CN104993388A - 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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- CN104993388A CN104993388A CN201510371122.6A CN201510371122A CN104993388A CN 104993388 A CN104993388 A CN 104993388A CN 201510371122 A CN201510371122 A CN 201510371122A CN 104993388 A CN104993388 A CN 104993388A
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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, be specifically related to a kind of PT parallel device for transformer station and voltage failure automatic distinguishing method thereof.
Background technology
Tradition substation PT parallel device (voltage-operated device) is made up of in conjunction with external circuit relay element, realizes the switching of control to transformer substation voltage instrument transformer secondary (secondary) output voltage and two sections of bus (bus I and bus II) voltages.Bus I and the bus II of tradition substation PT parallel device respectively carry independently voltage transformer, the outdoor bus section breaker DL of transformer station and both sides disconnecting link auxiliary contact 1G, 2G, and are provided with relay BLJ5 arranged side by side between bus between bus I and bus II.But traditional substation PT parallel device does not have function displaying voltage, secondary voltage reverse charge when PT can not be prevented arranged side by side, can not real time monitoring transformer substation voltage loop running status, when electric voltage exception, need by manual measurement and analysis, to determine failure cause, affect troubleshooting efficiency; And this kind of device does not have fault automatic discrimination function, carry out fault distinguishing dependence artificial experience and judge, judge that accuracy is not high, and inefficiency.
Summary of the invention
The technical problem to be solved in the present invention: for the above-mentioned defect of prior art, one is provided to possess voltage sample and Presentation Function, facilitate real time monitoring transformer substation voltage loop running status, the PT parallel device for transformer station of troubleshooting efficiency can be improved, and on this basis for the PT parallel device of transformer station, provide and a kind ofly can realize fault automatic discrimination, failure diagnosis accurately reliable, the voltage failure automatic distinguishing method of diagnosing the fireballing PT parallel device for transformer station.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of PT parallel device for transformer station, it is characterized in that: comprise CPU and input and output unit, voltage acquisition unit, relay unit and man-machine interaction unit, described CPU and input and output unit comprise to be opened into module, output module and CPU module, described opening comprises into module the multichannel intake splicing ear opened with CPU module respectively and be connected into end, described multichannel intake splicing ear is all connected with man-machine interaction unit, described multichannel intake splicing ear comprises intake splicing ear 1PTG, intake splicing ear 2PTG and intake splicing ear FD, described intake splicing ear 1PTG is connected every cutter auxiliary contact with the voltage transformer of bus I, described intake splicing ear 2PTG is connected every cutter auxiliary contact with the voltage transformer of bus II, outdoor bus section breaker and the both sides disconnecting link auxiliary contact of described intake splicing ear FD and transformer station are connected, the end of outputing of described CPU module is connected with relay unit by outputing module, described man-machine interaction unit is connected with CPU module, the input of described voltage acquisition unit is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, and the output of described voltage acquisition unit is connected with the input of CPU module.
Preferably, described voltage acquisition unit comprises 7 relays arranged side by side and 14 voltage collection circuits, described 14 voltage collection circuits comprise I female A phase voltage Acquisition Circuit A602, I female B phase voltage Acquisition Circuit B602, I female C phase voltage Acquisition Circuit C602, I female residual voltage link L602, I female A phase metered voltage Acquisition Circuit A602J, I female B phase metered voltage Acquisition Circuit B602J, I female C phase metered voltage Acquisition Circuit C602J, II female A phase voltage Acquisition Circuit A604, II female B phase voltage Acquisition Circuit B604, II female C phase voltage Acquisition Circuit C604, II female residual voltage link L604, II female A phase metered voltage Acquisition Circuit A604J, II female B phase metered voltage Acquisition Circuit B604J, II female C phase metered voltage Acquisition Circuit C604J, export after the female A phase voltage Acquisition Circuit A602 and II of described I female A phase voltage Acquisition Circuit A604 is connected to a relay arranged side by side jointly, export after the female B phase voltage Acquisition Circuit B602 and II of described I female B phase voltage Acquisition Circuit B604 is connected to a relay arranged side by side jointly, export after the female C phase voltage Acquisition Circuit C602 and II of described I female C phase voltage Acquisition Circuit C604 is connected to a relay arranged side by side jointly, export after the female residual voltage link of described I L602 and II female residual voltage link L604 is connected to a relay arranged side by side jointly, export after the female A phase metered voltage Acquisition Circuit A602J and II of described I female A phase metered voltage Acquisition Circuit A604J is connected to a relay arranged side by side jointly, export after the female B phase metered voltage Acquisition Circuit B602J and II of described I female B phase metered voltage Acquisition Circuit B604J is connected to a relay arranged side by side jointly, export after the female C phase metered voltage Acquisition Circuit C602J and II of described I female C phase metered voltage Acquisition Circuit C604J is connected to a relay arranged side by side jointly.
