CN108181528A - The high-tension cable differential protection check system of no load condition - Google Patents

The high-tension cable differential protection check system of no load condition Download PDF

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Publication number
CN108181528A
CN108181528A CN201711496801.1A CN201711496801A CN108181528A CN 108181528 A CN108181528 A CN 108181528A CN 201711496801 A CN201711496801 A CN 201711496801A CN 108181528 A CN108181528 A CN 108181528A
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China
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demagnetization
make control
main break
module
differential protection
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CN201711496801.1A
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Chinese (zh)
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CN108181528B (en
Inventor
傅晓峰
徐金兵
朱立军
王立大
钱天人
吴昊
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中国能源建设集团华东电力试验研究院有限公司
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

The invention discloses the high-tension cable differential protection check systems of no load condition.Belong to high-tension cable differential protection calibration technology field, which can carry out demagnetization operation to generator automatically when power failure occurs in voltage stabilizing washing pipe analysis system ontology.Controller, degaussing switch device, high-tension cable differential protection check system ontology and the generator that mains power is provided for high-tension cable differential protection check system ontology;Degaussing switch device includes the main break-make control module of No.1 and demagnetization module;The input terminal of the main break-make control module of No.1 and the input terminal of demagnetization module are respectively coupled on the power output end of generator;The output terminal of the main break-make control module of No.1 is connected on 220KV busbares.

Description

The high-tension cable differential protection check system of no load condition
Technical field
The present invention relates to high-tension cable differential protection calibration technology fields, and in particular to the high-tension cable of no load condition is poor Dynamic protective calibration system.
Background technology
At present, the high-tension cable differential protection check system of no load condition is in zero load high-voltage electricity relatively difficult to achieve Cable differential protection verifies;And the electricity consumption of high-tension cable differential protection check system is larger, when high-tension cable differential protection school Check system break down power-off suddenly when, the electric energy that disconnects suddenly or to providing power supply for high-tension cable differential protection check system The generator of power generates huge impact, and generator is even burnt out when serious.Therefore one kind is designed in the case that zero load It can realize that high-tension cable differential protection verifies, and when power failure occurs in high-tension cable differential protection check system, is not easy to The system for burning out generator is very necessary.
Invention content
The present invention is the above problem in order to solve existing high-tension cable differential protection check system ontological existence, provides one The high-tension cable differential protection check system of kind no load condition, the system can also realize that high-tension cable is poor in the case that zero load Dynamic protective calibration, and when power failure occurs in high-tension cable differential protection check system ontology, generator can be carried out automatically Demagnetization operation, protection generator power failure will not occur because of high-tension cable differential protection check system ontology and cause to generate electricity The situation that machine is burned occurs, and extends the service life of generator.
More than technical problem is solved by following technical proposal:
The high-tension cable differential protection check system of no load condition, including controller, voice prompting device, communication module, demagnetization Switching device, high-tension cable differential protection check system ontology and provide power supply for high-tension cable differential protection check system ontology The generator of power;High-tension cable differential protection check system ontology, which includes opening, standby to be become circuit, opens and standby become circuit to include 220KV female Line, 220KV power cables differential protecting CT 1,220KV power cables, 220KV power cables differential protecting CT 2, A open standby change, 220KV power cables differential protecting CT 3 and B open standby change;One end of 220KV power cables differential protecting CT 1 is connected to 220KV mothers On line, the other end of 220KV power cables differential protecting CT 1 is connected on one end of 220KV power cables, 220KV electric power electricity One end of cable differential protecting CT 2 and one end of 220KV power cables differential protecting CT 3 are all connected to the another of 220KV power cables On one end;The other end of 220KV power cables differential protecting CT 2 is connected to A and opens on standby become;220KV power cable differential protections The other end of CT3 is connected to B and opens on standby become;Degaussing switch device includes the main break-make control module of No.1, No. two main break-make controls Module and demagnetization module;The input terminal and demagnetization mould of the input terminal of the main break-make control module of No.1, No. two main break-make control modules The input terminal of block is respectively coupled on the power output end of generator;The output terminal of the main break-make control module of No.1 and No. two masters The output terminal of break-make control module is respectively coupled on 220KV busbares;The control of high-tension cable differential protection check system ontology End processed, the control terminal of the main break-make control module of No.1, the control terminal of the control terminal of No. two main break-make control modules and demagnetization module It is connect respectively with controller.
