CN110514911A - A kind of system and method for power plant high voltage bus power supply nuclear phase - Google Patents

Abstract

The invention discloses a system and method for phase verification of a high-voltage bus power supply in a power plant. Incoming line voltage transformer, backup power supply unit, backup power common box bus, backup power inlet soft connection, backup power inlet switch, backup power inlet voltage transformer, high-voltage bus voltage transformer and high-voltage bus, the system and method It can realize high-voltage bus power supply nuclear phase, and has high safety and reliability.

Description

System and method for nuclear phase of high-voltage bus power supply in power plant

technical field

The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a system and method for phase verification of a high-voltage bus power supply in a power plant.

Background technique

Power plants and large-scale factories and mines are usually equipped with 6kV or 10kV high-voltage factory busbars to meet the needs of factory high-voltage loads. Usually, the high-voltage busbar is provided with two power supplies. The working power supply line is taken from the low-voltage side of the high-voltage factory transformer through the working power supply line switch; the standby power supply is taken from the low-voltage side of the standby transformer through the standby power supply line switch, and the main The circuit breaker is connected to the high voltage bus. When the high-voltage bus is running, it is usually powered by one power supply, and the power supply switching is completed by the factory power fast switching device. There are three ways to switch between the working power supply and the standby power supply: parallel switching, simultaneous switching and series switching. During parallel switching and simultaneous switching, there are scenarios where the two power supplies are closed-loop, so it is necessary to check the phases of the working power supply and the backup power supply in advance to prevent phase-to-phase short-circuit accidents caused by non-synchronous parallel connection.

Under normal circumstances, according to the design, the high-voltage power supply through the angle conversion of the main transformer and the high-voltage plant transformer should obtain the working power input power supply and the standby power supply after the high-voltage power supply passes through the standby angle conversion should be in the same phase, in the same phase sequence, and at the same angle. Then, because the wiring mode of the working transformer does not conform to the design, non-in-phase accidents caused by wrong wiring of the common box bus on the low-voltage side of the transformer occur from time to time.

The current phase verification method of the high-voltage bus power supply is: pull the incoming switch of the working or standby power out of the switch room, artificially prop up the baffle of the contact inside the switch, and use a high-voltage phase verification rod to perform a phase verification. This method is accurate in phase verification, but in the switch room, artificially propping up the baffle violates safety regulations. In a small space, phase verification is performed with a phase verification rod. The wiring is often crossed, which is very dangerous and many accidents have occurred. Therefore, it is of great significance to find a safe and reliable high-voltage bus power supply phase nuclear system and method.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a system and method for phase verification of high-voltage bus power in a power plant. The system and method can realize phase verification of high-voltage bus power, and have high safety and reliability.

In order to achieve the above-mentioned purpose, the high-voltage bus power nuclear phase system of the power plant according to the present invention includes a working power unit, a generator circuit breaker unit, a working power common box bus, a working power incoming soft connection, a working power incoming switch, a working Power inlet voltage transformer, backup power unit, backup power common box bus, backup power inlet soft connection, backup power inlet switch, backup power inlet voltage transformer, high-voltage bus voltage transformer and high-voltage bus;

The generator circuit breaker unit is connected with the working power supply unit, and the output end of the working power supply unit is connected with one end of the working power supply incoming line switch and the working power supply incoming line voltage transformer through the working power common box busbar and the working power supply incoming line soft connection; The backup power supply unit is connected to one end of the backup power inlet switch and the backup power inlet voltage transformer through the backup power common box busbar and the backup power inlet soft connection; the other end of the backup power inlet switch is connected to the working power inlet switch. The other end and the high-voltage bus voltage transformer are connected to the high-voltage bus, the working power incoming switch position node, the backup power incoming switch position node, the secondary voltage side of the working power incoming voltage transformer, and the standby power incoming voltage transformer The secondary voltage side of the high-voltage busbar voltage transformer and the secondary voltage side of the high-voltage busbar voltage transformer are both connected to the busbar quick-cutting device.

The working power supply unit includes the working power high-voltage busbar, the working power high-voltage side circuit breaker, the main transformer and the high-voltage working transformer. Connection, the other end of the high-voltage working transformer is connected to the common box bus of the working power supply.

The backup power supply unit includes a backup power high-voltage side bus, a backup power high-voltage side circuit breaker and a backup transformer, wherein the backup power high-voltage side bus is connected to the backup power common box bus through the backup power high-voltage side circuit breaker and backup transformer.

The generator circuit breaker unit includes a generator and a generator outlet circuit breaker, wherein the output end of the generator is connected to the high-voltage working transformer through the generator outlet circuit breaker.

The method for nuclear phase of power plant high-voltage bus power supply of the present invention comprises the following steps:

1) Preparatory work for nuclear phase test of high-voltage bus power supply;

2) Close the circuit breaker on the high-voltage side of the standby power supply and the high-voltage side circuit breaker of the working power supply, so that the busbar of the common box of the working power supply and the busbar of the common box of the standby power supply are charged stably;

3) Detect the voltage, amplitude and phase sequence of the voltage transformer of the incoming line of the working power supply and the incoming voltage transformer of the backup power supply through the phase meter, and judge the voltage, Whether the amplitude and phase sequence are correct, judge whether the measured value of the secondary side of the voltage transformer of the working power supply line is consistent with the theoretical calculation value of the secondary side of the voltage transformer of the working power supply line at the rated voltage of the system, when the voltage transformer of the working power supply line When the measured value of the secondary side of the transformer is consistent with the theoretical calculation value of the secondary side of the voltage transformer of the working power supply line at the rated voltage of the system, it means that the wiring of the working power supply unit is correct; judge the secondary side of the voltage transformer of the standby power supply line Whether the measured value is consistent with the theoretical calculation value of the secondary side of the backup power input voltage transformer at the rated voltage of the system, and whether the secondary side measured value of the backup power input voltage transformer is consistent with the system rated voltage When the theoretical calculation value of the secondary side of the circuit is consistent, it means that the wiring of the standby power supply unit is correct. When the wiring of the standby power supply unit and the wiring of the working power supply unit are correct, it means that the wiring of the secondary circuit is complete and correct, and then go to step 5); otherwise , go to step 4);