Preferably, described voltage acquisition unit also comprise 14 heavy motor type relaies and 21 recover thermistor soon, respectively be connected in series with a heavy motor type relay between described 14 voltage collection circuits and relay arranged side by side, 14 heavy motor type relaies in described voltage acquisition unit and 7 relays arranged side by side are all in series with one and recover thermistor soon.
Preferably, described multichannel intake splicing ear also comprises relay splicing ear BL5 arranged side by side between outside involution splicing ear FGK and bus, and between the bus between described bus between the bus I of relay splicing ear BL5 arranged side by side and transformer station and bus II, the auxiliary contact of relay BLJ5 are connected side by side, described relay unit comprises the relay 1PT dropped into for control bus I, for the relay 2PT that control bus II drops into, for exporting the relay 1VFJ of bus I fault-signal, for exporting the relay 2VFJ of bus II fault-signal, for the relay GJ of output device alarm signal, for the relay BSJ of output device block signal, for exporting the relay BL of output signal side by side, described relay 1PT, relay 2PT, relay 1VFJ, relay 2VFJ, relay GJ, relay BSJ, relay BL respectively with the outputing to hold and be connected of CPU module, described relay BL is parallel with LED 1, described relay GJ is parallel with LED 2.
Based on the technical scheme of the PT parallel device for transformer station provided by the invention, the present invention also provides a kind of voltage failure automatic distinguishing method of the PT parallel device for transformer station further, and step comprises:
1) for aforementioned for each bus in the PT parallel device of transformer station, first detect the voltage transformer of this bus every cutter position, if voltage transformer is set to co-bit every cutter spacing, then redirect perform step 3); Voltage transformer is set to a point position every cutter spacing else if, then redirect performs step 2);
2) judge the outdoor bus section breaker of transformer station and the position of both sides disconnecting link auxiliary contact, if the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is a point position, then redirect performs step 1) again; If the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is co-bit, then redirect performs step 3);
3) obtain this bus and carry out the phase voltage amplitude that PT switches any phase in front A, B, C three-phase
u x1
and the phase voltage amplitude of all the other two-phases
u x2
with
u x3
, obtain this bus carry out PT switching after residual voltage
u l1 ;
4) for the phase voltage amplitude of any phase
u x1
: judge phase voltage amplitude
u x1
whether set up in the first voltage threshold interval of presetting, if set up, judge phase voltage amplitude
u x1
normally, otherwise judge phase voltage amplitude
u x1
abnormal; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be less than default the second voltage threshold two conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase secondary voltage sky opens tripping operation; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be greater than default tertiary voltage threshold value, voltage magnitude
u x2
be greater than default tertiary voltage threshold value, voltage magnitude
u x3
be greater than default tertiary voltage threshold value four conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase busbar grounding; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be positioned at default two, the 4th voltage threshold interval condition whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase high-voltage insurance fusing.
Preferably, described step 2) in when judging the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact, specifically refer to outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are connected in series, if outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are in co-bit simultaneously, then judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as co-bit, otherwise judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as a point position.
Preferably, the first voltage threshold interval of presetting in described step 4) is between 50V to 65V, and the second voltage threshold is 20V, and tertiary voltage threshold value is 80V, and the 4th voltage threshold interval is between 25V to 40V.
