CN114137328B - Synchronous phasing method based on three-half wiring system - Google Patents
Synchronous phasing method based on three-half wiring system Download PDFInfo
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- CN114137328B CN114137328B CN202111429706.6A CN202111429706A CN114137328B CN 114137328 B CN114137328 B CN 114137328B CN 202111429706 A CN202111429706 A CN 202111429706A CN 114137328 B CN114137328 B CN 114137328B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003822 epoxy resin Substances 0.000 claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a synchronous phasing method based on a three-half wiring system, which comprises the steps of firstly removing soft connection of a high-voltage side of a No. 1 main transformer and a high-voltage side of a No. 2 main transformer connected with a booster station, additionally installing an epoxy resin plate to reliably isolate a transformer from the booster station, and then simultaneously charging a primary transformer I primary transformer PT, a secondary transformer II primary transformer PT, the high-voltage side of the No. 1 main transformer PT and the high-voltage side of the No. 2 main transformer PT of a power plant through a transformer substation breaker in the power receiving period of the booster station, so that different parallel points are selected through a synchronous device of a No. 1 unit and a synchronous device of a No. 2 unit respectively to carry out synchronous phasing of the side breaker and a middle breaker, and the synchronous phasing of four times can be respectively completed by changing a primary operation mode. The invention can avoid the operation of the empty bus for multiple times when the conventional three-half wiring system is phased in the same period in the whole set of starting process, shortens the test time and improves the safe reliability of the power grid operation in the process of the empty bus.
Description
Technical Field
The invention belongs to the technical field of a whole set of starting test of a power plant and a power receiving test of a booster station, and particularly relates to a synchronous phasing method based on a three-half wiring system.
Background
Synchronous grid connection of generators is a necessary condition for safe and reliable operation of a power plant, and synchronous phasing is an important ring for ensuring synchronous grid connection of the generators, so that synchronous phasing test is needed before the first grid connection of a unit. The voltage transformer to be combined and the system side voltage transformer are required to be in a homologous state during synchronous phasing, so that whether the voltage difference, the phase difference and the frequency difference between the voltage on the combined side and the voltage on the system side are zero is judged, and therefore the synchronous phasing test is also called a homologous phasing test.
For a booster station system with two strings of three-half wiring forms, each unit is provided with two grid-connected points of an edge switch or a middle switch and the system side voltages corresponding to different grid-connected points are different, so that two grid-connected points of each unit need to be subjected to a synchronous phasing test before grid connection and ring combination, and four synchronous phasing tests are needed to be respectively carried out on the two units. The booster station is electrified before the synchronous phasing test of the unit to form dispatching and pipe adjusting equipment, so that the homology condition of the voltage transformer to be combined and the system side voltage transformer is difficult to be met, and a primary bus or two primary buses are always required to be respectively vacated according to grid connection points by dispatching. The operation mode firstly weakens the safety and reliability of the power grid during the empty bus, secondly has complicated operation and long operation time, and the synchronous phasing test before the first grid connection of the unit is only a small part of the whole set of starting test, so the whole set of starting time is greatly prolonged, the energy of testers is consumed, and the safety and controllability of the test are reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a synchronous phasing method based on a three-half wiring system, which is carried out during the power receiving period of a booster station, reduces the synchronous phasing test steps, shortens the test time and avoids the influence on the safety and reliability of a power grid during an empty bus.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a synchronous phasing method based on three-half wiring system comprises the following steps;
1. the transformer substation performs loop closing operation before the booster station of the power plant receives electricity, and the power plant applies for 5032 and 5033 for switching cold for standby to the circuit breakers;
