CN104993388B - PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device - Google Patents
PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device Download PDFInfo
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Abstract
The invention discloses a PT (Potential Transformer) paralleling device applied to a transformer substation and a voltage fault automatic identification method for the PT paralleling device. The PT paralleling device comprises a CPU and switch-input and switch-output unit, a voltage collection unit, a relay unit and a man-machine interaction unit. The CPU and switch-input and switch-output unit comprises a switch-input module, a switch-output module and a CPU module. The switch-input module comprises multiple paths of switch-input quantity connection terminals connected with switch-input ends of the CPU module, and the multiple paths of switch-input quantity connection terminals comprise a switch-input quantity connection terminal 1PTG, a switch-input quantity connection terminal 2PTG and a switch-input quantity connection terminal FD. The method comprises the step of identifying various voltage fault types according to phase voltage amplitudes of three phases before PT transformation and zero sequence voltage after PT transformation. The PT paralleling device has a voltage sampling and displaying function, can conveniently and timely monitor the operation state of a voltage loop of the transformer substation, and improves the fault processing efficiency; and the voltage fault automatic identification method can further achieves fault automatic identification, and has advantages of accurate and reliable fault diagnosis and fast diagnosis speed.
Description
Technical field
The present invention relates to transformer substation voltage control device fault detection technique, and in particular to a kind of PT for transformer station is simultaneously
Array apparatus and its voltage failure automatic distinguishing method.
Background technology
Traditional substation PT parallel device（Voltage-operated device）It is made up of with reference to external circuit relay element, it is right to realize
Transformer substation voltage transformer secondary（It is secondary）The control of output voltage and two sections of buses（Bus I and bus II）The switching of voltage.
The bus I and bus II of traditional substation PT parallel device respectively comes with independent voltage transformer, the outdoor bus of transformer station
Section switch DL and both sides disconnecting link auxiliary contact 1G, 2G, and relay arranged side by side between bus I and bus II, is provided between bus
BLJ5.But, traditional substation PT parallel device does not have function displaying voltage, it is impossible to secondary voltage reversely charging when preventing PT arranged side by side
Electricity, it is impossible to monitor transformer substation voltage loop running status in real time, when electric voltage exception, need to pass through manual measurement and analysis, with true
Determine failure cause, affect troubleshooting efficiency；And this kind of device have failure automatic discrimination function, carry out fault distinguishing according to
Bad artificial experience judges that degree of accuracy is not high judging, and inefficiency.
The content of the invention
The technical problem to be solved in the present invention：For the drawbacks described above of prior art, there is provided one kind possess voltage sample and
Display function, the convenient loop of monitoring transformer substation voltage in real time running status, it is possible to increase troubleshooting efficiency for transformer station
PT parallel devices, and this be used for transformer station PT parallel devices on the basis of, there is provided one kind can realize failure from
The voltage failure automatic discrimination of the fast PT parallel devices for transformer station of dynamic differentiation, the accurate reliable, diagnosis speed of fault diagnosis
Method.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of PT parallel devices for transformer station, it is characterised in that：Including CPU and input and output unit, voltage acquisition
Unit, relay unit and man-machine interaction unit, the CPU and input and output unit include opening into module, output module and CPU
Module, described opening include opening with CPU module respectively the multichannel intake connection terminal being connected into end into module, the multichannel open into
Amount connection terminal be connected with man-machine interaction unit, the multichannel intake connection terminal include intake connection terminal 1PTG,
Intake connection terminal 2PTG and intake connection terminal FD, the voltage of the intake connection terminal 1PTG and bus I are mutual
Sensor is connected every knife auxiliary contact, and the voltage transformer of the intake connection terminal 2PTG and bus II is every knife auxiliary contact phase
Even, the intake connection terminal FD is connected with the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station；Institute
The end of outputing for stating CPU module is connected with relay unit by outputing module, and the man-machine interaction unit is connected with CPU module,
The input of the voltage acquisition unit is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, described
The outfan of voltage acquisition unit is connected with the input of CPU module.