The PT parallel device that the present invention is used for transformer station has following advantage: the PT parallel device that the present invention is used for transformer station comprises CPU and input and output unit, voltage acquisition unit, relay unit and man-machine interaction unit, CPU and input and output unit comprise to be opened into module, output module and CPU module, open and comprise into module the multichannel intake splicing ear opened with CPU module respectively and be connected into end, multichannel intake splicing ear is all connected with man-machine interaction unit, multichannel intake splicing ear comprises intake splicing ear 1PTG, intake splicing ear 2PTG and intake splicing ear FD, the voltage transformer that can gather bus I and bus II is respectively every the outdoor bus section breaker of cutter auxiliary contact and transformer station and both sides disconnecting link auxiliary contact, simultaneously the input of voltage acquisition unit respectively with the A of bus I and bus II, B, C is mutually each and open-triangular winding is connected, possess voltage sample and Presentation Function, facilitate real time monitoring transformer substation voltage loop running status, troubleshooting efficiency can be improved, and when gathered electric voltage exception, controlledly can send corresponding warning information, prompting O&M maintainer process, thus shorten searching and the processing time fault.
The voltage failure automatic distinguishing method of PT parallel device that the present invention is used for transformer station has following advantage: the voltage failure automatic distinguishing method that the present invention is used for the PT parallel device of transformer station for aforementioned for each bus in the PT parallel device of transformer station, detect the voltage transformer of this bus every cutter position, if voltage transformer is set to co-bit every cutter spacing, if or voltage transformer is when cutter spacing is set to point position and the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is co-bit, obtain bus and carry out the front A of PT switching, B, the phase voltage amplitude of any phase in C three-phase
u x1
and the phase voltage amplitude of all the other two-phases
u x2
with
u x3
, obtain this bus carry out PT switching after residual voltage
u l1 , according to the above-mentioned voltage gathered, the phase voltage amplitude of any phase of A, B, C in the PT parallel device median generatrix I of transformer station and bus II can be differentiated respectively
u x1
abnormal conditions, phase voltage amplitude
u x1
corresponding phase secondary voltage sky opens trip condition, phase voltage amplitude
u x1
corresponding phase busbar grounding situation, phase voltage amplitude
u x1
corresponding phase high-voltage insurance fusing situation, have failure diagnosis accurately reliable, diagnose fireballing advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of 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.
Fig. 5 is the job step schematic flow sheet of embodiment of the present invention PT parallel device.
Fig. 6 is the steps flow chart schematic diagram of embodiment of the present invention voltage failure automatic distinguishing method.
Embodiment
As Fig. 1, shown in Fig. 2 and Fig. 3, the PT parallel device that the present embodiment is used for transformer station comprises CPU and input and output unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4, CPU and input and output unit 1 comprise to be opened into module 11, output module 12 and CPU module 13, open and comprise into module 11 the multichannel intake splicing ear opened with CPU module 13 respectively and be connected into end, multichannel intake splicing ear is all connected with man-machine interaction unit 4, multichannel intake splicing ear comprises intake splicing ear 1PTG, intake splicing ear 2PTG and intake splicing ear FD, intake splicing ear 1PTG is connected every cutter auxiliary contact with the voltage transformer of bus I, intake splicing ear 2PTG is connected every cutter auxiliary contact with the voltage transformer of bus II, outdoor bus section breaker and the both sides disconnecting link auxiliary contact of intake splicing ear FD and transformer station are connected, the end of outputing of CPU module 13 is connected with relay unit 3 by outputing module 12, man-machine interaction unit 4 is connected with CPU module 13, the input of voltage acquisition unit 2 is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, and the output of voltage acquisition unit 2 is connected with the input of CPU module 13.
See Fig. 1, the PT parallel device that the present embodiment is used for transformer station also comprises bus board and power supply, power supply, CPU and input and output unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4 realize interconnecting of signal and power supply respectively by bus board, CPU and input and output unit 1, voltage acquisition unit 2, relay unit 3 and man-machine interaction unit 4 are equipped with and patch connector.There is no doubt that, bus board is not the required parts implementing technical solution of the present invention, in addition also above-mentioned parts directly can be connected by cable, and power supply also can adopt independent external form or and other equipment common sources of transformer station, therefore no longer bus board and power supply are further detailed or are described in the present embodiment.
In the present embodiment, CPU module 13 adopts selects STM32f103vft6 to be core controller, this controller is ARM32 bit CPU, its maximum operation frequency is 72MHz, 1.25DMips/MHZ, has 768K ~ 1M flash memory space, there is 96KSRAM, its sampling channel number reaches 16, and sampling precision is 12, can fully meet device performance requirement.
