CN111323670A - Transformer differential protection polarity test system and method - Google Patents
Transformer differential protection polarity test system and method Download PDFInfo
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- CN111323670A CN111323670A CN202010286574.5A CN202010286574A CN111323670A CN 111323670 A CN111323670 A CN 111323670A CN 202010286574 A CN202010286574 A CN 202010286574A CN 111323670 A CN111323670 A CN 111323670A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The invention discloses a system and a method for testing differential protection polarity of a transformer, which comprises a high-voltage standby variable high-voltage side bus, a high-voltage standby variable high-voltage side interval, a high-voltage standby variable high-voltage station bus standby power supply incoming line interval, a generating set high-voltage station bus, a capacitor load combination, a high-voltage station bus voltage transformer, a feeder circuit breaker group, a capacitor load combination, a first differential protection device and a second differential protection device, wherein the high-voltage standby variable high-voltage side interval comprises a first isolation disconnecting link, a high-voltage standby variable high-voltage side circuit breaker, a first current transformer and a second current transformer, the high-voltage station bus standby power supply incoming line interval comprises a high-voltage station bus standby power supply incoming line breaker, a fourth current transformer, a third current transformer and a high-voltage station bus standby power supply incoming line voltage transformer, and can realize the differential protection polarity test of the transformer, the universality is strong, and the safety is high.
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 testing differential protection polarity of a transformer.
Background
The power plant is usually configured with the reserve change of high pressure as power plant backup power, and the reserve change of high pressure low pressure side is connected to high pressure mill with the generating line through stand-by power service inlet wire switch, and when high pressure mill becomes unable to provide the power for high pressure mill with the generating line, accessible high pressure is reserve to become it and provides the power.
When a power station reversely transmits power for the first time and receives power for a plant, a phasor test is required to test whether the polarity of each differential protection is correct, and a line differential and a bus differential can be tested through the circulation current of a network side system or the capacitive current of a long line. Therefore, it is of great significance to find a system and a method for testing the differential protection polarity of the transformer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for testing the differential protection polarity of a transformer.
In order to achieve the above object, the differential protection polarity test system of the transformer of the invention comprises a high-voltage standby variable high-voltage side bus, a high-voltage standby variable high-voltage side interval, a high-voltage standby variable high-voltage station bus standby power supply incoming line interval, a generating set high-voltage station bus, a capacitor load combination, a high-voltage station bus voltage transformer, a feeder circuit breaker group, a capacitor load combination, a first differential protection device and a second differential protection device, wherein the high-voltage standby variable high-voltage side interval comprises a first isolation knife switch, a second isolation knife switch, a high-voltage standby variable high-voltage side circuit breaker, a first current transformer and a second current transformer, the high-voltage station bus standby power supply incoming line interval comprises a high-voltage station bus standby power supply incoming line breaker, a fourth current transformer, a third current transformer and a high-voltage station bus standby power supply incoming line voltage transformer;
the high-voltage standby high-voltage side bus is connected with a high-voltage station bus of the generating set through a first isolation disconnecting link, a high-voltage standby high-voltage side circuit breaker, a second isolation disconnecting link, a high-voltage standby transformer and a high-voltage station bus standby power incoming line circuit breaker;
the first differential protection device is connected with the secondary side of the first current transformer and the secondary side of the fourth current transformer, and the second differential protection device is connected with the secondary side of the second current transformer and the secondary side of the third current transformer.
The capacitor load combination comprises a plurality of capacitor loads, the feeder circuit breaker group comprises a plurality of feeder circuit breakers, one capacitor load corresponds to one feeder circuit breaker, and the capacitor loads are connected with a high-voltage station service bus of the generator set through the corresponding feeder circuit breakers.
High-voltage side protection level current transformer current of high-voltage standby transformer
Wherein S is the total capacity of the capacitor load combination; u is the voltage of the high-voltage standby variable high-voltage side bus; and n is the transformation ratio of the high-voltage side protection level current transformer of the high-voltage standby transformer.
