A method for automatically switching the 400V power supply T-connector switch of a hydropower station

Abstract

A method for automatically switching a 400V plant power T-connection switch of a hydropower station includes the steps of switching a 400V plant power busbar from a main power supply to a T-connection switch, and switching the 400V plant power busbar from a T-connection switch to a main power supply. The method makes full use of program condition execution judgment and scientific and reasonable processes to execute the main power supply circuit breaker, bus tie switch, T-connection switch and other equipment operations in the process of the 400V plant power busbar being stopped first and then sent by the T-connection switch, which not only shortens the operation time and reduces the intensity of the operator, but also ensures that the entire operation process is accurate and correct, which helps to improve the safety production management level of the power plant.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower power systems, in particular to a method for automatically switching a 400V plant power T-connector switch of a hydropower station. Background Art

[0002] The power supply system of a power plant is a combination of electrical equipment that distributes electric energy to power loads to ensure the normal operation of the generator during the start-up, operation, shutdown, and maintenance processes. The 400V voltage level line is mainly used for low-voltage electric loads and power distribution for power supply for power supply. During the bus maintenance period, when the bus main power supply transformer and the corresponding upper power supply (10KV switch) of the main power supply transformer fail, and when the 400V bus bus tie switch fails, it is necessary to shut down the power supply for maintenance and switch it. At present, the operation of switching the 400V bus T-connected switch from standby to operation and from operation to standby is manually performed by the operating personnel, with many operating steps, and there are many operation locks and precautions. In particular, when the switching operation sequence of the bus from the main power supply to the standby power supply is incorrect and the equipment operation lock fails, it may cause asynchronous operation of the power supply system or damage to the equipment, which will bring hidden dangers to the safe and stable operation of the power station and is not conducive to safe production. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above-mentioned background technology, and to provide a method for automatic switching of the 400V plant power T-connected switch of a hydropower station, which makes full use of program condition execution judgment and scientific and reasonable processes to execute the main power supply circuit breaker, bus tie switch, T-connected switch and other equipment operations in the process of the 400V plant power busbar being stopped first and then sent by the T-connected switch. It not only shortens the operation time and reduces the intensity of the operator, but also ensures that the entire operation process is accurate, which helps to improve the safety production management level of the power plant.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for automatic switching of a 400V plant power T-connection switch of a hydropower station, comprising the steps of switching the 400V plant power busbar from the main power supply to the T-connection switch, and switching the 400V plant power busbar from the T-connection switch to the main power supply; wherein, the step of switching the 400V plant power busbar from the main power supply to the T-connection switch is:

[0005] S10. When the operation process starts, the main power supply is determined to switch the power supply condition to the T-switch; if it is satisfied, the operation process proceeds to the next step; if not, the alarm is issued and the operation process is exited;

[0006] S11. Issue a command to move the T-connector switch to the "working" position; if the conditions are not met, the operation fails and an alarm is given to exit the operation process; if the conditions are met, proceed to the next step;

[0007] S12. Issue an order to exit the 400V busbar standby automatic switching device to be powered off; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If the conditions are met, proceed to the next step;

[0008] S13. Issue an order to disconnect the main power switch of the 400V busbar incoming line; if not met, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step;

[0009] S14. Issue an order to close the T-connected power switch on the charging side of the 400V busbar; if not met, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0010] S15. Issue an order to close the T-connected power switch on the load side of the 400V busbar;

[0011] The steps for the 400V auxiliary power busbar to be powered by the main power supply from the T-connected switch are as follows:

[0012] S20. When the operation process starts, the T-connected switch is judged to switch the power supply to the main power supply condition; if it is satisfied, the operation process proceeds to the next step, if not, the alarm is issued and the operation process is exited;

[0013] S21. Issue an order to turn the 400V factory power bus main power switch to the "working" position and close the switch; if not, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0014] S22. Issue an order to disconnect the T-switch on the load side of the 400V bus, close the 400V bus main power switch, and disconnect the T-switch on the power supply side of the 400V bus; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step;

[0015] S23. Move the T-switch to the "test" position to open the gate; if not, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0016] S24. Move the bus tie switch to the "working" position to open the switch, and switch the busbar backup automatic switching device mode to the "full automatic" mode.

[0017] In S10, the conditions for switching from the main power supply to the T-type switch are judged, including: all T-type switch conditions are met, all main power supply switch conditions are met, all bus tie switch conditions are met, there are no faults in the protection and automation devices, and the busbar standby automatic switching exit and / or standby automatic switching device conditions are all met. Subsequent operations can only be performed when all the above conditions are met.

