CN111342464A - A system and method for checking the phase of a single bus system wiring mode unit - Google Patents

Abstract

The invention discloses a system and method for unit phase core in a single bus system wiring mode. A high-voltage busbar voltage transformer is installed on a high-voltage busbar unit. The unit is connected to one end of the generator outlet circuit breaker unit, the other side of the generator outlet circuit breaker unit is connected to the closed bus, the generator outlet circuit breaker terminal voltage transformer is installed on the closed bus, and the generator unit is connected to the closed bus. The soft connection between the busbars, the soft connection between the excitation transformer and the closed busbar, the low voltage side of the main transformer unit is provided with a voltage transformer on the low voltage side of the main transformer. High performance and operability.

Description

A system and method for checking the phase of a single bus system wiring mode unit

technical field

The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a system and a method for checking the phase of a unit in a single bus system wiring mode.

Background technique

The wiring feature of the single busbar system wiring method is that there is only one set of busbars, and all power sources and outgoing lines are connected to the busbar through circuit breakers and isolating switches. incoming circuit. "Technical Specifications for Commissioning of Thermal Power Generation Construction Engineering Units" DL-T5294-2013 clearly requires the phasing test of the generator synchronous system during the start-up process of the whole set, the zero-start boost test with the bus, the verification of the TV polarity used for the same period, the generator transformer set and the The system side TV secondary phase check, so as to avoid the asynchronous grid connection of the unit. However, since there is only one busbar in the single busbar system wiring mode, the unit cannot carry out the zero-start boost test with the busbar after the main transformer is reversed and sent to the factory, so the phasing test cannot be performed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a system and method for the nuclear phase of a single-bus system wiring unit, the system and method can realize the nuclear phase of a single-bus system wiring unit, and the safety and High operability.

In order to achieve the above purpose, the single-bus system wiring mode unit core phase system of the present invention includes a high-voltage busbar voltage transformer, a high-voltage busbar unit, a main transformer bay high-voltage side circuit breaker unit, a main transformer unit, and a generator outlet circuit breaker unit. , Factory transformer unit, closed busbar, excitation transformer, generator unit and terminal voltage transformer of some generator outlet circuit breakers;

The high-voltage busbar voltage transformer is installed on the high-voltage busbar unit. The high-voltage busbar unit is connected to the factory transformer unit and one end of the generator outlet circuit breaker unit through the main transformer bay high-voltage side circuit breaker unit and the main transformer unit. The generator outlet circuit breaker unit The other side is connected to the closed busbar, the generator outlet circuit breaker terminal voltage transformer is installed on the closed busbar, the generator unit and the closed busbar are softly connected, the excitation transformer and the closed busbar are softly connected, and the main transformer unit is softly connected. The low-voltage side of the main transformer is provided with a voltage transformer on the low-voltage side of the main transformer.

The main transformer bay high voltage side circuit breaker unit includes the main transformer bay circuit breaker bus side grounding switch, the main transformer bay circuit breaker bus side isolating switch, the main transformer bay circuit breaker main transformer side grounding switch, the main transformer bay circuit breaker main transformer Side isolation knife switch and main transformer interval circuit breaker.

The generator outlet circuit breaker unit includes the main transformer side grounding switch of the generator outlet circuit breaker, the generator side grounding switch of the generator outlet circuit breaker, the generator outlet circuit breaker isolation switch and the generator outlet circuit breaker.