The invention relates to a method for testing the differential protection polarity of a transformer, which comprises the following steps:
1) carrying out early preparation work of differential protection polarity test;
2) adjusting the high-voltage standby variable high-voltage side interval to a hot standby state;
3) closing a high-voltage standby transformer high-voltage side circuit breaker, and performing a full-voltage impact test on a high-voltage standby transformer;
4) checking and judging whether the voltage amplitude and the phase sequence of the voltage transformer of the standby power supply inlet line of the high-voltage station bus are correct, and if so, turning to the step 5), otherwise, turning to the step 6);
5) closing the incoming line breaker of the standby power supply of the high-voltage station bus, performing full-voltage impact on the high-voltage station bus of the generator set, and then turning to the step 7);
6) disconnecting the high-voltage standby variable high-voltage side circuit breaker, checking and eliminating defects, and then turning to the step 3);
7) checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer are correct, and if so, turning to the step 8), otherwise, turning to the step 9);
8) closing the feeder circuit breakers in sequence, performing full-voltage impact on the capacitor load combination, and then turning to the step 10);
9) disconnecting the incoming line breaker of the bus standby power supply for the high-voltage plant, checking and eliminating defects, and then turning to the step 5);
10) checking whether the differential protection polarity of the first differential protection device and the second differential protection device is correct, and turning to the step 12) when the differential protection polarity of the first differential protection device and the second differential protection device is correct, or turning to the step 11);
11) disconnecting each feeder circuit breaker, the high-voltage station bus standby power supply incoming line circuit breaker and the high-voltage standby variable high-voltage side circuit breaker, checking and eliminating defects, and then turning to the step 3);
12) the differential protection polarity test ends.
The specific operation of the step 1) is as follows:
completing the installation and debugging work of all primary equipment and secondary equipment in the current power receiving range; and adjusting the high-voltage standby high-voltage side bus to a live operation state.
The specific operation of the step 2) is as follows:
closing the first isolation switch and the second isolation switch through remote control; the first isolation knife switch and the second isolation knife switch are ensured to be in the switch-on position in the local place and the remote place.
The specific operation of checking and judging whether the voltage amplitude and the phase sequence of the voltage transformer of the standby power supply inlet line of the high-voltage station bus are correct in the step 4) is as follows:
checking the secondary side voltage amplitude of the high-voltage station bus standby power supply incoming line voltage transformer, and judging whether the three-phase voltage amplitude of the secondary side of the high-voltage station bus standby power supply incoming line voltage transformer is the primary side voltage of the high-voltage station bus standby power supply incoming line voltage transformer divided by the transformation ratio of the high-voltage station bus standby power supply incoming line voltage transformer, and whether the zero-sequence voltage is zero; and checking the secondary side voltage phase sequence of the high-voltage station bus standby power supply line voltage transformer, and judging whether the three-phase voltage of the high-voltage station bus standby power supply line voltage transformer is a positive phase sequence.
The specific process of checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer are correct in the step 7) is as follows:
checking the secondary side voltage amplitude of the bus voltage transformer for the high voltage plant, and judging whether the three-phase voltage amplitude of the secondary side of the bus voltage transformer for the high voltage plant is the primary side voltage of the bus voltage transformer for the high voltage plant divided by the transformation ratio of the bus voltage transformer for the high voltage plant and whether the zero-sequence voltage is zero; and checking the secondary side voltage phase sequence of the bus voltage transformer for the high-voltage plant, and judging whether the three-phase voltage of the bus voltage transformer for the high-voltage plant is in a positive phase sequence.
In step 10), when the differential protection differential flow of the first differential protection device and the second differential protection device is zero, the differential protection polarity of the first differential protection device and the second differential protection device is correct.
