CN113156340A - Calibration system and method for PT switching secondary circuit of double-bus wiring mode system - Google Patents
Calibration system and method for PT switching secondary circuit of double-bus wiring mode system Download PDFInfo
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- CN113156340A CN113156340A CN202110409547.7A CN202110409547A CN113156340A CN 113156340 A CN113156340 A CN 113156340A CN 202110409547 A CN202110409547 A CN 202110409547A CN 113156340 A CN113156340 A CN 113156340A
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Abstract
The invention discloses a system and a method for verifying PT switching secondary circuits of a double-bus connection mode system.
Description
Technical Field
The invention belongs to the technical field of power debugging and power testing, and relates to a system and a method for verifying PT switching secondary circuit of a double-bus wiring mode system.
Background
In the new construction and extension projects of a power plant, a double-bus wiring mode is often adopted, the wiring mode is high in reliability and flexibility, and a unit can be switched to another bus to operate when one bus breaks down or is overhauled.
For electrical components connected on a double-bus wiring mode system, when two groups of buses operate separately, in order to ensure that the voltages of a primary system and a secondary system of the two groups of buses keep corresponding so as to prevent the occurrence of protection or misoperation and failure of an automatic device, a secondary voltage loop of the protection and automatic device is required to be switched along with a main wiring. Two auxiliary contacts of the isolating switch are connected in parallel to start the switching intermediate relay, so that the automatic switching of the voltage loop is realized. Need test PT secondary voltage's exactness when two bus system receive power, but because only carry out the return circuit inspection to PT secondary circuit during the debugging, do not carry out system test, PT switches secondary circuit and often has the mistake, and the slight meeting of the condition causes the system to receive the electric delay, thereby the serious meeting of condition causes PT secondary short circuit to destroy primary equipment.
Disclosure of Invention
The present invention is directed to overcome the above drawbacks of the prior art, and provides a system and a method for verifying PT switched secondary circuit of a dual-bus connection system, which can verify PT switched secondary circuit of the dual-bus connection system.
In order to achieve the purpose, the calibration system for the PT switching secondary circuit of the double-bus connection mode system comprises an I bus PT partition unit connected with an I bus, a II bus PT partition unit connected with an II bus, a generator-transformer group partition unit connected with the I bus and the II bus, a line partition unit connected with the I bus and the II bus, and the I bus and the II bus connected through a bus connection partition unit.
The I female PT spacing unit comprises an I female PT, an I female isolation disconnecting link and an I female grounding disconnecting link, the I female PT is connected with one end of the I female isolation disconnecting link and one end of the I female grounding disconnecting link, the other end of the I female isolation disconnecting link is connected with an I bus, and the other end of the I female grounding disconnecting link is grounded.
The female PT interval unit of II includes the female PT of II, the female isolation switch of II and the female ground connection switch of II, and the female PT of II is connected with the one end of the female isolation switch of II and the one end of the female ground connection switch of II, and the other end of the female isolation switch of II is connected with the II generating line, and the other end ground connection of the female ground connection switch of II.
The generator-transformer unit interval unit comprises a generator, a main transformer, a first circuit breaker, a first I bus side isolation disconnecting link, a first II bus side isolation disconnecting link, a first bus side grounding disconnecting link, a main transformer side isolation disconnecting link, a first circuit breaker side grounding disconnecting link and a main transformer side grounding disconnecting link;
the generator is connected through the one end that becomes owner and become the side isolation switch and the one end that becomes owner side ground connection switch, the other end ground connection of owner side ground connection switch, the other end that becomes owner side isolation switch is connected with the one end of first circuit breaker side ground connection switch and the one end of first circuit breaker, the other end ground connection of first circuit breaker side ground connection switch, the other end of first circuit breaker and the one end of first bus side ground connection switch, the one end of first I bus side isolation switch and the one end of first II bus side isolation switch are connected, the other end ground connection of first bus side ground connection switch, the other end of first I bus side isolation switch is connected with the I generating line, the other end of first II bus side isolation switch is connected with the II generating line.