4) When the wiring of the working power supply unit is incorrect, disconnect the circuit breaker on the high voltage side of the working power supply; when the wiring of the standby power supply unit is incorrect, disconnect the circuit breaker on the high voltage side of the standby power supply, find and eliminate the defect of the abnormal unit and return to step 2);

5) Close the incoming switch of the working power supply and the incoming switch of the standby power supply, so that the incoming switch of the working power supply, the incoming switch of the standby power supply, the high-voltage busbar, the voltage transformer of the incoming line of the working power supply and the voltage transformer of the incoming line of the standby power supply are charged;

6) Measure the actual voltage of the secondary side of the high-voltage bus voltage transformer, the working power inlet voltage transformer and the backup power inlet voltage transformer;

7) Separately judge whether the actual voltage on the secondary side of the voltage transformer on the high-voltage bus, the voltage transformer on the incoming line of the working power supply, and the voltage transformer on the incoming line of the backup power supply are consistent with the theoretically calculated value of the voltage on the secondary side, and at the same time judge the voltage transformers on the high-voltage bus , Whether the phase sequence of the voltage transformer of the working power incoming line and the voltage transformer of the backup power incoming line is the correct phase sequence, in order to complete the voltage transformer of the high-voltage bus, the voltage transformer of the working power incoming line and the voltage transformer of the standby power incoming line Homologous nuclear phase, when the results of the homologous nuclear phase of the high-voltage bus voltage transformer, working power incoming line voltage transformer and backup power incoming line voltage transformer are all correct, it means that the working power unit incoming line, high-voltage bus and standby If the primary equipment and secondary equipment of the power supply unit are normal, go to step 9); otherwise, go to step 8);

8) Disconnect the incoming switch of the working power supply and the incoming switch of the standby power supply, so that the incoming switch of the working power supply, the incoming switch of the standby power supply, the high-voltage busbar, the voltage transformer of the incoming line of the working power supply and the voltage transformer of the incoming line of the standby power supply are de-energized, Find and eliminate the abnormal unit defect and return to step 5);

9) Disconnect the incoming switch of the working power supply and the incoming switch of the backup power supply, restore the soft connection between the incoming switch of the working power supply and the busbar of the common box of the working power supply, and restore the connection between the incoming switch of the standby power supply and the busbar of the common box of the standby power supply. Soft connection, then go to step 10);

10) Close the circuit breaker on the high-voltage side of the working power supply and the high-voltage side circuit breaker of the standby power supply, and go to step 11 when the standby power supply unit, the working power supply unit, the busbar of the common box of the working power supply and the busbar of the common box of the standby power supply are charged stably;

11) Perform a non-homologous phase check on the working power unit and the standby power unit, check whether the polarity of the incoming voltage of the working power unit is consistent with that of the standby power unit, and check whether the polarity of the incoming voltage of the working power unit is When the polarity of the incoming line voltage of the standby power supply unit is the same, go to step 13); otherwise, go to step 12);

12) Disconnect the high-voltage side circuit breaker of the working power supply and the high-voltage side circuit breaker of the backup power supply, so that the working power supply unit and the backup power supply unit are de-energized, and then return to step 10 after finding and eliminating abnormal unit defects;

13) The nuclear phase test of the high-voltage bus power supply is over.

The specific operation process of step 1) is:

101) Install the working power supply unit, backup power supply unit, standby power common box bus, working power common box bus, high voltage bus and working power incoming line voltage transformer, standby power incoming line voltage transformer and high voltage bus voltage transformer within the range For primary equipment and secondary equipment, make sure that the wiring of the secondary equipment is correct. The primary safety wiring of the backup power incoming voltage transformer and the high-voltage bus voltage transformer is in good condition, and the secondary circuit breaker of the working power incoming voltage transformer, the backup power incoming voltage transformer and the high-voltage bus voltage transformer is in the closed state;

102) The generator is shut down, the generator outlet circuit breaker is in the off state, and the soft connection of the working power incoming line and the standby power incoming line are removed;

103) Perform static debugging of the busbar quick-cutting device, and carry out the transmission experiment of the busbar quick-cutting device with the working power inlet switch and the backup power inlet switch;

104) Adjust the opening and closing states of the working power inlet switch and the backup power inlet switch to the opposite state, and adjust the working power high-voltage side circuit breaker and the backup power high-voltage side circuit breaker to the hot standby state.

The specific operation of step 3) is: use the phase meter to measure and record the voltage values and Phase sequence, to determine whether the phase sequence is a positive phase sequence, and at the same time determine whether the voltage value is consistent with the normal output voltage value under rated conditions;

Check the voltage value and phase sequence of each group of voltage transformers in the local terminal box of the high-voltage bus voltage transformer, the working power inlet voltage transformer and the backup power inlet voltage transformer on the bus quick-cutting device, and separate them Compare with the voltage value and phase sequence collected by the phase meter to ensure that the wiring and polarity configuration of the working power incoming line voltage transformer and the backup power incoming line voltage transformer are correct.

