CN111624523A - System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system - Google Patents
System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system Download PDFInfo
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- CN111624523A CN111624523A CN202010491477.XA CN202010491477A CN111624523A CN 111624523 A CN111624523 A CN 111624523A CN 202010491477 A CN202010491477 A CN 202010491477A CN 111624523 A CN111624523 A CN 111624523A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a system and a method for checking differential protection polarity of a line of a wiring mode system of a generator-transformer unit, which comprises a generator, a main transformer, a generator-transformer set interval unit, a line unit and a transformer substation line interval unit, wherein the output end of the generator is connected with the transformer substation line interval unit through the main transformer, the generator-transformer set interval unit and the line unit.
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 differential protection polarity of a system line in a wiring mode of a generator-transformer unit.
Background
In the new construction and extension projects of the power plant, the wiring mode of a generator-transformer-line group unit is often adopted, and the wiring mode has the advantages of simple structure, low manufacturing cost and convenience for extension.
Because the line is connected with a power plant and a transformer substation, the distance is long, the capacitance of the line to the ground is large, and the test equipment is difficult to check the differential protection polarity of the line in advance by using a one-time through-flow method for the line upwelling. In the prior art, the polarity of the differential protection of the line is verified by utilizing load current after a generator is connected to the grid and has a load in the whole starting process, and the differential protection of the line is put into use after the protection polarity is correct. If the line differential protection polarity is wrong, the unit is required to be disconnected, the unit is connected to the network again after being corrected and is checked with load, the line differential protection can be put into the line differential protection formally until the line differential protection polarity is all correct, the phenomenon that the protection device is in misoperation or refusal operation caused by wrong configuration of the line differential protection polarity is avoided, the unit is connected to the network for a long time and has poor reliability, and a system and a method are required to be developed in sequence.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for checking the differential protection polarity of a line of a generator-transformer unit wiring mode system.
In order to achieve the above object, the system for checking differential protection polarity of a line of a power generation and transformation unit wiring mode system according to the present invention includes a power generator, a main transformer, a power generator and transformer set spacing unit, a line unit and a transformer substation line spacing unit, wherein an output end of the power generator is connected to the transformer substation line spacing unit through the main transformer, the power generator and transformer set spacing unit and the line unit.
The generator transformer group interval unit comprises a main transformer high-voltage side isolation disconnecting link, a main transformer high-voltage side grounding disconnecting link, a first current transformer, a first circuit breaker, a first line side isolation disconnecting link and a first line side grounding disconnecting link;
the main transformer is connected with the circuit unit through a main transformer high-voltage side isolation disconnecting link, a first circuit breaker and a first line side isolation disconnecting link in sequence, a first current transformer is installed on a circuit between the main transformer high-voltage side isolation disconnecting link and the first circuit breaker, one end of the main transformer high-voltage side grounding disconnecting link is connected with the circuit between the main transformer high-voltage side isolation disconnecting link and the first circuit breaker, the other end of the main transformer high-voltage side grounding disconnecting link is grounded, one end of the first line side grounding disconnecting link is connected with the circuit between the circuit unit and the first line side isolation disconnecting link, and the other end of the first line side grounding disconnecting link is grounded.
The transformer substation line spacing unit comprises a second line side isolation disconnecting link, a second line side grounding disconnecting link, a second current transformer, a second circuit breaker, a bus side isolation disconnecting link and a bus side grounding disconnecting link;
the circuit unit is connected with the bus-side isolation disconnecting link through a second circuit-side isolation disconnecting link and a second circuit breaker in sequence, a second current transformer is installed on a circuit between the second circuit breaker and the bus-side isolation disconnecting link, one end of a second circuit-side grounding disconnecting link is connected with the circuit between the circuit unit and the second circuit-side isolation disconnecting link, the other end of the second circuit-side grounding disconnecting link is grounded, one end of the bus-side grounding disconnecting link is connected with the circuit between the second circuit breaker and the bus-side isolation disconnecting link, and the other end of the bus-side grounding disconnecting link is grounded.
