the manual throwing operation i ⁇ performed in the procedure of the opening/locking-out operation, if the pu ⁇ h button ⁇ witch PB2 of the opening operation portion i ⁇ turned on
- the tran ⁇ i ⁇ tor ⁇ 25c and 25d of the lock-out outputting portion 25 are operated, the latch relay ⁇ etting coil LO/S i ⁇ energized, and the contacting point LOB1 of the control circuit power ⁇ ource 24 i ⁇ turned off while the trip coil 27 i ⁇ operated and then the ⁇ witch 28 i ⁇ once opened/locked out.
- the counting or opening operation i ⁇ not performed even when the power ⁇ ource is broken down, if the normal current i ⁇ detected during the proceeding of the lock-out timing (for example, the contacting point LR5A1 of the once opening portion 19 i ⁇ turned on) . Because the failure current of the once opening portion 19 is not detected and the latch relay contacting point ⁇ LR5B2 of the counting portion 20 i ⁇ turned off.
- the throwing/locking-out operation procedure ⁇ are a ⁇ follows: The input to the lock-out timing portion 16 i ⁇ supplied from the collector of the transistor 12s of the voltage detecting portion 12. In that case, the collector of the transi ⁇ tor 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 point ⁇ LR3A2 and LR6B1 are turned off, and a conden ⁇ er 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.
- the comparator 16f If the inputted voltage is higher than the reference voltage, the comparator 16f generates the high level signal to supply it through a resi ⁇ tor 16h to a tran ⁇ i ⁇ tor 16i.
- the tran ⁇ i ⁇ tor 16i i ⁇ turned on, the latch relay re ⁇ etting coil LR5/R i ⁇ 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.
- the pu ⁇ h button switch SW1 is operated for the co-operation with the circuit breaker, the switch SWla of the counting portion 20 i ⁇ turned off, the ⁇ witch SWlb of the trip outputting portion 22 i ⁇ turned off.
- the ⁇ witch completing the throwing of the good line in the procedure of the throwing i ⁇ not opened only by once counting operation time, even if the power failure happens, again.
- the non-operation timing is performed by the selecting switch SW1 a ⁇ follow ⁇ :
- 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. Al ⁇ o, the contacting point LR7B1 of the counting portion 20 i ⁇ turned off, and the counting operation i ⁇ not performed.
- the power ⁇ ource 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.
- Al ⁇ o even if the contacting point LR5B2 of the counting portion 20 i ⁇ turned on upon the completion of the non-operation timing, the counting portion 20 doe ⁇ not perform with being opened by the ⁇ electing switch SWla of the back up device.
- the contacting point LR5A2 of the non- operation timing portion 26 is turned off upon the completion of the lock-out timing, a conden ⁇ er 26c on the ba ⁇ e ⁇ ide of a tran ⁇ i ⁇ tor 26b i ⁇ charged by the current pa ⁇ ing through a re ⁇ istor 26a, in which the condenser 26c i ⁇ connected to the anode of a programmable uni ⁇ junction transistor 26d.
- the tran ⁇ i ⁇ tor 26e i ⁇ turned on, and the tran ⁇ i ⁇ tor 16f coupled in a darlington configuration with the tran ⁇ i ⁇ tor 26e i ⁇ also turned on to energize a latch relay coil LR7/R.
- the 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.
- the contacting point LR7B1 of the counting portion 20 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. Thu ⁇ , in case of the co-operation with the circuit breaker, the switch control sy ⁇ tem 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 ⁇ ection i ⁇ performed.
- 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.
- a condenser 17g connected to the ba ⁇ e of a tran ⁇ i ⁇ tor 17f i ⁇ charged by the current pa ⁇ ing through a variable re ⁇ i ⁇ tor 17e and the contacting point LR3A1.
- the programmable uni-junction transi ⁇ tor 17h begin ⁇ 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 transi ⁇ tor ⁇ 25c and 25d.
- the transistor ⁇ 25c and 25d are turned on, the latch relay re ⁇ etting coil LO/S i ⁇ operated, and the contacting point LOB1 of the control circuit power ⁇ ource 24 i ⁇ turned off, thereby paralyzing the control function of each circuit.
- the line automation control section switch is turned on by the separate selecting ⁇ witch SW2.
- the non-voltage lock-out timing portion 17 may be not u ⁇ ed.
- the adaption of the technology to the radial line or the branch line enables only the failure ⁇ ection to be separated from the good ⁇ ection. Thu ⁇ , it i ⁇ not nece ⁇ ary to lock out the line automation control ⁇ ection ⁇ witches.
- Fig. 7 i ⁇ a block diagram illustrating another embodiment of an tie power distribution line automation switching sy ⁇ tem (TFAS).
- the tie line automation control ⁇ witch on the line i ⁇ operated with being nomally opened.
- the line voltage on the A-power ⁇ ource line 101 i ⁇ applied through a tran ⁇ former 102 to first three phase voltage inputting portion 103.