In step 7), the working power inlet switch, the working power inlet voltage transformer, the backup power inlet switch, the backup power inlet voltage transformer, the high-voltage busbar, and the high-voltage busbar voltage transformer are all in the homologous system. The source system is under the rated voltage. At this time, theoretically, the voltage polarity of the voltage transformer of the working power supply line, the voltage polarity of the high-voltage bus voltage transformer 8 and the voltage polarity of the backup power supply line voltage transformer are consistent. When the voltage polarity of any voltage transformer is inconsistent with the other two, there is a wiring or performance problem in the voltage transformer. At this time, it is necessary to find and eliminate the defects of the abnormal voltage transformer and continue the homologous nuclear phase test again;

On the screen of the bus quick switch device, read the angle difference, voltage difference and frequency difference between the input voltage of the working power supply and the high-voltage bus voltage. When it is zero, no processing will be done. When any of the angle difference, voltage difference and frequency difference between the working power input line voltage and the high-voltage bus voltage is not zero, it is necessary to find and eliminate the defects of the abnormal voltage transformer and continue. homologous nuclear phase test.

The specific operation of step 9) is: disconnect the incoming line switch of the working power supply and the incoming line switch of the standby power supply. Then hang the grounding wire, then restore the soft connection between the working power incoming switch and the working power common box bus, and at the same time restore the soft connection between the standby power incoming switch and the standby power common box bus, then remove the grounding wire, and then switch to Go to step 10).

Step 11) also includes the following steps:

1101) Check whether the secondary voltage amplitude of the voltage transformer of the incoming line of the working power supply is the rated voltage divided by the transformation ratio of the voltage transformer of the incoming line of the working power supply, whether the phase sequence is a positive phase sequence, and whether the zero-sequence voltage is zero;

1102) Check whether the secondary voltage amplitude of the incoming voltage transformer of the standby power supply is the rated voltage divided by the transformation ratio of the voltage transformer of the incoming line of the standby power supply, whether the phase sequence is a positive phase sequence, and whether the zero-sequence voltage is zero;

1103) Check whether the secondary voltage amplitude of the high-voltage bus voltage transformer is the rated voltage divided by the transformation ratio of the high-voltage bus voltage transformer, whether the phase sequence is positive phase sequence, and whether the zero-sequence voltage is zero;

1104) Check whether the secondary voltage frequency difference of the working power incoming line voltage transformer, backup power incoming line voltage transformer and high-voltage bus voltage transformer is zero, whether the phase angle difference is less than 3°, and whether the voltage difference between the same phases is less than 5V ;

1105) Check whether the secondary voltage frequency difference of the working power inlet voltage transformer, backup power inlet voltage transformer and high-voltage bus voltage transformer read on the bus quick-cutting device 15 is zero, and whether the phase angle difference is less than 3° , Whether the voltage difference between the same phases is less than 5V.

The present invention has the following beneficial effects:

The system and method for the nuclear phase of the high-voltage bus power supply of the power plant described in the present invention, in the specific operation, first use the working power supply unit and the backup power supply unit as the voltage source, and the working power supply incoming line, the working power supply incoming line voltage transformer, the high-voltage bus , high-voltage busbar voltage transformer, standby power supply incoming line, and standby power supply incoming line voltage transformer for homologous phase verification. After confirming that the secondary system accurately reflects the situation of the primary system, use the standby power supply unit and the working power supply unit for non-homologous Phase verification, high test efficiency, high test accuracy, eliminates the danger of manual operation of primary equipment, can quickly and accurately identify voltage transformer wiring defects, common box bus installation defects and transformer wiring defects, and eliminate phase-to-phase failures caused by non-synchronous parallel connections Short circuit phenomenon, high safety and reliability, and the present invention is based on the working power supply unit, and can perform phase verification on multiple backup power supply units, and is suitable for high-voltage busbars that use dual power supply incoming lines, three power supply incoming lines, and other multiple power supplies The high-voltage bus power supply of the incoming line works with phase verification, which is suitable for power plants and large-scale factories and mines with different wiring methods. In addition, the present invention confirms each other through the phase meter measurement and the reading of the bus quick-cut device, which has high accuracy and reliability. In addition, the working power unit or backup power unit is used as the power supply of the same source nuclear phase, no external power supply is required, the economy is better, and the illegal operation of artificially opening the switch partition of the power supply line is avoided, and a nuclear operation in a small space is avoided. Relative risk, greatly reducing the probability of personal injury, high safety.

Description of drawings

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

Fig. 2 is a flowchart of the present invention.

Among them, 1 is the working power supply unit, 2 is the common box bus of the working power supply, 3 is the soft connection of the working power incoming line, 4 is the voltage transformer of the working power incoming line, 5 is the working power incoming line switch, and 6 is the working power incoming line switch Position node, 7 is the high-voltage bus, 8 is the voltage transformer of the high-voltage bus, 9 is the backup power inlet switch, 10 is the position node of the backup power inlet switch, 11 is the backup power inlet voltage transformer, 12 is the backup power inlet Soft connection, 13 is the backup power common box bus, 14 is the backup power unit, 15 is the bus quick switch device, 16 is the generator circuit breaker unit, 1DL is the working power inlet switch, 2DL is the backup power inlet switch, 3DL is The high-voltage side circuit breaker of the working power supply, 4DL is the high-voltage side circuit breaker of the backup power supply, and the GCB is the generator outlet circuit breaker.