Preferably, the voltage acquisition unit includes 7 relays arranged side by side and 14 voltage collection circuits, and described 14 electric
Pressure Acquisition Circuit includes I mother's A phase voltages Acquisition Circuit A602, I mother's B phase voltages Acquisition Circuit B602, I mother C phase voltages collection electricity
Road C602, I mother's residual voltage connection end L602, I mother's A phase metered voltages Acquisition Circuit A602J, I mother's B phases metered voltage collection electricity
Road B602J, I mother C phase metered voltages Acquisition Circuit C602J, II mother's A phase voltages Acquisition Circuit A604, II mother B phase voltage collection electricity
Road B604, II mother's C phase voltages Acquisition Circuit C604, II mother's residual voltage connection end L604, II mother's A phase metered voltage Acquisition Circuit
A604J, II mother's B phase metered voltages Acquisition Circuit B604J, II mother's C phase metered voltage Acquisition Circuit C604J, the I mothers A phases are electric
Pressure Acquisition Circuit A602 and II mother's A phase voltage Acquisition Circuit A604 are exported after being commonly connected to a relay arranged side by side, and the I is female
B phase voltages Acquisition Circuit B602 and II mother's B phase voltage Acquisition Circuit B604 are exported after being commonly connected to a relay arranged side by side, institute
State I mother's C phase voltages Acquisition Circuit C602 and II mother's C phase voltage Acquisition Circuit C604 be commonly connected to it is defeated after a relay arranged side by side
Go out, the I mothers residual voltage connection end L602 and II mother residual voltage connection end L604 is commonly connected to a relay arranged side by side
After export, I mother A phase metered voltage Acquisition Circuit A602J and II mother's A phase metered voltage Acquisition Circuit A604J connect jointly
Export to a relay arranged side by side, I mother B phase metered voltage Acquisition Circuit B602J and the collection of II mother's B phases metered voltage are electric
Road B604J is commonly connected to output, I mother C phase metered voltage Acquisition Circuit C602J and II mother C after a relay arranged side by side
Phase metered voltage Acquisition Circuit C604J is exported after being commonly connected to a relay arranged side by side.
Preferably, the voltage acquisition unit also includes 14 weight motor type relays and 21 fast recovery critesistor, described
A weight motor type relay is connected in series between 14 voltage collection circuits and relay arranged side by side respectively, in the voltage acquisition unit
14 weight motor type relays and 7 relays arranged side by side be in series with one and fast recover critesistor.
Preferably, the multichannel intake connection terminal also include outside between involution connection terminal FGK and bus it is arranged side by side after
Electrical equipment connection terminal BL5, between the bus between relay connection terminal BL5 arranged side by side and the bus I and bus II of transformer station
Between bus, the auxiliary contact of relay BLJ5 arranged side by side are connected；The relay unit includes the relay for control bus I inputs
Device 1PT, for control bus II input relay 2PT, the relay 1VFJ for exporting bus I fault-signals, for defeated
Go out the relay 2VFJ of bus II fault-signals, the relay GJ for output device warning signal, for output device locking
The relay BSJ of signal, the relay BL for exporting output signal arranged side by side, the relay 1PT, relay 2PT, relay
1VFJ, relay 2VFJ, relay GJ, relay BSJ, relay BL are connected with the end of outputing of CPU module respectively, the relay
Device BL is parallel with LED 1, and the relay GJ is parallel with LED 2.
Based on the technical scheme of the PT parallel devices provided by the present invention for transformer station, the present invention is also further carried
For a kind of voltage failure automatic distinguishing method of the PT parallel devices for transformer station, step includes：
1）For each bus being previously used in the PT parallel devices of transformer station, detect that the voltage of the bus is mutual first
Sensor redirects execution step 3 every cutter position if voltage transformer is set to conjunction position every cutter spacing）；Else if voltage transformer
A point position is set to every cutter spacing, then redirects execution step 2）；
2）Judge the position of the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station, if outdoor bus
The position of section switch and both sides disconnecting link auxiliary contact is a point position, then redirect again execution step 1）；If outdoor bus point
The position of section chopper and both sides disconnecting link auxiliary contact then redirects execution step 3 to close position）；
3）Obtaining the bus carries out the phase voltage amplitude of any one phase in front A, B, C three-phase of PT switchingsU X1And remaining is biphase
Phase voltage amplitudeU X2WithU X3, obtain the residual voltage after the bus carries out PT switchingsU L1 ；
4）For the phase voltage amplitude of any one phaseU X1：Judge phase voltage amplitudeU X1In default first voltage threshold zone
It is interior whether to set up, phase voltage amplitude is judged if setting upU X1Normally, otherwise judge phase voltage amplitudeU X1It is abnormal；Judge phase
Voltage magnitudeU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 Less than default second voltage threshold
Whether two conditions of value are set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The air switch tripping operation of correspondence phase secondary voltage；
Judge phase voltage amplitudeU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 More than the default 3rd
Voltage threshold, voltage magnitudeU X2More than default tertiary voltage threshold value, voltage magnitudeU X3More than default tertiary voltage threshold value four
Whether individual condition is set up simultaneously, if while phase voltage amplitude is judged if setting upU X1Correspondence phase busbar grounding；Judge phase voltage width
ValueU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 It is interval positioned at default 4th voltage threshold
Whether interior two conditions are set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The high-voltage insurance fusing of correspondence phase.
Preferably, the step 2）During the position of middle judgement outdoor bus section breaker and both sides disconnecting link auxiliary contact,
Specifically refer to outdoor bus section breaker DL, the auxiliary contact every knife 1G of section switch DL sides, section switch
The auxiliary contact every knife 2G of DL opposite sides are connected in series, if outdoor bus section breaker DL, section switch DL sides
The auxiliary contact every knife 1G, the auxiliary contact every knife 2G of section switch DL opposite sides simultaneously in position is closed, then judge room
The position of outer bus section breaker and both sides disconnecting link auxiliary contact judges outdoor bus section breaker and two to close position, otherwise
The position of side tool lock auxiliary contact is a point position.