The invention has the following beneficial effects:
the invention relates to a transformer differential protection polarity test system and a method, wherein during specific operation, a capacitor load combination is used as a high-voltage station load, the capacitor load is connected with a high-voltage station bus of a generator set through a feeder circuit breaker, and whether the differential protection polarity of a high-voltage standby transformer is correct or not is tested through a first differential protection device and a second differential protection device, wherein after the whole capacitor load combination is put into operation, the current of the high-voltage standby transformer high-voltage side of the differential protection device is more than 15 mA. The capacitor load combination is used as a high-voltage station load, the high-voltage standby variable differential protection polarity test of the load in a station does not need to be organized, the primary reverse power transmission progress of a power plant is accelerated, the practicability and the universality are high, the capacitor load combination is suitable for testing the differential protection polarity of the transformer when a main transformer and a high-voltage station transformer of the power plant are reversely transmitted, and the capacitor load combination is convenient to popularize and use on site.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein, 1 is a high-voltage standby variable high-voltage side bus, 2 is a high-voltage standby variable high-voltage side interval, 3 is a high-voltage standby variable, 4 is a high-voltage station bus standby power supply incoming line interval, 5 is a generating set high-voltage station bus, 6 is a high-voltage station bus voltage transformer, 7 is a capacitor load combination, 8 is a first differential protection device, 9 is a second differential protection device, and 10 is a feeder circuit breaker, 2-1 is a first isolation disconnecting link, 2-2 is a first current transformer, 2-3 is a second current transformer, 2-4 is a high-voltage standby variable high-voltage side circuit breaker, 2-5 is a second isolation disconnecting link, 4-1 is a high-voltage station bus standby power supply incoming line voltage transformer, 4-2 is a third current transformer, 4-3 is a fourth current transformer, and 4-4 is a high-voltage station bus standby power supply incoming line circuit breaker.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the differential protection polarity test system of the transformer comprises a high-voltage standby transformer high-voltage side bus 1, a high-voltage standby transformer high-voltage side interval 2, a high-voltage standby transformer 3, a high-voltage station bus standby power supply incoming line interval 4, a generator set high-voltage station bus 5, a capacitor load combination 7, a high-voltage station bus voltage transformer 6, a feeder breaker group, a capacitor load combination 7, a first differential protection device 8 and a second differential protection device 9, wherein the high-voltage standby transformer high-voltage side interval 2 comprises a first isolation disconnecting link 2-1, a second isolation disconnecting link 2-5, a high-voltage standby transformer high-voltage side circuit breaker 2-4, a first current transformer 2-2 and a second current transformer 2-3, the high-voltage station bus standby power supply incoming line interval 4 comprises a high-voltage station bus standby power supply incoming line breaker 4-4, a high-voltage station, A fourth current transformer 4-3, a third current transformer 4-2 and a high-voltage station bus standby power supply line voltage transformer 4-1; the high-voltage standby transformer high-voltage side bus 1 is connected with a generating set high-voltage station bus 5 through a first isolation disconnecting link 2-1, a high-voltage standby transformer high-voltage side circuit breaker 2-4, a second isolation disconnecting link 2-5, a high-voltage standby transformer 3 and a high-voltage station bus standby power incoming line circuit breaker 4-4, a capacitor load combination 7 is connected with the generating set high-voltage station bus 5 through a feeder circuit breaker group, a high-voltage station bus voltage transformer 6 is installed on the generating set high-voltage station bus 5, a first current transformer 2-2 and a second current transformer 2-3 are installed on a line between the first isolation disconnecting link 2-1 and the high-voltage standby transformer high-voltage side circuit breaker 2-4, a high-voltage station bus standby power incoming line voltage transformer 4-1, a third current transformer 4-2 and a fourth current transformer 4-3 are installed on the high-voltage station bus standby power incoming line circuit breaker 4-4 4, the line between the high-voltage standby transformer 3; the first differential protection device 8 is connected with the secondary side of the first current transformer 2-2 and the secondary side of the fourth current transformer 4-3, and the second differential protection device 9 is connected with the secondary side of the second current transformer 2-3 and the secondary side of the third current transformer 4-2.
The capacitor load combination 7 comprises a plurality of capacitor loads, the feeder circuit breaker group comprises a plurality of feeder circuit breakers 10, one capacitor load corresponds to one feeder circuit breaker 10, and the capacitor loads are connected with the high-voltage service bus 5 of the generator set through the corresponding feeder circuit breaker 10.
High-voltage side protection level current transformer current of high-voltage standby transformer 3
Wherein S is the total capacity of the capacitor load combination 7; u is the voltage of the high-voltage standby variable high-voltage side bus 1; and n is the transformation ratio of the high-voltage side protection level current transformer of the high-voltage standby transformer 3.