Detailed ways

The present invention is described in further detail below in conjunction with accompanying drawing:

With reference to Fig. 1, the system of the high-voltage bus power supply nuclear phase of the power plant according to the present invention includes a working power unit 1, a generator circuit breaker unit 16, a working power common box bus 2, a working power inlet soft connection 3, and a working power inlet Switch 5, Working power incoming line voltage transformer 4, Standby power supply unit 14, Standby power common box busbar 13, Standby power supply incoming line soft connection 12, Standby power supply incoming line switch 9, Standby power supply incoming line voltage transformer 11, High voltage busbar The voltage transformer 8 and the high-voltage bus 7; the generator circuit breaker unit 16 is connected to the working power supply unit 1, and the output end of the working power supply unit 1 is connected to the working power supply incoming line through the working power common box bus 2 and the working power supply incoming line soft connection 3 One end of the switch 5 is connected to the voltage transformer 4 of the working power input line; the backup power unit 14 is connected to one end of the backup power input switch 9 and the backup power input voltage The transformers 11 are connected; the other end of the backup power inlet switch 9, the other end of the working power inlet switch 5, and the high-voltage bus voltage transformer 8 are connected with the high-voltage bus 7, the working power inlet switch position node 6, the backup power supply Incoming line switch position node 10, the secondary voltage side of the working power incoming line voltage transformer 4, the secondary voltage side of the standby power incoming line voltage transformer 11 and the secondary voltage side of the high-voltage bus voltage transformer 8 are all connected to the bus fast Cutting device 15 is connected.

The working power supply unit 1 includes the high-voltage busbar of the working power supply, the high-voltage side circuit breaker 1DL of the working power supply, the main transformer and the high-voltage working transformer. The other end of the high-voltage working transformer is connected to the common box bus bar 2 of the working power supply; the backup power supply unit 14 includes a backup power high-voltage side bus, a backup power high-voltage side circuit breaker 2DL and a backup transformer, wherein the backup power high-voltage side The busbar is connected to the common-box busbar 13 of the standby power supply through the backup power high-voltage side circuit breaker 2DL and the backup transformer; the generator circuit breaker unit 16 includes the generator and the generator outlet circuit breaker GCB, wherein the output end of the generator passes through the generator outlet The circuit breaker GCB is connected with the high voltage working transformer.

With reference to Fig. 2, the method for nuclear phase of power plant high-voltage bus power supply of the present invention comprises the following steps:

1) Preparatory work for nuclear phase test of high-voltage bus power supply;

2) Close the circuit breaker 2DL on the high-voltage side of the standby power supply and the circuit breaker 1DL on the high-voltage side of the working power supply, so that the busbar 2 of the common box for the working power supply and the busbar 13 for the common box of the standby power supply are charged stably;

3) Detect the voltage, amplitude and phase sequence of the voltage transformer 4 of the incoming line of the working power supply and the voltage transformer 11 of the incoming line of the standby power supply through the phase table, and judge the voltage transformer 4 of the incoming line of the working power supply and the voltage transformer of the incoming line of the standby power supply Whether the voltage, amplitude and phase sequence of 11 are correct, judge whether the measured value of the secondary side of the voltage transformer 4 of the working power supply line is consistent with the theoretical calculation value of the secondary side of the voltage transformer 4 of the working power supply line at the rated voltage of the system, When the measured value of the secondary side of the voltage transformer 4 of the working power supply line is consistent with the theoretical calculation value of the secondary side of the voltage transformer 4 of the working power supply line at the rated voltage of the system, it means that the wiring of the working power supply unit 1 is correct; judge the standby power supply Whether the measured value of the secondary side of the incoming line voltage transformer 11 is consistent with the theoretically calculated value of the secondary side of the backup power incoming line voltage transformer 11 at the rated voltage of the system, when the measured value of the secondary side of the standby power incoming line voltage transformer 11 When it is consistent with the theoretically calculated value of the secondary side of the backup power input voltage transformer 11 at the rated voltage of the system, it means that the backup power supply unit 14 is connected correctly. When the connection of the backup power supply unit 14 and the working power supply unit 1 are both correct, If the wiring of the secondary circuit is complete and correct, go to step 5); otherwise, go to step 4);

4) When the wiring of the working power supply unit 1 is wrong, disconnect the circuit breaker 1DL at the high voltage side of the working power supply; when the wiring of the standby power supply unit 14 is wrong, disconnect the circuit breaker 2DL at the high voltage side of the standby power supply, find and eliminate the defect of the abnormal unit and return step 2);

5) Close the working power inlet switch 5 and the backup power inlet switch 9, so that the working power inlet switch 5, the backup power inlet switch 9, the high-voltage bus 7, the working power inlet voltage transformer 4 and the backup power inlet voltage Transformer 11 is electrified;

6) Measuring the secondary side actual voltages of the high-voltage bus voltage transformer 8, the voltage transformer 4 for the incoming line of the working power supply and the voltage transformer 11 for the incoming line of the backup power supply;

7) Determine whether the actual voltage on the secondary side of the voltage transformer 8 of the high-voltage bus, the voltage transformer 4 of the incoming line of the working power supply, and the voltage transformer 11 of the incoming line of the backup power supply are consistent with the theoretically calculated value of the voltage on the secondary side, and at the same time judge whether the voltage transformer of the high-voltage bus Whether the phase sequence of the voltage transformer 8, the voltage transformer 4 of the incoming line of the working power supply and the voltage transformer 11 of the incoming line of the backup power supply is the correct phase sequence, so as to complete the phase sequence of the voltage transformer 8 of the high voltage bus, the voltage transformer 4 of the incoming line of the working power supply and The homologous nuclear phase of the standby power incoming line voltage transformer 11, when the homologous nuclear phase results of the high-voltage bus voltage transformer 8, the working power incoming line voltage transformer 4 and the standby power incoming line voltage transformer 11 are all correct, Then it shows that the primary equipment and secondary equipment of the incoming line of the working power supply unit 1, the high-voltage bus bar 7 and the standby power supply unit 14 are all normal, then go to step 9), otherwise, then go to step 8);

