A high voltage plant power supply phase checking system and method based on low voltage plant transformer

Abstract

The invention discloses a high-voltage plant power phase checking system and method based on a low-voltage plant transformer, comprising a plant PC unit of a unit 1, a plant PC unit of a unit 2, a low-voltage plant transformer of a unit 1, a low-voltage plant transformer of a unit 2, a high-voltage plant unit of a unit 1, a high-voltage plant unit of a unit 2, a high-voltage plant standby incoming line break of a unit 2, a high-voltage plant working incoming line break of a unit 2, a booster station unit, a generator-transformer group unit of a unit 1, a high-voltage plant transformer of a unit 1, a high-voltage standby transformer, a generator-transformer group unit of a unit 2 and a high-voltage plant transformer of a unit 2. The system and method can complete the phase checking work of the high-voltage plant power and have the characteristics of strong versatility, high safety and low work intensity.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power testing, and relates to a high-voltage plant power supply phase checking system and method based on a low-voltage plant transformer. Background Art

[0002] In order to ensure the safety and reliability of the power supply of the power plant, the high-voltage power plant bus of the power plant is usually designed with two power supplies, one of which is provided by the high-voltage standby transformer through the high-voltage power plant bus standby incoming line switch, and the other is provided by the high-voltage power plant transformer through the high-voltage power plant bus working incoming line switch. A fast switching device is configured between the two power supplies to achieve mutual switching. Before the first switching of the high-voltage power plant power supply, in order to prevent the phase sequence of the two power supplies from being inconsistent, the two high-voltage power plant power supplies need to be phase checked. The conventional phase checking method pulls out the high-voltage power plant bus working incoming line switch from the switch interval, opens the primary bus baffle, and checks the phase on the primary side through the high-voltage phase checking device. This method has high safety risks and high work intensity because it needs to be measured on the primary side. Therefore, it is of great significance to find a high-voltage power plant power supply phase checking system and method based on low-voltage power plant transformers. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a high-voltage plant power supply phase checking system and method based on a low-voltage plant transformer. The system and method can complete the high-voltage plant power supply phase checking work and have the characteristics of strong versatility, high safety and low work intensity.

[0004] To achieve the above-mentioned purpose, the high-voltage plant power supply phase core system based on the low-voltage plant transformer described in the present invention includes a plant PC unit of unit 1, a plant PC unit of unit 2, a low-voltage plant transformer of unit 1, a low-voltage plant transformer of unit 2, a high-voltage plant unit of unit 1, a high-voltage plant unit of unit 2, a high-voltage plant standby incoming line break of unit 2, a high-voltage plant working incoming line break of unit 2, a booster station unit, a generator-transformer unit of unit 1, a high-voltage plant transformer of unit 1, a high-voltage standby transformer, a generator-transformer unit of unit 2 and a high-voltage plant transformer of unit 2;

[0005] One end of the generator-transformer unit of Unit 1 is connected to the booster station unit, and the other end of the generator-transformer unit of Unit 1 is connected to the high-voltage plant unit of Unit 1 via the high-voltage plant transformer of Unit 1. One end of the generator-transformer unit of Unit 2 is connected to the booster station unit, and the other end of the generator-transformer unit of Unit 2 is connected to the high-voltage plant unit of Unit 2 via the high-voltage plant transformer of Unit 2 and the high-voltage plant working incoming line break of Unit 2. The high-voltage side of the high-voltage standby transformer is connected to the booster station unit, and the low-voltage side of the high-voltage standby transformer is divided into two paths, one of which is connected to the high-voltage plant transformer of Unit 1. The high-pressure side of the low-pressure plant transformer of Unit 1 is connected to the high-pressure plant unit of Unit 1, the low-pressure side of the low-pressure plant transformer of Unit 1 is connected to the plant PC unit of Unit 1, the high-pressure side of the low-pressure plant transformer of Unit 2 is connected to the high-pressure plant unit of Unit 2, the low-pressure side of the low-pressure plant transformer of Unit 2 is connected to the plant PC unit of Unit 2, and the plant PC unit of Unit 1 is connected to the plant PC unit of Unit 2.

[0006] The booster station unit includes the booster station busbar, the No. 1 main transformer high-voltage side switch, the high-voltage standby transformer high-voltage side switch and the No. 2 main transformer high-voltage side switch;

[0007] The busbar of the booster station is connected to the generator-transformer group unit of unit 1 through the high-voltage side switch of the No. 1 main transformer, and the busbar of the booster station is connected to the high-voltage standby transformer through the high-voltage side switch of the high-voltage standby transformer. The busbar of the booster station is connected to the generator-transformer group unit of unit 2 through the high-voltage side switch of the No. 2 main transformer.

[0008] The generator-transformer unit of Unit 2 includes the generator of Unit 2, the outlet switch of Unit 2 and the main transformer of Unit 2;

[0009] The booster station unit is connected to the high-voltage side of the main transformer of Unit 2. The low-voltage side of the main transformer of Unit 2 is divided into two paths, one is connected to the generator of Unit 2 through the outlet switch of Unit 2, and the other is connected to the high-voltage plant transformer of Unit 2.

[0010] The high-voltage plant unit of Unit 1 includes the high-voltage plant bus working incoming line PT of Unit 1, the high-voltage plant bus working incoming line switch of Unit 1, the high-voltage plant bus standby incoming line PT of Unit 1, the high-voltage plant bus standby incoming line switch of Unit 1, the high-voltage plant bus PT of Unit 1, the high-voltage plant bus feeder switch of Unit 1 and the high-voltage plant bus of Unit 1;

[0011] The high-voltage plant busbar of Unit 1 is connected to the high-voltage plant transformer of Unit 1 through the working incoming line switch of the high-voltage plant busbar of Unit 1 and the working incoming line PT of the high-voltage plant busbar of Unit 1. The high-voltage plant busbar of Unit 1 is connected to the high-voltage standby phase through the standby incoming line switch of the high-voltage plant busbar of Unit 1 and the standby incoming line PT of the high-voltage plant busbar of Unit 1. The high-voltage plant busbar of Unit 1 is connected to the low-voltage plant transformer of Unit 1 through the high-voltage plant busbar feeder switch of Unit 1. The high-voltage plant busbar PT of Unit 1 is connected to the high-voltage plant busbar of Unit 1.