The invention discloses a method for verifying differential protection polarity of a line of a generator-transformer unit wiring mode system, which comprises the following steps of:
1) the generator has a whole set of starting conditions, short-circuit and no-load tests of the generator and the main transformer are completed, and the relevant protection of the generator-transformer set protection device is correctly put into use;
2) preparing for checking the differential protection polarity of the system line in the wiring mode of the generator-transformer unit, adjusting a main transformer high-voltage side isolation disconnecting link, a first line side isolation disconnecting link and a first circuit breaker to switch-on positions, and adjusting a main transformer high-voltage side grounding disconnecting link and a first line side grounding disconnecting link to switch-off positions; adjusting a second line side isolation disconnecting link, a bus side grounding disconnecting link and a second breaker to switch-on positions, and adjusting the second line side grounding disconnecting link and the bus side isolation disconnecting link to switch-off positions;
3) starting the generator, carrying out current rising operation on the generator, measuring the current on the high-voltage side of the main transformer by using a pincerlike phase meter, and stopping current rising when the current on the high-voltage side of the main transformer reaches 0.2A;
4) checking whether the amplitude and the phase of the three-phase current at the high-voltage side of the main transformer are correct by using a pincerlike phase meter, checking whether the amplitude and the phase sampled by all protection measuring devices connected into the three-phase current at the high-voltage side of the main transformer are correct, checking whether the differential current of a line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the high-voltage side of the transformer are correct, the amplitude and the phase sampled by the protection measuring devices connected into the three-phase current at the high-voltage side of the main transformer are correct, and the differential current of the line differential protection device is correct, turning to the step 6;
5) reducing the current of the generator to zero, withdrawing the generator, checking a voltage transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the main transformer, eliminating the defects, and then turning to the step 3);
6) checking whether the amplitude and the phase of the three-phase current at the side of the transformer substation are correct by using a pincerlike phase meter, checking whether the amplitude and the phase sampled by all protection measuring devices accessing the three-phase current at the side of the transformer substation are correct, and checking whether the differential current of a line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the side of the transformer substation are correct, the amplitude and the phase sampled by all protection measuring devices accessing the three-phase current at the side of the transformer substation are correct, and the differential current of the line differential protection device is correct, turning to the step 8); otherwise, go to step 7);
7) reducing the current of the generator to zero, quitting the generator, checking a voltage transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the transformer substation line side, eliminating the defect, and then turning to the step 3);
8) and reducing the current of the generator to zero, exiting the generator, correctly putting the line differential protection into operation, and recovering the system to the initial state to complete the verification of the polarity of the line differential protection system in the wiring mode of the generator-transformer unit.
The invention has the following beneficial effects:
when the system and the method for verifying the line differential protection polarity of the generator-transformer unit wiring mode system are in specific operation, the generator transformer set spacing unit is connected with the transformer substation line spacing unit through the line unit, the side, away from a bus, of a current transformer of the transformer substation line spacing is grounded in a short circuit mode through a bus side grounding disconnecting link, a generator is used as a high-capacity current source to conduct through flow on all the spacing units, the line differential protection polarity of the generator-transformer unit wiring mode system is verified, the verification of the generator-transformer unit wiring mode line differential protection polarity is completed before the circuit is powered on, the grid connection time of a unit is saved, and the verification reliability is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein G1 is a main transformer high-voltage side isolation switch, G11 is a main transformer high-voltage side grounding switch, CT1 is a first current transformer, DL1 is a first circuit breaker, G2 is a first line side isolation switch, G21 is a first line side grounding switch, G3 is a second line side isolation switch, G31 is a second line side grounding switch, CT2 is a second current transformer, DL2 is a second circuit breaker, G4 is a bus side isolation switch, G41 is a bus side grounding switch, W is a generator, and T is a main transformer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for checking the differential protection polarity of the line of the power generation and transformation line unit wiring mode system according to the present invention includes a generator W, a main transformer T, a generator transformer set interval unit, a line unit and a transformer substation line interval unit, wherein an output end of the generator W is connected to the transformer substation line interval unit through the main transformer T, the generator transformer set interval unit and the line unit.
The generator transformer group interval unit comprises a main transformer high-voltage side isolation disconnecting link G1, a main transformer high-voltage side grounding disconnecting link G1, a first current transformer CT1, a first circuit breaker DL1, a first line side isolation disconnecting link G2 and a first line side grounding disconnecting link G21; the main transformer T is connected with a line unit through a main transformer high-voltage side isolation disconnecting link G1, a first circuit breaker DL1 and a first line side isolation disconnecting link G2 in sequence, a first current transformer CT1 is installed on a line between a main transformer high-voltage side isolation disconnecting link G1 and a first circuit breaker DL1, one end of a main transformer high-voltage side grounding disconnecting link G11 is connected with a line between the main transformer high-voltage side isolation disconnecting link G1 and the first circuit breaker DL1, the other end of the main transformer high-voltage side grounding disconnecting link G11 is grounded, one end of the first line side grounding disconnecting link G21 is connected with a line between the line unit and the first line side isolation disconnecting link G2, and the other end of the first line side grounding disconnecting link G21 is grounded.