8) Disconnect the working power inlet switch 5 and the backup power inlet switch 9, so that the working power inlet switch 5, the backup power inlet switch 9, the high-voltage bus 7, the working power inlet voltage transformer 4 and the backup power inlet Potential transformer 11 is de-energized, then find and eliminate the abnormal unit defect and return to step 5);

9) Disconnect the working power inlet switch 5 and the backup power inlet switch 9, restore the soft connection between the working power inlet switch 5 and the working power common box bus 2, and simultaneously restore the backup power inlet switch 9 and the backup power common Soft connection between box bus bars 13, then go to step 10);

10) Close the circuit breaker 1DL on the high-voltage side of the working power supply and the circuit breaker 2DL on the high-voltage side of the standby power supply. When the standby power supply unit 14, the working power supply unit 1, the busbar 2 of the working power supply box and the busbar 13 of the backup power supply box are charged and stable, go to step 11 );

11) Perform non-homologous phase verification on the working power supply unit 1 and the standby power supply unit 14, check whether the polarity of the incoming line voltage of the working power supply unit 1 is consistent with the polarity of the incoming line voltage of the standby power supply unit 14, when the working power supply unit 1 enters When the polarity of the line voltage is consistent with the polarity of the incoming line voltage of the standby power supply unit 14, then go to step 13), otherwise, go to step 12);

12) Disconnect the high-voltage side circuit breaker 1DL of the working power supply and the high-voltage side circuit breaker 2DL of the backup power supply, so that the working power supply unit 1 and the backup power supply unit 14 are de-energized, and then return to step 10 after finding and eliminating abnormal unit defects);

13) The nuclear phase test of the high-voltage bus power supply is over.

The specific operation process of step 1) is:

101) Install working power supply unit 1, backup power supply unit 14, backup power common box busbar 13, working power supply common box busbar 2, high voltage busbar 7, working power incoming line voltage transformer 4, standby power incoming line voltage transformer 11 and high voltage For the primary equipment and secondary equipment within the range of bus voltage transformer 8, make sure that the secondary equipment is connected correctly, the working power input voltage transformer 4, the standby power input voltage transformer 11 and the secondary circuit of high voltage bus voltage transformer 8 Open circuit phenomenon, the voltage transformer 4 of the incoming line of the working power supply, the voltage transformer 11 of the incoming line of the backup power supply and the primary insurance connection of the voltage transformer 8 of the high-voltage busbar are good, the voltage transformer 4 of the incoming line of the working power supply, and the voltage transformer 11 of the incoming line of the standby power supply And the secondary circuit breaker of the high-voltage bus voltage transformer 8 is in the closing state;

102) The generator is shut down, the generator outlet circuit breaker GCB is in the off state, and the soft connection 3 of the incoming line of the working power supply and the soft connection 12 of the incoming line of the backup power supply are removed;

103) Carry out the static debugging of the busbar quick-cutting device 15, and carry out the transmission experiment of the busbar quick-cutting device 15 with the working power inlet switch 5 and the backup power inlet switch 9;

104) Adjust the opening and closing states of the working power incoming switch 5 and the backup power incoming switch 9 to the opposite state, and adjust the working power high-voltage side circuit breaker 1DL and the backup power high-voltage side circuit breaker 2DL to the hot standby state.

The specific operation of step 3) is: use the phase meter to measure and record the voltage transformers of each group in the local terminal box of the high-voltage bus voltage transformer 8, the working power incoming line voltage transformer 4 and the backup power incoming line voltage transformer 11. Voltage value and phase sequence, to determine whether the phase sequence is a positive phase sequence, and at the same time determine whether the voltage value is consistent with the normal output voltage value under rated conditions;

Check the voltage value and phase sequence of each group of voltage transformers in the local terminal box of the high-voltage bus voltage transformer 8, the working power inlet voltage transformer 4 and the standby power inlet voltage transformer 11 on the bus quick-cutting device 15, And compare it with the voltage value and phase sequence collected by the phase meter to ensure that the wiring and polarity configuration of the working power incoming line voltage transformer 4 and the backup power incoming line voltage transformer 11 are correct.

In step 7), the working power inlet switch 5, the working power inlet voltage transformer 4, the backup power inlet switch 9, the backup power inlet voltage transformer 11, the high-voltage bus 7, and the high-voltage bus voltage transformer 8 are all in the same position. In the source system, the same-source system is under the rated voltage. At this time, theoretically, the voltage polarity of the working power input voltage transformer 4, the voltage polarity of the high-voltage bus voltage transformer 8 and the backup power input voltage transformer 11 When the voltage polarity of any voltage transformer is inconsistent with the other two, there is a wiring or performance problem in the voltage transformer. At this time, it is necessary to find and eliminate the defects of the abnormal voltage transformer and continue. homologous nuclear phase test;

On the screen of the busbar quick-cutting device 15, read the angle difference, pressure difference and frequency difference between the working power inlet voltage and the high-voltage bus 7 voltage, when the angle difference, the pressure difference and the voltage difference between the working power inlet voltage and the high-voltage bus 7 voltage When the frequency difference is zero, no processing will be done. When any of the angle difference, voltage difference and frequency difference between the working power input line voltage and the voltage of the high-voltage bus 7 is not zero, it is necessary to find and eliminate the abnormal voltage transformer. Defects again continue with homologous nuclear phase testing.

The specific operations of step 9) are: disconnect the working power inlet switch 5 and the backup power inlet switch 9, the backup power common box bus 13, the working power common box bus 2, the working power inlet switch 5 and the backup power inlet switch 9 is in the power-off state, then hang the grounding wire, then restore the soft connection between the working power incoming switch 5 and the working power common box bus 2, and simultaneously restore the standby power incoming switch 9 and the standby power common box bus 13. Soft connect, then remove the ground wire, then go to step 10).

