CN201156680Y - Automatic throw-in equipment of adaptive standby power supply - Google Patents

Abstract

The utility model discloses an automatic feed-in device of a self-adaptation standby power which includes a conditioning circuit board; the secondary sides of PT and CT are connected with the conditioning circuit board, an A/D switching module and a digital logic processor in turn; a breaker position switch is connected with the I/O ports of a core control plate as well as the digital logic processor in turn; the output end of the digital logic processor is respectively connected with a communication interface and an external interface. The output end of the communication interface is connected with a human-computer interface. The automatic feed-in device of a self-adaptation standby power has the characteristics of high switching quality, high adaptation, high reliability and friendly human-computer interface.

Description

The self adaptation automatic throw-in equipment of emergency power supply

Technical field

The utility model belongs to the control device technical field of power transmission and distribution device, relates to a kind of multifunctional adaptive automatic throw-in equipment of emergency power supply.

Background technology

Automatic throw-in equipment of emergency power supply is as a kind of automatic safety device commonly used in the electric power system, and it develops the same electromagnetism (rectification) type that passed through---four Main Stage such as crystal type---integrated circuit type---microcomputer type etc. with protective relaying device.Study carefully its essence, the difference of the major technique in each stage is on the implementation to the compute mode of collection capacity (magnitude of current, voltage, switching value) and logic function.The electromagnetic type backup auto-activating device is still being brought into play very big effect at present in operation of power networks.But, cause switch to switch poor quality because its logical condition all is made of relay; Mode of operation ossifys, variation that can not the adaptive system operational mode; The relay element of realizing control procedure is more, and reliable in action is low, and it is big to take up room, and safeguards complexity, the cost height; Can not realize Long-distance Control.Comparatively speaking, the system controlled by computer type backup auto-activating device above-mentioned many shortcomings of then having forgone.But the microcomputer automatic throw-in equipment of emergency power supply that has come into operation at present still adopts traditional criterion, does not have extensive adaptability, and stand-by power supply input success rate is low, and reliability is difficult to guarantee.

Summary of the invention

The purpose of this utility model provides a kind of reliability height, has extensively adaptive a kind of multifunctional adaptive automatic throw-in equipment of emergency power supply.

The technical scheme that the utility model adopted is, a kind of multifunctional adaptive automatic throw-in equipment of emergency power supply, comprise the modulate circuit plate, PT, CT secondary side join with modulate circuit plate, A/D modular converter, digital signal processor DSP successively, the circuit breaker position switch joins with I/O mouth, the digital signal processor DSP of core control board successively, the output of digital signal processor DSP joins with communication interface, external interface respectively, and the output and the man-machine interface of communication interface are joined.The PT of PT, CT secondary side is output as 0～100V, and CT is output as 0～5A.External interface is a RS-232 interface.

The utility model is different from the characteristics of other type backup auto-activating device:

1, device switches the quality height.Adopt software flow that the prepared auto restart logic is controlled, and have the software fault measuring ability.Successfully drop into process time from each switching value, analog acquisition to stand-by power supply short, and the efficient height has guaranteed under the special occasions requirement to power supply reliability.

2, device adaptability is strong.A plurality of independently working methods can reflect multiple different prepared auto restart mode, by adjusting voluntarily, no matter be the various main electrical scheme forms of transformer station, still urban distribution network opens and closes desired various power supply plan, or the high and low pressure of large user's electricity consumption cooperates, and can both be met the requirement of prepared auto restart function.

3, device reliability height.Device is provided with quick switching, the same period catches switching and low pressure is switched a plurality of stand-by power supply automatic switching modes.At stand-by power supply lead-in circuit breaker closing moment, adopt successively fast switch, catch and switch and low pressure is switched main switching mode, reserve switching mode and the reserve switching mode of switching as stand-by power supply far away the same period, guarantees the successful switch of stand-by power supply.

4, device man-machine interface close friend, communication mode is flexible.All can utilize the interior local communication network in man-machine interface plug-in unit tissue station to communicate by letter under any occasion with extraneous.Except the liquid crystal display control flow is arranged, also have RS-232 interface on the panel, be used to connect outer PC, be convenient to the debugging and the operation maintenance of equipment.

Description of drawings

Fig. 1 is the general structure block diagram of the utility model system;

Fig. 2 is the different working modes workflow diagram of the utility model embodiment, and a is normal manually switch operating flow process, b be undesired or the accident pattern under the switch operating flow process;

Fig. 3 is the utility model workflow diagram.