Preferably, the step 4）In default first voltage threshold interval be 50V to 65V between, second voltage threshold
It is worth for 20V, tertiary voltage threshold value is 80V, the 4th voltage threshold is interval between 25V to 40V.
The present invention is had the advantage that for the PT parallel devices tool of transformer station：PT parallel device of the present invention for transformer station
Including CPU and input and output unit, voltage acquisition unit, relay unit and man-machine interaction unit, CPU and input and output unit
Including opening into module, outputing module and CPU module, open into module include opening with CPU module respectively into the multichannel that end is connected open into
Amount connection terminal, multichannel intake connection terminal is connected with man-machine interaction unit, multichannel intake connection terminal include opening into
Amount connection terminal 1PTG, intake connection terminal 2PTG and intake connection terminal FD, can gather bus I and bus respectively
The voltage transformer of II every knife auxiliary contact and the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station, together
When voltage acquisition unit input respectively it is each with A, B, C of bus I and bus II mutually and open-triangular winding is connected, possess electricity
Pressure sampling and display function, the convenient loop of monitoring transformer substation voltage in real time running status, it is possible to increase troubleshooting efficiency, and
When institute's collection voltages are abnormal, corresponding warning information controlled can be sent, point out O＆M maintainer to process, so as to shorten to event
The lookup of barrier and process time.
The present invention is had the advantage that for the voltage failure automatic distinguishing method tool of the PT parallel devices of transformer station：The present invention
For transformer station PT parallel devices voltage failure automatic distinguishing method for being previously used in the PT parallel devices of transformer station
Each bus, detect the voltage transformer of the bus every cutter position, if voltage transformer every cutter spacing be set to conjunction position, or
If voltage transformer is set to the position of point position and outdoor bus section breaker and both sides disconnecting link auxiliary contact to close every cutter spacing
During position, obtaining bus carries out the phase voltage amplitude of any one phase in front A, B, C three-phase of PT switchingsU X1And remaining biphase mutually electricity
Pressure amplitude valueU X2WithU X3, obtain the residual voltage after the bus carries out PT switchingsU L1 , according to the above-mentioned voltage of collection, can be respectively
Differentiate the phase voltage amplitude of any one phase of A, B, C in PT the parallel device median generatrix I and bus II of transformer stationU X1Abnormal conditions, phase
Voltage magnitudeU X1Correspondence phase secondary voltage air switch trip condition, phase voltage amplitudeU X1Correspondence phase busbar grounding situation, phase voltage width
ValueU X1Correspondence phase high-voltage insurance fusing situation, has the advantages that the accurate reliable, diagnosis speed of fault diagnosis is fast.
Description of the drawings
Structural representations of the Fig. 1 for embodiment of the present invention PT parallel device.
Fig. 2 is the structural representation of CPU and input and output unit in the embodiment of the present invention.
Fig. 3 is the access point circuit principle schematic of voltage acquisition unit in the embodiment of the present invention.
Fig. 4 is the voltage collection circuit principle schematic in the embodiment of the present invention.
Job step schematic flow sheets of the Fig. 5 for embodiment of the present invention PT parallel device.
The step of Fig. 6 is embodiment of the present invention voltage failure automatic distinguishing method schematic flow sheet.
Specific embodiment
As shown in Figure 1, Figure 2 and Figure 3, the present embodiment includes CPU and input and output list for the PT parallel devices of transformer station
Unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4, CPU and input and output unit 1 include opening into module
11st, module 12 and CPU module 13 are outputed, open includes opening with CPU module 13 respectively the multichannel intake being connected into end into module 11
Connection terminal, multichannel intake connection terminal are connected with man-machine interaction unit 4, and multichannel intake connection terminal includes intake
Connection terminal 1PTG, intake connection terminal 2PTG and intake connection terminal FD, intake connection terminal 1PTG and bus I
Voltage transformer be connected every knife auxiliary contact, the voltage transformer of intake connection terminal 2PTG and bus II is touched every knife auxiliary
Point is connected, and intake connection terminal FD is connected with the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station；CPU
The end of outputing of module 13 is connected with relay unit 3 by outputing module 12, and man-machine interaction unit 4 is connected with CPU module 13, electricity
The input of pressure collecting unit 2 is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, voltage acquisition
The outfan of unit 2 is connected with the input of CPU module 13.
Referring to Fig. 1, the present embodiment is used for the PT parallel devices of transformer station also includes bus board and power supply, power supply, CPU and opens
Enter to output unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4 respectively by bus board realize signal and
Power supply interconnects, on CPU and input and output unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4
It is equipped with and patches connector.It has to be noted that bus board is not the required part for implementing technical solution of the present invention, in addition
Above-mentioned part directly can be connected by cable, and power supply can also adopt independent external form or with transformer station other
Equipment shares power supply, therefore no longer bus board and power supply is further detailed or is described in the present embodiment.