When power failure occurs in high-tension cable differential protection check system ontology, demagnetization module starts immediately to generator Demagnetization operation is carried out, so as to which generator be protected to be not easy to be burned.This programme can also realize that high-tension cable is poor in the case that zero load Dynamic protective calibration, and when power failure occurs in high-tension cable differential protection check system ontology, generator can be carried out automatically Demagnetization operation, protection generator power failure will not occur because of high-tension cable differential protection check system ontology and cause to generate electricity The situation that machine is burned occurs, and extends the service life of generator.Simple in structure, safety is good, and reliability is high.
Preferably, further including No.1 node and No. two nodes, the main break-make control module of No.1 includes No.1 left-handed opening, one Number relay and the right switch of No.1, No. two main break-make control modules include No. two left-handed openings, No. two relays and No. two right switches, Demagnetization module includes demagnetization left-handed opening, demagnetization relay, the right switch of demagnetization and de-excitation resistance;
The left end of the left end of No.1 left-handed opening, the left end of No. two left-handed openings and demagnetization left-handed opening is connected on No.1 node; The right end of No.1 left-handed opening is connected to the left end of No.1 relay, and the right end of No.1 relay is connected to a left side for the right switch of No.1 End, the right end of the right switch of No.1 are connected on No. two nodes;The right end of No. two left-handed openings is connected to the left end of No. two relays, and two The right end of number relay is connected to the left end of No. two right switches, and the right end of No. two right switches is connected on No. two nodes;Demagnetization is left Switch right end is connected to the left end of demagnetization relay, and the right end of demagnetization relay is connected to the left end of the right switch of demagnetization, and demagnetization is right The right end of switch is connected on de-excitation resistance;220KV busbares are connected on No. two nodes;The power output end of generator is connected to On No.1 node;
The control of the control terminal of the right switch of the control terminal of No.1 left-handed opening, the control terminal of No.1 relay, No.1, No. two left-handed openings End, the control of the control terminal of No. two relays, the control terminal, the control terminal, demagnetization relay of demagnetization left-handed opening of No. two right switches The control terminal of end and the right switch of demagnetization is connect respectively with controller.
This structure can be in No. two main break-make control module free time or when No.1 main break-make control module free time is right respectively It carries out switch opening/closing time detection, and reliability is high.
Preferably, the demagnetization control of degaussing switch device is as follows:If the main break-make control module of No.1 is sent out from controller No.1 open command starts to the main break-make control module of No.1 to complete a length of T1 during the disconnection reaction needed for disconnection action, if No. two Main break-make control module completes disconnection action institute since controller sends out No. two open commands to No. two main break-make control modules A length of T2 during the disconnection reaction needed, if demagnetization module is completed to be connected since controller sends out demagnetization turn-on command to demagnetization module A length of T3 when conducting needed for action is reacted;If the generator system corresponding to degaussing switch device demagnetization switching needed for when Between be H;When the main break-make control module conducting of No.1, No. two main break-make control modules are then off, and are being controlled at this time The value of the disconnection reaction duration T2 of No. two main break-make control modules and demagnetization module conducting reaction duration T3 are detected under the control of device Value;Calculate demagnetization module be conducting to No. two main break-make control modules disconnect between time difference H2, then H2=| T2-T3 |≤ H;When back to back next time when to carry out demagnetization operation in the case of No. two main break-make control modules conductings, if working as T2-T3 When >=0, then the H2 times internal controller after No. two open commands start is sent out to No. two main break-make control modules just in controller Demagnetization turn-on command is sent out to demagnetization module;If as T2-T3 < 0, sent out in controller to No. two main break-make control modules Demagnetization module will be sent out demagnetization turn-on command by going out the H2 times internal controller before No. two open commands start;When No. two masters are logical During disconnected control module conducting, the main break-make control module of No.1 is then off, and detects one under the control of the controller at this time The value of the disconnection reaction duration T1 of number main break-make control module and the value of demagnetization module conducting reaction duration T3;Calculate demagnetization mould Block be conducting to the main break-make control module of No.1 disconnect between time difference H1, then H1=| T1-T3 |≤H;When it is back to back next time When to carry out demagnetization operation in the case of the conducting of No.1 main break-make control module, if as T1-T3 >=0, controller to The main break-make control module of No.1, which sends out the H1 times internal controller after No.1 open command starts and demagnetization module will be sent out, goes out Magnetic turn-on command;If as T1-T3 < 0, No.1 open command is sent out to the main break-make control module of No.1 in controller and started Preceding H1 times internal controller will send out demagnetization module demagnetization turn-on command.