Among the figure, 1. core control board, 2. modulate circuit plate, 3. man-machine interface, 4.PT, CT secondary side, 5.A/D modular converter, 6. digital signal processor DSP, 7. circuit breaker position switch, 8. the I/O mouth of core control board, 9. communication interface, 10. external interface.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

As shown in Figure 1, self adaptation automatic throw-in equipment of emergency power supply of the present utility model, PT, CT secondary side 4 join with modulate circuit plate 2, A/D modular converter 5, digital signal processor DSP 6 successively, circuit breaker position switch 7 joins with I/O mouth 8, the digital signal processor DSP 6 of core control board successively, the output of digital signal processor DSP 6 joins with communication interface 9, external interface 10 respectively, and the output of communication interface 9 and man-machine interface 3 are joined.

Wherein, voltage, electric current AC signal are taken from PT, CT secondary side 4, PT is output as 0～100V, CT is output as 0～5A, AC signal inserts modulate circuit plate 2, through behind the limit filtration, the AC signal of supplied with digital signal processor DSP6 is limited to-1.5V～+ 1.5V between, become the binary number that digital signal processor DSP 6 can be discerned by A/D modular converter 5 then, systems soft ware is converted into the decimal number line data of going forward side by side again and handles.Circuit breaker position switch 7 is gathered the circuit breaker position switching signals by the I/O mouth 8 that relay is directly inputted to the core control board, and systems soft ware comes the running status of automatic tracking system by the switching value of gathering, and is presented on the man-machine interface 3 by communication interface 9.External interface 10 is a RS-232 interface, is used to connect outer PC, is convenient to the debugging and the operation maintenance of equipment, under any circumstance, as long as use PC that carries and the function software that adapts, just can pass through interface interchange data or modifier setting parameter.

Present automatic throw-in equipment of emergency power supply mostly adopts traditional combined floodgate criterion, promptly when decompression bus residual voltage reduce to rated voltage 20%～40% the time outlet action of closing a floodgate.Though this method surge voltage when dropping into is less, safe and reliable, busbar voltage is low excessively, for station service, can make the motor that is attached on the bus because of the brownout stall, causes station-service power to disappear, and can make generator outage when serious.Be exactly to adopt quick switching mode in addition, the phase angle difference when promptly stand-by power supply drops into is the smaller the better, though generally drop into during in big residual voltage 30 ° of this methods, surge voltage is less, very favourable to the motor self-starting, but very high to the switch speed requirement, success rate is low during enforcement.

For above-mentioned technical problem, the utility model device adopts three kinds of novel criterions that switching mode combines, be about to switch fast, catch to switch with low pressure and switch the same period, as main switching mode, reserve switching mode and reserve switching mode far away, detailed process is as follows respectively:

In working power accident conditions and abnormal conditions appear and behind the tripping circuit breaker, automatic throw-in equipment of emergency power supply starts the closing operation that carries out stand-by power supply immediately.Device at first adopts quick switching mode according to software flow.Because combined floodgate circuit breaker both sides are backup power source voltage and bus residual voltage, can regard as with former working power voltage synchronous, and phase angle difference need be limited in 1.1 times of ranges of nominal tension 0～20 ° of main size of considering to be applied to the beat voltage on the station-service asynchronous motor.In the vector triangle that backup power source voltage, bus residual voltage and beat voltage constitute, utilize the cosine law can solve the span of phase angle difference between backup power source voltage in the time of can carrying out closing operation and the bus residual voltage.When the criterion of closing a floodgate was calculated, directly the phase difference and the set point of backup power source voltage that will calculate in real time and bus residual voltage were made comparisons, as long as phase difference, can send the order of closing a floodgate less than set point.

When because some odjective causes, originally just there is a bigger initial phase angle such as backup power source voltage and busbar voltage, perhaps the switchgear self-condition is limit etc., quick switching makes when can not satisfy condition, catch the same period just to switch and switch as the reserve of switching fast, at this moment device changes over to automatically and differentiates the same period, and making service power switch can carry out safely.As the combined floodgate target, considered the breaker closing time equally when the same period, the seizure switching was 0 ° with phase difference, using closes a floodgate adjusts pre-set time, and the size of lead depends on the pace of change of closing circuit time and phase difference.

When the bus residual voltage is lower than maximumly when allowing residual voltage, only need the pre-set maximum residual voltage definite value that allows, can be according to the low pressure transfer criterion, allow to send and close the auxiliaries-supply circuit-breaker order.Low pressure is switched as switching fast and catching the reserve of switching the same period and switch, and promptly switches can not normally carry out the time when switching fast for some reason with catching the same period, is switched by low pressure and finishes the work, and guarantees the reliable input of stand-by power supply.