The method for checking the phase of a single-bus system wiring unit according to the present invention comprises the following steps:

1) The high-voltage busbar unit is powered, the main transformer unit and the factory transformer unit are powered, and the amplitude, phase sequence, pressure difference and phase angle difference of the secondary voltage of the high-voltage busbar voltage transformer and the voltage transformer on the low-voltage side of the main transformer are checked;

2) Preparations for the nuclear phase test of the unit;

3) Disconnect the soft connection between the lead wire of the generator unit and the closed bus, and ensure that the disconnection point has a set safety distance;

4) Disconnect the soft connection between the high voltage side of the excitation transformer and the closed bus, and ensure that the disconnection point has a set safety distance;

5) Check to confirm that the primary insurance and secondary insurance of the voltage transformer of the generator outlet circuit breaker have been pushed to the running position;

6) Turn on the generator outlet circuit breaker and energy storage power supply, turn on the generator side grounding switch of the generator outlet circuit breaker, and close the generator outlet circuit breaker isolation switch;

7) Turn on the DC control power of the synchronizing device of the unit, select the input command of the synchronizing device in the DCS synchronizing control panel, observe whether the pressure difference and frequency difference of the synchronizing device indicate zero, and whether the whole step table indicates the synchronous position, and then send out the synchronization device. Frequency increase signal, then exit the synchronization device, measure the secondary voltage value, phase sequence and open triangle voltage value of the voltage transformer of the generator outlet circuit breaker terminal; when the pressure difference and frequency difference detection indications of the synchronization device are correct, and the power generation If the secondary voltage value, phase sequence and open delta voltage value of the voltage transformer at the machine end of the circuit breaker at the machine outlet are all correct, go to step 9), otherwise, go to step 8);

8) Disconnect the isolation switch of the generator outlet circuit breaker, disconnect the generator outlet circuit breaker and the energy storage power supply, and close the generator side grounding switch of the generator outlet circuit breaker, so that the generator outlet circuit breaker unit and the generator outlet circuit breaker operate. The terminal voltage transformer is de-energized, and then return to step 3) after finding and eliminating abnormal defects;

9) Disconnect the isolation switch of the generator outlet circuit breaker, disconnect the generator outlet circuit breaker and energy storage power supply, and close the generator side grounding switch of the generator outlet circuit breaker;

10) Restore the flexible connection between the lead wire of the generator unit and the closed bus, and restore the flexible connection between the excitation transformer and the closed bus;

11) The nuclear phase of the unit in the single bus system wiring mode ends.

The specific operations of step 2) are:

Check and confirm that the generator outlet circuit breaker is in the open position, the isolation switch of the generator outlet circuit breaker is in the open position, and the generator side grounding switch of the generator outlet circuit breaker is in the closed position.

The present invention has the following beneficial effects:

In the specific operation of the system and method for the core phase of the unit in the single bus system wiring mode, the soft connection between the generator unit and the excitation transformer and the closed bus is first disconnected, so as to ensure that the generator unit and the excitation transformer will not return electricity, and then The high-voltage busbar unit is used as the voltage source, and the same source phase is performed on the voltage transformer on the low-voltage side of the main transformer and the voltage transformer at the generator end of the circuit breaker at the generator outlet. It can quickly and accurately identify the problems of voltage transformer wiring defects, common box bus installation defects and transformer wiring method defects, and prevent generator shaft breakage caused by asynchronous grid connection. Accident, safety and reliability are high.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a flow chart of the present invention.

Among them, 1 is the high-voltage busbar unit, 2 is the high-voltage busbar voltage transformer, 3 is the main transformer interval high-voltage side circuit breaker unit, 4 is the main transformer unit, 5 is the main transformer low-voltage side voltage transformer, and 6 is the generator outlet circuit breaker Unit, 8 is the closed bus, 10 is the excitation transformer, 7 is the generator outlet circuit breaker terminal voltage transformer, and 9 is the generator unit.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Referring to FIG. 1 , the single bus system wiring mode unit core phase system according to the present invention includes a high voltage busbar voltage transformer 2, a high voltage busbar unit 1, a main transformer interval high voltage side circuit breaker unit 3, a main transformer unit 4, and a generator outlet. The circuit breaker unit 6, the factory transformer unit, the closed bus 8, the excitation transformer 10, the generator unit 9 and the terminal voltage transformers 7 of the circuit breakers at the outlet of the generator; the high voltage busbar voltage transformer 2 is installed on the high voltage busbar unit 1, and the high voltage The busbar unit 1 is connected to the factory transformer unit and one end of the generator outlet circuit breaker unit 6 through the main transformer interval high-voltage side circuit breaker unit 3 and the main transformer unit 4, and the other side of the generator outlet circuit breaker unit 6 is connected to the closed busbar 8 The generator outlet circuit breaker terminal voltage transformer 7 is installed on the closed busbar 8, the generator unit 9 and the closed busbar 8 are softly connected, the excitation transformer 10 and the closed busbar 8 are softly connected, and the main transformer unit 4 The low-voltage side of the main transformer is provided with a voltage transformer 5 on the low-voltage side of the main transformer.