Preferably, when duration T1 is reacted in the disconnection for detecting the main break-make control module of No.1, under the control of the controller, No.1 left-handed opening and the right switch of No.1 is first allowed all to disconnect, then detects the disconnection reaction duration of No.1 relay, the No.1 relay The disconnection reaction duration of device is T1;It has detected after the disconnection reaction duration T1 of No.1 relay then by No.1 left-handed opening and one Number right switch is all closed, and No.1 relay is allowed to be off;In the disconnection reaction of No. two main break-make control modules of detection During duration T2, under the control of the controller, No. two left-handed openings and No. two right switches is first allowed all to disconnect, then detect No. two relays Disconnection reaction duration, No. two relays disconnection reaction duration be T2;When having detected the disconnection reaction of No. two relays Then the right switch of No. two left-handed openings and No. two is all closed, and No. two relays is allowed to be off after long T2;It goes out in detection During magnetic module conducting reaction duration T3, under the control of the controller, demagnetization left-handed opening and the right switch of demagnetization is first allowed all to disconnect, then The closed reaction duration of demagnetization relay is detected, the closed reaction duration of the demagnetization relay is T3;Demagnetization relay is detected Then the right switch of demagnetization left-handed opening and demagnetization is all closed after the closed reaction duration T3 of device, and demagnetization relay is allowed to be in and is disconnected State.
Preferably, in the case of if the main break-make control module of No.1 and No. two main break-make control modules are all in conducting state Demagnetization process be, when T1 < T2 if in demagnetization when, the main break-make control module of No.1 will break in No. two main break-make control modules It is first disconnected before opening;Conversely, if when T1 > T2 in demagnetization when, No. two main break-make control modules will be in the main break-make control mould of No.1 Block first disconnects before disconnecting.
Preferably, high-tension cable differential protection check system ontology differential protection verification the specific implementation process is as follows:
Start, a 6kV low-tension transformer is selected to carry out impact test, and enroll dash current;Then result of the test is analyzed, and is led to Other test methods are crossed to be verified;Then Switching impulse experiment is carried out under rated voltage to power cable;Then selection is surveyed Record point is at 220kV switchyard relay bungalow differential protection screens;Then standby become is opened B under rated voltage and carries out Switching impulse examination It tests, surveys record surge waveform;Last shock wave shape compares and analyzes, and terminates after obtaining final result of the test.
Preferably, high-tension cable differential protection verification resolution policy is in the case of zero load:
1) before differential protection input, load test rheology is needed to draw polarity;In the low-pressure side three-phase shortcircuit of transformer, from High-pressure side adds in the power supply of 400V, using the direct impedance of transformer, obtains the current phase of the differential CT of cable, verification CT poles Property;
2) a flow-through test is carried out to cable differential protection both sides CT, to verify cable differential protecting CT polarity;
3) record transformer shock excitation is surveyed to shove to verify cable differential protecting CT polarity;It will when operation is impacted playing standby become Both sides secondary current needed for cable differential protection, which is led to, a little to be surveyed record, compares.