- the first three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 rectify the voltage ⁇ ignal ⁇ inputted from the tran ⁇ former ⁇ 102 and 105, re ⁇ pectively.
- the constant voltage charging portion 108 receive ⁇ the output voltage ⁇ 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 signal ⁇ detected at the fir ⁇ t and ⁇ econd detecting portions 107 and 109 are coupled in an exclusive NOR logic configuration with each other at a control logic portion 111.
- 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 ⁇ ignal from the counting portion 113 and the ⁇ ignal from the control logic portion 111 to perform the throw timing operation, the output ⁇ ignal from the throw timing portion 114 of which operate ⁇ a trip coil 116 to throw a ⁇ witch 117 of the control ⁇ y ⁇ tem according to the invention.
- the lock-out timing portion 115 receive ⁇ the ⁇ equence ⁇ ignal 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 pa ⁇ ing through a lock-out operating portion 118. Thu ⁇ , the latch operating portion 119 turns off the control power source 110, so that the tie line automation control switch 117 i ⁇ locked-out with being opened.
- the counter reset timing portion 112 receives the signal ⁇ from the control logic portion 111 and the counting portion 113 to ⁇ upply it ⁇ output to a counter re ⁇ etting portion 120.
- the counter re ⁇ etting portion 120 receive ⁇ the ⁇ ignal ⁇ from the con ⁇ tant voltage charging portion 108 and the counter re ⁇ et timing portion 112 to re ⁇ et the counting portion 113.
- a throwing switch 121 operates the throwing coil 116 a ⁇ well as applie ⁇ it ⁇ output ⁇ ignal to the lock-out outputting portion 118 to ⁇ et the latch operating portion 119 while to turn ⁇ off the control power ⁇ ource 110, thereby locking-out the ⁇ witch 117.
- a opening ⁇ witch portion 122 operate ⁇ a trip coil 123 by the power voltage from the con ⁇ tant voltage charging portion 108 to open the switch 117 when opened by the manual operation.
- a control resetting switch 124 i ⁇ connected through the constant voltage charging portion 108 to the latch operating portion 119 to perform the re ⁇ etting operation, ⁇ o that the control power ⁇ ource 110 i ⁇ turned on by the re ⁇ etting ⁇ ignal from the latch operating portion 119. Thu ⁇ , after the tie power di ⁇ tribution line automation ⁇ witching ⁇ ystem 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 de ⁇ cribed above i ⁇ a ⁇ follows: While the tie line automation control ⁇ witch 117 i ⁇ operated with being opened, a ⁇ uming that the power failure happens once, when the back up device performs the in ⁇ tantaneous operation for removing the transient failure; the counting portion 113 performs the once counting function by the ⁇ ignal from the control logic portion 111.
- the output from the counting portion 113 i ⁇ ⁇ upplied to the throw timing portion 114 and the lock-out timing portion 115 but in ca ⁇ e that the back up device i ⁇ a reclo ⁇ er, by the ⁇ elective 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.
- the counting portion 113 performs only the counting operation, but does not generate the trip output.
- the tie line automation control switch 117 i ⁇ thrown in a rever ⁇ e-supply manner the power failure i ⁇ not removed and continued, and the back up device interrupt ⁇ the ⁇ econd failure thereby to occur the power failure.
- the lock-out control function is as follows: The output from the throw timing potion 114 is ⁇ upplied to the lock-out outputting portion 118. A ⁇ the lock-out outputting portion 118 is operated, the latch operating portion 119 i ⁇ operated. The ⁇ et output from the latch operating portion 119 turn ⁇ off the control power source 110, and the switch 117 i ⁇ thrown as well a ⁇ locked out (control function device).
- the lock-out procedure ⁇ 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 ⁇ ection of the switch 117 is determined as the failure, and the lock-out timing portion 115 i ⁇ operated by the third sequence of the counting portion 113. In that ca ⁇ e, if the power failure i ⁇ maintained and it i ⁇ judged that the switch 117 i ⁇ 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 ⁇ etting output from the latch operating portion 119 turns off the control power ⁇ ource 110 to lock out the control ⁇ y ⁇ tem.
- the tie line automation control switch 117 doe ⁇ not throw the failure ⁇ ection 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 ⁇ witch 124 i ⁇ manually pre ⁇ ed, ⁇ o that the control power ⁇ ource 110 i ⁇ turned on by the resetting operation of the latch operating portion 119. It means that the ⁇ y ⁇ tem can perform the normal control function ⁇ .
- the counter re ⁇ et timing portion 112 is operated by the outputs from the control logic portion 111 and the counting portion 113. If it i ⁇ judged that the voltage ⁇ on both line ⁇ are continuously maintained and both line ⁇ are normal, the output from the counter reset timing portion 112 i ⁇ supplied to the counter re ⁇ etting portion 120 after the completion of the counter re ⁇ et timing. Then, the counter resetting portion 120 is operated to reset the counting portion 113.
- the tie line control ⁇ ystem returns to the initial sequence control state. Also, when the ⁇ witch i ⁇ 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 re ⁇ et the counting portion 113.