[0018] In S12, the specific steps are as follows: after issuing an order to exit the standby automatic re-entry device of the 400V bus to be powered off, detecting that the standby automatic re-entry device of the 400V bus is in the "exit" state, and swinging the bus tie switch to the "test" position.

[0019] In S13, after issuing an order to disconnect the main power switch of the 400V bus incoming line, the 400V bus voltage is detected to be 0V.

[0020] In S14, the specific steps are as follows: after issuing an order to close the T-connected power switch on the 400V bus charging side, check whether the three-phase voltage of the 400V bus charging is normal.

[0021] In S15, the specific steps are as follows: after issuing an order to close the T-connected power switch on the load side of the 400V bus, detecting whether the three-phase voltage of the two sections of the 400V bus connected to the T-connected switch is normal.

[0022] In S20, the conditions for switching the power supply from the T-connected switch to the main power supply are judged, including: all T-connected switch conditions are met, all main power supply switch conditions are met, all bus tie switch conditions are met, there are no faults in the protection and automation devices, the bus standby automatic transfer exit and / or the standby automatic transfer device conditions are all met, and the corresponding 10kV bus voltage is normal. Subsequent operations can only be performed when all the above conditions are met.

[0023] In S22, the specific steps are to issue an order to disconnect the T-connected switch on the load side of the 400V bus and close the bus main power switch, check that the bus main power supply is normal, and disconnect the T-connected switch on the power supply side of the 400V bus.

[0024] In S23, the specific steps are to swing the T-type switch to the "test" position to open the switch, and hang the "asynchronous" sign. This step is coordinated with the on-site operation.

[0025] In S24, the specific steps are to swing the bus tie switch to the "working" position, check whether the bus tie switch is in the open state, and switch the busbar backup automatic switching device mode to the "full automatic" mode. This step is coordinated with the on-site operation.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention provides a method for automatic switching of a 400V plant power T-connected switch in a hydropower station. The method makes full use of program condition execution judgment and scientific and reasonable processes to execute the main power supply circuit breaker, bus tie switch, T-connected switch and other equipment operations in the process of the 400V plant power busbar being stopped first and then sent by the T-connected switch. It not only shortens the operation time and reduces the intensity of the operator, but also ensures that the entire operation process is accurate and correct, which helps to improve the safety production management level of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 This is the logic diagram of the present invention for switching the 400V factory power bus from the main power supply to the T-switch power supply.

[0030] Figure 2 The present invention is a logic diagram for switching the 400V factory power bus from a T-connected switch to a main power supply.

[0031] Figure 3 This is a logic diagram for judging the power supply condition of the main power supply switching T-type switch of the present invention.

[0032] Figure 4 This is a logic diagram for judging the power supply condition of the T-connected switch switching to the main power supply in the present invention. DETAILED DESCRIPTION

[0033] like Figure 1-4 As shown, a method for automatic switching of a 400V auxiliary power T-connection switch of a hydropower station includes the steps of switching the 400V auxiliary power busbar from the main power supply to the T-connection switch, and switching the 400V auxiliary power busbar from the T-connection switch to the main power supply; wherein the step of switching the 400V auxiliary power busbar from the main power supply to the T-connection switch is:

[0034] S10. When the operation process starts, the main power supply is determined to switch the power supply condition to the T-switch; if it is satisfied, the operation process proceeds to the next step; if not, the alarm is issued and the operation process is exited;

[0035] S11. Issue a command to move the T-connector switch to the "working" position; if the conditions are not met, the operation fails and an alarm is given to exit the operation process; if the conditions are met, proceed to the next step;

[0036] S12. Issue an order to exit the 400V busbar standby automatic switching device to be powered off; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If the conditions are met, proceed to the next step;

[0037] S13. Issue an order to disconnect the main power switch of the 400V busbar incoming line; if not met, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step;

[0038] S14. Issue an order to close the T-connected power switch on the charging side of the 400V busbar; if not met, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0039] S15. Issue an order to close the T-connected power switch on the load side of the 400V busbar;

[0040] The steps for the 400V auxiliary power busbar to be powered by the main power supply from the T-connected switch are as follows:

[0041] S20. When the operation process starts, the T-connected switch is judged to switch the power supply to the main power supply condition; if it is satisfied, the operation process proceeds to the next step, if not, the alarm is issued and the operation process is exited;

[0042] S21. Issue an order to turn the 400V factory power bus main power switch to the "working" position and close the switch; if not, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0043] S22. Issue an order to disconnect the T-switch on the load side of the 400V bus, close the 400V bus main power switch, and disconnect the T-switch on the power supply side of the 400V bus; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step;

[0044] S23. Move the T-switch to the "test" position to open the gate; if not, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step;

[0045] S24. Move the bus tie switch to the "working" position to open the switch, and switch the busbar backup automatic switching device mode to the "full automatic" mode.