The line spacing unit comprises a second circuit breaker, a second I bus side isolation disconnecting link, a second II bus side isolation disconnecting link, a second bus side grounding disconnecting link, a line side isolation disconnecting link, a second circuit breaker side grounding disconnecting link and a line side grounding disconnecting link;
the bus I is connected with one end of a second bus I side isolation disconnecting link, the bus II is connected with one end of a second bus II side isolation disconnecting link, the other end of the second bus I side isolation disconnecting link is connected with the other end of the second bus II side isolation disconnecting link, one end of the second bus side grounding disconnecting link is connected with one end of a second circuit breaker, the other end of the second bus side grounding disconnecting link is grounded, the other end of the second circuit breaker is connected with one end of the second circuit breaker side grounding disconnecting link and one end of the line side isolation disconnecting link, the other end of the second circuit breaker side grounding disconnecting link is grounded, the other end of the line side isolation disconnecting link is connected with one ends of an external line and a line side grounding disconnecting link, and the other end of the line side grounding disconnecting link is grounded.
The bus-coupled interval unit comprises a third circuit breaker, a bus-side isolating disconnecting link I, a bus-side grounding disconnecting link I, a bus-side isolating disconnecting link II and a bus-side grounding disconnecting link II;
the I bus is connected with the II bus through the I bus side isolation disconnecting link, the female connector, the third circuit breaker and the II bus side isolation disconnecting link, one end of the I bus side grounding disconnecting link is connected with the female connector, the other end of the I bus side grounding disconnecting link is grounded, one end of the II bus side grounding disconnecting link is connected with a circuit between the II bus side isolation disconnecting link and the third circuit breaker, and the other end of the II bus side grounding disconnecting link is grounded.
A calibration method for PT switching secondary circuit of a double-bus wiring mode system comprises the following steps:
1) the I bus and the II bus are in a split state;
2) closing an I bus PT isolation disconnecting link and an II bus isolation disconnecting link, closing a first I bus side isolation disconnecting link and a second II bus side isolation disconnecting link, connecting a generator-transformer group spacing unit into an I bus through the I bus isolation disconnecting link, connecting a line spacing unit into an II bus through the II bus isolation disconnecting link, wherein secondary voltage of the generator-transformer group spacing unit is provided by the I bus PT, and secondary voltage of the line spacing unit is provided by the II bus PT;
3) connecting a three-phase voltage line of a relay protection tester into a first winding external secondary circuit of the I bus PT, starting the relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage;
4) checking whether the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct or not and whether the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero or not by using a pincerlike phase table, and when the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct and the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero, turning to the step 6), and otherwise, turning to the step 5);
5) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the I bus PT and the primary winding switching secondary circuit of the II bus PT, and turning to the step 3 after the defect processing is confirmed to be finished);
6) closing a third circuit breaker of the bus-coupled spacing unit, a bus-side isolating disconnecting switch I and a bus-side grounding disconnecting switch I, connecting a bus I and a bus II in parallel, and switching a secondary circuit between a bus I PT and a bus II in parallel;
7) starting a relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage;
8) checking whether the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and whether the phase sequence is correct by using a pincerlike phase table, and turning to the step 10) when the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and the phase sequence is correct, or turning to the step 9);
9) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the II mother PT, and turning to the step 7 after the defect processing is confirmed to be finished);
10) disconnecting the relay protection tester, disconnecting the third circuit breaker, the isolation disconnecting link at the bus I side and the grounding disconnecting link at the bus I side, and separating the bus I from the bus II;
11) switching other windings of the I mother PT and the II mother PT to all secondary loops, repeating the steps 3) to 10) until all windings of the I mother PT and the II mother PT are traversed, and then turning to the step 12);
12) disconnecting the first and second II parent side isolation disconnecting links, closing the first and second II parent side isolation disconnecting links, supplying the secondary voltage of the generator-transformer group interval unit by the II parent PT, and supplying the secondary voltage of the line interval unit by the I parent PT;
13) repeating the steps 3) to 11);
14) and finishing the calibration of the PT switching secondary loop of the double-bus wiring mode system.
The rated voltage of the second positive sequence is 57.74V.
The invention has the following beneficial effects:
according to the calibration system and the calibration method for the PT switching secondary circuit of the double-bus wiring mode system, during specific operation, a relay protection tester is used for pressurizing the PT switching secondary circuit, all the switching secondary circuits of the PT I bus and the PT II bus are systematically checked through switching operation, the checking work of the correctness of the PT switching secondary circuit of the double-bus wiring mode system is completed before the system is powered on, the subsequent system power-on test time is saved, the situations of errors, grounding and even short circuit of the secondary circuit are prevented, and the safety and the reliability are high.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the calibration system for PT switching secondary circuits of a dual-bus connection system according to the present invention includes a bus I PT interval unit, a bus I, a bus II PT interval unit, a generator-transformer group interval unit, a line interval unit, and a bus tie interval unit;
the bus spacing unit of the generator transformer substation is characterized in that the bus spacing unit of the generator transformer substation is connected with a bus I, the bus spacing unit of the generator transformer substation is connected with a bus II, the bus spacing unit of the generator transformer substation is connected with the bus I and the bus II, the line spacing unit is connected with the bus I and the bus II, and the bus I and the bus II are connected through the bus connection spacing unit.