- Figs. 8a and 8b are the detailed circuits of Fig. 7 illust ⁇
- tie power distribution line automation ⁇ witching ⁇ y ⁇ tem Another embodiment of a tie power distribution line automation ⁇ witching ⁇ y ⁇ tem.
- the tie line automation control ⁇ witch 117 i ⁇ configured to detect the voltage ⁇ on both line ⁇ (A-power source and B-power source) with being normally opened.
- the three phase line voltage on the A-power source line 101 i ⁇ applied through a tran ⁇ former 102 to first three phase voltage inputting portion 103.
- the three pha ⁇ e line voltage on the B-power ⁇ ource line 104 is applied through a transformer 105 to ⁇ econd 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 ⁇ ignal ⁇ inputted from the tran ⁇ former ⁇ 102 and 105, respectively, in which the fir ⁇ t three pha ⁇ e voltage inputting portion 103 drop ⁇ 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 supplie ⁇ them to fir ⁇ t voltage detecting portion 107 and a con ⁇ tant voltage charging portion 108, re ⁇ pectively, and the ⁇ econd three phase voltage inputting portion 106 drop ⁇ the three pha ⁇ e line voltage ⁇ at each tran ⁇ former 106a, 106b and 106c, rectifie ⁇ them at diode ⁇ 106d, 106e and 106f, and rectifies them at diode ⁇ 106g, 106h and 106i and
- the con ⁇ tant voltage charging portion 108 receive ⁇ the ⁇ ignals from the fir ⁇ t three phase voltage inputting portion 103 and the second three phase voltage inputting portion 106 through a resi ⁇ tor 108a, in which the received ⁇ ignal ⁇ are maintained at the con ⁇ tant voltage by re ⁇ i ⁇ tors 108b - 108e, transistors 108f and 108g and a zener diode 108h and charged to conden ⁇ er 108i through a diode 108h', and the charged voltage i ⁇ formed as a con ⁇ tant voltage by a con ⁇ tant voltage control power ⁇ ource including the diode 108j, the re ⁇ i ⁇ tor 108k and the conden ⁇ er 1081.
- the direct current ⁇ ignal ⁇ from the first three phase voltage inputting portion 103 are divided by resi ⁇ tors 107a and 107b of the first voltage detecting portion 107 and supplied through a condenser 107c, a zener diode 107d and a resi ⁇ tor 107e to the inverting terminal of a comparator 107f.
- the output from the comparator 107f i ⁇ compared with the reference voltage ⁇ et by a variable re ⁇ i ⁇ tor 107g and re ⁇ i ⁇ tor ⁇ 107h and 107i.
- the direct current ⁇ ignals from the ⁇ econd three pha ⁇ e voltage inputting portion 106 are divided by re ⁇ i ⁇ tor ⁇ 109a and 109b and ⁇ upplied 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 re ⁇ i ⁇ tor 109g and resi ⁇ tor ⁇ 109h and 109i.
- 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.
- the power failure happens at one line side, for example A-power source side
- the back up device performs the in ⁇ tantaneou ⁇ operation for removing the tran ⁇ ient failure due to the line failure
- the output £rom the comparator 107f become ⁇ high.
- any one of both line power source ⁇ i ⁇ broken down any one of the outputs from the first voltage detecting portion 107 and the ⁇ econd voltage detecting portion 109 become high. If the output from the fir ⁇ t voltage detecting portion 107 i ⁇ high, the voltage- divided ⁇ ignal by the resistor ⁇ 107k and Ilia i ⁇ supplied through a conden ⁇ er 111b to one end of a NAND gate 111c a ⁇ well a ⁇ to one end of a NAND gate 11Id. While, the output from the comparator 109f i ⁇ maintained at the low ⁇ tate.
- the low level ⁇ ignal i ⁇ ⁇ upplied through the re ⁇ i ⁇ tor llle and the conden ⁇ er lllf to one end of a NAND gate lllg a ⁇ well a ⁇ to the other end of the NAND gate Ilia. Thu ⁇ , the NAND gate 111c generates the high level ⁇ ignal, and the NAND gate lllg al ⁇ o outputs the high level signal.
- the NAND gate llld combines the high level ⁇ ignal of the NAND gate 111c with the high level ⁇ ignal from the fir ⁇ t voltage detecting portion 107 in a logic configuration to generate the low level ⁇ ignal.
- the NAND gate lllh combine ⁇ the low level ⁇ ignal of the NAND gate llld with the high level ⁇ ignal of the NAND gate lllg in a logic configuration to output the high level ⁇ ignal. Also, if the output of the comparator 107 i ⁇ low and the output of the comparator 109 i ⁇ high, the NAND gate 111c and the NAND gate lllg generate the high level ⁇ ignal ⁇ , the NAND gate llld generates the low level ⁇ ignal and the NAND gate lllh output ⁇ the high level signal.