This device is applicable to that the stand-by power supply of power plant station service and transformer station drops into automatically, and its electric pressure scope is 400V～110kVAC.This device has normal manual switchover, accident automaticallyes switch and three kinds of mode of operations of abnormal conditions automatic switchover.

During normal manual switchover, by operations staff's manual operation starting, apparatus for fast switching carries out breaking-closing operating by the manual switchover mode of setting in advance (parallel connection).Shown in a among Fig. 2, after the staff starts automatic throw-in equipment of emergency power supply by normal manual switching push button, backup auto-activating device carries out parallel connection to stand-by power supply and switches, promptly at first treat combined floodgate circuit breaker both sides and carry out the automatic self synchronizing combined floodgate, if close a floodgate successfully, just disconnect the working power lead-in circuit breaker, finish normal manually handover operation and to the man-machine interface demonstration of posting a letter; If close a floodgate for the first time failure, wait for that then the arrival of next time closing a floodgate opportunity carries out closing operation again.

Accident automaticallyes switch, and is started by the protection contact, when sending out change group, factory's change and other protection outlet jumping working power switch, starts fast cutting apparatus and switches, and fast cutting apparatus is pressed the automatic switching mode of setting in advance (series connection) and carried out breaking-closing operating.

Abnormal conditions automaticallyes switch, and two kinds of abnormal conditions are arranged.The one, bus loss of pressure, after busbar voltage is lower than the voltage of adjusting and reaches the time-delay of adjusting, device starting, and switch by automated manner.The 2nd, the working power switch mis-jumping, by operating switch auxiliary contact starting device, stand-by power supply closes when switching condition satisfies.

Shown in b among Fig. 2, automatically switch and abnormal conditions automaticallyes switch under two kinds of patterns in accident, backup auto-activating device is by protection contact point signal or abnormal conditions signal enabling, and carries out series system and switch.Tripping operation back device is handled the result who obtains according to analog quantity and is judged whether to send the order of closing a floodgate according to active and standby combined floodgate criterion successively.After the combined floodgate condition satisfies, by switching value I/O mouth output switching signal, output to the closing circuit of circuit breaker after switching signal amplifies signal through auxiliary relay, its status signal is then returned in the breaker closing success to be made the involution of combined floodgate output command and is presented at human-computer interaction interface.If fast butt formula is closed a floodgate unsuccessful, then migrate and catch switching mode the same period, catch that switching mode is still unsuccessful just to adopt the low pressure switching mode same period, guarantee the successful input of stand-by power supply.

Be illustrated in figure 3 as the work main flow chart.After device powers on or resets, system is carried out a series of initialization, promptly hardware such as core controller dsp chip, A/D module and flag bit, counter etc. are carried out initialization, judge the current operational mode of system according to the switching value that captures then.Whether operational mode assigns instruction by communication check HMI plate after determining, has the instruction of then the HMI plate being assigned to handle and return result; Do not have then to adopt into analog quantity calculate, and judged whether unusual or failure condition takes place, if having then carry out the automatic input of stand-by power supply according to each mode of operation by result of calculation; Then result of calculation not being returned to man-machine interface shows.The back system that disposes continues to judge current operational mode, down carries out according to flow process.

This device adopts RS-232 communication protocol, and in integrated automation converting station, the interface in the man-machine interface plug-in unit can be networked with the automated network in the station; If in non-comprehensive automation station, can be connected into the independent communication net to all equipment that possess human-machine interface function in the station, manage and shared peripheral hardware (printing device and engineer station) the regional area realization automation in the station concentratedly.In case transformer station carries out the comprehensive automation transformation, include the independent communication net in full station comprehensive automation network and carry out agreement and " shake hands ", just can make full use of existing equipment and reach higher requirement.

Claims (3)

1, a kind of self adaptation automatic throw-in equipment of emergency power supply, comprise modulate circuit plate (2), modulate circuit plate (2) successively with core control board (1), man-machine interface (3) is joined, it is characterized in that, PT, CT secondary side (4) successively with modulate circuit plate (2), A/D modular converter (5), digital logical processor DSP (6) joins, circuit breaker position switch (7) successively with the I/O (8) of core control board, digital signal processor DSP (6) joins, the output of digital signal processor DSP (6) respectively with communication interface (9), external interface (10) joins, and the output of communication interface (9) and man-machine interface (3) are joined.

2, device according to claim 1 is characterized in that, the PT of described PT, CT secondary side (4) is output as 0～100V, and CT is output as 0～5A.

3, device according to claim 1 is characterized in that, described external interface (10) is a RS-232 interface.

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