How to test the five anti-misoperation functions of high-voltage switchgear

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The five anti-misoperation functions refer to preventing the circuit breaker from being opened or closed by mistake; preventing the disconnector from being opened or closed with load; preventing the grounding wire from being connected or the grounding switch from being closed when the equipment is energized; preventing the circuit breaker from being closed when the grounding wire is connected or the grounding switch is closed; preventing people from entering the energized compartment by mistake. The following are the specific methods for testing the five anti-misoperation functions of high-voltage switchgear:

### Test for Preventing the Circuit Breaker from Being Opened or Closed by Mistake

- **Test Steps**: Set the circuit breaker of the high-voltage switchgear in the closed position and check the position indication of the circuit breaker on the monitoring system or the operation panel. Then, under normal operating conditions, simulate a misoperation by pressing the opening button and observe whether the circuit breaker will be opened by mistake. Similarly, set the circuit breaker in the open position and simulate a misoperation by pressing the closing button and observe whether it will be closed by mistake.

- **Qualification Criteria**: When the equipment is in normal operation and no correct operation instruction is issued, the circuit breaker should not have any misopening or misclosing actions. ### Test for Preventing the Disconnector from Being Opened or Closed with Load

- **Test Steps**: First, make the load connected to the high-voltage switchgear in the running state, that is, the circuit breaker is in the closed position and there is current flowing through. At this time, try to operate the disconnector to open or close it and observe whether the disconnector can be operated.

- **Qualification Criteria**: The disconnector should be equipped with mechanical or electrical interlocking devices. It should be impossible to perform the opening or closing operations under load conditions, and corresponding alarm signals should be sent out.

### Test for Preventing the Grounding Wire from Being Connected or the Grounding Switch from Being Closed When the Equipment Is Energized

- **Test Steps**: Close the circuit breaker of the high-voltage switchgear to make the equipment in an energized state. Then, simulate the operation of the operator to connect the grounding wire or close the grounding switch without shutting down the power, and observe whether the operation can be carried out.

- **Qualification Criteria**: When the equipment is energized, it should be impossible to connect the grounding wire or close the grounding switch. Meanwhile, the system should send out an alarm to indicate that the equipment is energized and prohibit this operation.

### Test for Preventing the Circuit Breaker from Being Closed When the Grounding Wire Is Connected or the Grounding Switch Is Closed

- **Test Steps**: When the grounding switch of the high-voltage switchgear is in the closed state or the grounding wire has been properly connected, try to operate the circuit breaker to close it and observe whether the circuit breaker can be closed.

- **Qualification Criteria**: The circuit breaker should not be able to be closed, and there should be corresponding locking and alarm prompts to prevent the misoperation of closing the circuit breaker when the grounding wire is connected or the grounding switch is closed.

### Test for Preventing People from Entering the Energized Compartment by Mistake - **Test Steps**: Select an energized compartment of the high-voltage switchgear, close the cabinet door and ensure that it is in a normal running and energized state. Then, simulate the operation of the operator trying to open the cabinet door of the energized compartment without taking any safety measures and observe whether the cabinet door can be opened.

- **Qualification Criteria**: The cabinet door of the energized compartment should not be able to be opened, and there may be measures such as door lock locking and alarm prompts to prevent people from entering the energized compartment by mistake.