[0046] See also Figure 3 In the figure, "&" represents logical AND, and "≥1" represents at least one condition is satisfied. In S10, judging the conditions for switching from the main power supply to the T-connection switch includes: all T-connection switch conditions are satisfied, all main power supply switch conditions are satisfied, all bus tie switch conditions are satisfied, there is no fault in the protection and automation device, and all bus standby automatic switching exit and / or standby automatic switching device conditions are satisfied. Among them, the T-connected switch conditions include the opening of the T-connected switch, the test position of the T-connected switch trolley, the remote control of the T-connected switch, the spring energy storage of the T-connected switch and the disconnection of the control circuit of the T-connected switch; the main power supply switch conditions include the closing of the main power supply switch, the working position of the main power supply switch trolley, the remote control of the main power supply switch, the spring energy storage of the main power supply switch and the disconnection of the control circuit of the main power supply switch; the bus tie switch conditions include the opening position of the bus tie switch trolley, the working position of the bus tie switch trolley, the remote control of the bus tie switch, the spring energy storage of the bus tie switch and the disconnection of the control circuit of the bus tie switch; the standby automatic throw device conditions include the full-automatic mode of the standby automatic throw device, the semi-automatic mode of the standby automatic throw device, the remote control of the standby automatic throw device and the failure of the standby automatic throw device.

[0047] In S12, the specific steps are as follows: after issuing an order to exit the standby automatic re-entry device of the 400V bus to be powered off, detecting that the standby automatic re-entry device of the 400V bus is in the "exit" state, and swinging the bus tie switch to the "test" position.

[0048] In S13, after issuing an order to disconnect the main power switch of the 400V bus incoming line, the 400V bus voltage is detected to be 0V.

[0049] In S14, the specific steps are as follows: after issuing an order to close the T-connected power switch on the 400V bus charging side, check whether the three-phase voltage of the 400V bus charging is normal.

[0050] In S15, the specific steps are as follows: after issuing an order to close the T-connected power switch on the load side of the 400V bus, detecting whether the three-phase voltage of the two sections of the 400V bus connected to the T-connected switch is normal.

[0051] See also Figure 4 In the figure, "&" represents logical AND, and "≥1" represents at least one condition is satisfied. In S20, the conditions for switching from T-connection switch power supply to main power supply power supply are judged to include: all T-connection switch conditions are satisfied, all main power supply switch conditions are satisfied, all bus tie switch conditions are satisfied, protection and automation devices are fault-free, bus standby automatic switching is exited and / or standby automatic switching device conditions are satisfied, and the corresponding 10kV bus voltage is normal. Among them, T-connection switch conditions include T-connection switch closing, T-connection switch trolley working position, T-connection switch remote control, T-connection switch spring energy storage and T-connection switch control circuit disconnection; main power supply switch conditions include main power supply switch opening, main power supply switch trolley test position, main power supply switch remote control, main power supply switch spring energy storage and main power supply switch control circuit disconnection; bus tie switch conditions include bus tie switch trolley opening position, bus tie switch trolley test position, bus tie switch remote control, bus tie switch spring energy storage and bus tie switch control circuit disconnection; standby automatic device conditions include standby automatic device full automatic mode, standby automatic device semi-automatic mode, standby automatic device remote control and standby automatic device failure. Subsequent operations can only be performed when all the above conditions are met.

[0052] In S22, the specific steps are to issue an order to disconnect the T-connected switch on the load side of the 400V bus and close the bus main power switch, check that the bus main power supply is normal, and disconnect the T-connected switch on the power supply side of the 400V bus.

[0053] In S23, the specific steps are to swing the T-type switch to the "test" position to open the switch, and hang the "asynchronous" sign. This step is coordinated with the on-site operation.

[0054] In S24, the specific steps are to swing the bus tie switch to the "working" position, check whether the bus tie switch is in the open state, and switch the busbar backup automatic switching device mode to the "full automatic" mode. This step is coordinated with the on-site operation.

[0055] The process of automatic switching of the 400V power supply T-connector is designed as a two-stage process with a sequence. The second stage process is blocked by the first stage process. The latter stage process can only be started after the previous stage process is completed.

[0056] The automatic operation process of the process monitoring system for automatic switching of a 400V plant power T-connector switch of the present invention converts the operation performed entirely by operators into an automatic operation process, thereby avoiding asynchronous plant power system or equipment damage caused by equipment locking failure, and can ensure that the entire operation process is accurate, thereby ensuring the safe and stable operation of the power station.