The transformer substation line spacing unit comprises a second line side isolation disconnecting link G3, a second line side grounding disconnecting link G31, a second current transformer CT2, a second circuit breaker DL2, a bus side isolation disconnecting link G4 and a bus side grounding disconnecting link G41; the line unit is connected with the bus side isolation disconnecting link G4 through a second line side isolation disconnecting link G3 and a second breaker DL2 in sequence, a second current transformer CT2 is installed on a line between the second breaker DL2 and the bus side isolation disconnecting link G4, one end of a second line side grounding disconnecting link G31 is connected with the line between the line unit and the second line side isolation disconnecting link G3, the other end of the second line side grounding disconnecting link G31 is grounded, one end of a bus side grounding disconnecting link G41 is connected with the line between the second breaker DL2 and the bus side isolation disconnecting link G4, and the other end of the bus side grounding disconnecting link G41 is grounded.
Referring to fig. 2, the method for verifying the differential protection polarity of the line of the generator-transformer unit connection mode system according to the present invention includes the following steps:
1) the generator W has a whole set of starting conditions, short-circuit and no-load tests of the generator W and the main transformer T are completed, and related protection of the generator-transformer set protection device is correctly put into use;
2) preparing for checking the polarity of the line differential protection of a system in a wiring mode of a generator-transformer unit, adjusting a main transformer high-voltage side isolation disconnecting link G1, a first line side isolation disconnecting link G2 and a first circuit breaker DL1 to switch-on positions, and adjusting a main transformer high-voltage side grounding disconnecting link G11 and a first line side grounding disconnecting link G21 to switch-off positions; adjusting a second line side isolation disconnecting link G3, a bus side grounding disconnecting link G41 and a second breaker DL2 to a switching-on position, and adjusting a second line side grounding disconnecting link G31 and a bus side isolation disconnecting link G4 to a switching-off position;
3) starting the generator W, performing current rising operation on the generator W, measuring the current on the high-voltage side of the main transformer T by using a pincerlike phase meter, and stopping current rising when the current on the high-voltage side of the main transformer T reaches 0.2A;
4) checking whether the amplitude and the phase of the three-phase current at the high-voltage side of the main transformer T are correct by using a pincerlike phase meter, checking whether the amplitude and the phase of all protection measuring devices connected with the three-phase current at the high-voltage side of the main transformer T, such as a line differential protection device, a main transformer protection device and a fault recorder, are correct, checking whether the differential current of the line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the high-voltage side of the transformer are correct, the amplitude and the phase of the protection measuring devices connected with the three-phase current at the high-voltage side of the main transformer are correct, and the differential current of the line differential protection device is correct, turning;
5) reducing the current of the generator W to zero, withdrawing the generator W, checking a voltage transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the main transformer T, eliminating the defects, and then turning to the step 3);
6) checking whether the amplitude and the phase of the three-phase current at the side of the transformer substation are correct by using a pincerlike phase meter, checking whether the amplitude and the phase of the protection measuring devices of the three-phase current at the side of the transformer substation, such as a line differential protection device and a fault recorder, sampled by all protection measuring devices of the three-phase current at the side of the transformer substation, are correct, checking whether the differential current of the line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the side of the transformer substation are correct, the amplitude and the phase of the protection measuring devices of the three-phase current at the side of the transformer substation, sampled by; otherwise, go to step 7);
7) reducing the current of the generator W to zero, quitting the generator W, checking a voltage transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the transformer substation line side, eliminating the defect, and then turning to the step 3);
8) and reducing the current of the generator W to zero, exiting the generator W, correctly putting the line differential protection into use, and recovering the system to the initial state to complete the verification of the polarity of the line differential protection system in the wiring mode of the generator-transformer unit.
The invention can verify the differential protection polarity of the line in the wiring mode of the generator-transformer unit, and can also verify the differential protection polarity of the line in other similar system wiring mode units, for example, the backup transformer is powered by other systems and the line system is not powered (a single bus system, 3/2 wiring system and the like).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a check-up system of generating and transforming line unit wiring mode system line differential protection polarity which characterized in that, includes generator (W), main transformer (T), generator transformer group interval unit, line unit and transformer substation's line interval unit, wherein, the output of generator (W) is connected with transformer substation's line interval unit through main transformer (T), generator transformer group interval unit and line unit.
2. The system for verifying the line differential protection polarity of the generator-transformer unit wiring mode system according to claim 1, wherein the generator-transformer group interval unit comprises a main transformer high-voltage side isolation disconnecting link (G1), a main transformer high-voltage side grounding disconnecting link (G1), a first current transformer (CT1), a first circuit breaker (DL1), a first line side isolation disconnecting link (G2) and a first line side grounding disconnecting link (G21);
the main transformer (T) is connected with a line unit through a main transformer high-voltage side isolation disconnecting link (G1), a first circuit breaker (DL1) and a first line side isolation disconnecting link (G2) in sequence, a first current transformer (CT1) is installed on a line between the main transformer high-voltage side isolation disconnecting link (G1) and the first circuit breaker (DL1), one end of the main transformer high-voltage side grounding disconnecting link (G11) is connected with the line between the main transformer high-voltage side isolation disconnecting link (G1) and the first circuit breaker (DL1), the other end of the main transformer high-voltage side grounding disconnecting link (G11) is grounded, one end of the first line side grounding disconnecting link (G21) is connected with the line between the line unit and the first line side isolation disconnecting link (G2), and the other end of the first line side grounding disconnecting link (G21) is grounded.