Referring to fig. 2, the method for testing the polarity of the differential protection of the transformer according to the present invention includes the following steps:
1) carrying out early preparation work of differential protection polarity test;
2) adjusting the high-voltage standby variable high-voltage side interval 2 to a hot standby state;
3) closing the high-voltage standby transformer high-voltage side circuit breakers 2-4, and performing a full-voltage impact test on the high-voltage standby transformer 3;
4) checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus standby power supply incoming line voltage transformer 4-1 are correct or not, and when the voltage amplitude and the phase sequence of the high-voltage station bus standby power supply incoming line voltage transformer 4-1 are correct, turning to the step 5), otherwise, turning to the step 6);
5) closing a high-voltage station bus standby power incoming line breaker 4-4, performing full-voltage impact on a high-voltage station bus 5 of the generator set, and then turning to the step 7);
6) disconnecting the high-voltage standby variable high-voltage side circuit breaker 2-4, checking and eliminating defects, and then turning to the step 3);
7) checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer 6 are correct, and if so, turning to the step 8), otherwise, turning to the step 9);
8) closing the feeder circuit breakers 10 in sequence, performing full-voltage impact on the capacitor load combination 7, and then turning to the step 10);
9) disconnecting a high-voltage station bus standby power incoming line breaker 4-4, checking and eliminating defects, and then turning to the step 5);
10) checking whether the differential protection polarity of the first differential protection device 8 and the second differential protection device 9 is correct, and if the differential protection polarity of the first differential protection device 8 and the second differential protection device 9 is correct, turning to the step 12), otherwise, turning to the step 11);
11) disconnecting each feeder circuit breaker 10, the high-voltage station bus standby power supply incoming line circuit breakers 4-4 and the high-voltage standby variable high-voltage side circuit breakers 2-4, checking and eliminating defects, and then turning to the step 3);
12) the differential protection polarity test ends.
The specific operation of the step 1) is as follows: completing the installation and debugging work of all primary equipment and secondary equipment in the current power receiving range; and adjusting the high-voltage standby variable high-voltage side bus 1 to a live operation state.
The specific operation of the step 2) is as follows: closing the first isolation switch 2-1 and the second isolation switch 2-5 through remote control; the first isolation switch 2-1 and the second isolation switch 2-5 are ensured to be in the switching-on position in the local place and in the remote place.
The specific operation of checking and judging whether the voltage amplitude and the phase sequence of the voltage transformer 4-1 for the standby power supply inlet line of the high-voltage station bus are correct in the step 4) is as follows: checking the secondary side voltage amplitude of the high-voltage station bus standby power supply line-inlet voltage transformer 4-1, and judging whether the three-phase voltage amplitude of the secondary side of the high-voltage station bus standby power supply line-inlet voltage transformer 4-1 is the primary side voltage of the high-voltage station bus standby power supply line-inlet voltage transformer 4-1 divided by the transformation ratio of the high-voltage station bus standby power supply line-inlet voltage transformer 4-1 and whether the zero-sequence voltage is zero; and (3) checking the secondary side voltage phase sequence of the high-voltage station bus standby power supply line voltage transformer 4-1, and judging whether the three-phase voltage of the high-voltage station bus standby power supply line voltage transformer 4-1 is a positive phase sequence.
The specific process of checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer 6 are correct in the step 7) is as follows: checking the secondary side voltage amplitude of the high voltage station bus voltage transformer 6, and judging whether the three-phase voltage amplitude of the secondary side of the high voltage station bus voltage transformer 6 is the primary side voltage of the high voltage station bus voltage transformer 6 divided by the transformation ratio of the high voltage station bus voltage transformer 6 and whether the zero-sequence voltage is zero; and (3) checking the secondary side voltage phase sequence of the bus voltage transformer 6 for the high-voltage plant, and judging whether the three-phase voltage of the bus voltage transformer 6 for the high-voltage plant is in a positive phase sequence.
In step 10), when the differential protection differential current of the first differential protection device 8 and the second differential protection device 9 is zero, the differential protection polarity of the first differential protection device 8 and the second differential protection device 9 is correct.
The first differential protection device 8 performs a transformer dynamic differential protection polarity test through the current polarity detected by the first current transformer 2-2 and the current polarity detected by the fourth current transformer 4-3, and the second differential protection device 9 performs a transformer dynamic differential protection polarity test through the current polarity detected by the second current transformer 2-3 and the current polarity detected by the third current transformer 4-2.