The present invention can reach following effect:
When power failure occurs in high-tension cable differential protection check system ontology, demagnetization module starts immediately to power generation the present invention Machine carries out demagnetization operation, so as to which generator be protected to be not easy to be burned.This programme can also realize high-tension cable in the case that zero load Differential protection verifies, and when there is power failure in high-tension cable differential protection check system ontology, can automatically to generator into Row demagnetization operation, protection generator power failure will not occur because of high-tension cable differential protection check system ontology and cause to send out The situation that motor is burned occurs, and extends the service life of generator.Simple in structure, safety is good, and reliability is high.
Description of the drawings
Fig. 1 is a kind of schematic diagram of circuit principle connecting structure of the present invention.
Fig. 2 is a kind of circuit theory connection structure schematic block diagram of the present invention.
Fig. 3 is that the present invention opens a kind of standby schematic diagram of circuit principle connecting structure for becoming circuit.
Specific embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
Embodiment:The high-tension cable differential protection check system of no load condition, referring to shown in Fig. 1-Fig. 3.Including control Device w4, voice prompting device w20, communication module w21, degaussing switch device w19, high-tension cable differential protection check system ontology The w18 and generator w17 that mains power is provided for high-tension cable differential protection check system ontology;
High-tension cable differential protection check system ontology includes 220KV busbares, 220KV including opening standby change circuit, opening the standby circuit that becomes Power cable differential protecting CT 1,220KV power cables, 220KV power cables differential protecting CT 2, A open standby change, 220KV electric power Cable differential protecting CT 3 and B open standby change;One end of 220KV power cables differential protecting CT 1 is connected on 220KV busbares, The other end of 220KV power cables differential protecting CT 1 is connected on one end of 220KV power cables, and 220KV power cables are differential One end of CT2 and one end of 220KV power cables differential protecting CT 3 is protected all to be connected on the other end of 220KV power cables; The other end of 220KV power cables differential protecting CT 2 is connected to A and opens on standby become;220KV power cables differential protecting CT 3 it is another One end is connected to B and opens on standby become;
Degaussing switch device includes the main break-make control module w1 of No.1, No. two main break-make control module w2 and demagnetization module w3;One The input terminal of the input terminal of number main break-make control module, the input terminal of No. two main break-make control modules and demagnetization module all connects respectively It is connected on the power output end of generator;The output terminal of the main break-make control module of No.1 and the output of No. two main break-make control modules End is respectively coupled on 220KV busbares;Voice prompting device, communication module, high-tension cable differential protection check system ontology The control of the control terminal of the main break-make control module of control terminal, No.1, the control terminal and demagnetization module of No. two main break-make control modules End is connect respectively with controller.
No.1 node w5 and No. two node w6 are further included, the main break-make control module of No.1 includes No.1 left-handed opening w7, No.1 Relay w8 and the right switch w9 of No.1, No. two main break-make control modules include No. two left-handed opening w10, No. two relay w11 and two Number right switch w12, demagnetization module include the right switch w15 of demagnetization left-handed opening w13, demagnetization relay w14, demagnetization and de-excitation resistance w16;
The left end of the left end of No.1 left-handed opening, the left end of No. two left-handed openings and demagnetization left-handed opening is connected on No.1 node; The right end of No.1 left-handed opening is connected to the left end of No.1 relay, and the right end of No.1 relay is connected to a left side for the right switch of No.1 End, the right end of the right switch of No.1 are connected on No. two nodes;The right end of No. two left-handed openings is connected to the left end of No. two relays, and two The right end of number relay is connected to the left end of No. two right switches, and the right end of No. two right switches is connected on No. two nodes;Demagnetization is left Switch right end is connected to the left end of demagnetization relay, and the right end of demagnetization relay is connected to the left end of the right switch of demagnetization, and demagnetization is right The right end of switch is connected on de-excitation resistance;220KV busbares are connected on No. two nodes;The power output end of generator is connected to On No.1 node;
The control of the control terminal of the right switch of the control terminal of No.1 left-handed opening, the control terminal of No.1 relay, No.1, No. two left-handed openings End, the control of the control terminal of No. two relays, the control terminal, the control terminal, demagnetization relay of demagnetization left-handed opening of No. two right switches The control terminal of end and the right switch of demagnetization is connect respectively with controller.