Step 11) also includes the following steps:

1101) Check whether the secondary voltage amplitude of the voltage transformer 4 of the incoming line of the working power supply is the rated voltage divided by the transformation ratio of the voltage transformer 4 of the incoming line of the working power supply, whether the phase sequence is a positive phase sequence, and whether the zero-sequence voltage is zero;

1102) Check whether the secondary voltage amplitude of the standby power supply incoming line voltage transformer 11 is the rated voltage divided by the transformation ratio of the standby power supply incoming line voltage transformer 11, whether the phase sequence is positive phase sequence, and whether the zero sequence voltage is zero;

1103) Check whether the secondary voltage amplitude of the high-voltage bus voltage transformer 8 is the rated voltage divided by the transformation ratio of the high-voltage bus voltage transformer 8, whether the phase sequence is positive phase sequence, and whether the zero-sequence voltage is zero;

1104) Check whether the secondary voltage frequency difference of the working power supply incoming line voltage transformer 4, the backup power supply incoming line voltage transformer 11 and the high-voltage bus voltage transformer 8 is zero, whether the phase angle difference is less than 3°, and whether the voltage difference between the same phases Is it less than 5V;

1105) Check whether the secondary voltage frequency difference of the working power inlet voltage transformer 4, the backup power inlet voltage transformer 11 and the high-voltage bus voltage transformer 8 read on the bus quick-cutting device 15 is zero, and whether the phase angle difference Less than 3°, whether the voltage difference between the same phase is less than 5V.

The specific operation process of finding and eliminating abnormal unit defects in step 12) is:

1201) Check whether the wiring mode and design of the standby transformer, the main transformer and the high-voltage working transformer are consistent;

1202) Check whether the backup transformer, the main transformer, the high-voltage working transformer, the common box bus 2 of the working power supply and the common box bus 13 of the standby power supply are constructed according to the drawings, and check whether each phase of the standby transformer corresponds to the wiring of each phase of the standby power inlet switch 9; at the same time Check whether each phase of the high-voltage working transformer corresponds to the wiring of each phase of the working power input switch 5.

When the present invention carries out the nuclear phase test of the high-voltage bus power supply, the working power supply unit 1 is used as the voltage source to connect the working power supply line, the working power supply line voltage transformer 4, the high-voltage bus bar 7, the high-voltage bus bar voltage transformer 8, the standby power supply line and the The voltage transformer 11 of the incoming line of the backup power supply is subjected to homologous phase verification. After confirming that the secondary system accurately reflects the situation of the primary system, the backup power supply unit 14 and the working power supply unit 1 are used for non-homologous phase verification. The test efficiency is high and the test is correct. High reliability, eliminates the danger of manual operation of primary equipment, can quickly and accurately identify, voltage transformer wiring defects, common box bus installation defects and transformer wiring defects, and eliminate phase-to-phase short circuits caused by non-synchronous parallel connections. In addition, the present invention is based on the working power supply unit 1, and can perform phase verification on multiple backup power supply units 14, and is applicable to high-voltage bus power supplies with dual power supply incoming lines, three power supply incoming lines, and other multi-power supply incoming lines for the high-voltage bus 7 nuclear phase work.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All 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 technical aspects of the present invention. within the scope of protection of the scheme.

Claims (10)