As shown in Figure 2, be provided with altogether 9 tunnel intake splicing ears in the present embodiment, wherein 5 tunnel intake splicing ears use, and 4 tunnel intake splicing ears do not use.In the 5 tunnel intake splicing ears used, except aforesaid 3 tunnel intake splicing ears, also comprise relay splicing ear BL5 arranged side by side between outside involution splicing ear FGK and bus, between the bus between bus between the bus I of relay splicing ear BL5 arranged side by side and transformer station and bus II, the auxiliary contact of relay BLJ5 are connected side by side.In the present embodiment, multichannel intake splicing ear and CPU module 13 are opened between end and are provided with optical coupling module, and to guarantee the strong and weak electric signal isolation of multichannel intake, the separation of AC and DC signal, interference free performance is better.The conventional P T parallel device (voltage-operated device) of transformer station is simple relay control device, without CPU intake measuring ability, and secondary voltage reverse charge when PT can not be prevented arranged side by side.The PT parallel device of the present embodiment is for improving anti-reverse charging Electricity Functional, add relay splicing ear BL5 arranged side by side between bus, between the bus between bus between the bus I of relay splicing ear BL5 arranged side by side and transformer station and bus II, the auxiliary contact of relay BLJ5 are connected side by side, the control logic arranged side by side that can be for preventing secondary voltage reverse charge accident from occurring provides underlying hardware, when any one group of PT(voltage transformer of bus I and bus II) put into operation, and when between bus, relay BLJ5 arranged side by side closes, then the PT parallel device of the present embodiment does not need to sentence in-phase voltage difference, can be directly arranged side by side, when relay BLJ5 arranged side by side disconnects when between bus, detect in-phase voltage difference by CPU and whether exceed set point, judge whether to allow PT arranged side by side, thus prevent secondary voltage reverse charge accident from occurring.
As shown in Figure 2, relay unit 3 comprises the relay 1PT dropping into (being realized by the voltage transformer of drived control bus I) for control bus I, the relay 2PT of (being realized by the voltage transformer of drived control bus II) is dropped into for control bus II, for exporting the relay 1VFJ of bus I fault-signal, for exporting the relay 2VFJ of bus II fault-signal, for the relay GJ of output device alarm signal, for the relay BSJ of output device block signal, for exporting the relay BL of output signal side by side, relay 1PT, relay 2PT, relay 1VFJ, relay 2VFJ, relay GJ, relay BSJ, relay BL respectively with the outputing to hold and be connected of CPU module 13, relay BL is parallel with LED 1, relay GJ is parallel with LED 2.This portion of this device separate into, output displacement information and directly can show at man-machine interaction unit; relay unit 3 drives LED 1 and LED 2; real-time monitoring voltage input, juxtaposition, with or without paired running states such as abnormality alarmings; facilitate transformer station's operation maintenance personnel carry out voltage also, off-the-line grid switching operation time check that voltage once and secondary circuit running status, prevents because personnel's misoperation causes device damage, protective device malfunction event to occur.See Fig. 2, the present embodiment repeat circuit unit 3 also comprises a duplicate relay.In the present embodiment, relay unit 3 specifically same relay board realizes, and to facilitate the socket connection of realization and bus board, and each relay is connected by many 24V voltage relays, and contact capacity is not less than 5A.