In the present embodiment, CPU module 13 is adopted from STM32f103vft6 as core controller, and the controller is ARM32
Bit CPU, its maximum operation frequency are 72MHz, 1.25DMips/MHZ, with 768K ~ 1M flash memory spaces, with 96KSRAM, its
Sampling channel number up to 16, sampling precision are 12, can fully meet device performance requirement.
As shown in Fig. 2 be altogether provided with 9 tunnel intake connection terminals in the present embodiment, wherein 5 tunnel intake connection terminals are
Use, 4 tunnel intake connection terminals are not used.In the 5 tunnel intake connection terminals for having used, except aforesaid 3 tunnel intake
Outside connection terminal, also including relay connection terminal BL5 arranged side by side between outside involution connection terminal FGK and bus, between bus side by side
The auxiliary contact of relay BLJ5 arranged side by side between the bus between the bus I and bus II of relay connection terminal BL5 and transformer station
It is connected.In the present embodiment, multichannel intake connection terminal and CPU module 13 are opened, many to guarantee
The strong and weak electric signal isolation of road intake, the separation of AC and DC signal, interference free performance are more preferable.Traditional PT of transformer station is simultaneously
Array apparatus（Voltage-operated device）For simple relay control device, function is detected without CPU intakes, it is impossible to when preventing PT arranged side by side
Secondary voltage reverse charge.The PT parallel devices of the present embodiment increased relay arranged side by side between bus to improve counnter attack charge function
Connection terminal BL5, between the bus between bus between relay connection terminal BL5 arranged side by side and the bus I and bus II of transformer station simultaneously
The auxiliary contact of row relay BLJ5 are connected, and can be to carry for the control logic arranged side by side for preventing secondary voltage reversely charging electrification from occurring
For underlying hardware, as any one group of PT of bus I and bus II（Voltage transformer）Put into operation, and bus between arranged side by side relay
When BLJ5 is closed, then need not to sentence in-phase voltage poor for the PT parallel devices of the present embodiment, can be directly arranged side by side；When between bus side by side after
When electrical equipment BLJ5 disconnects, detect whether in-phase voltage difference exceeds setting value by CPU, determine whether PT side by side, so as to anti-
Only secondary voltage reversely charging electrification occurs.
As shown in Fig. 2 relay unit 3 includes putting into for control bus I（Voltage by drive control bus I is mutual
Sensor is realized）Relay 1PT, for control bus II put into（Realized by the voltage transformer of drive control bus II）'s
Relay 2PT, the relay 1VFJ for exporting bus I fault-signals, the relay for exporting bus II fault-signals
2VFJ, the relay GJ for output device warning signal, the relay BSJ for output device block signal, for exporting
The arranged side by side relay BL of output signal, relay 1PT, relay 2PT, relay 1VFJ, relay 2VFJ, relay GJ, after
Electrical equipment BSJ, relay BL are connected with the end of outputing of CPU module 13 respectively, and relay BL is parallel with LED 1, relay
Device GJ is parallel with LED 2.This device portion separately enters, output displacement information can directly show in man-machine interaction unit
Show, 3 driven for emitting lights diode (LED) 1 of relay unit and LED 2 monitor in real time voltage input, juxtaposition, have
It is without exception alarm etc. paired running state, facilitate transformer station's operation maintenance personnel carry out voltage and, off-the-line grid switching operation when check voltage
Once and secondary circuit running status, prevent from causing device damage, protection device malfunction event to occur because of personnel's maloperation.Referring to
Fig. 2, the present embodiment repeat circuit unit 3 also include a duplicate relay.In the present embodiment, relay unit 3 is specifically same
One piece of relay board realizes that to facilitate the socket connection realized with bus board, and each relay is by many 24V voltage relays
Series connection, contact capacity are not less than 5A.