Claims (9)
1. A transformer differential protection polarity test system is characterized by comprising a high-voltage standby transformer high-voltage side bus (1), a high-voltage standby transformer high-voltage side interval (2), a high-voltage standby transformer (3), a high-voltage station bus standby power supply incoming line interval (4), a generating set high-voltage station bus (5), a capacitor load combination (7), a high-voltage station bus voltage transformer (6), a feeder circuit breaker group, a capacitor load combination (7), a first differential protection device (8) and a second differential protection device (9), wherein the high-voltage standby transformer high-voltage side interval (2) comprises a first isolation disconnecting link (2-1), a second isolation disconnecting link (2-5), a high-voltage standby transformer high-voltage side circuit breaker (2-4), a first current transformer (2-2) and a second current transformer (2-3), and the high-voltage station bus standby power supply incoming line interval (4) comprises a high-voltage station bus standby power supply incoming line breaker (4-4), a fourth current transformer (4-3), a third current transformer (4-2) and a high-voltage station bus standby power supply line voltage transformer (4-1);
a high-voltage standby high-voltage side bus (1) is connected with a high-voltage station bus (5) of a generating set through a first isolation disconnecting link (2-1), a high-voltage standby high-voltage side circuit breaker (2-4), a second isolation disconnecting link (2-5), a high-voltage standby transformer (3) and a high-voltage station bus standby power incoming line circuit breaker (4-4), a capacitor load combination (7) is connected with the high-voltage station bus (5) of the generating set through a feeder circuit breaker group, a high-voltage station bus voltage transformer (6) is installed on the high-voltage station bus (5) of the generating set, a first current transformer (2-2) and a second current transformer (2-3) are installed on a line between the first isolation disconnecting link (2-1) and the high-voltage standby high-voltage side circuit breaker (2-4), and a high-voltage station bus standby power incoming line voltage transformer (4-1), The third current transformer (4-2) and the fourth current transformer (4-3) are arranged on a line between the incoming line breaker (4-4) of the bus standby power supply for the high-voltage plant and the high-voltage standby transformer (3);
the first differential protection device (8) is connected with the secondary side of the first current transformer (2-2) and the secondary side of the fourth current transformer (4-3), and the second differential protection device (9) is connected with the secondary side of the second current transformer (2-3) and the secondary side of the third current transformer (4-2).
2. The transformer differential protection polarity test system according to claim 1, characterized in that the capacitor load combination (7) comprises a number of capacitor loads and the feeder breaker group comprises a number of feeder breakers (10), wherein one capacitor load corresponds to one feeder breaker (10), wherein the capacitor loads are connected to the generator set high voltage service bus (5) via the corresponding feeder breaker (10).
3. The transformer differential protection polarity test system according to claim 1, characterized in that the high-side protection level current transformer current of the high-voltage backup transformer (3)
Wherein S is the total capacity of the capacitor load combination (7); u is high voltage standbyThe voltage of the high voltage side bus (1) is increased; and n is the transformation ratio of the high-voltage side protection level current transformer of the high-voltage standby transformer (3).
4. A method for testing the polarity of differential protection of a transformer is characterized by comprising the following steps:
1) carrying out early preparation work of differential protection polarity test;
2) adjusting the high-voltage standby variable high-voltage side interval (2) to a hot standby state;
3) closing the high-voltage standby transformer high-voltage side circuit breakers (2-4), and carrying out a full-voltage impact test on the high-voltage standby transformer (3);
4) checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus standby power supply incoming line voltage transformer (4-1) are correct or not, if so, turning to the step 5, and otherwise, turning to the step 6);
5) closing a high-voltage station bus standby power incoming line breaker (4-4), performing full-voltage impact on a generator set high-voltage station bus (5), and then turning to the step 7);
6) disconnecting the high-voltage standby variable high-voltage side circuit breaker (2-4), checking and eliminating defects, and then turning to the step 3);
7) checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer (6) are correct or not, if so, turning to the step 8), and if not, turning to the step 9);
8) closing the feeder circuit breakers (10) in sequence, performing full-voltage impact on the capacitor load combination (7), and then turning to the step 10);
9) disconnecting a high-voltage station bus standby power incoming line breaker (4-4), checking and eliminating defects, and then turning to the step 5);
10) checking whether the differential protection polarity of the first differential protection device (8) and the second differential protection device (9) is correct, and turning to the step 12 when the differential protection polarity of the first differential protection device (8) and the second differential protection device (9) is correct, or turning to the step 11) otherwise;
11) disconnecting each feeder circuit breaker (10), the high-voltage station bus standby power supply incoming line circuit breakers (4-4) and the high-voltage standby variable high-voltage side circuit breakers (2-4), checking and eliminating defects, and then turning to the step 3);
12) the differential protection polarity test ends.