[0012] The high-voltage plant unit of Unit 2 includes the high-voltage plant bus standby incoming line PT of Unit 2, the high-voltage plant bus standby incoming line switch of Unit 2, the high-voltage plant bus working incoming line PT of Unit 2, the high-voltage plant bus working incoming line switch of Unit 2, the high-voltage plant bus PT of Unit 2, the high-voltage plant bus feeder switch of Unit 2 and the high-voltage plant bus of Unit 2;

[0013] The high-voltage plant busbar of Unit 2 is connected to the high-voltage plant standby incoming line break of Unit 2 via the high-voltage plant busbar standby incoming line switch of Unit 2 and the high-voltage plant busbar standby incoming line PT of Unit 2. The high-voltage plant busbar of Unit 2 is connected to the high-voltage plant working incoming line break of Unit 2 via the high-voltage plant busbar working incoming line switch of Unit 2 and the high-voltage plant busbar working incoming line PT of Unit 2. The high-voltage plant busbar of Unit 2 is connected to the low-voltage plant transformer of Unit 2 via the high-voltage plant busbar feeder switch of Unit 2. The high-voltage plant busbar PT of Unit 2 is connected to the high-voltage plant busbar of Unit 2.

[0014] The plant PC unit of Unit 1 includes the plant PC incoming line switch of Unit 1, the plant PC contact switch of Unit 1 and the plant PC busbar of Unit 1;

[0015] The plant PC busbar of Unit 1 is connected to the low-voltage plant phase of Unit 1 through the plant PC incoming switch of Unit 1, and the plant PC busbar of Unit 1 is connected to the plant PC unit of Unit 2 through the plant PC connecting switch of Unit 1.

[0016] The plant PC unit of Unit 2 includes the plant PC incoming line switch of Unit 2 and the plant PC busbar of Unit 2;

[0017] The plant PC busbar of Unit 2 is connected to the low-voltage plant PC of Unit 2 through the plant PC incoming switch of Unit 2, and the plant PC busbar of Unit 2 is connected to the plant PC unit of Unit 1.

[0018] A method for phase checking of a high voltage power supply for a plant based on a low voltage power transformer comprises the following steps:

[0019] 1) Carry out preliminary preparation work for phase checking of high voltage power supply for plant use;

[0020] 2) Close the high-voltage side switch of the high-voltage standby transformer and perform an impact test on the high-voltage standby transformer;

[0021] 3) Check whether the high-voltage standby transformer and the high-voltage plant bus standby incoming line PT of Unit 1 are operating normally. If the high-voltage standby transformer and the high-voltage plant bus standby incoming line PT of Unit 1 are operating normally, go to step 4); otherwise, go to step 5);

[0022] 4) Close the standby incoming line switch of the high-voltage plant busbar of Unit 1, perform an impact test on the high-voltage plant busbar of Unit 1, and then go to step 6);

[0023] 5) Disconnect the high-voltage side switch of the high-voltage standby transformer, check and eliminate the defects, and then go to step 2);

[0024] 6) Check whether the high-voltage plant busbar of unit 1 and the high-voltage plant busbar PT of unit 1 are operating normally. If the high-voltage plant busbar of unit 1 and the high-voltage plant busbar PT of unit 1 are operating normally, go to step 7); otherwise, go to step 8);

[0025] 7) Close the high-voltage plant bus feeder switch of Unit 1, perform an impulse test on the low-voltage plant transformer of Unit 1, and then go to step 9);

[0026] 8) Disconnect the spare incoming line switch of the high-voltage plant busbar of Unit 1, check and eliminate the defects, and then go to step 4);

[0027] 9) Check whether the low-pressure plant transformer of Unit 1 is operating normally. If the low-pressure plant transformer of Unit 1 is operating normally, go to step 10); otherwise, go to step 11);

[0028] 10) Close the PC incoming line switch of Unit 1, perform an impact test on the PC busbar of Unit 1, and then go to step 12);

[0029] 11) Disconnect the high-voltage plant bus feeder switch of Unit 1, check and eliminate the defects, and then go to step 7);

[0030] 12) Check whether the PC busbar for the No. 1 unit is operating normally. If the PC busbar for the No. 1 unit is operating normally, go to step 13); otherwise, go to step 14);

[0031] 13) Close the PC tie switch for unit 1, perform an impact test on the PC busbar for unit 2, and then go to step 15);

[0032] 14) Disconnect the PC inlet switch for Unit 1, check and eliminate the defects, and then go to step 10);

[0033] 15) Check whether the PC busbar for the second unit is operating normally. If the PC busbar for the second unit is operating normally, go to step 16; otherwise, go to step 17;

[0034] 16) Close the PC incoming line switch of Unit 2, perform an impact test on the low-voltage transformer of Unit 2, and then go to step 18);

[0035] 17) Disconnect the PC contact switch for Unit 1, check and eliminate the defects, and then go to step 13);

[0036] 18) Check whether the low-pressure plant transformer of Unit 2 is operating normally. If the low-pressure plant transformer of Unit 2 is operating normally, go to step 19); otherwise, go to step 20);

[0037] 19) Close the high-voltage plant bus feeder switch of Unit 2, perform an impact test on the high-voltage plant bus of Unit 2, and then go to step 21);

[0038] 20) Disconnect the PC inlet switch for Unit 2, check and eliminate the defects, and then go to step 16);

[0039] 21) Check whether the high-voltage plant busbar of unit 2 and the high-voltage plant busbar PT of unit 2 are operating normally. If the high-voltage plant busbar of unit 2 and the high-voltage plant busbar PT of unit 2 are operating normally, go to step 22); otherwise, go to step 23);

[0040] 22) Close the high-voltage plant bus standby incoming line switch of Unit 2, perform an impact test on the high-voltage plant bus standby incoming line PT of Unit 2, and then go to step 24);

[0041] 23) Disconnect the high-voltage plant bus feeder switch of Unit 2, check and eliminate the defects, and then go to step 19);