As shown in figure 3, voltage acquisition unit 2 includes 7 relays arranged side by side（BLJ1#1、BLJ1#2、BLJ2#1、BLJ2#2、
BLJ3#1、BLJ3#2、BLJ4#1）With 14 voltage collection circuits, 14 voltage collection circuits include I mother A phase voltages collection electricity
Road A602, I mother's B phase voltages Acquisition Circuit B602, I mother's C phase voltages Acquisition Circuit C602, I mother's residual voltage connection end L602, I
Female A phases metered voltage Acquisition Circuit A602J, I mother B phase metered voltages Acquisition Circuit B602J, I mother's C phase metered voltage Acquisition Circuit
C602J, II mother's A phase voltages Acquisition Circuit A604, II mother's B phase voltages Acquisition Circuit B604, II mother's C phase voltage Acquisition Circuit
L604, II mother's A phase metered voltages Acquisition Circuit A604J, the II mother's B phases metered voltage collection of C604, II mother's residual voltage connection end
Circuit B604J, II mother's C phase metered voltage Acquisition Circuit C604J, I mother's A phase voltages Acquisition Circuit A602 and II mother's A phase voltages are adopted
Collector A604 is commonly connected to output, I mother's B phase voltages Acquisition Circuit B602 and II mother's B phase voltages after a relay arranged side by side
Acquisition Circuit B604 is exported after being commonly connected to a relay arranged side by side, and I mother's C phase voltages Acquisition Circuit C602 is electric with II mother's C phases
Pressure Acquisition Circuit C604 is exported after being commonly connected to a relay arranged side by side, I mother's residual voltages connection end L602 and II mother's zero sequence
Voltage connection L604 is commonly connected to output, I mother A phase metered voltage Acquisition Circuit A602J and II after a relay arranged side by side
Female A phases metered voltage Acquisition Circuit A604J is exported after being commonly connected to a relay arranged side by side, I mother's B phases metered voltage collection electricity
Road B602J and II mother's B phase metered voltage Acquisition Circuit B604J is exported after being commonly connected to a relay arranged side by side, and I mother's C phases are counted
Amount voltage collection circuit C602J and II mother's C phase metered voltage Acquisition Circuit C604J is commonly connected to defeated after a relay arranged side by side
Go out.
As shown in figure 3, voltage acquisition unit 2 is also including 14 weight motor type relays（1PTJ1#1～1PTJ4#1,2PTJ1#1
～2PTJ4#1）It is fast with 21 to recover critesistor PPTC, respectively it is connected in series between 14 voltage collection circuits and relay arranged side by side
There are a weight motor type relay, 14 in voltage acquisition unit 2 weight motor type relay and 7 relays arranged side by side to be in series with one soon
Recover critesistor.Such as I mother's A phase voltage Acquisition Circuit A602 is sequentially connected in series weight motor type relay 1PTJ1#1, a fast recovery heat
One end of relay BLJ1#1 arranged side by side is connected to after quick resistance PPTC；II mother's A phase voltage Acquisition Circuit A604 is sequentially connected in series to be moved again
Relay 2PTJ1#1, one it is fast recover critesistor PPTC and another it is fast recover critesistor PPTC after be connected to side by side after
The other end of electrical equipment BLJ1#1.
As shown in figure 4, the voltage collection circuit in the present embodiment is direct resistive voltage sample circuit, it is main to include adjustment
Current-limiting resistance R22, voltage transformer T9 and sampling resistor 25, wherein voltage transformer T9 select miniature current mode voltage transformer
The external voltage acquisition range of T9, PT parallel device design is 0～120VAC, for ease of the sampling of CPU module 13, voltage acquisition
Circuit need to be down to scope that CPU module 13 can directly sample input voltage using voltage transformer T9.Voltage transformer T9's
Model DL-PT202H1, its specified input current are 2mA, and output-current rating is 2mA, maximum input 10mA, and phase contrast is<
=15 ', the unloaded linearity<=0.1%, operating temperature is -35 DEG C～+70 DEG C, can adjust current-limiting resistance according to detection voltage scope
The size of R22, to meet sampling precision requirement.It should be noted that Fig. 4 is only an example of voltage collection circuit, milli
Without query, those skilled in the art can also adopt other kinds of voltage collection circuit as needed.
As shown in figure 5, the job step of the PT parallel devices of the present embodiment is as follows：
S1）System electrification, 13 self-inspection of CPU module, if normally, the running indicator controlled on man-machine interaction unit 4 is bright, no
The stand by lamp for then controlling on man-machine interaction unit 4 is bright；
S2）Under operation, the intake signal into module 11 is opened in 13 timing detection of CPU module；If intake connects
The value of connecting terminal 1PTG is 1（The voltage transformer closure of bus I）, then transfer bus I voltage outputs；If intake connection end
The value of sub- 2PTG is 1（The voltage transformer closure of bus II）, then transfer bus II voltage outputs；If intake connection terminal
The value of FD is 1（The outdoor bus section breaker DL and both sides disconnecting link 1G, 2G closure of transformer station）, and redirect execution next step；
S3）The value for judging intake connection terminal 1PTG is 1 and the value of intake connection terminal 2PTG is for 1（1PTG=1 &
2PTG=1）Whether set up simultaneously, the in-phase voltage that bus I and bus II is calculated if setting up is poor, when in-phase voltage difference is less than
During 15V, it is 0 to arrange the amount of outputing and allow the value of BL side by side（Relay BL disconnects, LED 1 extinguishes）, otherwise work as homophase
When voltage difference is more than or equal to 15V, execution step S6 is redirected）；If be false, execution next step is redirected；
S4）The value for judging intake connection terminal 1PTG is 1 or the value of intake connection terminal 2PTG is for 1（1PTG=1 or
2PTG=1）Whether set up, if set up, redirect execution step S6）；Execution step S5 is redirected otherwise）；
S5）Whether the intake for judging relay connection terminal BL5 arranged side by side between bus is 1（Relay arranged side by side between bus
BLJ5 closes position）If between bus, the intake of relay connection terminal BL5 arranged side by side is 1, redirects execution step S6）；Otherwise jump
Turn execution step S3）；
S6）It is 1 to arrange the amount of outputing and allow the value of BL side by side（Relay B closures, LED 1 are bright）, it is now controllable
The bus I and bus II of PT parallel devices processed is exported side by side.