The I mother PT interval unit comprises an I mother PT, an I mother isolation disconnecting link G41 and an I mother grounding disconnecting link G411, the I mother PT is connected with one end of the I mother isolation disconnecting link G41 and one end of the I mother grounding disconnecting link G411, the other end of the I mother isolation disconnecting link G41 is connected with an I bus, and the other end of the I mother grounding disconnecting link G411 is grounded.
The II mother PT interval unit comprises a II mother PT, a II mother isolation disconnecting link G51 and a II mother grounding disconnecting link G511, wherein the II mother PT is connected with one end of the II mother isolation disconnecting link G51 and one end of the II mother grounding disconnecting link G511, the other end of the II mother isolation disconnecting link G51 is connected with a II bus, and the other end of the II mother grounding disconnecting link G511 is grounded.
The generator-transformer group interval unit comprises a generator, a main transformer, a first circuit breaker DL1, a first I bus side isolation disconnecting link G11, a first II bus side isolation disconnecting link G12, a first bus side grounding disconnecting link G111, a main transformer side isolation disconnecting link G13, a first circuit breaker side grounding disconnecting link G131 and a main transformer side grounding disconnecting link G132; the generator is connected with one end of a main transformer side isolation disconnecting link G13 and one end of a main transformer side grounding disconnecting link G132 through a main transformer, the other end of the main transformer side grounding disconnecting link G132 is grounded, the other end of the main transformer side isolation disconnecting link G13 is connected with one end of a first circuit breaker side grounding disconnecting link G131 and one end of a first circuit breaker DL1, the other end of the first circuit breaker side grounding disconnecting link G131 is grounded, the other end of the first circuit breaker DL1 is connected with one end of a first bus side grounding disconnecting link G111, one end of a first I bus side isolation disconnecting link G11 and one end of a second II bus side isolation disconnecting link G12, the other end of the first bus side grounding disconnecting link G111 is grounded, the other end of the first I side isolation disconnecting link G11 is connected with a bus I, and the other end of the first II bus side isolation disconnecting link G12 is connected with a bus II.
The line spacing unit comprises a second circuit breaker DL2, a second I bus side isolation disconnecting link G21, a second II bus side isolation disconnecting link G22, a second bus side grounding disconnecting link G211, a line side isolation disconnecting link G23, a second circuit breaker side grounding disconnecting link G231 and a line side grounding disconnecting link G232; the I bus is connected with one end of a second I bus side isolation disconnecting link G21, the II bus is connected with one end of a second II bus side isolation disconnecting link G22, the other end of the second I bus side isolation disconnecting link G21 is connected with the other end of a second II bus side isolation disconnecting link G22, one end of a second bus side grounding disconnecting link G211 and one end of a second breaker DL2, the other end of the second bus side grounding disconnecting link G211 is grounded, the other end of a second breaker DL2 is connected with one end of a second breaker side grounding disconnecting link G231 and one end of a line side isolation disconnecting link G23, the other end of the second breaker side grounding disconnecting link G231 is grounded, the other end of the line side isolation disconnecting link G23 is connected with an external line and one end of a line side grounding disconnecting link G232, and the other end of the line side grounding disconnecting link G232 is grounded.
The bus-coupled interval unit comprises a third circuit breaker DL3, a bus-side isolating disconnecting link I G31, a bus-side grounding disconnecting link I G311, a bus-side isolating disconnecting link II G32 and a bus-side grounding disconnecting link II G321; the bus I is connected with the bus II through a bus I side isolation disconnecting link G31, a bus coupler, a third circuit breaker DL3 and a bus II side isolation disconnecting link G32, one end of the bus I side isolation disconnecting link G311 is connected with the bus coupler, the other end of the bus I side isolation disconnecting link G311 is grounded, one end of the bus II side isolation disconnecting link G321 is connected with a circuit between the bus II side isolation disconnecting link G32 and the third circuit breaker DL3, and the other end of the bus II side isolation disconnecting link G321 is grounded.