2. checking that all circuit breakers, isolation disconnecting links and grounding disconnecting links of a power plant are split before synchronous phasing;
3. dismantling a soft connection point 1 of a high-voltage side of the No. 1 main transformer and the booster station, adding an epoxy resin plate, reliably isolating the No. 1 main transformer from the booster station, dismantling a soft connection point 2 of the high-voltage side of the No. 2 main transformer and the booster station, and adding an epoxy resin plate, and reliably isolating the No. 2 main transformer from the booster station;
4. setting a protection fixed value of a booster station of the power plant according to a scheduled issuing fixed value by power plant operators;
5. substation operators set the protection fixed value of the substation according to the dispatching issued fixed value;
6. the transformer substation operator closes 50216, 50136 and 50236 isolation disconnecting link;
7. the operator of the transformer substation closes 50336 the isolating disconnecting link;
8. the power plant operators turn the circuit breakers 5021, 5022, 5023 and 5013 into heat for standby;
9. converting the 5033 circuit breaker into heat for standby by transformer substation operators;
10. the power plant operators combine 5021, 5022, 5023, 5013 circuit breakers;
11. the transformer substation operator closes a 5033 breaker, charges a power plant booster station through a circuit 1, and runs the power plant I master PT, the power plant II master PT, the power plant 1 main transformer high-voltage side PT and the power plant 2 main transformer high-voltage side PT in an electrified mode;
12. the synchronous device of the main transformer 1 is electrified, a circuit breaker 5021 is selected as a synchronous closing circuit breaker, synchronous phasing is carried out on the main PT voltage of the system side voltage I of the parallel point 5021 and the main transformer high-voltage side PT voltage of the to-be-combined side voltage 1, at the moment, the differential pressure, the frequency difference and the phase difference are zero, a circuit breaker 5022 is selected as the synchronous closing circuit breaker, synchronous phasing is carried out on the main PT voltage of the system side voltage II of the parallel point 5022 and the main transformer high-voltage side PT voltage of the to-be-combined side voltage 1, and at the moment, the differential pressure, the frequency difference and the phase difference are zero;
13. the synchronous device of the main transformer No. 2 is electrified, a 5013 circuit breaker is selected as a synchronous closing circuit breaker, synchronous phasing is carried out on the system side voltage II master PT voltage and the main transformer high voltage side PT voltage of the to-be-combined side voltage No. 2 of the 5013 parallel point, at the moment, the differential pressure, the frequency difference and the phase difference are zero, the 5012 circuit breaker is selected as the synchronous closing circuit breaker, and the synchronous phasing is carried out on the system side voltage I master PT voltage and the main transformer high voltage side PT voltage of the to-be-combined side voltage No. 2 of the 5012 parallel point, at the moment, the differential pressure, the frequency difference and the phase difference are zero;
14. and reporting the end of the scheduling synchronization phasing test, and recovering the operation modes of the transformer substation and the power plant booster station and the soft connection of the main transformer high-voltage side according to the power receiving rest test requirements of the booster station and the scheduling command.
The three-half wiring system comprises a power plant part and a transformer substation part;
the power plant part comprises 50211, 50212, 50221, 50222, 50231, 50232, 50216, 50236, 50111, 50112, 50121, 50122, 50131, 50132, 50116, 50136 isolation knife switches, 502117, 502127, 502217, 502227, 502317, 502327, 502167, 5021617, 5021627, 502367, 5023617, 501117, 501127, 501217, 501227, 501317, 501327, 501367, 5013617, 5013627, 501167, 5011617, 5117, 5217 ground knife switches, 5021, 5022, 5023, 5011, 5012, 5013 circuit breakers, no. 1 main transformer, outlet 1, no. 2 main transformer, outlet 2, I master PT, II master PT, no. 1 main transformer high voltage side PT, no. 2 main transformer high voltage side PT, I master, II master;
the substation section includes 50411, 50412, 50421, 50422, 50431, 50432, 50311, 50312, 50321, 50322, 50331, 50332, 50336 isolation knife switches, 54117, 504127, 504217, 504227, 504317, 504327, 503117, 503127, 503217, 503227, 503317, 503327, 503367, 5033617, 5417, 5317 ground knife switches, 5041, 5042, 5043, 5031, 5032, 5033 circuit breakers, parent III, parent IV.