As shown in Figure 3, voltage acquisition unit 2 comprises 7 relay (BLJ1#1 arranged side by side, BLJ1#2, BLJ2#1, BLJ2#2, BLJ3#1, BLJ3#2, BLJ4#1) and 14 voltage collection circuits, 14 voltage collection circuits comprise I female A phase voltage Acquisition Circuit A602, I female B phase voltage Acquisition Circuit B602, I female C phase voltage Acquisition Circuit C602, I female residual voltage link L602, I female A phase metered voltage Acquisition Circuit A602J, I female B phase metered voltage Acquisition Circuit B602J, I female C phase metered voltage Acquisition Circuit C602J, II female A phase voltage Acquisition Circuit A604, II female B phase voltage Acquisition Circuit B604, II female C phase voltage Acquisition Circuit C604, II female residual voltage link L604, II female A phase metered voltage Acquisition Circuit A604J, II female B phase metered voltage Acquisition Circuit B604J, II female C phase metered voltage Acquisition Circuit C604J, export after the female A phase voltage Acquisition Circuit A602 and II of I female A phase voltage Acquisition Circuit A604 is connected to a relay arranged side by side jointly, export after the female B phase voltage Acquisition Circuit B602 and II of I female B phase voltage Acquisition Circuit B604 is connected to a relay arranged side by side jointly, export after the female C phase voltage Acquisition Circuit C602 and II of I female C phase voltage Acquisition Circuit C604 is connected to a relay arranged side by side jointly, export after the female residual voltage link of I L602 and II female residual voltage link L604 is connected to a relay arranged side by side jointly, export after the female A phase metered voltage Acquisition Circuit A602J and II of I female A phase metered voltage Acquisition Circuit A604J is connected to a relay arranged side by side jointly, export after the female B phase metered voltage Acquisition Circuit B602J and II of I female B phase metered voltage Acquisition Circuit B604J is connected to a relay arranged side by side jointly, export after the female C phase metered voltage Acquisition Circuit C602J and II of I female C phase metered voltage Acquisition Circuit C604J is connected to a relay arranged side by side jointly.
As shown in Figure 3, voltage acquisition unit 2 also comprises 14 heavy motor type relay (1PTJ1#1 ~ 1PTJ4#1,2PTJ1#1 ~ 2PTJ4#1) and 21 fast recovery thermistor PPTC, respectively be connected in series with a heavy motor type relay between 14 voltage collection circuits and relay arranged side by side, 14 heavy motor type relaies in voltage acquisition unit 2 and 7 relays arranged side by side are all in series with one and recover thermistor soon.Such as I female A phase voltage Acquisition Circuit A602 connect successively heavy motor type relay 1PTJ1#1, one recover thermistor PPTC soon after be connected to one end of relay BLJ1#1 arranged side by side; II female A phase voltage Acquisition Circuit A604 connect successively heavy motor type relay 2PTJ1#1, one recover soon thermistor PPTC and another recover thermistor PPTC soon after be connected to the other end of relay BLJ1#1 arranged side by side.
As shown in Figure 4, voltage collection circuit in the present embodiment is direct resistance voltage sample circuit, mainly comprise adjustment current-limiting resistance R22, voltage transformer T9 and sampling resistor 25, wherein voltage transformer T9 selects micro electric flow pattern voltage transformer T9, the external voltage acquisition range of PT parallel device design is 0 ~ 120VAC, for ease of the sampling of CPU module 13, voltage collection circuit need utilize voltage transformer T9 that input voltage is down to CPU module 13 can the scope of Direct Sampling.The model of voltage transformer T9 is DL-PT202H1, its specified input current is 2mA, output-current rating is 2mA, maximum input 10mA, phase difference is <=15 ', unloaded linearity <=0.1%, and working temperature is-35 DEG C ~+70 DEG C, the size of current-limiting resistance R22 can be adjusted, to meet sampling precision requirement according to detection voltage range.It should be noted that, Fig. 4 is only an example of voltage collection circuit, and certainly, those skilled in the art also can adopt the voltage collection circuit of other types as required.
As shown in Figure 5, the job step of the PT parallel device of the present embodiment is as follows:
S1) system electrification, CPU module 13 self-inspection, if normally, then the running indicator controlled on man-machine interaction unit 4 is bright, otherwise the stand by lamp controlled on man-machine interaction unit 4 is bright;
S2) under operation, CPU module 13 regularly detects the intake signal opened into module 11; If the voltage transformer that the value of intake splicing ear 1PTG is 1(bus I closes), then transfer bus I voltage exports; If the voltage transformer that the value of intake splicing ear 2PTG is 1(bus II closes), then transfer bus II voltage exports; If the value of intake splicing ear FD is that the outdoor bus section breaker DL of 1(transformer station and both sides disconnecting link 1G, 2G are closed), and redirect performs next step;
S3) judge that the value of intake splicing ear 1PTG is 1 and the value of intake splicing ear 2PTG is 1(1PTG=1 & 2PTG=1) whether set up simultaneously, if set up, the in-phase voltage calculating bus I and bus II is poor, when in-phase voltage difference is less than 15V, arranging the amount of outputing allows the value of BL to be that 0(relay BL disconnects, LED 1 extinguishes side by side), otherwise when in-phase voltage difference is more than or equal to 15V, redirect performs step S6); If be false, then redirect performs next step;
S4) judge the value of intake splicing ear 1PTG be 1 or the value of intake splicing ear 2PTG be 1(1PTG=1 or 2PTG=1) whether set up, if set up, then redirect performs step S6); Otherwise redirect performs step S5);
Whether the intake S5) judging relay splicing ear BL5 arranged side by side between bus is relay BLJ5 co-bit arranged side by side between 1(bus), if the intake of relay splicing ear BL5 arranged side by side is 1 between bus, then redirect performs step S6); Otherwise redirect performs step S3);
S6) arranging the amount of outputing allows the value of BL to be that 1(relay B is closed, LED 1 is bright side by side), now can export side by side by the bus I of control PT parallel device and bus II.