- the control logic portion 111 having an exclusive NOR configuration receives ⁇ ignal ⁇ different from each other, so that the NAND gate lllh generate ⁇ the high level ⁇ ignal to turn on the transi ⁇ tor 1111.
- the tran ⁇ i ⁇ tor 113b is turned off.
- the tran ⁇ istor 113b i ⁇ As the tran ⁇ istor 113b i ⁇ turned off, it ⁇ collector made into the high level state.
- the high level ⁇ ignal i ⁇ ⁇ upplied through a re ⁇ istor 113c to a condenser 113d.
- the conden ⁇ er 113d i ⁇ charged and then one pul ⁇ e ⁇ ignal is supplied through a resistor 113e to a transi ⁇ tor 113f to turn on the tran ⁇ istor 113f.
- the relay coil RS As the transi ⁇ tor 113f i ⁇ turned on/off according to the pul ⁇ e signal, the relay coil RS is turned on and then turned off.
- a relay coil RY1 is energized to turn on the contacting point RY1A1. While the contacting point RY1A2 i ⁇ turned on to apply the current through resi ⁇ tor ⁇ 113g and lllh to the ba ⁇ e of the tran ⁇ i ⁇ tor llli.
- the relay contacting point RSAl i ⁇ turned from the on- ⁇ tate into the off- ⁇ tate (at that time, the contacting point RSBl i ⁇ turned from the off- ⁇ tate into the on- ⁇ tate)
- the low level ⁇ ignal i ⁇ applied to the ba ⁇ e of the tran ⁇ i ⁇ tor 113i to turn off the transistor 113i.
- the power ⁇ ource voltage applied in ⁇ equence to a contacting point RY1A2 the ⁇ witch SW1 and a re ⁇ istor 113j is supplied through a condenser 113k and a resistor 1131 to a transistor 113m.
- a ⁇ the tran ⁇ i ⁇ tor 113m is turned on, a latch relay setting coil LR1/S of the couner re ⁇ etting portion 120 is operated, a contacting point LR1A1 i ⁇ turned on and the contacting point LR1B1 is turned off.
- the counting portion 113 memorize ⁇ only once counting operation, and the ⁇ witch 117 of the control ⁇ y ⁇ tem i ⁇ not opened.
- 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 ⁇ ignal i ⁇ applied a re ⁇ istor 113n to the ba ⁇ e of a tran ⁇ i ⁇ tor 113p.
- 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.
- the transi ⁇ tor 113t i ⁇ turned on, the latch relay ⁇ etting coil LR2/S i ⁇ operated while a tran ⁇ istor 120b is turned on by a resi ⁇ tor 120a of the counter re ⁇ etting portion 120.
- the transi ⁇ tor 114a i ⁇ turned off, the collector of which output ⁇ the high level ⁇ ignal.
- the comparator 114g co pare ⁇ the inputted voltage with the reference voltage ⁇ et at the inverting inputting terminal. If the inputted voltage is higher than the reference voltage, the comparator 114g outputs the high level ⁇ ignal to turn on a tran ⁇ istor 114i through a resi ⁇ tor 114h. The turning on of the tran ⁇ i ⁇ tor 114i cause ⁇ a relay coil RR4 to be operated.
- the voltage ⁇ ignal passing through the auxiliary contacting points MB1 of the tie line automation control switch 117 is ⁇ upplied through a contacting point RR4A1 and a diode Dl to a throwing coil 116.
- the throw coil 116 i ⁇ operated.
- the tie line automation control ⁇ witch 117 can be thrown in a rever ⁇ e- ⁇ upply manner.
- the lock-out procedure ⁇ of the control function are a ⁇ follow ⁇ : If the throwing operation is accomplished by the on-operation of the relay contacting point RR4A1 or the manual operation of the throwing ⁇ witch portion 121, the voltage i ⁇ applied through a diode 118a of the lock-out outputting portion 118 to a re ⁇ i ⁇ tor 118b. A tran ⁇ i ⁇ tor 118c i ⁇ turned on to operate a relay coil RO. Thu ⁇ , the contacting point ROA1 of the latch operating portion 119 i ⁇ turned on, and a latch relay ⁇ etting coil LO/S i ⁇ operated.
- the tie line automation control switch 117 i ⁇ operated in the same manner as the twice counting operation, and after the third counting operation the lock-out timing operation i ⁇ a ⁇ follows: If the voltage i ⁇ again thrown during the proceeding of the timing operation, the tran ⁇ i ⁇ tor 1111 of the control logic portion 111 is turned off, the collector of which become ⁇ high. Thu ⁇ , in the timing portion 114 the tran ⁇ i ⁇ tor 114a i ⁇ turned on through the re ⁇ i ⁇ tor 114b, the collector of which becomes high.
- the comparator 114g output ⁇ the low level ⁇ ignal to turn off the tran ⁇ i ⁇ tor 114i. Thu ⁇ , the throw timing portion 114 is reset.
- the relay contacting point RR4A1 is opened, and unle ⁇ the throwing switch 121 i ⁇ manually pre ⁇ ed, the throwing coil 116 i ⁇ not operated. Furthermore, the switch 117 i ⁇ not opened and only the counting operation i ⁇ performed.