[0042] 24) Check whether the high-voltage plant bus standby incoming line PT of the second unit is operating normally. When the high-voltage plant bus standby incoming line PT of the second unit is operating normally, go to step 25); otherwise, go to step 26);

[0043] 25) Close the high-voltage plant busbar working incoming line switch of Unit 2, perform an impact test on the high-voltage plant busbar working incoming line PT of Unit 2, and then go to step 27);

[0044] 26) Disconnect the spare incoming line switch of the high-voltage plant busbar of Unit 2, check and eliminate the defects, and then go to step 22);

[0045] 27) Check whether the high-voltage plant busbar working incoming line PT of the second unit is operating normally. When the high-voltage plant busbar working incoming line PT of the second unit is operating normally, go to step 28); otherwise, go to step 29);

[0046] 28) Perform phase test on the high-voltage plant bus PT of unit 2, the standby incoming line PT of the high-voltage plant bus of unit 2 and the working incoming line PT of the high-voltage plant bus of unit 2, and then go to step 30);

[0047] 29) Disconnect the high-voltage plant busbar working incoming line switch of Unit 2, check and eliminate the defects, and then go to step 25);

[0048] 30) Determine whether the result of the phase verification is correct. If the result of the phase verification is correct, go to step 32); otherwise, go to step 31);

[0049] 31) Disconnect the high-voltage plant bus feeder switch of Unit 2, check and eliminate the defects, and then go to step 19);

[0050] 32) The phase test of the high-voltage factory power supply is completed.

[0051] The specific operations of step 1) are:

[0052] Ensure that the high-voltage standby incoming line break for Unit 2 and the high-voltage working incoming line break for Unit 2 are kept at a safe distance;

[0053] Make sure the high-voltage busbar service incoming line switch of Unit 1 is in the open state and in the test position;

[0054] The booster station system, high-voltage standby transformer system, high-voltage plant power supply system and low-voltage plant power supply system have been installed and debugged according to the design requirements and are ready for power transmission.

[0055] The present invention has the following beneficial effects:

[0056] The high-voltage plant power phase checking system and method based on the low-voltage plant transformer described in the present invention, during specific operation, receives power to the plant PC bus of Unit 2 through the plant PC connecting switch between the two units, and at the same time receives power to the high-voltage plant bus of Unit 2, the high-voltage plant bus PT of Unit 2, the high-voltage plant bus working incoming line PT of Unit 2 and the standby incoming line PT of the high-voltage plant bus of Unit 2 through backwashing the low-voltage plant transformer of Unit 2, and uses the low-voltage plant transformer of Unit 2 as the high-voltage plant power supply of Unit 2 to perform a secondary phase checking test between the PTs of the high-voltage plant power supply, without the need to perform a phase checking test again, and at the same time, before Unit 2 is officially powered on, the high-voltage plant power phase checking test of Unit 2 is completed in advance through the low-voltage plant transformer of Unit 2, effectively shortening the time for official power on, with strong safety and reliability, and easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is a system diagram of the present invention;

[0058] Figure 2 It is a flow chart of the present invention.

[0059] Among them, 1 is the booster station unit, 1-1 is the booster station busbar, 1-2 is the high-voltage side switch of the No. 1 main transformer, 1-3 is the high-voltage side switch of the high-voltage standby transformer, 1-4 is the high-voltage side switch of the No. 2 main transformer, 2 is the generator-transformer unit of Unit 1, 2-1 is the main transformer of Unit 1, 2-2 is the export switch of Unit 1, 2-3 is the generator of Unit 1, 3 is the high-voltage standby transformer, 4 is the generator-transformer unit of Unit 2, 4-1 is the main transformer of Unit 2, 4-2 is the export switch of Unit 2, 4-3 is the generator of Unit 2 Motor, 5 is the high-voltage transformer for unit 1, 6 is the high-voltage transformer for unit 2, 7 is the high-voltage standby incoming line break for unit 2, 8 is the high-voltage working incoming line break for unit 2, 9 is the high-voltage unit for unit 1, 9-1 is the high-voltage busbar working incoming line PT for unit 1, 9-2 is the high-voltage busbar working incoming line switch for unit 1, 9-3 is the high-voltage busbar standby incoming line PT for unit 1, 9-4 is the high-voltage busbar standby incoming line switch for unit 1, 9-5 is the high-voltage busbar standby incoming line PT for unit 1 The plant bus PT, 9-6 is the high-voltage plant bus feeder switch of Unit 1, 9-7 is the high-voltage plant bus of Unit 1, 10 is the high-voltage plant unit of Unit 2, 10-1 is the high-voltage plant bus standby incoming line PT of Unit 2, 10-2 is the high-voltage plant bus standby incoming line switch of Unit 2, 10-3 is the high-voltage plant bus working incoming line PT of Unit 2, 10-4 is the high-voltage plant bus working incoming line switch of Unit 2, 10-5 is the high-voltage plant bus PT of Unit 2, 10-6 is the high-voltage plant bus PT of Unit 2 The unit's high-voltage plant bus feeder switch, 10-7 is the high-voltage plant bus of unit 2, 11 is the low-voltage plant transformer of unit 1, 12 is the low-voltage plant transformer of unit 2, 13 is the plant PC unit of unit 1, 13-1 is the plant PC incoming line switch of unit 1, 13-2 is the plant PC connecting switch of unit 1, 13-3 is the plant PC bus of unit 1, 14 is the plant PC unit of unit 2, 14-1 is the plant PC incoming line switch of unit 2, and 14-2 is the plant PC bus of unit 2. DETAILED DESCRIPTION