1. A system for nuclear phase of high-voltage bus power supply in a power plant, characterized in that it includes a working power supply unit (1), a generator circuit breaker unit (16), a working power supply common box busbar (2), and a working power supply incoming line soft connection (3), working power inlet switch (5), working power inlet voltage transformer (4), backup power unit (14), backup power common box busbar (13), backup power inlet soft connection (12), Backup power inlet switch (9), backup power inlet voltage transformer (11), high-voltage bus voltage transformer (8) and high-voltage bus (7); The generator circuit breaker unit (16) is connected with the working power supply unit (1), and the output end of the working power supply unit (1) is connected to the working power supply through the common box bus bar (2) of the working power supply and the soft connection (3) of the working power supply incoming line. One end of the line switch (5) is connected to the working power supply incoming line voltage transformer (4); the standby power supply unit (14) is connected to the standby power supply via the standby power common box busbar (13) and the standby power supply incoming line soft connection (12). One end of the line switch (9) is connected to the backup power incoming line voltage transformer (11); the other end of the standby power incoming line switch (9), the other end of the working power incoming line switch (5) and the high-voltage bus voltage transformer (8) Connected to the high-voltage busbar (7), the working power inlet switch position node (6), the backup power inlet switch position node (10), the secondary voltage side of the working power inlet voltage transformer (4), Both the secondary voltage side of the backup power incoming voltage transformer (11) and the secondary voltage side of the high-voltage bus voltage transformer (8) are connected to the bus quick-cut device (15). 2. The system according to claim 1, characterized in that, the working power supply unit (1) comprises a working power high-voltage bus, a working power high-voltage side circuit breaker (1DL), a main transformer and a high-voltage working power supply unit according to claim 1. The transformer, the high-voltage busbar of the working power supply are connected to one end of the high-voltage working transformer and the generator circuit breaker unit (16) through the high-voltage side circuit breaker (1DL) of the working power supply and the main transformer, and the other end of the high-voltage working transformer is connected to the common box busbar of the working power supply ( 2) Connected. 3. the system of power plant high-voltage busbar power nuclear phase according to claim 1, it is characterized in that, backup power supply unit (14) comprises backup power supply high-voltage side busbar, backup power supply high-voltage side circuit breaker (2DL) and backup transformer, wherein , the backup power high-voltage side busbar is connected to the backup power supply common box busbar (13) through the backup power high-voltage side circuit breaker (2DL) and the backup transformer. 4. The system of the high-voltage bus power nuclear phase of the power plant according to claim 1 is characterized in that the generator circuit breaker unit (16) comprises a generator and a generator outlet circuit breaker (GCB), wherein the output of the generator The terminal is connected to the high-voltage working transformer through the generator outlet circuit breaker (GCB). 5. a method for nuclear phase of high-voltage bus power supply in power plant, is characterized in that, based on the system of nuclear phase of high-voltage bus power supply in power plant claimed in claim 4, comprises the following steps: 1) Preparatory work for nuclear phase test of high-voltage bus power supply; 2) Close the circuit breaker (2DL) on the high-voltage side of the standby power supply and the circuit breaker (1DL) on the high-voltage side of the working power supply, so that the busbar (2) of the working power supply common box and the busbar (13) of the common box of the standby power supply are charged stably; 3) Detect the voltage, amplitude and phase sequence of the working power incoming voltage transformer (4) and the backup power incoming voltage transformer (11) through the phase meter, and judge the working power incoming voltage transformer (4) and the standby Whether the voltage, amplitude and phase sequence of the power supply incoming line voltage transformer (11) are correct, and judge whether the secondary side measurement value of the working power supply incoming line voltage transformer (4) is consistent with the system rated voltage when the working power supply incoming line voltage transformer ( 4) Whether the theoretical calculation value of the secondary side of the working power supply line voltage transformer (4) is consistent with the secondary side theoretical calculation of the working power supply line voltage transformer (4) when the secondary side measurement value is the same as the system rated voltage When the values are consistent, it means that the wiring of the working power supply unit (1) is correct; judge the measured value of the secondary side of the voltage transformer (11) of the standby power supply line and the secondary side of the voltage transformer (11) of the standby power supply line at the rated voltage of the system. Whether the theoretical calculation value of the backup power input line voltage transformer (11) is consistent with the secondary side theoretical calculation value of the standby power input line voltage transformer (11) at the rated voltage of the system, then It means that the wiring of the standby power supply unit (14) is correct. When the wiring of the standby power supply unit (14) and the wiring of the working power supply unit (1) are correct, it means that the wiring of the secondary circuit is complete and correct, and then go to step 5); otherwise, Go to step 4); 4) When the wiring of the working power supply unit (1) is incorrect, disconnect the circuit breaker (1DL) at the high voltage side of the working power supply; when the wiring of the standby power supply unit (14) is incorrect, disconnect the circuit breaker (2DL) at the high voltage side of the standby power supply, Return to step 2 after finding and eliminating abnormal unit defects); 5) Close the working power inlet switch (5) and the backup power inlet switch (9), so that the working power inlet switch (5), the backup power inlet switch (9), the high-voltage busbar (7), and the working power inlet switch The voltage transformer (4) and the backup power incoming line voltage transformer (11) are electrified; 6) Measuring the secondary side actual voltage of the high-voltage bus voltage transformer (8), the voltage transformer of the working power inlet line (4) and the backup power inlet voltage transformer (11); 7) Determine whether the actual secondary side voltage of the high-voltage bus voltage transformer (8), the working power input line voltage transformer (4) and the backup power input line voltage transformer (11) are consistent with their secondary side voltage theoretically calculated values At the same time, it is judged whether the phase sequence of the high-voltage bus voltage transformer (8), the working power inlet voltage transformer (4) and the backup power inlet voltage transformer (11) are correct phase sequences, so as to complete the mutual induction of the high-voltage bus voltage The homologous nuclear phase of the device (8), the working power incoming line voltage transformer (4) and the backup power incoming line voltage transformer (11), when the high-voltage bus voltage transformer (8), the working power incoming line voltage transformer ( 4) and the homologous phase verification results of the incoming line voltage transformer (11) of the standby power supply are all correct, which means that the incoming line of the working power supply unit (1), the high voltage busbar (7) and the incoming line of the standby power supply unit (14) are correct. If both primary equipment and secondary equipment are normal, go to step 9), otherwise, go to step 8); 8) Disconnect the working power inlet switch (5) and the backup power inlet switch (9), so that the working power inlet switch (5), the backup power inlet switch (9), the high-voltage busbar (7), and the working power supply The line voltage transformer (4) and the backup power incoming line voltage transformer (11) lose power, then find and eliminate the abnormal unit defect and return to step 5); 9) Disconnect the working power inlet switch (5) and the backup power inlet switch (9), restore the soft connection between the working power inlet switch (5) and the