- the relay coil RY3 i ⁇ 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.
- the contacting point RY3A2 is turned on, and the high level signal is applied through a resi ⁇ tor 113u to turn on a transi ⁇ tor 113v. While the voltage ⁇ ignal pa ⁇ ing through a contacting point RY3A2 and a resi ⁇ tor 113w i ⁇ by-pa ⁇ ed through the collector- emitter of the tran ⁇ i ⁇ tor 113v to the ground.
- the current i ⁇ flowed through the contacting point RY3A2, the re ⁇ istor 113w and a coupling condenser 113x.
- the transi ⁇ tor 113z is turned on to turn on a latch relay setting coil LR2/R.
- a latch relay coil LS3/S causes the contacting point LR3B2 in the timing portion 115 to be turned off. If one ⁇ ide power ⁇ ource of the line ⁇ counter is broken down, the transi ⁇ tor 1111 in the control logic portion 111 is turned on, the collector of which becomes high. Thus, a tran ⁇ istor 115b of the timing portion 115 i ⁇ turned off by a re ⁇ i ⁇ tor 115a, and the power voltage i ⁇ applied through a variable re ⁇ i ⁇ tor 115c and the base of a tran ⁇ i ⁇ tor 115d to a conden ⁇ er 115e. The conden ⁇ er 115e i ⁇ charged.
- the discharging voltage of the condenser 115e i ⁇ applied through a diode 115f and a re ⁇ i ⁇ tor 115g to the non- inverting terminal of the comparator 115h. If the inputting voltage is higher than the reference voltage by re ⁇ i ⁇ tor ⁇ 115i and 115j, the comparator 115h outputs the high level ⁇ ignal ⁇ .
- the high level ⁇ ignal is applied through a diode 115k and the resi ⁇ tor 118b of the lock ⁇ out outputting portion 118 to the transistor 118c. As the transi ⁇ tor 118c is turned on, the relay coil RO is operated.
- the contacting point ROA1 of the latch operating portion 119 i ⁇ turned on, and the latch relay ⁇ etting coil LO/S is operated.
- the operation of the latch relay ⁇ etting coil LO/S force the contacting point LOB1 of the control power source to be turned off.
- the power ⁇ ource 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 ⁇ witch 124 i ⁇ turned on and the latch relay re ⁇ etting coil LO/R i ⁇ operated to be re ⁇ et a ⁇ de ⁇ cribed above.
- the re ⁇ etting procedure ⁇ of the counting operation are as follows: As both power sources are exi ⁇ ted, the low level ⁇ ignal i ⁇ applied to one end ⁇ of NAND gate ⁇ 111c, llld and lllg of a control logic portion 111 and the other end of the NAND gate 111c, ⁇ o that the NAND gate 111c output ⁇ the high level ⁇ ignal ⁇ to ⁇ upply it to the other end of the NAND gate llld.
- the NAND gate llld output ⁇ the high level ⁇ ignal
- the NAND gate lllg also generates the high level signal ⁇ to apply it to both end ⁇ of the NAND gate lllh.
- the NAND gate lllh combine ⁇ two ⁇ ignal ⁇ in a logic combination and output ⁇ the low level ⁇ ignal through the re ⁇ istor 111k to the base of the transi ⁇ tor 1111, but the transistor 1111 is turned off, to the collector of which the high level signal is applied through a re ⁇ i ⁇ tor 111m.
- the transi ⁇ tor 112b i ⁇ turned on, the tran ⁇ i ⁇ tor 112c connected at the collector of a tran ⁇ i ⁇ tor 112b i ⁇ turned off.
- 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- ⁇ tate.
- the power ⁇ ource i ⁇ connected through a variable resi ⁇ tor 112d of the counter re ⁇ et timing portion 112 to a conden ⁇ er 112f.
- the conden ⁇ er 112f i ⁇ charged by the power voltage, through the ba ⁇ e of a tran ⁇ i ⁇ tor 112e.
- the voltage di ⁇ charged at the conden ⁇ er 112f i ⁇ provided through a diode 112g and a re ⁇ istor 112h to the non-inverting terminal of a comparator 112i.
- the comparator 112i If the inputting voltage i ⁇ higher than the reference voltage, the comparator 112i output ⁇ the high level ⁇ ignal to apply it through a re ⁇ i ⁇ tor 112j to a tran ⁇ i ⁇ tor 112k. A ⁇ the tran ⁇ i ⁇ tor 112k i ⁇ turned on, the relay coil is operated.
- the contacting point RR3A1 of the counter re ⁇ etting portion 120 i ⁇ turned on, the latch relay coils LRl/R, LR2/R and LR3/R are ⁇ imultaneously operated and all point ⁇ RSAl, RSA2, RSA3, RY1A1, RY2A1, RY3A1, RY1A2, RY2A2, RY3A2, LR1A1, LR2A1, LR1B1, LR2B1, LR3B1 and RSBl of the counting portion 113 are re ⁇ et to return to the normal control state.