[0060] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0061] refer to Figure 1The high-voltage power supply phase core system based on the low-voltage power supply transformer of the present invention comprises a power supply PC unit 13 for unit 1, a power supply PC unit 14 for unit 2, a low-voltage power supply transformer 11 for unit 1, a low-voltage power supply transformer 12 for unit 2, a high-voltage power supply unit 9 for unit 1, a high-voltage power supply unit 10 for unit 2, a high-voltage power supply standby incoming line break 7 for unit 2, a high-voltage power supply working incoming line break 8 for unit 2, a booster station unit 1, a power supply generator 1 for unit 1, a power supply transformer 2 for unit 2, a high-voltage power supply transformer 3 for unit 1, a high-voltage power supply transformer 4 for unit 1, a high-voltage power supply transformer 5 for unit 1, a high-voltage power supply transformer 6 for unit 1, a high-voltage power supply transformer 7 for unit 1, a high-voltage power supply transformer 8 for unit 2, a booster station unit 1, a power supply transformer 1 for unit 1, a power supply transformer 1 for unit 1, a high-voltage power supply transformer 11 for unit 1, a high-voltage power supply transformer 12 for unit 1, a high-voltage power supply transformer 13 for unit 1, a high-voltage power supply transformer 14 for unit 1, a high-voltage power supply transformer 15 for unit 1, a high-voltage power supply transformer 16 for unit 1, a high-voltage power supply transformer 17 for unit 1, a high-voltage power supply transformer 18 for unit 1, a high-voltage power supply transformer 19 for unit 1, a high-voltage power supply transformer 10 for unit 1, a high-voltage power supply transformer 11 for unit 1, a high-voltage power supply transformer 12 for unit 1, a high-voltage power supply transformer 13 for unit 1, a high-voltage power supply transformer 14 for unit 1, a high-voltage power supply transformer 15 for unit 1 Transformer unit 2, high-voltage plant transformer 5 for unit 1, high-voltage standby transformer 3, generator-transformer unit 4 for unit 2 and high-voltage plant transformer 6 for unit 2; one end of generator-transformer unit 2 for unit 1 is connected to booster station unit 1, the other end of generator-transformer unit 2 for unit 1 is connected to high-voltage plant unit 9 for unit 1 via high-voltage plant transformer 5 for unit 1, one end of generator-transformer unit 4 for unit 2 is connected to booster station unit 1, and the other end of generator-transformer unit 4 for unit 2 is connected to high-voltage plant unit 9 for unit 1 via high-voltage plant transformer 5 for unit 1. The other end is connected to the high-voltage plant unit 10 of Unit 2 via the high-voltage plant transformer 6 of Unit 2 and the high-voltage plant working incoming line break 8 of Unit 2. The high-voltage side of the high-voltage standby transformer 3 is connected to the booster station unit 1. The low-voltage side of the high-voltage standby transformer 3 is divided into two paths, one of which is connected to the high-voltage plant unit 9 of Unit 1, and the other is connected to the high-voltage plant unit 10 of Unit 2 via the high-voltage plant standby incoming line break 7 of Unit 2. The low-voltage plant transformer of Unit 1 is connected to the high-voltage plant unit 9 of Unit 1. The high-pressure side of 11 is connected to the high-pressure plant unit 9 of unit 1, the low-pressure side of the low-pressure plant transformer 11 of unit 1 is connected to the plant PC unit 13 of unit 1, the high-pressure side of the low-pressure plant transformer 12 of unit 2 is connected to the high-pressure plant unit 10 of unit 2, the low-pressure side of the low-pressure plant transformer 12 of unit 2 is connected to the plant PC unit 14 of unit 2, and the plant PC unit 13 of unit 1 is connected to the plant PC unit 14 of unit 2.

[0062] The booster station unit 1 includes a booster station bus 1-1, a No. 1 main transformer high-voltage side switch 1-2, a high-voltage standby transformer high-voltage side switch 1-3 and a No. 2 main transformer high-voltage side switch 1-4; the booster station bus 1-1 is connected to the No. 1 generator-transformer group unit 2 via the No. 1 main transformer high-voltage side switch 1-2, the booster station bus 1-1 is connected to the high-voltage standby transformer 3 via the high-voltage standby transformer high-voltage side switch 1-3, and the booster station bus 1-1 is connected to the No. 2 generator-transformer group unit 4 via the No. 2 main transformer high-voltage side switch 1-4.

[0063] The generator-transformer unit 4 of unit 2 includes the generator 4-3 of unit 2, the export switch 4-2 of unit 2 and the main transformer 4-1 of unit 2; the booster station unit 1 is connected to the high-voltage side of the main transformer 4-1 of unit 2, and the low-voltage side of the main transformer 4-1 of unit 2 is divided into two paths, one of which is connected to the generator 4-3 of unit 2 through the export switch 4-2 of unit 2, and the other is connected to the high-voltage plant transformer 6 of unit 2.

[0064] The high-voltage plant unit 9 of unit 1 includes the high-voltage plant bus working incoming line PT9-1 of unit 1, the high-voltage plant bus working incoming line switch 9-2 of unit 1, the high-voltage plant bus standby incoming line PT9-3 of unit 1, the high-voltage plant bus standby incoming line switch 9-4 of unit 1, the high-voltage plant bus PT9-5 of unit 1, the high-voltage plant bus feeder switch 9-6 of unit 1 and the high-voltage plant bus 9-7 of unit 1; the high-voltage plant bus 9-7 of unit 1 is connected to the high-voltage plant bus working incoming line switch 9-2 of unit 1 and the high-voltage plant bus 9-8 of unit 1. The high-voltage plant bus working incoming line PT9-1 of unit 1 is connected to the high-voltage plant transformer 5 of unit 1, the high-voltage plant bus 9-7 of unit 1 is connected to the high-voltage standby transformer 3 via the high-voltage plant bus standby incoming line switch 9-4 of unit 1 and the high-voltage plant bus standby incoming line PT9-3 of unit 1, the high-voltage plant bus 9-7 of unit 1 is connected to the low-voltage plant transformer 11 of unit 1 via the high-voltage plant bus feeder switch 9-6 of unit 1, and the high-voltage plant bus PT9-5 of unit 1 is connected to the high-voltage plant bus 9-7 of unit 1.