3. The system for verifying the differential protection polarity of the line of the transformer unit wiring way system according to claim 2, wherein the substation line partition unit comprises a second line-side isolation disconnecting link (G3), a second line-side grounding disconnecting link (G31), a second current transformer (CT2), a second circuit breaker (DL2), a bus-side isolation disconnecting link (G4) and a bus-side grounding disconnecting link (G41);
the line unit is connected with a bus side isolation disconnecting link (G4) through a second line side isolation disconnecting link (G3) and a second breaker (DL2) in sequence, a second current transformer (CT2) is installed on a line between the second breaker (DL2) and the bus side isolation disconnecting link (G4), one end of a second line side grounding disconnecting link (G31) is connected with the line between the line unit and the second line side isolation disconnecting link (G3), the other end of the second line side grounding disconnecting link (G31) is grounded, one end of a bus side grounding disconnecting link (G41) is connected with the line between the second breaker (DL2) and the bus side isolation disconnecting link (G4), and the other end of the bus side grounding disconnecting link (G41) is grounded.
4. A method for checking differential protection polarity of a line in a generator-transformer unit connection system, according to claim 3, the system for checking differential protection polarity of a line in a generator-transformer unit connection system comprises the following steps:
1) the generator (W) has a whole set of starting conditions, short-circuit and no-load tests of the generator (W) and the main transformer (T) are completed, and related protection of the generator-transformer set protection device is correctly put into use;
2) preparing for checking the polarity of the line differential protection of a system in a wiring mode of a generator-transformer unit, adjusting a main transformer high-voltage side isolation disconnecting link (G1), a first line side isolation disconnecting link (G2) and a first circuit breaker (DL1) to switch-on positions, and adjusting a main transformer high-voltage side grounding disconnecting link (G11) and a first line side grounding disconnecting link (G21) to switch-off positions; adjusting a second line side isolation disconnecting link (G3), a bus side grounding disconnecting link (G41) and a second breaker (DL2) to a switching-on position, and adjusting a second line side grounding disconnecting link (G31) and a bus side isolation disconnecting link (G4) to a switching-off position;
3) starting the generator (W), carrying out a current rising operation on the generator (W), measuring the current on the high-voltage side of the main transformer (T) by using a pincer-shaped phase meter, and stopping the current rising when the current on the high-voltage side of the main transformer (T) reaches 0.2A;
4) checking whether the amplitude and the phase of the three-phase current at the high-voltage side of the main transformer (T) are correct by using a pincerlike phase meter, checking whether the amplitude and the phase of the sample of all protection measuring devices connected into the three-phase current at the high-voltage side of the main transformer (T) are correct, checking whether the differential current of a line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the high-voltage side of the transformer are correct, the amplitude and the phase of the sample of the protection measuring devices connected into the three-phase current at the high-voltage side of the main transformer are correct, and the differential current of the line differential protection device is correct, turning;
5) reducing the current of the generator (W) to zero, withdrawing the generator (W), checking a voltage transformer secondary circuit with incorrect sampling amplitude and phase of the three-phase current at the high-voltage side of the main transformer (T), eliminating the defects, and then turning to the step 3);
6) checking whether the amplitude and the phase of the three-phase current at the side of the transformer substation are correct by using a pincerlike phase meter, checking whether the amplitude and the phase sampled by all protection measuring devices accessing the three-phase current at the side of the transformer substation are correct, and checking whether the differential current of a line differential protection device is correct, and when the amplitude and the phase of the three-phase current at the side of the transformer substation are correct, the amplitude and the phase sampled by all protection measuring devices accessing the three-phase current at the side of the transformer substation are correct, and the differential current of the line differential protection device is correct, turning to the step 8); otherwise, go to step 7);
7) reducing the current of the generator (W) to zero, quitting the generator (W), checking the sampling amplitude and the incorrect phase of the three-phase current at the side of the transformer substation line, eliminating the defects, and then turning to the step 3);
8) and reducing the current of the generator (W) to zero, quitting the generator (W), correctly putting the line differential protection into use, recovering the system to the initial state, and finishing the verification of the line differential protection polarity of the system in the wiring mode of the generator-transformer unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010491477.XA CN111624523A (en) | 2020-06-02 | 2020-06-02 | System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010491477.XA CN111624523A (en) | 2020-06-02 | 2020-06-02 | System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system |
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| CN111624523A true CN111624523A (en) | 2020-09-04 |
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| CN202010491477.XA Pending CN111624523A (en) | 2020-06-02 | 2020-06-02 | System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system |
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