It should be noted that also to be provided with output relay BLK arranged side by side in PT parallel devices in the present embodiment, in control
The bus I and bus II of PT parallel devices also needs to output relay arranged side by side in cycle detection PT parallel device before exporting side by side
BLK's opens into state, when output relay BLK arranged side by side open into state be 1 when, then the bus I and bus II of PT parallel devices
Export side by side, otherwise in continuation detection PT parallel devices, output relay BLK's arranged side by side opens into state.Additionally, side by side output after
Electrical equipment BLK is not the essential element of the PT parallel devices of transformer station, and above-mentioned flow process is only the PT of the present embodiment and equips
A kind of method of work example put, in actual application, may increase more relays as needed or select which
His different operation control logic.
As shown in fig. 6, the step of the present embodiment is used for the voltage failure automatic distinguishing method of the PT parallel devices of transformer station
Including：
1）For each bus in the PT parallel devices for transformer station, the bus is detected first（Bus I or bus
II）Voltage transformer every cutter position, if voltage transformer every cutter spacing be set to conjunction position, redirect execution step 3）；Otherwise such as
Fruit voltage transformer is set to a point position every cutter spacing, then redirect execution step 2）；
2）Judge the position of the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station, if outdoor bus
The position of section switch and both sides disconnecting link auxiliary contact is a point position, then redirect again execution step 1）；If outdoor bus point
The position of section chopper and both sides disconnecting link auxiliary contact then redirects execution step 3 to close position）；
3）Obtaining the bus carries out the phase voltage amplitude of any one phase in front A, B, C three-phase of PT switchingsU X1And remaining is biphase
Phase voltage amplitudeU X2WithU X3, obtain the residual voltage after the bus carries out PT switchingsU L1 ；
4）For the phase voltage amplitude of any one phaseU X1：Judge phase voltage amplitudeU X1In default first voltage threshold zone
It is interior whether to set up, phase voltage amplitude is judged if setting upU X1Normally, otherwise judge phase voltage amplitudeU X1It is abnormal；Judge phase
Voltage magnitudeU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 Less than default second voltage threshold
Whether two conditions of value are set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The air switch tripping operation of correspondence phase secondary voltage；
Judge phase voltage amplitudeU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 More than the default 3rd
Voltage threshold, voltage magnitudeU X2More than default tertiary voltage threshold value, voltage magnitudeU X3More than default tertiary voltage threshold value four
Whether individual condition is set up simultaneously, if while phase voltage amplitude is judged if setting upU X1Correspondence phase busbar grounding；Judge phase voltage width
ValueU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 It is interval positioned at default 4th voltage threshold
Whether interior two conditions are set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The high-voltage insurance fusing of correspondence phase.
The present embodiment above-mentioned steps can determine the failure of bus I and bus II respectively：For bus I, step
3）What is obtained is the phase voltage amplitude that bus I carries out any one phase in front A, B, C three-phase of PT switchingsU X1（1）And remaining is biphase
Phase voltage amplitudeU X2（1）WithU X3（1）, obtaining bus I carries out the residual voltage after PT switchingsU L1（1）；For bus II, step
3）What is obtained is the phase voltage amplitude that bus I carries out any one phase in front A, B, C three-phase of PT switchingsU X1（2）And remaining is biphase
Phase voltage amplitudeU X2（2）WithU X3（2）, obtaining bus I carries out the residual voltage after PT switchingsU L1（2）；Will not be described here.This enforcement
Example can differentiate any one phase of A, B, C in PT the parallel device median generatrix I and bus II of transformer station respectively by above-mentioned steps
Phase voltage amplitudeU X1Abnormal conditions, phase voltage amplitudeU X1Correspondence phase secondary voltage air switch trip condition, phase voltage amplitudeU X1Correspondence
Phase busbar grounding situation, phase voltage amplitudeU X1Correspondence phase high-voltage insurance fusing situation, and different failure conditions can be directed to
Can be shown by man-machine interaction unit 4, when bus I is judged as any one fault type in Fig. 6, be driven I
Female voltage failure relay 1VFJ, when bus II is judged as any one fault type in Fig. 6, drives II mother's voltage events
Barrier relay 2VFJ, so as to facilitate monitoring personnel to understand malfunction.