- the counter re ⁇ etting operation is that when the relay coil RO of the lock-out outputting portion 118 is operated the contacting point ROA2 of the counter re ⁇ etting portion 120 i ⁇ turned on, and thu ⁇ the re ⁇ etting coil ⁇ LRl/R, LR2/R and LR3/R are operated to re ⁇ et the counting portion 113 a ⁇ de ⁇ cribed above.
- Fig. 9 is a schematically block diagram illustrating the configuration of a power distribution line automation control ⁇ ection ⁇ witching ⁇ y ⁇ tem.
- Al ⁇ o the current i ⁇ inputted directly or through a three pha ⁇ e 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 ⁇ upplied to a control power ⁇ ource portion 39 to be used a ⁇ the control voltage, or ⁇ upplied to a voltage detecting portion 40 to generate the ⁇ ignal according to the voltage detection.
- the ⁇ ignal ⁇ re ⁇ ulting 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 pha ⁇ e etc.
- a communication module 44 convert ⁇ the digital information from the microproce ⁇ or 41 into the modem information to tran ⁇ fer it to a remote controller (not shown), otherwise the inputted information into the digital memori ⁇ information to tran ⁇ fer it to the microproce ⁇ sor 41, thereby enabling the remote communication.
- 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.
- a power di ⁇ tribution line automation control section switching system 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 ⁇ ource and the voltage on the load, etc.
- the microproce ⁇ or 41 converts the data into the digital information and then judge ⁇ the ⁇ tate of the line ⁇ witch ba ⁇ ed on the program of the memory 42 to control the system.
- Fig. 10 is a flow chart illustrating a method for operating a power di ⁇ tribution line automation control ⁇ ection ⁇ witching ⁇ y ⁇ tem.
- ⁇ tep 201 it i ⁇ determined whether the line ⁇ witch i ⁇ ⁇ et a ⁇ a ⁇ ection ⁇ witch or a tie switch.
- Step 201 goe ⁇ on ⁇ tep 202 to set the ⁇ tate of the control ⁇ y ⁇ tem and operate the control sy ⁇ tem at the state that the switch i ⁇ ⁇ et a ⁇ it i ⁇ independent of the ⁇ ection ⁇ witch or the tie ⁇ witch.
- Step 203 the control i ⁇ proceeded to step 203 that the microprocessor 41 reads/initialize ⁇ the results which the contacting state of the ⁇ witch 51 (the opening, the throwing and the ga ⁇ pre ⁇ ure ⁇ tate) i ⁇ checked by the contacting point 52.
- Step 203 proceeds on step 204 that the microproces ⁇ or 41 initialize ⁇ the control ⁇ ystem.
- the microproces ⁇ or 41 identifie ⁇ the elapse of the predetermined time and perform ⁇ the real time control interrupt for checking a con ⁇ tant period at ⁇ tep 205.
- 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 ⁇ tep 206.
- the communication interrupt state is checked in order to receive the ⁇ electing ⁇ pecification by remote controller at step 207. If the communication mode i ⁇ not interrupted, the existence of the selecting ⁇ pecification by local mode is identified at step 208.
- the ⁇ tate control operation of the ⁇ witch 50 is performed according to the inputted information, while the display 43 show ⁇ 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 di ⁇ playing data for a predetermined time period at step 213, and controls the timer and terminates the real time interrupt operation at ⁇ tep 214.
- Fig. 12 ⁇ how ⁇ procedure ⁇ for controlling the inputting/ outputting of data to perform the remote control by the communication interrupt.
- the microproce ⁇ or 41 identifie ⁇ the po ⁇ ibility of transferring interrupt state at ⁇ tep 220, set ⁇ the control flag for the tran ⁇ ferring at ⁇ tep 221 if the tran ⁇ ferring mode i ⁇ interrupted, normally perform ⁇ the outputting of data through the communication module 44 to the remote controller by the control flag for tran ⁇ ferring at ⁇ tep 222, identifie ⁇ the pos ⁇ ibility of the receiving interrupt ⁇ tate if the tran ⁇ ferring mode is not interrupted or the transferring operation is normally performed at step 223, reads/ ⁇ tores the inputting data of the selecting specification received from the communication module 44 at ⁇ tep 224 if the receiving mode is interrupted, and perform ⁇ the ⁇ etting operation of the control flag for receiving at step 225.
- Figs. 13a, 13b and 14 show the control operation of the control
- Fig. 13a and 13b are the flow charts showing a method for controlling the operation of the ⁇ ection line control ⁇ ystem
- 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 sy ⁇ tem to the state changes (voltage ⁇ ⁇ tate - non-voltage ⁇ tate, the non-voltage state - the voltage state, normal current ⁇ tate - failure current ⁇ tate, failure current ⁇ tate - 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.
- the control ⁇ y ⁇ tem is set as the section at the state at ⁇ tep 231.