[0065] The high-voltage plant unit 10 of the second unit includes the high-voltage plant bus standby incoming line PT10-1 of the second unit, the high-voltage plant bus standby incoming line switch 10-2 of the second unit, the high-voltage plant bus working incoming line PT10-3 of the second unit, the high-voltage plant bus working incoming line switch 10-4 of the second unit, the high-voltage plant bus PT10-5 of the second unit, the high-voltage plant bus feeder switch 10-6 of the second unit and the high-voltage plant bus 10-7 of the second unit; the high-voltage plant bus 10-7 of the second unit is connected to the high-voltage plant bus standby incoming line switch 10-2 of the second unit and the high-voltage plant bus of the second unit. The busbar spare incoming line PT10-1 is connected to the high-voltage plant spare incoming line break 7 of Unit 2, the high-voltage plant busbar 10-7 of Unit 2 is connected to the high-voltage plant working incoming line break 8 of Unit 2 via the high-voltage plant busbar working incoming line switch 10-4 of Unit 2 and the high-voltage plant busbar working incoming line PT10-3 of Unit 2, the high-voltage plant busbar 10-7 of Unit 2 is connected to the low-voltage plant transformer 12 of Unit 2 via the high-voltage plant busbar feeder switch 10-6 of Unit 2, and the high-voltage plant busbar PT10-5 of Unit 2 is connected to the high-voltage plant busbar 10-7 of Unit 2.

[0066] The plant PC unit 13 of unit 1 includes a plant PC incoming line switch 13-1 for unit 1, a plant PC connecting switch 13-2 for unit 1 and a plant PC busbar 13-3 for unit 1; the plant PC busbar 13-3 for unit 1 is connected to the low-voltage plant transformer 11 of unit 1 via the plant PC incoming line switch 13-1 for unit 1, and the plant PC busbar 13-3 for unit 1 is connected to the plant PC unit 14 of unit 2 via the plant PC connecting switch 13-2 for unit 1.

[0067] The plant PC unit 14 of unit 2 includes a plant PC incoming line switch 14-1 and a plant PC bus 14-2 of unit 2; the plant PC bus 14-2 of unit 2 is connected to the low-voltage plant transformer 12 of unit 2 via the plant PC incoming line switch 14-1 of unit 2, and the plant PC bus 14-2 of unit 2 is connected to the plant PC unit 13 of unit 1.

[0068] refer to Figure 2 The high voltage power supply phase checking method based on the low voltage power supply transformer of the present invention comprises the following steps:

[0069] 1) Carry out preliminary preparation work for phase checking of high voltage power supply for plant use;

[0070] 2) Close the high-voltage side switch 1-3 of the high-voltage standby transformer and perform an impact test on the high-voltage standby transformer 3;

[0071] 3) Check whether the high-voltage standby transformer 3 and the high-voltage plant bus standby incoming line PT9-3 of the No. 1 unit are operating normally. If the high-voltage standby transformer 3 and the high-voltage plant bus standby incoming line PT9-3 of the No. 1 unit are operating normally, go to step 4); otherwise, go to step 5);

[0072] 4) Close the standby incoming line switch 9-4 of the high-voltage plant busbar of Unit 1, perform an impact test on the high-voltage plant busbar 9-7 of Unit 1, and then go to step 6);

[0073] 5) Disconnect the high-voltage standby transformer high-voltage side switch 1-3, check and eliminate the defects, and then go to step 2);

[0074] 6) Check whether the high-voltage plant bus 9-7 of unit 1 and the high-voltage plant bus PT9-5 of unit 1 are operating normally. If the high-voltage plant bus 9-7 of unit 1 and the high-voltage plant bus PT9-5 of unit 1 are operating normally, go to step 7); otherwise, go to step 8);

[0075] 7) Close the high-voltage plant bus feeder switch 9-6 of Unit 1, perform an impact test on the low-voltage plant transformer 11 of Unit 1, and then go to step 9);

[0076] 8) Disconnect the high-voltage plant busbar standby incoming line switch 9-4 of Unit 1, check and eliminate the defects, and then go to step 4);

[0077] 9) Check whether the low-pressure plant transformer 11 of the No. 1 unit is operating normally. When the low-pressure plant transformer 11 of the No. 1 unit is operating normally, go to step 10); otherwise, go to step 11);

[0078] 10) Close the PC incoming line switch 13-1 of unit 1, perform an impact test on the PC bus 13-3 of unit 1, and then go to step 12);

[0079] 11) Disconnect the high-voltage plant bus feeder switch 9-6 of Unit 1, check and eliminate the defects, and then go to step 7);

[0080] 12) Check whether the PC bus 13-3 for the No. 1 unit is operating normally. If the PC bus 13-3 for the No. 1 unit is operating normally, go to step 13); otherwise, go to step 14);

[0081] 13) Close the PC contact switch 13-2 for the plant of unit 1, perform an impact test on the PC bus 14-2 for the plant of unit 2, and then go to step 15);

[0082] 14) Disconnect the PC inlet switch 13-1 for unit 1, check and eliminate the defects, and then go to step 10);

[0083] 15) Check whether the PC bus 14-2 for the second unit is operating normally. If the PC bus 14-2 for the second unit is operating normally, go to step 16); otherwise, go to step 17);

[0084] 16) Close the PC incoming line switch 14-1 for the No. 2 unit, perform an impact test on the low-voltage plant transformer 12 for the No. 2 unit, and then go to step 18);

[0085] 17) Disconnect the PC contact switch 13-2 for unit 1, check and eliminate the defects, and then go to step 13);

[0086] 18) Check whether the low-pressure plant transformer 12 of the second unit is operating normally. If the low-pressure plant transformer 12 of the second unit is operating normally, go to step 19); otherwise, go to step 20);

[0087] 19) Close the high-voltage plant bus feeder switch 10-6 of the second unit, perform an impact test on the high-voltage plant bus 10-7 of the second unit, and then go to step 21);

[0088] 20) Disconnect the PC inlet switch 14-1 for Unit 2, check and eliminate the defects, and then go to step 16);

[0089] 21) Check whether the high-voltage plant bus 10-7 of the second unit and the high-voltage plant bus PT10-5 of the second unit are operating normally. When the high-voltage plant bus 10-7 of the second unit and the high-voltage plant bus PT10-5 of the second unit are operating normally, go to step 22); otherwise, go to step 23);

[0090] 22) Close the high-voltage plant bus standby incoming line switch 10-2 of the second unit, perform an impact test on the high-voltage plant bus standby incoming line PT10-1 of the second unit, and then go to step 24);