In the present embodiment, step 2）During the position of middle judgement outdoor bus section breaker and both sides disconnecting link auxiliary contact,
Specifically refer to outdoor bus section breaker DL, the auxiliary contact every knife 1G of section switch DL sides, section switch
The auxiliary contact every knife 2G of DL opposite sides are connected in series, if outdoor bus section breaker DL, section switch DL sides
The auxiliary contact every knife 1G, the auxiliary contact every knife 2G of section switch DL opposite sides simultaneously in position is closed, then judge room
The position of outer bus section breaker and both sides disconnecting link auxiliary contact judges outdoor bus section breaker and two to close position, otherwise
The position of side tool lock auxiliary contact is a point position.Which is realized judging outdoor bus section breaker and both sides disconnecting link auxiliary contact
Position needed for circuit structure it is most simple, logical AND module can also be arranged as required in addition come realize by detect judge
The position of outdoor bus section breaker and both sides disconnecting link auxiliary contact.
As shown in fig. 6, step 4 in the present embodiment）In default first voltage threshold interval be between 50V to 65V the
Two voltage thresholds are 20V, and tertiary voltage threshold value is 80V, and it is between 25V to 40V that the 4th voltage threshold is interval.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of PT parallel devices for transformer station, it is characterised in that：Including CPU and input and output unit（1）, voltage acquisition
Unit（2）, relay unit（3）And man-machine interaction unit（4）, the CPU and input and output unit（1）Including opening into module
（11）, output module（12）And CPU module（13）, it is described to open into module（11）Including respectively and CPU module（13）Open into end phase
Multichannel intake connection terminal even, the multichannel intake connection terminal is and man-machine interaction unit（4）It is connected, the multichannel
Intake connection terminal includes intake connection terminal 1PTG, intake connection terminal 2PTG and intake connection terminal FD,
The intake connection terminal 1PTG is connected every knife auxiliary contact with the voltage transformer of bus I, the intake connection terminal
2PTG is connected every knife auxiliary contact with the voltage transformer of bus II, and the outdoor of the intake connection terminal FD and transformer station is female
Line section switch and both sides disconnecting link auxiliary contact are connected；The CPU module（13）Output end by outputing module（12）With
Relay unit（3）It is connected, the man-machine interaction unit（4）And CPU module（13）It is connected, the voltage acquisition unit（2）'s
Input is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, the voltage acquisition unit（2）'s
Outfan and CPU module（13）Input be connected；The multichannel intake connection terminal also includes outside involution connection terminal
Relay connection terminal BL5 arranged side by side between FGK and bus, the mother of relay connection terminal BL5 arranged side by side and transformer station between the bus
Between the bus between line I and bus II, the auxiliary contact of relay BLJ5 arranged side by side are connected；The relay unit（3）Including for
The relay 1PT of control bus I inputs, the relay 2PT for control bus II inputs, for exporting bus I fault-signals
Relay 1VFJ, the relay 2VFJ for exporting bus II fault-signals, for the relay of output device warning signal
GJ, the relay BSJ for output device block signal, the relay BL for exporting output signal arranged side by side, the relay
1PT, relay 2PT, relay 1VFJ, relay 2VFJ, relay GJ, relay BSJ, relay BL respectively with CPU module
（13）Output end be connected, the relay BL is parallel with LED 1, and the relay GJ is parallel with light-emitting diodes
Pipe LED2.
2. PT parallel devices for transformer station according to claim 1, it is characterised in that：The voltage acquisition unit
（2）Including 7 relays arranged side by side and 14 voltage collection circuits, 14 voltage collection circuits include that I mother A phase voltages are gathered
Circuit A602, I mother's B phase voltages Acquisition Circuit B602, I mother's C phase voltages Acquisition Circuit C602, I mother residual voltage connection end L602,
I mother's A phase metered voltages Acquisition Circuit A602J, I mother's B phase metered voltages Acquisition Circuit B602J, I mother's C phases metered voltage collection electricity
Road C602J, II mother's A phase voltages Acquisition Circuit A604, II mother's B phase voltages Acquisition Circuit B604, II mother's C phase voltage Acquisition Circuit
L604, II mother's A phase metered voltages Acquisition Circuit A604J, the II mother's B phases metered voltage collection of C604, II mother's residual voltage connection end
Circuit B604J, II mother's C phase metered voltage Acquisition Circuit C604J, I mother's A phase voltages Acquisition Circuit A602 are electric with II mother's A phases
Pressure Acquisition Circuit A604 is exported after being commonly connected to a relay arranged side by side, and I mother's B phase voltages Acquisition Circuit B602 and II are female
B phase voltage Acquisition Circuit B604 is exported after being commonly connected to a relay arranged side by side, I mothers C phase voltage Acquisition Circuit C602
It is commonly connected to export after a relay arranged side by side with II mother's C phase voltage Acquisition Circuit C604, I mother's residual voltages connection end
L602 and II mother residual voltage connection end L604 are exported after being commonly connected to a relay arranged side by side, the I mothers A phase metered voltages
Acquisition Circuit A602J and II mother's A phase metered voltage Acquisition Circuit A604J are exported after being commonly connected to a relay arranged side by side, institute
State I mother B phase metered voltage Acquisition Circuit B602J and II mother's B phase metered voltage Acquisition Circuit B604J is commonly connected to one side by side
Export after relay, I mother C phase metered voltage Acquisition Circuit C602J and II mother's C phase metered voltages Acquisition Circuit C604J are altogether
Export with being connected to after a relay arranged side by side.