The main transformer bay high-voltage side circuit breaker unit 3 includes the main transformer bay circuit breaker bus side grounding switch, the main transformer bay circuit breaker bus side isolating switch, the main transformer bay circuit breaker main transformer side grounding switch, the main transformer bay circuit breaker main switch. Transformer side isolation switch and main transformer bay circuit breaker; generator outlet circuit breaker unit 6 includes generator outlet circuit breaker main transformer side grounding switch, generator outlet circuit breaker generator side grounding switch, generator outlet circuit breaker isolation Knife switch and generator outlet circuit breaker.

Referring to Fig. 2, the method for the core phase of the single bus system wiring mode unit according to the present invention comprises the following steps:

1) The high-voltage busbar unit 1 receives power, the main transformer unit 4 and the factory transformer unit receive power, check and ensure the amplitude, phase sequence, and voltage of the secondary voltage of the high-voltage busbar voltage transformer 2 and the voltage transformer 5 on the low-voltage side of the main transformer. The difference and phase angle difference are correct, and then the external circuit supplies power to the high-voltage busbar unit 1, and then the main transformer unit 4 and the factory transformer unit are depressurized and then sent to the factory section to provide the factory load required when the unit starts. , put the grounding switch on the bus side of the main transformer bay circuit breaker in the high voltage side circuit breaker unit 3 of the main transformer bay, put the grounding switch on the bus side of the main transformer bay circuit breaker in the closed position, and set the main transformer bay circuit breaker on the main transformer side. The grounding switch is in the separate position, the main transformer side isolation switch of the main transformer bay circuit breaker is in the closed position, the main transformer bay circuit breaker is in the closed position, and the generator outlet circuit breaker generator side of the generator outlet circuit breaker unit 6 is in the closed position. The grounding switch is in the split position.

2) Preparations for the nuclear phase test of the unit;

3) Turn on the generator outlet circuit breaker and the energy storage power supply of the generator outlet circuit breaker unit 6, start the control power supply of the generator side grounding switch of the generator outlet circuit breaker unit 6, and start the generator outlet circuit breaker unit 6. The generator outlet circuit breaker isolates the control power supply of the switch, separates the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 and the generator side ground switch, and closes the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 to isolate the switch , close the generator outlet circuit breaker of the generator outlet circuit breaker unit 6, then disconnect the control power supply of the generator side grounding switch of the generator outlet circuit breaker unit 6, and disconnect the generator outlet circuit breaker unit 6 , the generator outlet circuit breaker isolates the control power supply of the knife switch;

4) Turn on the DC control power of the synchronous device of the unit, select the input command of the synchronous device in the DCS synchronous control panel, wait for the pressure difference and frequency difference of the synchronous device to indicate zero, and after the whole step table indicates the synchronization position, send out the same frequency speed increase Signal, after checking, exit the synchronization device;

Use the phase meter to test the system side voltage of the synchronization device and the generator terminal voltage at the same time to confirm whether the frequency difference of the secondary voltage is zero, whether the phase angle difference is less than 3°, and whether the voltage difference between the same phases is less than 5V. Use the phase meter Measure the secondary voltage value, phase sequence and open triangle voltage value of the voltage transformer 7 of the generator outlet circuit breaker. When the secondary voltage value, phase sequence and open triangle voltage value of 7 are correct, go to step 6), otherwise, go to step 5);