Referring to fig. 2, the method for verifying the PT switched secondary circuit of the dual-bus connection system according to the present invention includes the following steps:
1) PT switching secondary circuits are all formally connected, all circuit breakers, isolating disconnecting switches and grounding disconnecting switches in a double-bus wiring mode system are located at switch-off positions, all air switch fuses of a bus PT (potential transformer) and a bus PT (potential transformer) secondary voltage of a bus I and a bus II are disconnected (the PT secondary circuit voltage is prevented from being reversely connected back to the PT once), a PT switching device is electrified in a direct-current control mode, and a bus PT parallel screen handle is placed in a line-off state;
2) and carrying out preparation work of verifying the switching of the secondary loop of the double-bus wiring mode system PT.
Closing an I mother PT isolation disconnecting link G41 and a II mother isolation disconnecting link G51, closing a first I mother side isolation disconnecting link G11 of a generator-transformer group spacing unit, closing a second II mother side isolation disconnecting link G22 of a circuit spacing unit, connecting the generator-transformer group spacing unit into an I bus through an I mother isolation disconnecting link G41, connecting the circuit spacing unit into a II bus through an II mother isolation disconnecting link G51, supplying secondary voltage of the generator-transformer group spacing unit by an I mother PT, and supplying secondary voltage of the circuit spacing unit by an II mother PT;
3) connecting a three-phase voltage line of the relay protection tester into a primary winding external secondary circuit of the I bus PT, starting the relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage (57.74V);
4) checking whether the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct or not and whether the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero or not by using a pincerlike phase table, and when the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct and the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero, turning to the step 6), and otherwise, turning to the step 5);
5) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the I bus PT and the primary winding switching secondary circuit of the II bus PT, and turning to the step 3 after the defect processing is confirmed to be finished);
6) closing a third circuit breaker DL3 of the bus-coupled interval unit, a bus-side isolating disconnecting switch G31 of the bus I and a bus-side grounding disconnecting switch G311 of the bus I, connecting the bus I and the bus II in parallel, and switching a secondary circuit between the bus I PT and the bus II in parallel;
7) starting a relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage (57.74V);
8) checking whether the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and whether the phase sequence is correct by using a pincerlike phase table, and turning to the step 10) when the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and the phase sequence is correct, or turning to the step 9);
9) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the II mother PT, and turning to the step 7 after the defect processing is confirmed to be finished);
10) disconnecting the relay protection tester, disconnecting the third breaker DL3 of the bus-coupled spacing unit, the bus-side isolating disconnecting switch G31 and the bus-side grounding disconnecting switch G311 of the bus-coupled spacing unit, and separating the bus I from the bus II;
11) switching other windings of the I mother PT and the II mother PT to all secondary loops, repeating the steps 3) to 10) until all windings of the I mother PT and the II mother PT are traversed, and then turning to the step 12);
12) disconnecting the I mother side isolation disconnecting link G11 and the second II mother side isolation disconnecting link G22, closing the first II mother side isolation disconnecting link G12 and the second I mother side isolation disconnecting link G21, wherein the secondary voltage of the generator-transformer group interval unit is provided by the II mother PT, and the secondary voltage of the line interval unit is provided by the I mother PT;
13) repeating the steps 3) to 11);
14) and finishing the calibration of the PT switching secondary loop of the double-bus wiring mode system.
The invention can also carry out the calibration of PT switching secondary circuit for other similar system wiring mode units, such as a double-bus section wiring system and a multi-interval double-bus wiring mode system.
Claims (8)
1. The utility model provides a two check-up systems that female mode of connection system PT switches secondary circuit which characterized in that, includes that the female PT interval unit of I is connected with I generating line, and the female PT interval unit of II is connected with II generating line, sends out and becomes a group interval unit and be connected with I generating line and II generating line, and circuit interval unit is connected with I generating line and II generating line, is connected through female antithetical couplet interval unit between I generating line and the II generating line.
2. The calibration system for PT switching secondary circuit of dual-bus connection system as claimed in claim 1, wherein the IPt interval unit comprises an IPt, an IPt isolation switch (G41) and an IPt grounding switch (G411), the IPt is connected to one end of the IPt isolation switch (G41) and one end of the IPt grounding switch (G411), the other end of the IPt isolation switch (G41) is connected to the I bus, and the other end of the IPt grounding switch (G411) is grounded.