[0091] 23) Disconnect the high-voltage plant bus feeder switch of Unit 2 (10-6), check and eliminate the defects, and then go to step 19);

[0092] 24) Check whether the high-voltage plant bus spare incoming line PT10-1 of the second unit is operating normally. When the high-voltage plant bus spare incoming line PT10-1 of the second unit is operating normally, go to step 25); otherwise, go to step 26);

[0093] 25) Close the high-voltage plant busbar working incoming line switch 10-4 of the second unit, perform an impact test on the high-voltage plant busbar working incoming line PT10-3 of the second unit, and then go to step 27);

[0094] 26) Disconnect the spare incoming line switch 10-2 of the high-voltage plant busbar of Unit 2, check and eliminate the defects, and then go to step 22);

[0095] 27) Check whether the high-voltage plant busbar working incoming line PT10-3 of the second unit is operating normally. When the high-voltage plant busbar working incoming line PT10-3 of the second unit is operating normally, go to step 28); otherwise, go to step 29);

[0096] 28) Perform phase test on the high-voltage plant bus PT10-5 of unit 2, the standby incoming line PT10-2 of the high-voltage plant bus of unit 2, and the working incoming line PT10-3 of the high-voltage plant bus of unit 2, and then go to step 30);

[0097] 29) Disconnect the high-voltage plant busbar working incoming line switch 10-4 of Unit 2, check and eliminate the defects, and then go to step 25);

[0098] 30) Determine whether the phase verification result is correct. If the phase verification result is correct, go to step 32), otherwise, go to step 31);

[0099] 31) Disconnect the high-voltage plant bus feeder switch 10-6 of Unit 2, check and eliminate the defects, and then go to step 19);

[0100] 32) The phase test of the high-voltage factory power supply is completed.

[0101] The specific operations of step 1) are:

[0102] Ensure that the high-voltage standby incoming line break 7 of Unit 2 and the high-voltage working incoming line break 8 of Unit 2 are kept at a safe distance;

[0103] Make the high-voltage plant busbar working incoming line switch 9-2 of Unit 1 in the open state and in the test position;

[0104] The booster station system, high-voltage standby transformer system, high-voltage plant power supply system and low-voltage plant power supply system have been installed and debugged according to the design requirements and are ready for power transmission.

[0105] Whether the high-voltage plant bus standby incoming line PT9-3 of unit 1 is operating normally in step 3), whether the high-voltage plant bus PT9-5 of unit 1 is operating normally in step 6), whether the high-voltage plant bus PT10-5 of unit 2 is operating normally in step 21), whether the high-voltage plant bus standby incoming line PT10-1 of unit 2 is operating normally in step 24), and whether the high-voltage plant bus working incoming line PT10-3 of unit 2 is operating normally in step 27) are all judged by measuring whether the secondary voltage amplitude of each PT is equal to the primary voltage value divided by the PT transformation ratio, and whether the PT secondary voltage phase sequence is a positive phase sequence. When the PT secondary voltage amplitude is equal to the primary voltage value divided by the PT transformation ratio, and the PT secondary voltage is a positive phase sequence, it is considered that the PT is operating normally, otherwise, it is considered that the PT is operating abnormally;

[0106] Whether the medium and high voltage standby transformer 3 is operating normally in step 3), whether the low voltage plant transformer 11 of unit 1 is operating normally in step 9), and whether the low voltage plant transformer 12 of unit 2 is operating normally in step 18) are all judged by observing the operating sound of the transformer and whether the transformer has protection action and alarm signal. When the transformer is running with a gentle humming sound and no protection action and alarm signal, it is considered that the transformer is operating normally, otherwise, it is considered that the transformer is operating abnormally;

[0107] Whether the plant PC bus 13-3 of unit 1 in step 12) is operating normally and whether the plant PC bus 14-2 of unit 2 is operating normally in step 15) are both determined by measuring the plant PC bus voltage. When the plant PC bus voltage amplitude is the transformer high-voltage side voltage amplitude divided by the transformer ratio and the plant PC bus voltage phase sequence is a positive phase sequence, it is considered that the plant PC bus is operating normally, otherwise, it is considered that the plant PC bus is operating abnormally.

[0108] Whether the phase checking result in step 30) is correct is judged by measuring the secondary voltage amplitude and phase sequence between the high-voltage plant bus PT10-5 of unit 2, the spare incoming line PT10-2 of unit 2, and the working incoming line PT10-3 of unit 2. When the measurement results of the in-phase voltage amplitude between the PTs are all 0 and the out-of-phase voltage amplitude measurement results are all line voltages, the phase checking result is considered correct; otherwise, the phase checking result is considered incorrect.

[0109] Before the high-voltage plant busbar is officially powered, the present invention can complete the phase check of the high-voltage plant power supply with the help of a low-voltage plant transformer, and timely discover existing problems. It has high safety and reliability, and is easy to promote and use on site.