5) Turn on the control power supply of the generator side grounding switch of the generator outlet circuit breaker unit 6, turn on the control power supply of the generator outlet circuit breaker isolation switch of the generator outlet circuit breaker unit 6, and divide the Develop the generator outlet circuit breaker of the generator outlet circuit breaker unit 6, separate the generator outlet circuit breaker of the generator outlet circuit breaker unit 6, and close the generator outlet circuit breaker of the generator outlet circuit breaker unit 6. The generator side is grounded The knife switch makes the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 and the generator outlet circuit breaker machine terminal voltage transformer 7 lose power, and then returns to step 3) after finding and eliminating the abnormal unit defect;

6) Close the control power supply of the generator side grounding switch of the generator outlet circuit breaker unit 6, close the control power supply of the generator outlet circuit breaker isolation switch of the generator outlet circuit breaker unit 6, and pull The generator outlet circuit breaker of the development motor outlet circuit breaker unit 6, pull the generator outlet circuit breaker of the development motor outlet circuit breaker unit 6, and the generator side grounding switch, and close the generator outlet circuit breaker of the generator outlet circuit breaker unit 6. The generator side grounding switch, disconnect the generator outlet circuit breaker and the energy storage power supply, disconnect the generator outlet circuit breaker of the generator outlet circuit breaker unit 6 Control power supply of the generator side grounding switch, disconnect the generator outlet circuit breaker unit 6 The generator outlet circuit breaker isolates the control power for the knife switch.

7) Restore the soft connection between the lead wire of the generator unit 9 and the closed bus 8, and restore the flexible connection between the excitation transformer 10 and the closed bus 8.

8) The nuclear phase of the unit in the single bus system wiring mode ends.

The specific operation process of step 2) is:

201) Check and confirm that the generator outlet circuit breaker in the generator outlet circuit breaker unit 6 is in the open position, the isolation switch of the generator outlet circuit breaker is in the open position, and the generator side grounding switch of the generator outlet circuit breaker is in the closed position.

202 Disconnect the lead wire of the generator unit 9 from the soft connection of the closed busbar 8, and ensure that the disconnection point has a sufficient safety distance.

203) Disconnect the soft connection between the high voltage side of the excitation transformer 10 and the closed bus bar 8, and ensure that the disconnection point has a sufficient safety distance.

204) Check to confirm that the primary and secondary fuses of the voltage transformer 7 of the generator outlet circuit breaker are in good condition and have been pushed to the running position.

The present invention adopts the phase verification method of the unit in the single bus system wiring mode, and can also perform phase verification on the unit in the wiring mode of other similar systems, such as quadrangle wiring (without busbar system).

The above are only preferred embodiments of the present invention and do not limit the present invention. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technology of the present invention. within the scope of the program.

Claims (5)