3. The calibration system for PT switching secondary circuit of dual-bus connection system as claimed in claim 1, wherein said II-bus PT interval unit comprises II-bus PT, II-bus isolation switch (G51) and II-bus grounding switch (G511), the II-bus PT is connected to one end of II-bus isolation switch (G51) and one end of II-bus grounding switch (G511), the other end of II-bus isolation switch (G51) is connected to II-bus, and the other end of II-bus grounding switch (G511) is grounded.
4. The verification system for PT switching secondary circuit of double-bus connection mode system according to claim 1, wherein the generator-transformer group interval unit comprises a generator, a main transformer, a first circuit breaker (DL1), a first busbar-side isolating disconnecting link (G11), a first busbar-side isolating disconnecting link (G12), a first busbar-side grounding disconnecting link (G111), a main transformer-side isolating disconnecting link (G13), a first circuit breaker-side grounding disconnecting link (G131) and a main transformer-side grounding disconnecting link (G132);
the generator is connected with one end of a main transformer side isolation disconnecting link (G13) and one end of a main transformer side grounding disconnecting link (G132) through a main transformer, the other end of the main transformer side grounding disconnecting link (G132) is grounded, the other end of the main transformer side isolation disconnecting link (G13) is connected with one end of a first breaker side grounding disconnecting link (G131) and one end of a first breaker (DL1), the other end of the first breaker side grounding disconnecting link (G131) is grounded, the other end of the first breaker (DL1) is connected with one end of a first bus side grounding disconnecting link (G111), one end of a first I bus side isolation disconnecting link (G11) and one end of a first II bus side isolation disconnecting link (G12), the other end of the first bus side grounding disconnecting link (G111) is grounded, the other end of the first I bus side isolation disconnecting link (G11) is connected with an I bus, and the other end of the first II bus side isolation disconnecting link (G12) is connected with a bus II.
5. The verification system for PT switching secondary circuit of dual-bus wiring system as claimed in claim 1, wherein the line spacing unit comprises a second breaker (DL2), a second I bus-side isolation switch (G21), a second II bus-side isolation switch (G22), a second bus-side grounding switch (G211), a line-side isolation switch (G23), a second breaker-side grounding switch (G231) and a line-side grounding switch (G232);
the I bus is connected with one end of a second I bus side isolation disconnecting link (G21), the II bus is connected with one end of a second II bus side isolation disconnecting link (G22), the other end of the second I bus side isolation disconnecting link (G21) is connected with the other end of the second II bus side isolation disconnecting link (G22), one end of a second bus side grounding disconnecting link (G211) and one end of a second breaker (DL2), the other end of the second bus side grounding disconnecting link (G211) is grounded, the other end of the second breaker (DL2) is connected with one end of a second breaker side grounding disconnecting link (G231) and one end of a line side isolation disconnecting link (G23), the other end of the second breaker side grounding disconnecting link (G231) is grounded, the other end of the line side isolation disconnecting link (G23) is connected with an external line and one end of a line side grounding disconnecting link (G232), and the other end of the line side grounding disconnecting link (G232) is grounded.
6. The calibration system for PT switching secondary circuit of dual-bus connection system as claimed in claim 1, wherein the bus-coupled interval unit comprises a third breaker (DL3), a bus-side isolating switch (G31), a bus-side grounding switch (G311), a bus-side isolating switch (G32) and a bus-side grounding switch (G321);
the I bus is connected with the II bus through an I bus side isolation disconnecting link (G31), a bus coupler, a third breaker (DL3) and an II bus side isolation disconnecting link (G32), one end of the I bus side grounding disconnecting link (G311) is connected with the bus coupler, the other end of the I bus side grounding disconnecting link (G311) is grounded, one end of the II bus side grounding disconnecting link (G321) is connected with a circuit between the II bus side isolation disconnecting link (G32) and the third breaker (DL3), and the other end of the II bus side grounding disconnecting link (G321) is grounded.