It should be noted that, also output relay BLK arranged side by side is provided with in PT parallel device in the present embodiment, before the bus I of control PT parallel device and bus II exports side by side, also need that output relay BLK's arranged side by side in cycle detection PT parallel device open into state, when output relay BLK arranged side by side to open into state be 1 time, then the bus I of PT parallel device and bus II exports side by side, otherwise to continue to detect in PT parallel device the opening into state of output relay BLK side by side.In addition, output relay BLK arranged side by side is not the essential element of the PT parallel device of transformer station, and above-mentioned flow process is only a kind of method of work example of the PT parallel device of the present embodiment, in actual application, the operation control logic that may increase more relay as required or select other different.
As shown in Figure 6, the present embodiment comprises for the step of the voltage failure automatic distinguishing method of the PT parallel device of transformer station:
1) for for each bus in the PT parallel device of transformer station, the voltage transformer first detecting this bus (bus I or bus II) is every cutter position, if voltage transformer is set to co-bit every cutter spacing, then redirect performs step 3); Voltage transformer is set to a point position every cutter spacing else if, then redirect performs step 2);
2) judge the outdoor bus section breaker of transformer station and the position of both sides disconnecting link auxiliary contact, if the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is a point position, then redirect performs step 1) again; If the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is co-bit, then redirect performs step 3);
3) obtain this bus and carry out the phase voltage amplitude that PT switches any phase in front A, B, C three-phase
u x1
and the phase voltage amplitude of all the other two-phases
u x2
with
u x3
, obtain this bus carry out PT switching after residual voltage
u l1 ;
4) for the phase voltage amplitude of any phase
u x1
: judge phase voltage amplitude
u x1
whether set up in the first voltage threshold interval of presetting, if set up, judge phase voltage amplitude
u x1
normally, otherwise judge phase voltage amplitude
u x1
abnormal; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be less than default the second voltage threshold two conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase secondary voltage sky opens tripping operation; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be greater than default tertiary voltage threshold value, voltage magnitude
u x2
be greater than default tertiary voltage threshold value, voltage magnitude
u x3
be greater than default tertiary voltage threshold value four conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase busbar grounding; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be positioned at default two, the 4th voltage threshold interval condition whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase high-voltage insurance fusing.
The present embodiment above-mentioned steps can determine the fault of bus I and bus II respectively: for bus I, and what step 3) obtained is the phase voltage amplitude that bus I carries out that PT switches any phase in front A, B, C three-phase
u x1(1)
and the phase voltage amplitude of all the other two-phases
u x2(1)
with
u x3(1)
, acquisition bus I carries out the residual voltage after PT switching
u l1(1)
; For bus II, what step 3) obtained is the phase voltage amplitude that bus I carries out that PT switches any phase in front A, B, C three-phase
u x1(2)
and the phase voltage amplitude of all the other two-phases
u x2(2)
with
u x3(2)
, acquisition bus I carries out the residual voltage after PT switching
u l1(2)
; Do not repeat them here.The present embodiment by above-mentioned steps, can differentiate the phase voltage amplitude of any phase of A, B, C in the PT parallel device median generatrix I of transformer station and bus II respectively
u x1
abnormal conditions, phase voltage amplitude
u x1
corresponding phase secondary voltage sky opens trip condition, phase voltage amplitude
u x1
corresponding phase busbar grounding situation, phase voltage amplitude
u x1
corresponding phase high-voltage insurance fusing situation, and can be shown by man-machine interaction unit 4 for different failure conditions, when bus I is judged as any one fault type in Fig. 6, all drive I female voltage failure relay 1VFJ, when bus II is judged as any one fault type in Fig. 6, all drive II female voltage failure relay 2VFJ, thus facilitate monitor staff to understand malfunction.