3. PT parallel devices for transformer station according to claim 2, it is characterised in that：The voltage acquisition unit
（2）Also include 14 weight motor type relays and 21 fast recovery critesistor, 14 voltage collection circuits and relay arranged side by side
Between be respectively connected in series with one weight motor type relay, the voltage acquisition unit（2）In 14 weight motor type relays and 7 side by side
Relay is in series with a fast recovery critesistor.
4. a kind of voltage failure automatic distinguishing method of the PT parallel devices for transformer station, it is characterised in that step includes：
1）For described in any one in claims 1 to 3 be used for transformer station PT parallel devices in each bus, first
The voltage transformer of the bus is detected every cutter position, if voltage transformer is set to conjunction position every cutter spacing, execution step 3 is redirected）；
Else if voltage transformer is set to a point position every cutter spacing, then execution step 2 is redirected）；
2）Judge the position of the outdoor bus section breaker and both sides disconnecting link auxiliary contact of transformer station, if outdoor bus section
The position of chopper and both sides disconnecting link auxiliary contact is a point position, then redirect again execution step 1）；If outdoor bus section breaks
The position of road device and both sides disconnecting link auxiliary contact then redirects execution step 3 to close position）；
3）Obtaining the bus carries out the phase voltage amplitude of any one phase in front A, B, C three-phase of PT switchingsU X1And remaining biphase phase
Voltage magnitudeU X2WithU X3, obtain the residual voltage after the bus carries out PT switchingsU L1 ；
4）For the phase voltage amplitude of any one phaseU X1：Judge phase voltage amplitudeU X1In default first voltage threshold interval it is
No establishment, judges phase voltage amplitude if setting upU X1Normally, otherwise judge phase voltage amplitudeU X1It is abnormal；Judge phase voltage width
ValueU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 Less than default second voltage threshold value two
Whether condition is set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The air switch tripping operation of correspondence phase secondary voltage；Judge phase
Voltage magnitudeU X1Lower boundary, residual voltage less than default first voltage threshold intervalU L1 More than default tertiary voltage threshold
Value, voltage magnitudeU X2More than default tertiary voltage threshold value, voltage magnitudeU X3More than four conditions of default tertiary voltage threshold value
Whether set up simultaneously, if while phase voltage amplitude is judged if setting upU X1Correspondence phase busbar grounding；Judge phase voltage amplitudeU X1It is little
Lower boundary, residual voltage in default first voltage threshold intervalU L1 It is interval interior two articles positioned at default 4th voltage threshold
Whether part is set up simultaneously, if while phase voltage amplitude is judged if setting upU X1The high-voltage insurance fusing of correspondence phase.
5. the voltage failure automatic distinguishing method of the PT parallel devices for transformer station according to claim 4, its feature
It is, the step 2）It is middle judge outdoor bus section breaker and both sides disconnecting link auxiliary contact position when, specifically refer to by
Outdoor bus section breaker DL, the auxiliary contact every knife 1G of section switch DL sides, section switch DL opposite sides
Be connected in series every the auxiliary contact of knife 2G, if outdoor bus section breaker DL, section switch DL sides every knife 1G's
Auxiliary contact, the auxiliary contact every knife 2G of section switch DL opposite sides judge outdoor bus section simultaneously in position is closed, then
The position of chopper and both sides disconnecting link auxiliary contact judges outdoor bus section breaker and both sides disconnecting link auxiliary to close position, otherwise
The position of contact is a point position.
6. the voltage failure automatic distinguishing method of the PT parallel devices for transformer station according to claim 5, its feature
It is, the step 4）In default first voltage threshold interval be that second voltage threshold value is 20V between 50V to 65V, the
Three voltage thresholds are 80V, and it is between 25V to 40V that the 4th voltage threshold is interval.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510371122.6A CN104993388B (en) | 2015-06-30 | 2015-06-30 | PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510371122.6A CN104993388B (en) | 2015-06-30 | 2015-06-30 | PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device |
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| CN104993388A CN104993388A (en) | 2015-10-21 |
| CN104993388B true CN104993388B (en) | 2017-04-12 |
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| CN201510371122.6A Active CN104993388B (en) | 2015-06-30 | 2015-06-30 | PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device |
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| CN106602522A (en) * | 2017-02-13 | 2017-04-26 | 安阳工学院 | Voltage transformer parallel apparatus and automatic parallel control logic thereof |
| CN109921380B (en) * | 2019-02-02 | 2021-05-07 | 国网浙江省电力有限公司丽水供电公司 | Protection device for preventing re-moving parallel device from reverse charging |
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| CN101800442A (en) * | 2010-03-29 | 2010-08-11 | 许继集团有限公司 | Intelligent transformer substation voltage switching and paralleling method and device |
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