Claims

1. A high voltage plant power supply core phase system based on a low voltage plant transformer, characterized in that: It includes the plant PC unit (13) of unit 1, the plant PC unit (14) of unit 2, the low-voltage plant transformer (11) of unit 1, the low-voltage plant transformer (12) of unit 2, the high-voltage plant unit (9) of unit 1, the high-voltage plant unit (10) of unit 2, the high-voltage plant standby incoming line break of unit 2 (7), the high-voltage plant working incoming line break of unit 2 (8), the booster station unit (1), the generator-transformer unit (2) of unit 1, the high-voltage plant transformer (5) of unit 1, the high-voltage standby transformer (3), the generator-transformer unit (4) of unit 2 and the high-voltage plant transformer (6) of unit 2; One end of the generator-transformer group unit (2) of the first generating unit is connected to the booster station unit (1), and the other end of the generator-transformer group unit (2) of the first generating unit is connected to the high-voltage plant unit (9) of the first generating unit via the high-voltage plant transformer (5) of the first generating unit. One end of the generator-transformer group unit (4) of the second generating unit is connected to the booster station unit (1), and the other end of the generator-transformer group unit (4) of the second generating unit is connected to the high-voltage plant unit (10) of the second generating unit via the high-voltage plant transformer (6) of the second generating unit and the high-voltage plant working line break (8) of the second generating unit. The high-voltage side of the high-voltage standby transformer (3) is connected to the booster station unit (1), and the low-voltage side of the high-voltage standby transformer (3) is divided into two paths, one of which is connected to the high-voltage plant unit (10) of the first generating unit. The first line is connected to the second generator unit (9), the other line is connected to the second generator unit high-voltage plant service unit (10) through the second generator unit high-voltage plant service standby incoming line break (7), the high-voltage side of the first generator unit low-voltage plant service transformer (11) is connected to the first generator unit high-voltage plant service unit (9), the low-voltage side of the first generator unit low-voltage plant service transformer (11) is connected to the first generator unit plant service PC unit (13), the high-voltage side of the second generator unit low-voltage plant service transformer (12) is connected to the second generator unit high-voltage plant service unit (10), the low-voltage side of the second generator unit low-voltage plant service transformer (12) is connected to the second generator unit plant service PC unit (14), and the first generator unit plant service PC unit (13) is connected to the second generator unit plant service PC unit (14); The booster station unit (1) comprises a booster station busbar (1-1), a No. 1 main transformer high-voltage side switch (1-2), a high-voltage standby transformer high-voltage side switch (1-3) and a No. 2 main transformer high-voltage side switch (1-4); The booster station busbar (1-1) is connected to the generator-transformer group unit (2) of the first generator unit via the high-voltage side switch (1-2) of the first main transformer, the booster station busbar (1-1) is connected to the high-voltage standby transformer (3) via the high-voltage side switch (1-3) of the high-voltage standby transformer, and the booster station busbar (1-1) is connected to the generator-transformer group unit (4) of the second generator unit via the high-voltage side switch (1-4) of the second main transformer; The generator-transformer unit (4) of the second unit includes a generator (4-3) of the second unit, an outlet switch (4-2) of the second unit and a main transformer (4-1) of the second unit; The booster station unit (1) is connected to the high-voltage side of the main transformer (4-1) of the second unit. The low-voltage side of the main transformer (4-1) of the second unit is divided into two paths, one of which is connected to the generator (4-3) of the second unit via the outlet switch (4-2) of the second unit, and the other is connected to the high-voltage plant transformer (6) of the second unit. The high-voltage plant unit (9) of the unit 1 includes a high-voltage plant bus working incoming line PT (9-1) of the unit 1, a high-voltage plant bus working incoming line switch (9-2) of the unit 1, a high-voltage plant bus standby incoming line PT (9-3) of the unit 1, a high-voltage plant bus standby incoming line switch (9-4) of the unit 1, a high-voltage plant bus PT (9-5) of the unit 1, a high-voltage plant bus feeder switch (9-6) of the unit 1, and a high-voltage plant bus (9-7) of the unit 1; The high-voltage plant busbar (9-7) of the unit 1 is connected to the high-voltage plant transformer (5) of the unit 1 via the high-voltage plant busbar working incoming line switch (9-2) of the unit 1 and the high-voltage plant busbar working incoming line PT (9-1) of the unit 1. The high-voltage plant busbar (9-7) of the unit 1 is connected to the high-voltage standby transformer (3) via the high-voltage plant busbar standby incoming line switch (9-4) of the unit 1 and the high-voltage plant busbar standby incoming line PT (9-3) of the unit 1. The high-voltage plant busbar (9-7) of the unit 1 is connected to the low-voltage plant transformer (11) of the unit 1 via the high-voltage plant busbar feeder switch (9-6) of the unit 1. The high-voltage plant busbar PT (9-5) of the unit 1 is connected to the high-voltage plant busbar (9-7) of the unit 1. The high-voltage service unit (10) of the second generating unit includes a high-voltage service bus standby incoming line PT (10-1) of the second generating unit, a high-voltage service bus standby incoming line switch (10-2) of the second generating unit, a high-voltage service bus working incoming line PT (10-3) of the second generating unit, a high-voltage service bus working incoming line switch (10-4) of the second generating unit, a high-voltage service bus PT (10-5) of the second generating unit, a high-voltage service bus feeder switch (10-6) of the second generating unit, and a high-voltage service bus (10-7) of the second generating unit; The high-voltage plant busbar (10-7) of the second generating unit is connected to the high-voltage plant standby incoming line break (7) of the second generating unit via the high-voltage plant busbar standby incoming line switch (10-2) of the second generating unit and the high-voltage plant busbar standby incoming line PT (10-1) of the second generating unit; the high-voltage plant busbar (10-7) of the second generating unit is connected to the high-voltage plant working incoming line break (8) of the second generating unit via the high-voltage plant busbar working incoming line switch (10-4) of the second generating unit and the high-voltage plant busbar working incoming line PT (10-3) of the second generating unit; the high-voltage plant busbar (10-7) of the second generating unit is connected to the low-voltage plant transformer (12) of the second generating unit via the high-voltage plant busbar feeder switch (10-6) of the second generating unit; the high-voltage plant busbar PT (10-5) of the second generating unit is connected to the high-voltage plant busbar (10-7) of the second generating unit; The plant PC unit (13) of the unit 1 includes a plant PC incoming line switch (13-1) of the unit 1, a plant PC contact switch (13-2) of the unit 1, and a plant PC busbar (13-3) of the unit 1; The PC busbar (13-3) of the unit 1 is connected to the low-voltage plant transformer (11) of the unit 1 via the PC incoming line switch (13-1) of the unit 1, and the PC busbar (13-3) of the unit 1 is connected to the PC unit (14) of the unit 2 via the PC contact switch (13-2) of the unit 1; The plant PC unit (14) of the second unit includes a plant PC incoming line switch (14-1) of the second unit and a plant PC busbar (14-2) of the second unit; The No. 2 unit plant PC busbar (14-2) is connected to the No. 2 unit low-voltage plant transformer (12) via the No. 2 unit plant PC incoming line switch (14-1), and the No. 2 unit plant PC busbar (14-2) is connected to the No. 1 unit plant PC unit (13).