working power common box busbar (2), and restore the backup power supply at the same time The soft connection between the incoming switch (9) and the backup power common box busbar (13), then go to step 10); 10) Close the high-voltage side circuit breaker (1DL) of the working power supply and the high-voltage side circuit breaker (2DL) of the standby power supply. Go to step 11 after the box busbar (13) is electrified and stable); 11) Perform a non-homologous phase check on the working power unit (1) and the backup power unit (14), and check whether the polarity of the incoming voltage of the working power unit (1) and the polarity of the incoming voltage of the backup power unit (14) are Consistent, when the polarity of the incoming line voltage of the working power supply unit (1) is consistent with the polarity of the incoming line voltage of the standby power supply unit (14), then go to step 13), otherwise, go to step 12); 12) Disconnect the high-voltage side circuit breaker (1DL) of the working power supply and the high-voltage side circuit breaker (2DL) of the backup power supply, so that the working power supply unit (1) and the backup power supply unit (14) will lose power, and then return after finding and eliminating the abnormal unit defect step 10); 13) The nuclear phase test of the high-voltage bus power supply is over. 6. the method for power plant high-voltage bus power nuclear phase according to claim 5, is characterized in that, the concrete operation process of step 1) is: 101) Install the working power supply unit (1), backup power supply unit (14), backup power common box bus (13), working power common box bus (2), high voltage bus (7) and working power inlet voltage transformer (4 ), backup power input line voltage transformer (11) and primary equipment and secondary equipment within the scope of high-voltage bus voltage transformer (8), make sure that the secondary equipment is connected correctly, the working power input line voltage transformer (4), backup There is no open circuit phenomenon in the secondary circuit of the power supply incoming voltage transformer (11) and the high-voltage bus voltage transformer (8), and the working power incoming voltage transformer (4), the backup power incoming voltage transformer (11) and the high-voltage bus voltage The primary safety connection of the transformer (8) is good, and the secondary circuit breaker of the working power input voltage transformer (4), the backup power input voltage transformer (11) and the high-voltage bus voltage transformer (8) is in the closed state ; 102) The generator is shut down, the generator outlet circuit breaker (GCB) is in the off state, and the working power supply inlet soft connection (3) and the standby power supply inlet soft connection (12) are removed; 103) Perform static commissioning of the busbar quick-cutting device (15), and carry out the transmission experiment of the busbar quick-cutting device (15) with the working power inlet switch (5) and the backup power inlet switch (9); 104) Adjust the opening and closing states of the working power incoming switch (5) and the standby power incoming switch (9) to the opposite state, and switch the working power high-voltage side circuit breaker (1DL) and the standby power high-voltage side circuit breaker (2DL) Adjust to hot standby. 7. The method for phase verification of high-voltage bus power supply in power plant according to claim 5, characterized in that, the specific operation of step 3) is: use a phase meter to measure and record the high-voltage bus voltage transformer (8), working power incoming line The voltage value and phase sequence of each group of voltage transformers in the local terminal box of the voltage transformer (4) and the backup power incoming line voltage transformer (11), judge whether the phase sequence is a positive phase sequence, and determine the voltage value at the same time Whether it is consistent with the normal output voltage value under rated conditions; Check the voltage mutual inductance of each group in the local terminal box of the high-voltage bus voltage transformer (8), the working power inlet voltage transformer (4) and the standby power inlet voltage transformer (11) on the bus quick-cutting device (15). The voltage value and phase sequence of the transformer, and compare it with the voltage value and phase sequence collected by the phase meter respectively, to ensure that the wiring of the working power incoming line voltage transformer (4) and the backup power incoming line voltage transformer (11) is consistent with the The polarity configuration is correct. 8. The method for nuclear phase of high-voltage bus power supply in power plant according to claim 5, characterized in that, in step 7), the working power incoming line switch (5), the working power incoming line voltage transformer (4), the standby power supply The incoming line switch (9), the backup power incoming line voltage transformer (11), the high-voltage busbar (7), and the high-voltage busbar voltage transformer (8) are all in the homologous system, and the homologous system is at the rated voltage. Theoretically, the voltage polarity of the working power incoming line voltage transformer (4), the voltage polarity of the high-voltage bus voltage transformer (8) and the voltage polarity of the backup power incoming line voltage transformer (11) are all the same. When the voltage polarity of one voltage transformer is inconsistent with the other two, then the voltage transformer has wiring or performance problems. At this time, it is necessary to find and eliminate the defects of the abnormal voltage transformer and continue the homologous phase test again; On the screen of the busbar quick-cutting device (15), read the angle difference, pressure difference and frequency difference between the input line voltage of the working power supply and the voltage of the high-voltage busbar (7). When the angle difference, pressure difference and frequency difference are all zero, no processing will be done. Find and eliminate the defects of the abnormal voltage transformer and continue the homologous nuclear phase test again. 9. The method according to claim 5, characterized in that, the specific operation of step 9) is: disconnecting the working power inlet switch (5) and the backup power inlet switch (9) , the backup power common box busbar (13), the working power common box busbar (2), the working power inlet switch (5) and the backup power inlet switch (9) are in the power-off state, then hang the ground wire, and then restore the working power Soft connection between the incoming switch (5) and the working power common box busbar (2), at the same time restore the soft connection between the standby power incoming switch (9) and the standby power common box busbar (13), and then remove the grounding wire , then go to step 10). 10. the method for power plant high-voltage bus power nuclear phase according to claim 5, is characterized in that, step 11) also comprises the following steps: 1101) Check whether the secondary voltage amplitude of the voltage transformer (4) of the incoming line of the working power supply is the rated voltage divided by the transformation ratio of the voltage transformer (4) of the incoming line of the working power supply, whether the phase sequence is positive phase sequence, and whether the zero-sequence voltage is zero; 1102) Check whether the secondary voltage amplitude of the backup power input line voltage transformer (11) is the rated voltage divided by the transformation ratio of the backup power input line voltage transformer (11), whether the phase sequence is positive phase sequence, zero sequence voltage is zero; 1103) Check whether the secondary voltage amplitude of the high-voltage bus voltage transformer (8) is the rated voltage divided by the transformation ratio of the high-voltage bus voltage transformer (8), whether the phase sequence is positive phase sequence, and whether the zero-sequence voltage is zero; 1104) Check whether the secondary voltage frequency difference of the working power incoming line voltage transformer (4), the backup power incoming line voltage transformer (11) and the high-voltage bus voltage transformer (8) is zero, and whether the phase angle difference is less than 3° , whether the voltage difference between the same phases is less than 5V; 1105) Check the secondary voltage frequency difference of the working power inlet voltage transformer (4), the backup power inlet voltage transformer (11) and the high-voltage bus voltage transformer (8) read on the bus quick-cutting device (15) Whether it is zero, whether the phase angle difference is less than 3°, whether the voltage difference between the same phases is less than 5V.