The invention has the beneficial effects that:
the soft connection of the high-voltage side of the main transformer and the booster is removed and the epoxy resin partition board is additionally arranged before the booster is powered on, so that the main transformer and the booster are reliably isolated, the main transformer I master PT, the secondary master PT, the No. 1 main transformer high voltage PT and the No. 2 main transformer high voltage PT of the booster are charged simultaneously through the transformer substation circuit breaker, different parallel points are selected through the No. 1 unit synchronous device and the No. 2 unit synchronous device to respectively carry out synchronous phasing of the side circuit breaker and the middle circuit breaker, and four synchronous phasing can be completed once. The invention can avoid the operation of the empty bus for multiple times when the conventional three-half wiring system is phased in the same period in the whole set of starting process, shortens the test time and improves the safe reliability of the power grid operation in the process of the empty bus.
Drawings
FIG. 1 is a schematic diagram of contemporaneous phasing of the three-half wiring system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples;
as shown in fig. 1:
1. the transformer substation is operated in a loop before the booster station of the power plant receives power, and the power plant applies for 5032 and 5033 for the switching of the breaker to be cold for standby.
2. Substation operators divide the circuit breakers into 5032 circuit breakers, divide the circuit breakers into 5033 circuit breakers, and divide the disconnecting switches into 50321, 50322, 50331 and 50332. The booster station states are 50411, 50412, 50421, 50422, 50431, 50432, 50311 and 50312 for isolating the switch on position, and 50321, 50322, 50331, 50332 and 50336 for isolating the switch off position; 54117. 504127, 504217, 504227, 504317, 504327, 503117, 503127, 503217, 503227, 503317, 503327, 503367, 5033617, 5417, 5317 grounding switch split; 5041. 5042, 5043, 5031 circuit breaker close, 5032, 5033 circuit breaker split.
3. The contemporaneous pre-phasing power plant operators check that 50211, 50212, 50221, 50222, 50231, 50232, 50216, 50236, 50111, 50112, 50121, 50122, 50131, 50132, 50116, 50136 isolation knife switch split, 502117, 502127, 502217, 502227, 502317, 502327, 502167, 5021617, 5021627, 502367, 5023617, 501117, 501127, 501217, 501227, 501317, 501327, 501367, 5013617, 5013627, 501167, 5011617, 5117, 5217 ground knife split, 5021, 5022, 5023, 5011, 5012, 5013 circuit breakers split.
4. Dismantling a soft connection point 1 of the high-voltage side of the No. 1 main transformer and the booster station, and additionally installing an epoxy resin plate to ensure that the No. 1 main transformer and the booster station are reliably isolated;
5. and removing the soft connection point 2 of the high-voltage side of the No. 2 main transformer and the booster station, and additionally installing an epoxy resin plate, so that the No. 2 main transformer and the booster station are reliably isolated.
6. And setting the protection fixed value of the booster station of the power plant according to the dispatch issued fixed value by the power plant operator.
7. And the substation operator sets the protection fixed value of the substation according to the dispatching issued fixed value.
8. The transformer substation operators switch 50216, 50136 and 50236 to isolate the disconnecting link.
9. The transformer substation operator closes 50336 the isolation switch.
10. The power plant operators switch 5021, 5022, 5023 and 5013 circuit breakers to hot standby. That is, the power plant operators close 50211, 50212, 50221, 50222, 50231, 50232, 50131, 50132 isolation knife switches.
11. Substation operators switch 5033 the circuit breakers to hot standby. I.e. the substation operators close 50331, 50332 isolation knife switches.
12. The power plant operators incorporate 5021, 5022, 5023, 5013 circuit breakers.
13. The transformer substation operator closes 5033 circuit breaker, charges to the power plant booster station through circuit 1, and power plant I is female PT, II is female PT, no. 1 main transformer high voltage side PT, no. 2 main transformer high voltage side PT live-line operation.
14. And powering on the synchronous device of the No. 1 main transformer, selecting 5021 circuit breaker as a synchronous closing circuit breaker, and synchronously phasing the system side voltage I master PT voltage of the 5021 parallel point and the main transformer high-voltage side PT voltage of the to-be-combined side voltage No. 1 main transformer, wherein the differential pressure, the frequency difference and the phase difference are zero. Selecting 5022 circuit breaker as synchronous closing circuit breaker, and synchronously phasing the system side voltage II master PT voltage of 5022 parallel point and the main transformer high voltage side PT voltage of the to-be-combined side voltage No. 1, wherein the differential pressure, the frequency difference and the phase difference are zero.