The demagnetization control of the high-tension cable differential protection check system of no load condition is as follows:
If the main break-make control module of No.1 is completed since controller sends out No.1 open command to the main break-make control module of No.1 A length of T1 when disconnection needed for disconnection action is reacted,
If No. two main break-make control modules are completed since controller sends out No. two open commands to No. two main break-make control modules A length of T2 when disconnection needed for disconnection action is reacted,
If the conducting that demagnetization module is completed to demagnetization module needed for turn-on action since controller sends out demagnetization turn-on command is anti- Seasonable a length of T3;
If needed for the demagnetization switching of the generator system corresponding to the high-tension cable differential protection check system of no load condition Time is H;
When the main break-make control module conducting of No.1, No. two main break-make control modules are then off, at this time in controller Control under the value of disconnection reaction duration T2 of No. two main break-make control modules of detection and demagnetization module conducting reaction duration T3 Value;Calculate demagnetization module be conducting to No. two main break-make control modules disconnect between time difference H2, then have H2=| T2-T3 |≤ H;When back to back next time when to carry out demagnetization operation in the case of No. two main break-make control modules conductings, if working as T2-T3 When >=0, then the H2 times internal controller after No. two open commands start is sent out to No. two main break-make control modules just in controller Demagnetization turn-on command is sent out to demagnetization module;If it during T2-T3 < 0, is sent out in controller to No. two main break-make control modules H2 times internal controller before No. two open commands start will send out demagnetization module demagnetization turn-on command;
When No. two main break-make control module conductings, the main break-make control module of No.1 is then off, at this time in controller Control under the value of disconnection reaction duration T1 of the detection main break-make control module of No.1 and demagnetization module conducting reaction duration T3 Value;Calculate demagnetization module be conducting to the main break-make control module of No.1 disconnect between time difference H1, then have H1=| T1-T3 |≤ H;When back to back next time when to carry out demagnetization operation in the case of the conducting of No.1 main break-make control module, if working as T1-T3 When >=0, then the H1 times internal controller after No.1 open command starts is sent out to the main break-make control module of No.1 just in controller Demagnetization turn-on command is sent out to demagnetization module;If it during T1-T3 < 0, is sent out in controller to the main break-make control module of No.1 H1 times internal controller before No.1 open command starts will send out demagnetization module demagnetization turn-on command.
When duration T1 is reacted in the disconnection for detecting the main break-make control module of No.1, under the control of the controller, No.1 is first allowed Left-handed opening and the right switch of No.1 all disconnect, and then detect the disconnection reaction duration of No.1 relay, the disconnection of the No.1 relay It is T1 to react duration;It has detected after the disconnection reaction duration T1 of No.1 relay then by No.1 left-handed opening and the right switch of No.1 It is all closed, and No.1 relay is allowed to be off;
When duration T2 is reacted in the disconnection for detecting No. two main break-make control modules, under the control of the controller, No. two left sides is first allowed to be opened It closes and No. two right switches all disconnects, then detect the disconnection reaction duration of No. two relays, the disconnection reaction of No. two relays Duration is T2;Then the right switch of No. two left-handed openings and No. two is all closed after having detected the disconnection reaction duration T2 of No. two relays It closes, and No. two relays is allowed to be off;
When detecting demagnetization module conducting reaction duration T3, under the control of the controller, demagnetization left-handed opening and the demagnetization right side is first allowed to be opened Pass all disconnects, and then detects the closed reaction duration of demagnetization relay, the closed reaction duration of the demagnetization relay is T3;Inspection Surveyed after the closed reaction duration T3 of demagnetization relay and to be then all closed the right switch of demagnetization left-handed opening and demagnetization, and allow demagnetization after Electric appliance is off.