2. A method for phase checking of high voltage power supply based on low voltage power supply transformer, characterized in that: The high-voltage plant power supply core phase system based on the low-voltage plant transformer according to any one of claim 1 comprises the following steps: 1) Carry out preliminary preparation work for phase checking of high voltage power supply for plant use; 2) Close the high-voltage side switch (1-3) of the high-voltage standby transformer and perform an impact test on the high-voltage standby transformer (3); 3) Check whether the high-voltage standby transformer (3) and the high-voltage plant bus standby incoming line PT (9-3) of the No. 1 generating unit are operating normally. If the high-voltage standby transformer (3) and the high-voltage plant bus standby incoming line PT (9-3) of the No. 1 generating unit are operating normally, go to step 4); otherwise, go to step 5); 4) Close the standby incoming line switch (9-4) of the high-voltage plant busbar of Unit 1, perform an impact test on the high-voltage plant busbar (9-7) of Unit 1, and then go to step 6); 5) Disconnect the high voltage side switch of the high voltage standby transformer (1-3), check and eliminate the defects, and then go to step 2); 6) Check whether the high-voltage plant busbar (9-7) of unit 1 and the high-voltage plant busbar PT (9-5) of unit 1 are operating normally. If the high-voltage plant busbar (9-7) of unit 1 and the high-voltage plant busbar PT (9-5) of unit 1 are operating normally, go to step 7); otherwise, go to step 8); 7) Close the high-voltage plant bus feeder switch (9-6) of unit 1, perform an impact test on the low-voltage plant transformer (11) of unit 1, and then go to step 9); 8) Disconnect the spare incoming line switch of the high-voltage plant busbar of Unit 1 (9-4), check and eliminate the defects, and then go to step 4); 9) Check whether the low-pressure plant transformer (11) of the No. 1 unit is operating normally. If the low-pressure plant transformer (11) of the No. 1 unit is operating normally, go to step 10); otherwise, go to step 11); 10) Close the PC incoming line switch (13-1) of unit 1, perform an impact test on the PC busbar (13-3) of unit 1, and then go to step 12); 11) Disconnect the high-voltage plant bus feeder switch of Unit 1 (9-6), check and eliminate the defects, and then go to step 7); 12) Check whether the PC bus (13-3) for the No. 1 unit is operating normally. If the PC bus (13-3) for the No. 1 unit is operating normally, go to step 13); otherwise, go to step 14); 13) Close the PC contact switch (13-2) for the plant service of unit 1, perform an impact test on the PC busbar (14-2) for the plant service of unit 2, and then go to step 15); 14) Disconnect the PC inlet switch (13-1) of Unit 1, check and eliminate the defects, and then go to step 10); 15) Check whether the PC bus (14-2) for the second unit is operating normally. If the PC bus (14-2) for the second unit is operating normally, go to step 16); otherwise, go to step 17); 16) Close the PC incoming line switch (14-1) of Unit 2, perform an impact test on the low-voltage plant transformer (12) of Unit 2, and then go to step 18); 17) Disconnect the PC contact switch (13-2) of Unit 1, check and eliminate the defects, and then go to step 13); 18) Check whether the low-pressure plant transformer (12) of the second unit is operating normally. If the low-pressure plant transformer (12) of the second unit is operating normally, go to step 19); otherwise, go to step 20); 19) Close the high-voltage plant bus feeder switch (10-6) of the second unit, perform an impact test on the high-voltage plant bus (10-7) of the second unit, and then go to step 21); 20) Disconnect the PC inlet switch (14-1) of Unit 2, check and eliminate the defects, and then go to step 16); 21) Check whether the high-voltage plant busbar (10-7) of unit 2 and the high-voltage plant busbar PT (10-5) of unit 2 are operating normally. If the high-voltage plant busbar (10-7) of unit 2 and the high-voltage plant busbar PT (10-5) of unit 2 are operating normally, go to step 22); otherwise, go to step 23); 22) Close the high-voltage plant bus standby incoming line switch (10-2) of the second unit, perform an impact test on the high-voltage plant bus standby incoming line PT (10-1) of the second unit, and then go to step 24); 23) Disconnect the high-voltage plant bus feeder switch of Unit 2 (10-6), check and eliminate the defects, and then go to step 19); 24) Check whether the high-voltage plant bus standby incoming line PT (10-1) of the second unit is operating normally. If the high-voltage plant bus standby incoming line PT (10-1) of the second unit is operating normally, go to step 25); otherwise, go to step 26); 25) Close the high-voltage plant busbar working incoming line switch (10-4) of the second unit, perform an impact test on the high-voltage plant busbar working incoming line PT (10-3) of the second unit, and then go to step 27); 26) Disconnect the spare incoming line switch (10-2) of the high-voltage plant busbar of Unit 2, check and eliminate the defects, and then go to step 22); 27) Check whether the high-voltage plant busbar working incoming line PT (10-3) of the second unit is operating normally. When the high-voltage plant busbar working incoming line PT (10-3) of the second unit is operating normally, go to step 28); otherwise, go to step 29); 28) Perform phase test on the high-voltage plant bus PT (10-5) of unit 2, the standby incoming line PT (10-2) of the high-voltage plant bus of unit 2, and the working incoming line PT (10-3) of the high-voltage plant bus of unit 2, and then go to step 30); 29) Disconnect the high-voltage plant busbar working incoming line switch of Unit 2 (10-4), check and eliminate the defects, and then go to step 25); 30) Determine whether the result of the phase verification is correct. If the result of the phase verification is correct, go to step 32); otherwise, go to step 31); 31) Disconnect the high-voltage plant bus feeder switch of Unit 2 (10-6), check and eliminate the defects, and then go to step 19); 32) The phase test of the high-voltage factory power supply is completed.

3. The high voltage plant power phase checking method based on low voltage plant transformer according to claim 2 is characterized in that: The specific operations of step 1) are: Ensure that the high-voltage auxiliary power supply line break (7) of Unit 2 and the high-voltage working power supply line break (8) of Unit 2 are kept at a safe distance; Make the high-voltage plant busbar working incoming line switch (9-2) of unit 1 in the open state and in the test position; The booster station system, high-voltage standby transformer system, high-voltage plant power supply system and low-voltage plant power supply system have been installed and debugged according to the design requirements and are ready for power transmission.

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