Claims

1. A method for automatic switching of a 400V power T-connector switch in a hydropower station, characterized in that: The method comprises the steps of switching the 400V auxiliary power busbar from the main power supply to the T-connection switch, and switching the 400V auxiliary power busbar from the T-connection switch to the main power supply; The steps for switching the 400V auxiliary power bus from the main power supply to the T-switch power supply are as follows: S10. When the operation process starts, the main power supply is determined to switch the power supply condition to the T-switch; if it is satisfied, the operation process proceeds to the next step; if not, the alarm is issued and the operation process is exited; S11. Issue an order to move the T-connector switch to the "working" position; if the conditions are not met, the operation fails and an alarm is given to exit the operation process. If the conditions are met, proceed to the next step; S12. Issue an order to exit the 400V busbar standby automatic switching device to be powered off; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If the conditions are met, proceed to the next step; S13. Issue an order to disconnect the main power switch of the 400V busbar incoming line; if not met, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step; S14. Issue an order to close the T-connected power switch on the charging side of the 400V busbar; if not met, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step; S15. Issue an order to close the T-connected power switch on the load side of the 400V busbar; The steps to switch the 400V plant power bus from T-connected switch to main power supply are: S20. When the operation process starts, the T-connected switch is judged to switch the power supply to the main power supply condition; if it is satisfied, the operation process proceeds to the next step, if not, the alarm is issued and the operation process is exited; S21. Issue an order to turn the 400V factory power bus main power switch to the "working" position and close the switch; if not satisfied, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step; S22. Issue an order to disconnect the T-switch on the load side of the 400V bus, close the 400V bus main power switch, and disconnect the T-switch on the power supply side of the 400V bus; if not satisfied, the operation fails and an alarm is issued to exit the operation process. If all conditions are met, proceed to the next step; S23. Move the T-switch to the "test" position to open the gate; if not satisfied, the operation fails and an alarm is given to exit the operation process. If all conditions are met, proceed to the next step; S24. Move the bus tie switch to the "working" position to open the circuit breaker, and switch the busbar backup automatic switching device mode to the "full automatic" mode.

2. A method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1, characterized in that: In S10, the conditions for switching from the main power supply to the T-type switch are judged, including: all T-type switch conditions are met, all main power supply switch conditions are met, all bus tie switch conditions are met, there are no faults in the protection and automation devices, and the busbar standby automatic switching exit and / or standby automatic switching device conditions are all met. Subsequent operations can only be performed when all the above conditions are met.

3. The method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1 is characterized in that: In S12, the specific steps are as follows: after issuing an order to exit the backup automatic re-entry device of the 400V bus to be powered off, detecting that the 400V bus backup automatic re-entry device is in the "exit" state, and swinging the bus tie switch to the "test" position.

4. The method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1 is characterized in that: In S13, after issuing an order to disconnect the main power switch of the 400V bus incoming line, the 400V bus voltage is detected to be 0V.

5. The method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1 is characterized in that: In S14, the specific steps are as follows: after issuing an order to close the T-connected power switch on the 400V bus charging side, check whether the three-phase voltage of the 400V bus charging is normal.

6. A method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1, characterized in that: In S15, the specific steps are as follows: after issuing an order to close the T-connected power switch on the load side of the 400V bus, detecting whether the three-phase voltage of the two sections of the 400V bus connected to the T-connected switch is normal.

7. A method for automatic switching of a 400V power T-connector switch for a hydropower station according to claim 1, characterized in that: In S20, the conditions for switching the power supply from the T-connected switch to the main power supply are judged to include: all T-connected switch conditions are met, all main power supply switch conditions are met, all bus tie switch conditions are met, there are no faults in the protection and automation devices, the bus standby automatic transfer exit and / or the standby automatic transfer device conditions are all met, and the corresponding 10kV bus voltage is normal. Subsequent operations can only be performed when all the above conditions are met.

8. The method for automatic switching of a 400V power T-connector of a hydropower station according to claim 1 is characterized in that: In S22, the specific steps are to issue an order to disconnect the T-connected switch on the load side of the 400V bus, and close the bus main power switch, check that the bus main power supply is normal, and disconnect the T-connected switch on the power supply side of the 400V bus.

9. A method for automatic switching of a 400V power T-connector switch for a hydropower station according to claim 1, characterized in that: In S23, the specific steps are to swing the T-type switch to the "test" position to open the switch, and hang the "asynchronous" sign. This step is coordinated with the on-site operation.

10. A method for automatic switching of a 400V power T-connector switch for a hydropower station according to claim 1, characterized in that: In S24, the specific steps are to swing the bus tie switch to the "working" position, check whether the bus tie switch is in the open state, and switch the busbar backup automatic switching device mode to the "full automatic" mode. This step is coordinated with the on-site operation.

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