If the main break-make control module of No.1 and No. two main break-make control modules are all in the demagnetization mistake in the case of conducting state Cheng Shi, when T1 < T2 if in demagnetization when, the main break-make control module of No.1 will be before No. two main break-make control modules disconnect first It disconnects;Conversely, if when T1 > T2 in demagnetization when, No. two main break-make control modules will disconnect it in the main break-make control module of No.1 It is preceding first to disconnect.
High-tension cable differential protection verification resolution policy is in the case of zero load:
1) before differential protection input, load test rheology is needed to draw polarity;In the low-pressure side three-phase shortcircuit of transformer, from High-pressure side adds in the power supply of 400V, using the direct impedance of transformer, obtains the current phase of the differential CT of cable, verification CT poles Property;
2) a flow-through test is carried out to cable differential protection both sides CT, to verify cable differential protecting CT polarity;
3) record transformer shock excitation is surveyed to shove to verify cable differential protecting CT polarity;It will when operation is impacted playing standby become Both sides secondary current needed for cable differential protection, which is led to, a little to be surveyed record, compares.
The polarity of 220kV cable differential protection A phases, B phases and C phases is opposite all with the polarity of CT.CT includes CT1, CT2 And CT3.
High-tension cable differential protection check system ontology differential protection verification the specific implementation process is as follows:
Start, a 6kV low-tension transformer is selected to carry out impact test, and enroll dash current;Then result of the test is analyzed, and is led to Other test methods are crossed to be verified;Then Switching impulse experiment is carried out under rated voltage to power cable;Then selection is surveyed Record point is at 220kV switchyard relay bungalow differential protection screens;Then standby become is opened B under rated voltage and carries out Switching impulse examination It tests, surveys record surge waveform;Last shock wave shape compares and analyzes, and terminates after obtaining final result of the test.
The present embodiment can be in No. two main break-make control module free time or when No.1 main break-make control module free time is right respectively It carries out switch opening/closing time detection, and reliability is high.When there is power failure in high-tension cable differential protection check system ontology, Demagnetization module starts immediately carries out demagnetization operation to generator, so as to which generator be protected to be not easy to be burned.The present embodiment is in high pressure When power failure occurs in cable differential protection check system ontology, can demagnetization operation be carried out to generator automatically, protect generator Will not occur because of the situation that high-tension cable differential protection check system ontology power failure occurs and generator is caused to be burned, So as to extend the service life of generator.Simple in structure, safety is good, and reliability is high.
Embodiments of the present invention are described above in conjunction with attached drawing, however, the implementation is not limited to the above embodiments, this field Those of ordinary skill can be with various changes and modifications may be made within the scope of the appended claims.

Claims (7)

1. the high-tension cable differential protection check system of no load condition, which is characterized in that including controller, voice prompting device, Communication module, degaussing switch device, high-tension cable differential protection check system ontology and for high-tension cable differential protection verification system Ontology of uniting provides the generator of mains power;
High-tension cable differential protection check system ontology includes 220KV busbares, 220KV including opening standby change circuit, opening the standby circuit that becomes Power cable differential protecting CT 1,220KV power cables, 220KV power cables differential protecting CT 2, A open standby change, 220KV electric power Cable differential protecting CT 3 and B open standby change;One end of 220KV power cables differential protecting CT 1 is connected on 220KV busbares, The other end of 220KV power cables differential protecting CT 1 is connected on one end of 220KV power cables, and 220KV power cables are differential One end of CT2 and one end of 220KV power cables differential protecting CT 3 is protected all to be connected on the other end of 220KV power cables; The other end of 220KV power cables differential protecting CT 2 is connected to A and opens on standby become;220KV power cables differential protecting CT 3 it is another One end is connected to B and opens on standby become;
The degaussing switch device includes the main break-make control module of No.1, No. two main break-make control modules and demagnetization module;It is described The input terminal of the input terminal of the main break-make control module of No.1, the input terminal of No. two main break-make control modules and demagnetization module is all distinguished It is connected on the power output end of generator;The output terminal and No. two main break-make control modules of the main break-make control module of No.1 Output terminal be respectively coupled on 220KV busbares;The voice prompting device, communication module, high-tension cable differential protection school It the control terminal of the main break-make control module of control terminal, No.1 of check system ontology, the control terminal of No. two main break-make control modules and goes out The control terminal of magnetic module is connect respectively with controller.