1. A system of single-bus system wiring mode unit core phase, characterized in that it comprises a high-voltage busbar voltage transformer (2), a high-voltage busbar unit (1), a main transformer interval high-voltage side circuit breaker unit (3), a main transformer unit (4), generator outlet circuit breaker unit (6), factory transformer unit, closed busbar (8), excitation transformer (10), generator unit (9) and a number of generator outlet circuit breaker terminal voltage transformers ( 7); The high-voltage busbar voltage transformer (2) is installed on the high-voltage busbar unit (1). One end of the outlet circuit breaker unit (6) is connected to each other, the other side of the generator outlet circuit breaker unit (6) is connected to the closed busbar (8), and the generator outlet circuit breaker machine terminal voltage transformer (7) is installed in the closed busbar (8). On the busbar (8), the generator unit (9) and the closed busbar (8) are softly connected, the excitation transformer (10) and the closed busbar (8) are softly connected, and the low-voltage side of the main transformer unit (4) is provided with a Main transformer low voltage side voltage transformer (5). 2. The system of single bus system wiring mode unit core phase according to claim 1, characterized in that the main transformer bay high voltage side circuit breaker unit (3) comprises the main transformer bay circuit breaker bus side grounding switch, the main transformer bay Isolation switch on the bus side of the circuit breaker, ground switch on the main transformer side of the main transformer bay circuit breaker, isolation switch on the main transformer side of the main transformer bay circuit breaker and main transformer bay circuit breaker. 3. The system of single bus system wiring mode unit core phase according to claim 1, is characterized in that, generator outlet circuit breaker unit (6) comprises generator outlet circuit breaker main transformer side grounding switch, generator outlet circuit breaker Generator side grounding switch, generator outlet circuit breaker isolation switch and generator outlet circuit breaker. 4. a method for single-bus system wiring mode unit core phase, is characterized in that, based on the single-bus system wiring mode unit core-phase system described in claim 2, comprises the following steps: 1) The high-voltage busbar unit (1) receives power, the main transformer unit (4) and the factory transformer unit receive power, and check the amplitude of the secondary voltage of the high-voltage busbar voltage transformer (2) and the voltage transformer on the low-voltage side of the main transformer (5). , phase sequence, pressure difference and phase angle difference; 2) Preparations for the nuclear phase test of the unit; 3) Disconnect the flexible connection between the lead wire of the generator unit (9) and the closed busbar (8), and ensure that the disconnection point has a set safety distance; 4) Disconnect the soft connection between the high voltage side of the excitation transformer (10) and the closed busbar (8), and ensure that the disconnection point has a set safety distance; 5) Check to confirm that the primary fuse and secondary fuse of the voltage transformer (7) of the generator outlet circuit breaker have been pushed to the running position; 6) Turn on the generator outlet circuit breaker and energy storage power supply, turn on the generator side grounding switch of the generator outlet circuit breaker, and close the generator outlet circuit breaker isolation switch; 7) Turn on the DC control power of the synchronizing device of the unit, select the input command of the synchronizing device in the DCS synchronizing control panel, observe whether the pressure difference and frequency difference of the synchronizing device indicate zero, and whether the whole step table indicates the synchronous position, and then send out the synchronization device. Frequency increase signal, and then exit the synchronization device, measure the secondary voltage value, phase sequence and open triangle voltage value of the voltage transformer (7) of the generator outlet circuit breaker terminal; when the pressure difference and frequency difference detection indication of the synchronization device is correct , and the secondary voltage value, phase sequence and open-delta voltage value of the generator outlet circuit breaker terminal voltage transformer (7) are all correct, then go to step 9), otherwise, go to step 8); 8) Disconnect the isolation switch of the generator outlet circuit breaker, disconnect the generator outlet circuit breaker and the energy storage power supply, and close the generator side grounding switch of the generator outlet circuit breaker, so that the generator outlet circuit breaker unit (6) and the generator outlet The voltage transformer (7) at the machine end of the circuit breaker loses power, and then returns to step 3 after finding and eliminating abnormal defects; 9) Disconnect the isolation switch of the generator outlet circuit breaker, disconnect the generator outlet circuit breaker and energy storage power supply, and close the generator side grounding switch of the generator outlet circuit breaker; 10) Restore the flexible connection between the lead wire of the generator unit (9) and the closed busbar (8), and restore the flexible connection between the excitation transformer (10) and the closed busbar (8); 11) The nuclear phase of the unit in the single bus system wiring mode ends. 5. the method for single bus system wiring mode unit core phase according to claim 4, is characterized in that, the concrete operation of step 2) is: Check and confirm that the generator outlet circuit breaker is in the open position, the isolation switch of the generator outlet circuit breaker is in the open position, and the generator side grounding switch of the generator outlet circuit breaker is in the closed position.

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