15. And electrifying a synchronous device of the No. 2 main transformer, selecting the 5013 circuit breaker as a synchronous closing circuit breaker, and synchronously phasing the system side voltage II master PT voltage and the to-be-combined side voltage No. 2 main transformer high-voltage side PT voltage of the 5013 parallel point, wherein the differential pressure, the frequency difference and the phase difference are zero. And selecting 5012 circuit breaker as synchronous closing circuit breaker, and synchronously phasing the system side voltage I master PT voltage and the to-be-combined side voltage No. 2 main transformer high voltage side PT voltage of 5012 parallel points, wherein the differential pressure, the frequency difference and the phase difference are zero.
16. And reporting the end of the scheduling synchronization phasing test, and recovering the operation mode of the transformer substation and the power plant booster station according to the whole set of starting rest test requirements and scheduling commands.
Claims (1)
1. A method for contemporaneous phasing based on a three-half wiring system, comprising the steps of;
1. the transformer substation performs loop closing operation before the booster station of the power plant receives electricity, and the power plant applies for 5032 and 5033 for switching cold for standby to the circuit breakers;
2. checking that all circuit breakers, isolation disconnecting links and grounding disconnecting links of a power plant are split before synchronous phasing;
3. dismantling a soft connection point 1 of a high-voltage side of the No. 1 main transformer and the booster station, adding an epoxy resin plate, reliably isolating the No. 1 main transformer from the booster station, dismantling a soft connection point 2 of the high-voltage side of the No. 2 main transformer and the booster station, and adding an epoxy resin plate, and reliably isolating the No. 2 main transformer from the booster station;
4. setting a protection fixed value of a booster station of the power plant according to a scheduled issuing fixed value by power plant operators;
5. substation operators set the protection fixed value of the substation according to the dispatching issued fixed value;
6. the transformer substation operator closes 50216, 50136 and 50236 isolation disconnecting link;
7. the operator of the transformer substation closes 50336 the isolating disconnecting link;
8. the power plant operators turn the circuit breakers 5021, 5022, 5023 and 5013 into heat for standby;
9. converting the 5033 circuit breaker into heat for standby by transformer substation operators;
10. the power plant operators combine 5021, 5022, 5023, 5013 circuit breakers;
11. the transformer substation operator closes a 5033 breaker, charges a power plant booster station through a circuit 1, and runs the power plant I master PT, the power plant II master PT, the power plant 1 main transformer high-voltage side PT and the power plant 2 main transformer high-voltage side PT in an electrified mode;
12. the synchronous device of the main transformer 1 is electrified, a circuit breaker 5021 is selected as a synchronous closing circuit breaker, synchronous phasing is carried out on the main PT voltage of the system side voltage I of the parallel point 5021 and the main transformer high-voltage side PT voltage of the to-be-combined side voltage 1, at the moment, the differential pressure, the frequency difference and the phase difference are zero, a circuit breaker 5022 is selected as the synchronous closing circuit breaker, synchronous phasing is carried out on the main PT voltage of the system side voltage II of the parallel point 5022 and the main transformer high-voltage side PT voltage of the to-be-combined side voltage 1, and at the moment, the differential pressure, the frequency difference and the phase difference are zero;