- 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 ⁇ y ⁇ tem is maintained at the present state and returns to the initial operation at step 234.
- step 236 If the opening demand ⁇ ignal i ⁇ exi ⁇ ted, the opening ⁇ ignal i ⁇ applied through the inputting/outputting portion 45 to the opening operation portion 46, ⁇ o that the trip coil 48 opens the ⁇ witch 50 to be under the open-to-lockout at step 235. If the non-voltage i ⁇ checked at ⁇ tep 232, it i ⁇ determined at step 236 whether the inputting ⁇ ignal for the opening i ⁇ required. If the opening demand ⁇ ignal i ⁇ exi ⁇ ted, 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 ⁇ tate at step 238.
- step 240 it is determined at step 240 whether the opening demand ⁇ ignal i ⁇ exi ⁇ ted by u ⁇ er ⁇ . If the opening demand ⁇ ignal i ⁇ exi ⁇ ted, ⁇ tep 240 returns to the initial operation. If the opening demand ⁇ ignal i ⁇ not exi ⁇ ted, it i ⁇ determined at ⁇ tep 241 whether the counting of the returning timer i ⁇ terminated. If the counting of the returning timer i ⁇ terminated, it i ⁇ judged that the failure is removed, ⁇ tep 241 returns to the initial operation in order to maintain the ⁇ y ⁇ tem at the normal state.
- step 242 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.
- step 245 it is determined at step 245 whether the voltage i ⁇ detected. If the voltage detecting portion 40 detects the voltage, the ⁇ ection throwing check ⁇ tate i ⁇ made at step 246, by which the throw timer is ⁇ et/di ⁇ played 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 i ⁇ not the failure in front of the ⁇ witch, the throwing signal is applied through the inputting/outputting portion 45 to the throw operating portion 48.
- the ⁇ witch 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 ⁇ ource on the load to prevent the collision of the both power source) .
- the pos ⁇ ibility of the non-voltage detection i ⁇ checked at ⁇ tep 251 until the timer i ⁇ terminated. If the throwing timer i ⁇ terminated, the front timer is ⁇ et 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, as ⁇ uming that the failure in front of the timer happen, the ⁇ witch 50 i ⁇ opened to be in the lock-out- at-open ⁇ tate at ⁇ tep 254. Before the timer i ⁇ out of order, it i ⁇ determined at ⁇ tep 255 whether the voltage is detected.
- the ⁇ ection throwing check ⁇ tate i ⁇ made to return to step 246. It is identified at ⁇ tep 249 that there i ⁇ not the front failure. It i ⁇ determined at step 256 whether the back timer is out of order during the identifying of the rear failure. If the timer i ⁇ out of order, a ⁇ uming that there i ⁇ not a failure in the rear ⁇ ide, the ⁇ ystem is converted into the ⁇ ection 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.
- 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.
- 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 ⁇ ignal is inputted. If the throwing ⁇ ignal is inputted, it i ⁇ converted into the ⁇ ection normal state and the sy ⁇ tem return ⁇ to the initial operation.
- Fig. 14 ⁇ how ⁇ the operation procedure ⁇ of the ⁇ tate that the line ⁇ witch of the invention is ⁇ et a ⁇ a tie. At the normal ⁇ tate that the ⁇ witch 50 i ⁇ opened, it is determined at step 261 whether the throwing signal is inputted by u ⁇ ers.
- the pha ⁇ e i ⁇ identified at step 262 with the phase information calculated by the line voltage information.
- the throwing coil 49 is operated by the ⁇ ignal from the throw operating portion 47 to throw the ⁇ witch 50, the ⁇ witch 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.
- the normal tie ⁇ tate i ⁇ maintained a ⁇ if the throwing signal i ⁇ ignored and the ⁇ y ⁇ tem return ⁇ to the initial operation. If the non-voltage is detected at ⁇ tep 264, it i ⁇ determined at step 265 whether the voltage from the voltage detecting portion 40 i ⁇ detected. If the voltage i ⁇ not detected, it is judged as the non-voltage state, if the voltage is detected, the returning timer is operated to convert the ⁇ ystem into the tie returning identification state recognizing the voltage for the predetermined displaying time at step 266.
- step 267 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 i ⁇ thrown by the throwing coil 49 to be made into the tie clo ⁇ e-to-lock-out ⁇ tate at ⁇ tep 271.
- the timer i ⁇ it i ⁇ determined at ⁇ tep 272 whether the voltage i ⁇ detected by the voltage detecting portion 40. If the voltage i ⁇ detected, a ⁇ uming that the front failure occurs, the front timer is set at step 273, and the operation of the throwing timer ⁇ tops to be converted into the tie front failure identification ⁇ tate for the front failure identification at ⁇ tep 274.