In the present embodiment, step 2) in when judging the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact, specifically refer to outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are connected in series, if outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are in co-bit simultaneously, then judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as co-bit, otherwise judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as a point position.Which realizes judging that the circuit structure needed for position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is the simplest, also can arrange logical AND module as required to realize in addition by detecting the position judging outdoor bus section breaker and both sides disconnecting link auxiliary contact.
As shown in Figure 6, the first voltage threshold interval of presetting in the present embodiment in step 4) is between 50V to 65V, and the second voltage threshold is 20V, and tertiary voltage threshold value is 80V, and the 4th voltage threshold interval is between 25V to 40V.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the PT parallel device for transformer station, it is characterized in that: comprise CPU and input and output unit (1), voltage acquisition unit (2), relay unit (3) and man-machine interaction unit (4), described CPU and input and output unit (1) comprise to be opened into module (11), output module (12) and CPU module (13), described opening comprises into module (11) the multichannel intake splicing ear opened with CPU module (13) respectively and be connected into end, described multichannel intake splicing ear is all connected with man-machine interaction unit (4), described multichannel intake splicing ear comprises intake splicing ear 1PTG, intake splicing ear 2PTG and intake splicing ear FD, described intake splicing ear 1PTG is connected every cutter auxiliary contact with the voltage transformer of bus I, described intake splicing ear 2PTG is connected every cutter auxiliary contact with the voltage transformer of bus II, outdoor bus section breaker and the both sides disconnecting link auxiliary contact of described intake splicing ear FD and transformer station are connected, the end of outputing of described CPU module (13) is connected with relay unit (3) by outputing module (12), described man-machine interaction unit (4) is connected with CPU module (13), the input of described voltage acquisition unit (2) is connected with each phase of A, B, C of bus I and bus II and open-triangular winding respectively, and the output of described voltage acquisition unit (2) is connected with the input of CPU module (13).
2. the PT parallel device for transformer station according to claim 1, it is characterized in that: described voltage acquisition unit (2) comprises 7 relays arranged side by side and 14 voltage collection circuits, described 14 voltage collection circuits comprise I female A phase voltage Acquisition Circuit A602, I female B phase voltage Acquisition Circuit B602, I female C phase voltage Acquisition Circuit C602, I female residual voltage link L602, I female A phase metered voltage Acquisition Circuit A602J, I female B phase metered voltage Acquisition Circuit B602J, I female C phase metered voltage Acquisition Circuit C602J, II female A phase voltage Acquisition Circuit A604, II female B phase voltage Acquisition Circuit B604, II female C phase voltage Acquisition Circuit C604, II female residual voltage link L604, II female A phase metered voltage Acquisition Circuit A604J, II female B phase metered voltage Acquisition Circuit B604J, II female C phase metered voltage Acquisition Circuit C604J, export after the female A phase voltage Acquisition Circuit A602 and II of described I female A phase voltage Acquisition Circuit A604 is connected to a relay arranged side by side jointly, export after the female B phase voltage Acquisition Circuit B602 and II of described I female B phase voltage Acquisition Circuit B604 is connected to a relay arranged side by side jointly, export after the female C phase voltage Acquisition Circuit C602 and II of described I female C phase voltage Acquisition Circuit C604 is connected to a relay arranged side by side jointly, export after the female residual voltage link of described I L602 and II female residual voltage link L604 is connected to a relay arranged side by side jointly, export after the female A phase metered voltage Acquisition Circuit A602J and II of described I female A phase metered voltage Acquisition Circuit A604J is connected to a relay arranged side by side jointly, export after the female B phase metered voltage Acquisition Circuit B602J and II of described I female B phase metered voltage Acquisition Circuit B604J is connected to a relay arranged side by side jointly, export after the female C phase metered voltage Acquisition Circuit C602J and II of described I female C phase metered voltage Acquisition Circuit C604J is connected to a relay arranged side by side jointly.