13. the synchronous device of the main transformer No. 2 is electrified, a 5013 circuit breaker is selected as a synchronous closing circuit breaker, synchronous phasing is carried out on the system side voltage II master PT voltage and the main transformer high voltage side PT voltage of the to-be-combined side voltage No. 2 of the 5013 parallel point, at the moment, the differential pressure, the frequency difference and the phase difference are zero, the 5012 circuit breaker is selected as the synchronous closing circuit breaker, and the synchronous phasing is carried out on the system side voltage I master PT voltage and the main transformer high voltage side PT voltage of the to-be-combined side voltage No. 2 of the 5012 parallel point, at the moment, the differential pressure, the frequency difference and the phase difference are zero;
14. reporting the end of scheduling synchronization phasing test, and recovering the operation modes of the transformer substation and the power plant booster station and the soft connection of the main transformer high-voltage side according to the rest test requirements of the booster station under power supply and scheduling commands;
the three-half wiring system comprises a power plant part and a transformer substation part;
the power plant part comprises 50211, 50212, 50221, 50222, 50231, 50232, 50216, 50236, 50111, 50112, 50121, 50122, 50131, 50132, 50116, 50136 isolation knife switches, 502117, 502127, 502217, 502227, 502317, 502327, 502167, 5021617, 5021627, 502367, 5023617, 501117, 501127, 501217, 501227, 501317, 501327, 501367, 5013617, 5013627, 501167, 5011617, 5117, 5217 ground knife switches, 5021, 5022, 5023, 5011, 5012, 5013 circuit breakers, no. 1 main transformer, outlet 1, no. 2 main transformer, outlet 2, I master PT, II master PT, no. 1 main transformer high voltage side PT, no. 2 main transformer high voltage side PT, I master, II master;
the substation section includes 50411, 50412, 50421, 50422, 50431, 50432, 50311, 50312, 50321, 50322, 50331, 50332, 50336 isolation knife switches, 54117, 504127, 504217, 504227, 504317, 504327, 503117, 503127, 503217, 503227, 503317, 503327, 503367, 5033617, 5417, 5317 ground knife switches, 5041, 5042, 5043, 5031, 5032, 5033 circuit breakers, parent III, parent IV.
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| CN202111429706.6A CN114137328B (en) | 2021-11-29 | 2021-11-29 | Synchronous phasing method based on three-half wiring system |
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| CN202111429706.6A CN114137328B (en) | 2021-11-29 | 2021-11-29 | Synchronous phasing method based on three-half wiring system |
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| CN114137328A CN114137328A (en) | 2022-03-04 |
| CN114137328B true CN114137328B (en) | 2023-12-22 |
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| CN117411188B (en) * | 2023-11-30 | 2024-06-11 | 中国长江电力股份有限公司 | Automatic operation method of hydropower station 500kV outgoing line route overhaul transfer operation monitoring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655171A (en) * | 2016-12-26 | 2017-05-10 | 国网江苏省电力公司常州供电公司 | Automatic selection method for phase selection control strategies of intermediate circuit breakers under 3/2 connection mode |
| CN110504712A (en) * | 2019-08-21 | 2019-11-26 | 西安热工研究院有限公司 | A kind of homologous kernel phase system of plant gas π type and method |
| CN111342464A (en) * | 2020-04-21 | 2020-06-26 | 西安热工研究院有限公司 | System and method for checking phases of single-bus system wiring mode unit |
| WO2020243951A1 (en) * | 2019-06-06 | 2020-12-10 | 北京四方继保自动化股份有限公司 | Millisecond rapid reconstruction method and system for power supply network after power network failure |
-
2021
- 2021-11-29 CN CN202111429706.6A patent/CN114137328B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655171A (en) * | 2016-12-26 | 2017-05-10 | 国网江苏省电力公司常州供电公司 | Automatic selection method for phase selection control strategies of intermediate circuit breakers under 3/2 connection mode |
| WO2020243951A1 (en) * | 2019-06-06 | 2020-12-10 | 北京四方继保自动化股份有限公司 | Millisecond rapid reconstruction method and system for power supply network after power network failure |
| CN110504712A (en) * | 2019-08-21 | 2019-11-26 | 西安热工研究院有限公司 | A kind of homologous kernel phase system of plant gas π type and method |
| CN111342464A (en) * | 2020-04-21 | 2020-06-26 | 西安热工研究院有限公司 | System and method for checking phases of single-bus system wiring mode unit |
Non-Patent Citations (3)
| Title |
|---|
| 500 kV变电站启动调试分析;王虎;王诗明;王华;文峰;周栋梁;余笃民;;江西电力(第04期);全文 * |
| 浅谈垃圾发电厂同期***调试;李冬;雷丽莎;;现代企业教育(第06期);全文 * |
| 燃气蒸汽联合循环分布式能源的电气整套启动;罗俊然;牛利涛;刘政委;李春丽;;电工技术(第09期);全文 * |
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