5. The method for testing the polarity of the differential protection of the transformer according to claim 4, wherein the specific operations of step 1) are as follows:
completing the installation and debugging work of all primary equipment and secondary equipment in the current power receiving range; and adjusting the high-voltage standby variable high-voltage side bus (1) to a live-line operation state.
6. The method for testing the polarity of the differential protection of the transformer according to claim 4, wherein the specific operations of step 2) are as follows:
closing a first isolation switch (2-1) and a second isolation switch (2-5) through remote control; the first isolation knife switch (2-1) and the second isolation knife switch (2-5) are ensured to be in the switching-on position both on the spot and in the remote place.
7. The method for testing the polarity of the differential protection of the transformer according to claim 4, wherein the specific operation of checking and judging whether the voltage amplitude and the phase sequence of the inlet line voltage transformer (4-1) of the standby power supply of the high-voltage service bus are correct in the step 4) comprises the following steps:
checking the secondary side voltage amplitude of the high-voltage station bus standby power supply line-inlet voltage transformer (4-1), and judging whether the three-phase voltage amplitude of the secondary side of the high-voltage station bus standby power supply line-inlet voltage transformer (4-1) is the primary side voltage of the high-voltage station bus standby power supply line-inlet voltage transformer (4-1) divided by the transformation ratio of the high-voltage station bus standby power supply line-inlet voltage transformer (4-1) and whether the zero-sequence voltage is zero; and (3) checking the secondary side voltage phase sequence of the high-voltage station bus standby power supply line voltage transformer (4-1), and judging whether the three-phase voltage of the high-voltage station bus standby power supply line voltage transformer (4-1) is a positive phase sequence.
8. The method for testing the polarity of the differential protection of the transformer according to claim 4, wherein the specific process of checking and judging whether the voltage amplitude and the phase sequence of the high-voltage station bus voltage transformer (6) are correct in the step 7) comprises the following steps:
checking the secondary side voltage amplitude of the high-voltage station bus voltage transformer (6), and judging whether the three-phase voltage amplitude of the secondary side of the high-voltage station bus voltage transformer (6) is the primary side voltage of the high-voltage station bus voltage transformer (6) divided by the transformation ratio of the high-voltage station bus voltage transformer (6) and whether the zero-sequence voltage is zero; and (3) checking the secondary side voltage phase sequence of the bus voltage transformer (6) for the high-voltage plant, and judging whether the three-phase voltage of the bus voltage transformer (6) for the high-voltage plant is the positive phase sequence.
9. The method for testing the polarity of the differential protection of the transformer according to claim 4, wherein in step 10), when the differential protection differential current of the first differential protection device (8) and the second differential protection device (9) is zero, the polarity of the differential protection of the first differential protection device (8) and the second differential protection device (9) is correct.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010286574.5A CN111323670A (en) | 2020-04-13 | 2020-04-13 | Transformer differential protection polarity test system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327152A (en) * | 2020-10-26 | 2021-02-05 | 西安热工研究院有限公司 | FC switch on-time and time-sharing test and zero sequence protection setting system and method |
| CN112345938A (en) * | 2020-12-01 | 2021-02-09 | 中广核工程有限公司 | Test method for emergency diesel generator set of nuclear power plant |
| CN113964784A (en) * | 2021-10-28 | 2022-01-21 | 西安热工研究院有限公司 | System and method for single-phase one-time through-current correction of differential protection polarity and configuration of motor |
-
2020
- 2020-04-13 CN CN202010286574.5A patent/CN111323670A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327152A (en) * | 2020-10-26 | 2021-02-05 | 西安热工研究院有限公司 | FC switch on-time and time-sharing test and zero sequence protection setting system and method |
| CN112327152B (en) * | 2020-10-26 | 2023-12-15 | 西安热工研究院有限公司 | FC switch on-off time testing and zero sequence protection setting system and method thereof |
| CN112345938A (en) * | 2020-12-01 | 2021-02-09 | 中广核工程有限公司 | Test method for emergency diesel generator set of nuclear power plant |
| CN112345938B (en) * | 2020-12-01 | 2022-05-31 | 中广核工程有限公司 | Test method for emergency diesel generator set of nuclear power plant |
| CN113964784A (en) * | 2021-10-28 | 2022-01-21 | 西安热工研究院有限公司 | System and method for single-phase one-time through-current correction of differential protection polarity and configuration of motor |
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