2. the high-tension cable differential protection check system of no load condition according to claim 1, which is characterized in that also wrap No.1 node and No. two nodes are included, it is right that the main break-make control module of No.1 includes No.1 left-handed opening, No.1 relay and No.1 Switch, No. two main break-make control modules include No. two left-handed openings, No. two relays and No. two right switches, the demagnetization module Including demagnetization left-handed opening, demagnetization relay, the right switch of demagnetization and de-excitation resistance;
The left end of the left end of the No.1 left-handed opening, the left end of No. two left-handed openings and demagnetization left-handed opening is connected to No.1 node On;The right end of the No.1 left-handed opening is connected to the left end of No.1 relay, and the right end of No.1 relay is connected to the No.1 right side and opens The left end of pass, the right end of the right switch of No.1 are connected on No. two nodes;The right end of No. two left-handed openings is connected to No. two relays The left end of device, the right end of No. two relays are connected to the left end of No. two right switches, and the right end of No. two right switches is connected to No. two sections Point on;Demagnetization left-handed opening right end is connected to the left end of demagnetization relay, and the right end of demagnetization relay is connected to the right switch of demagnetization Left end, the right end of the right switch of demagnetization are connected on de-excitation resistance;220KV busbares are connected on No. two nodes;The power supply of generator Output terminal is connected on No.1 node;
The control of the control terminal of the right switch of the control terminal of No.1 left-handed opening, the control terminal of No.1 relay, No.1, No. two left-handed openings End, the control of the control terminal of No. two relays, the control terminal, the control terminal, demagnetization relay of demagnetization left-handed opening of No. two right switches The control terminal of end and the right switch of demagnetization is connect respectively with controller.
3. the high-tension cable differential protection check system of no load condition according to claim 2, which is characterized in that demagnetization The demagnetization control of switching device is as follows:
If the main break-make control module of No.1 is completed since controller sends out No.1 open command to the main break-make control module of No.1 A length of T1 when disconnection needed for disconnection action is reacted, is opened if No. two main break-make control modules send out No. two open commands from controller Begin to No. two main break-make control modules to complete a length of T2 during the disconnection reaction needed for disconnection action, if demagnetization module is sent out from controller Go out demagnetization turn-on command and start to demagnetization module to complete a length of T3 during the conducting reaction needed for turn-on action;If degaussing switch device Time needed for the demagnetization switching of corresponding generator system is H;
When the main break-make control module conducting of No.1, No. two main break-make control modules are then off, at this time in controller Control under the value of disconnection reaction duration T2 of No. two main break-make control modules of detection and demagnetization module conducting reaction duration T3 Value;Calculate demagnetization module be conducting to No. two main break-make control modules disconnect between time difference H2, then H2=| T2-T3 |≤H; When back to back next time when to carry out demagnetization operation in the case of No. two main break-make control modules conductings, if when T2-T3 >=0 When, then sending out the H2 times internal controller after No. two open commands start to No. two main break-make control modules in controller will be right Demagnetization module sends out demagnetization turn-on command;If as T2-T3 < 0, two are sent out to No. two main break-make control modules in controller H2 times internal controller before number open command starts will send out demagnetization module demagnetization turn-on command;
When No. two main break-make control module conductings, the main break-make control module of No.1 is then off, at this time in controller Control under the value of disconnection reaction duration T1 of the detection main break-make control module of No.1 and demagnetization module conducting reaction duration T3 Value;Calculate demagnetization module be conducting to the main break-make control module of No.1 disconnect between time difference H1, then H1=| T1-T3 |≤H; When back to back next time when to carry out demagnetization operation in the case of the conducting of No.1 main break-make control module, if when T1-T3 >=0 When, then sending out the H1 times internal controller after No.1 open command starts to the main break-make control module of No.1 in controller will be right Demagnetization module sends out demagnetization turn-on command;If as T1-T3 < 0, one is sent out to the main break-make control module of No.1 in controller H1 times internal controller before number open command starts will send out demagnetization module demagnetization turn-on command.