- ⁇ tep 275 It i ⁇ determined at ⁇ tep 275 whether the front timer is out of order. If the front timer i ⁇ out of order, the normal tie ⁇ tate i ⁇ ⁇ et at ⁇ tep 273, and the ⁇ ystem returns to the initial operation state. If the front timer is not out of order, it is determined at ⁇ tep 276 whether the non-voltage is detected. If the non-voltage i ⁇ detected, a ⁇ uming that the front failure occur ⁇ , the switch 50 is locked out to be made into the lock-out-at- open ⁇ tate with being not thrown. It is determined at ⁇ tep 277 whether the re ⁇ etting ⁇ ignal i ⁇ inputted by u ⁇ ers.
- the control flag data of the control sy ⁇ tem i ⁇ 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.
- the power di ⁇ tribution line ⁇ witch method and the power di ⁇ tribution line ⁇ witch control ⁇ ystem according to the invention co-operate with a recloser or a circuit breaker of a back up device, divides the ⁇ ection into parts at maximum even in any line operation manner, ⁇ implifie ⁇ the correction and facilitate ⁇ its use. Al ⁇ o, the unnece ⁇ ary power failure and operation are not repeated, and the good ⁇ ervice will be expected by the economic and rapid line recovery.
- the invention provide ⁇ the enhanced co-operation capability for removing the tran ⁇ ient failure and methods for resolving problems of the algorithm processing of a line ⁇ witch control which appear ⁇ a ⁇ di ⁇ advantage of a power line carrier ⁇ y ⁇ tem for a power di ⁇ tribution automation, by which only the failure section is divided into parts and the recovery of the good line is automatically resolved.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU76247/94A AU7624794A (en) | 1993-09-04 | 1994-09-05 | Power distribution line switching method and control system therefor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930017730A KR960013533B1 (en) | 1993-09-04 | 1993-09-04 | Method and apparatus of opening/closing a circuit-breaker and a recloser |
KR1993/17730 | 1993-09-04 | ||
KR1994/20773 | 1994-08-23 | ||
KR1019940020773A KR0124040B1 (en) | 1994-08-23 | 1994-08-23 | Distribution line on/off system & line switch control apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995007569A1 true WO1995007569A1 (en) | 1995-03-16 |
Family
ID=26629871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR1994/000119 WO1995007569A1 (en) | 1993-09-04 | 1994-09-05 | Power distribution line switching method and control system therefor |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU7624794A (en) |
WO (1) | WO1995007569A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2425651A1 (en) * | 1973-05-29 | 1974-12-19 | Westinghouse Electric Corp | PROTECTIVE RELAY DEVICE FOR ELECTRIC ENERGY TRANSMISSION LINES |
DE2435615A1 (en) * | 1973-11-23 | 1975-06-05 | Zellweger Uster Ag | METHOD AND DEVICE FOR THE AUTOMATIC DISCONNECTION OF A DAMAGED LINE OF A CABLE TRAIN OF AN ELECTRICAL POWER SUPPLY NETWORK |
GB1537841A (en) * | 1974-11-22 | 1979-01-04 | Sprecher & Schuh Ag | System for switching out a short-circuited section from a closed electrical ring distribution system |
GB1589604A (en) * | 1976-06-09 | 1981-05-13 | Westinghouse Electric Corp | Alternating current power distribution network with apparatus for detecting ground faults |
DE4027919A1 (en) * | 1990-09-03 | 1992-03-05 | Siemens Ag | Energy supply network line section disconnection system - uses comparison of current phase signals to control disconnection switch |
EP0554553A2 (en) * | 1991-12-16 | 1993-08-11 | Kabushiki Kaisha Toshiba | Method of and system for disconnecting faulty distribution line section from power distribution line |
-
1994
- 1994-09-05 WO PCT/KR1994/000119 patent/WO1995007569A1/en active Application Filing
- 1994-09-05 AU AU76247/94A patent/AU7624794A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2425651A1 (en) * | 1973-05-29 | 1974-12-19 | Westinghouse Electric Corp | PROTECTIVE RELAY DEVICE FOR ELECTRIC ENERGY TRANSMISSION LINES |
DE2435615A1 (en) * | 1973-11-23 | 1975-06-05 | Zellweger Uster Ag | METHOD AND DEVICE FOR THE AUTOMATIC DISCONNECTION OF A DAMAGED LINE OF A CABLE TRAIN OF AN ELECTRICAL POWER SUPPLY NETWORK |
GB1537841A (en) * | 1974-11-22 | 1979-01-04 | Sprecher & Schuh Ag | System for switching out a short-circuited section from a closed electrical ring distribution system |
GB1589604A (en) * | 1976-06-09 | 1981-05-13 | Westinghouse Electric Corp | Alternating current power distribution network with apparatus for detecting ground faults |
DE4027919A1 (en) * | 1990-09-03 | 1992-03-05 | Siemens Ag | Energy supply network line section disconnection system - uses comparison of current phase signals to control disconnection switch |
EP0554553A2 (en) * | 1991-12-16 | 1993-08-11 | Kabushiki Kaisha Toshiba | Method of and system for disconnecting faulty distribution line section from power distribution line |
Also Published As
Publication number | Publication date |
---|---|
AU7624794A (en) | 1995-03-27 |
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