3. the PT parallel device for transformer station according to claim 2, it is characterized in that: described voltage acquisition unit (2) also comprise 14 heavy motor type relaies and 21 recover thermistor soon, respectively be connected in series with a heavy motor type relay between described 14 voltage collection circuits and relay arranged side by side, 14 heavy motor type relaies in described voltage acquisition unit (2) and 7 relays arranged side by side are all in series with one and recover thermistor soon.
4. the PT parallel device for transformer station according to claim 1 or 2 or 3, it is characterized in that: described multichannel intake splicing ear also comprises relay splicing ear BL5 arranged side by side between outside involution splicing ear FGK and bus, between the bus between described bus between the bus I of relay splicing ear BL5 arranged side by side and transformer station and bus II, the auxiliary contact of relay BLJ5 are connected side by side, described relay unit (3) comprises the relay 1PT dropped into for control bus I, for the relay 2PT that control bus II drops into, for exporting the relay 1VFJ of bus I fault-signal, for exporting the relay 2VFJ of bus II fault-signal, for the relay GJ of output device alarm signal, for the relay BSJ of output device block signal, for exporting the relay BL of output signal side by side, described relay 1PT, relay 2PT, relay 1VFJ, relay 2VFJ, relay GJ, relay BSJ, relay BL respectively with the outputing to hold and be connected of CPU module (13), described relay BL is parallel with LED 1, described relay GJ is parallel with LED 2.
5., for a voltage failure automatic distinguishing method for the PT parallel device of transformer station, it is characterized in that step comprises:
1) in Claims 1 to 4 described in any one for each bus in the PT parallel device of transformer station, first detect the voltage transformer of this bus every cutter position, if voltage transformer is set to co-bit every cutter spacing, then redirect perform step 3); Voltage transformer is set to a point position every cutter spacing else if, then redirect performs step 2);
2) judge the outdoor bus section breaker of transformer station and the position of both sides disconnecting link auxiliary contact, if the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is a point position, then redirect performs step 1) again; If the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is co-bit, then redirect performs step 3);
3) obtain this bus and carry out the phase voltage amplitude that PT switches any phase in front A, B, C three-phase
u x1
and the phase voltage amplitude of all the other two-phases
u x2
with
u x3
, obtain this bus carry out PT switching after residual voltage
u l1 ;
4) for the phase voltage amplitude of any phase
u x1
: judge phase voltage amplitude
u x1
whether set up in the first voltage threshold interval of presetting, if set up, judge phase voltage amplitude
u x1
normally, otherwise judge phase voltage amplitude
u x1
abnormal; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be less than default the second voltage threshold two conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase secondary voltage sky opens tripping operation; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be greater than default tertiary voltage threshold value, voltage magnitude
u x2
be greater than default tertiary voltage threshold value, voltage magnitude
u x3
be greater than default tertiary voltage threshold value four conditions whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase busbar grounding; Judge phase voltage amplitude
u x1
be less than lower boundary, the residual voltage in the first default voltage threshold interval
u l1 be positioned at default two, the 4th voltage threshold interval condition whether to set up simultaneously, if set up simultaneously, judge phase voltage amplitude
u x1
corresponding phase high-voltage insurance fusing.
6. the voltage failure automatic distinguishing method of the PT parallel device for transformer station according to claim 5, it is characterized in that, described step 2) in when judging the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact, specifically refer to outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are connected in series, if outdoor bus section breaker DL, the auxiliary contact every cutter 1G of section breaker DL side, the auxiliary contact every cutter 2G of section breaker DL opposite side are in co-bit simultaneously, then judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as co-bit, otherwise judge that the position of outdoor bus section breaker and both sides disconnecting link auxiliary contact is as a point position.
7. the voltage failure automatic distinguishing method of the PT parallel device for transformer station according to claim 6, it is characterized in that, the first voltage threshold interval of presetting in described step 4) is between 50V to 65V, second voltage threshold is 20V, tertiary voltage threshold value is 80V, and the 4th voltage threshold interval is between 25V to 40V.
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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 |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
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| CN104993388A true CN104993388A (en) | 2015-10-21 |
| CN104993388B 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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| CN109921380A (en) * | 2019-02-02 | 2019-06-21 | 国网浙江省电力有限公司丽水供电公司 | A kind of protective device for preventing from moving parallel device reverse charge again |
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| Publication number | Publication date |
|---|---|
| CN104993388B (en) | 2017-04-12 |
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