4. the high-tension cable differential protection check system of no load condition according to claim 3, which is characterized in that examining When surveying the disconnection reaction duration T1 of the main break-make control module of No.1, under the control of the controller, No.1 left-handed opening and No.1 are first allowed Right switch all disconnects, and then detects the disconnection reaction duration of No.1 relay, and the disconnection reaction duration of the No.1 relay is T1;Then the right switch of No.1 left-handed opening and No.1 is all closed, and allow after having detected the disconnection reaction duration T1 of No.1 relay No.1 relay is off;
When duration T2 is reacted in the disconnection for detecting No. two main break-make control modules, under the control of the controller, No. two left sides is first allowed to be opened It closes and No. two right switches all disconnects, then detect the disconnection reaction duration of No. two relays, the disconnection reaction of No. two relays Duration is T2;Then the right switch of No. two left-handed openings and No. two is all closed after having detected the disconnection reaction duration T2 of No. two relays It closes, and No. two relays is allowed to be off;
When detecting demagnetization module conducting reaction duration T3, under the control of the controller, demagnetization left-handed opening and the demagnetization right side is first allowed to be opened Pass all disconnects, and then detects the closed reaction duration of demagnetization relay, the closed reaction duration of the demagnetization relay is T3;Inspection Surveyed after the closed reaction duration T3 of demagnetization relay and to be then all closed the right switch of demagnetization left-handed opening and demagnetization, and allow demagnetization after Electric appliance is off.
5. the high-tension cable differential protection check system of no load condition according to claim 3, which is characterized in that if one Number main break-make control module and No. two main break-make control modules are all in the demagnetization process in the case of conducting state, if T1 < T2 In demagnetization, the main break-make control module of No.1 will first disconnect Shi Ze before No. two main break-make control modules disconnect;If conversely, T1 During > T2 then in demagnetization, No. two main break-make control modules will first disconnect before the main break-make control module of No.1 disconnects.
6. the high-tension cable differential protection check system of no load condition according to claim 1, which is characterized in that high pressure Cable differential protection check system ontology differential protection verification the specific implementation process is as follows:
Start, a 6kV low-tension transformer is selected to carry out impact test, and enroll dash current;Then result of the test is analyzed, and is led to Other test methods are crossed to be verified;Then Switching impulse experiment is carried out under rated voltage to power cable;Then selection is surveyed Record point is at 220kV switchyard relay bungalow differential protection screens;Then standby become is opened B under rated voltage and carries out Switching impulse Record surge waveform is surveyed in experiment;Last shock wave shape compares and analyzes, and terminates after obtaining final result of the test.
7. the high-tension cable differential protection check system of no load condition according to claim 1, which is characterized in that without negative High-tension cable differential protection verification resolution policy is in the case of lotus:
1) before differential protection input, load test rheology is needed to draw polarity;In the low-pressure side three-phase shortcircuit of transformer, The power supply of 400V is added in from high-pressure side, using the direct impedance of transformer, obtains the current phase of the differential CT of cable, verification CT poles Property;
2) a flow-through test is carried out to cable differential protection both sides CT, to verify cable differential protecting CT polarity;
3) record transformer shock excitation is surveyed to shove to verify cable differential protecting CT polarity;It will when operation is impacted playing standby become Both sides secondary current needed for cable differential protection, which is led to, a little to be surveyed record, compares.
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