7. A calibration method for PT switching secondary loop of a double-bus wiring mode system is characterized by comprising the following steps:
1) the I bus and the II bus are in a split state;
2) closing an I mother PT isolation disconnecting link (G41) and a II mother isolation disconnecting link (G51), closing a first I mother side isolation disconnecting link (G11), closing a second II mother side isolation disconnecting link (G22), connecting the generator-transformer group spacing unit into an I bus through the I mother isolation disconnecting link (G41), connecting the line spacing unit into a II bus through the II mother isolation disconnecting link (G51), wherein the secondary voltage of the generator-transformer group spacing unit is provided by the I mother PT, and the secondary voltage of the line spacing unit is provided by the II mother PT;
3) connecting a three-phase voltage line of a relay protection tester into a first winding external secondary circuit of the I bus PT, starting the relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage;
4) checking whether the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct or not and whether the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero or not by using a pincerlike phase table, and when the amplitude and the phase of the three-phase voltage of all the secondary circuits switched by the first winding of the I mother PT are correct and the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is zero, turning to the step 6), and otherwise, turning to the step 5);
5) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the I bus PT and the primary winding switching secondary circuit of the II bus PT, and turning to the step 3 after the defect processing is confirmed to be finished);
6) closing a third breaker (DL3), a first bus side isolating disconnecting switch (G31) and a first bus side grounding disconnecting switch (G311) of the bus-coupled interval unit, connecting a first bus and a second bus in parallel, and switching a secondary circuit between a first bus PT and a second bus PT in parallel;
7) starting a relay protection tester to raise the three-phase voltage to a secondary positive sequence rated voltage;
8) checking whether the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and whether the phase sequence is correct by using a pincerlike phase table, and turning to the step 10) when the amplitude of the three-phase voltage of all the secondary circuits switched by the first winding of the II mother PT is the rated voltage and the phase sequence is correct, or turning to the step 9);
9) switching off the relay protection tester, checking and eliminating the primary winding switching secondary circuit of the II mother PT, and turning to the step 7 after the defect processing is confirmed to be finished);
10) the relay protection tester is disconnected, the third breaker (DL3), the bus-side isolating disconnecting switch (G31) and the bus-side grounding disconnecting switch (G311) are disconnected, and the bus I and the bus II are separated;
11) switching other windings of the I mother PT and the II mother PT to all secondary loops, repeating the steps 3) to 10) until all windings of the I mother PT and the II mother PT are traversed, and then turning to the step 12);
12) disconnecting the I parent side isolation disconnecting link (G11) and the second II parent side isolation disconnecting link (G22), closing the first II parent side isolation disconnecting link (G12) and the second I parent side isolation disconnecting link (G21), wherein the secondary voltage of the generator-transformer group interval unit is provided by the II parent PT, and the secondary voltage of the line interval unit is provided by the I parent PT;
13) repeating the steps 3) to 11);
14) and finishing the calibration of the PT switching secondary loop of the double-bus wiring mode system.
8. The method for verifying the PT switching secondary circuit of the dual-bus connection mode system as claimed in claim 7, wherein the rated voltage of the secondary positive sequence is 57.74V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110409547.7A CN113156340A (en) | 2021-04-16 | 2021-04-16 | Calibration system and method for PT switching secondary circuit of double-bus wiring mode system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866483A (en) * | 2021-10-20 | 2021-12-31 | 国网宁夏电力有限公司宁东供电公司 | Automatic checking method and system for secondary voltage of transformer substation |
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| CN108899900A (en) * | 2018-07-17 | 2018-11-27 | 国网湖南省电力有限公司 | Transforming plant protecting and observing and controlling site secondary device voltage are side by side and switching method |
| CN111624426A (en) * | 2020-06-02 | 2020-09-04 | 西安热工研究院有限公司 | System and method for verifying bus differential protection polarity in double-bus system wiring mode |
| CN111913060A (en) * | 2020-07-06 | 2020-11-10 | 西安热工研究院有限公司 | Checking system and method for checking differential protection polarity through main transformer reverse power transmission load |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108899900A (en) * | 2018-07-17 | 2018-11-27 | 国网湖南省电力有限公司 | Transforming plant protecting and observing and controlling site secondary device voltage are side by side and switching method |
| CN111624426A (en) * | 2020-06-02 | 2020-09-04 | 西安热工研究院有限公司 | System and method for verifying bus differential protection polarity in double-bus system wiring mode |
| CN111913060A (en) * | 2020-07-06 | 2020-11-10 | 西安热工研究院有限公司 | Checking system and method for checking differential protection polarity through main transformer reverse power transmission load |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113866483A (en) * | 2021-10-20 | 2021-12-31 | 国网宁夏电力有限公司宁东供电公司 | Automatic checking method and system for secondary voltage of transformer substation |
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