Steps to debug high voltage switchgear

1: Prepare a process inspection record sheet and make inspection records for each step.

2: Assembly and one-time inspection

1) Compare the system diagram and the material list of each cabinet to check whether the components are installed correctly.

2) Check whether the fixing screws of the components are tightened.

3) Check whether one-time production meets the process requirements, whether the safety distance is greater than 125mm, and whether the screws of the connecting row are tightened.

4) Check whether the cabinet door grounding and component grounding are complete and the signs are clear.

5) Check whether the cabinet door lock, ground lock, sliding door baffle is flexible, whether the handcart is flexible in and out, and whether the stroke meets the requirements.

3: Secondary line inspection

1) Check whether the secondary wiring meets the process requirements.

2) Check whether the connecting screws of the secondary line are tightened, especially the screws on the secondary terminal. Check whether the thread nose is tight.

3) Check whether the lines before and after the secondary terminal correspond one to one, and whether the connecting piece and the terminal separator are fixedly installed according to the drawing.

4) Check whether the secondary wiring terminal number corresponds to the drawing one-to-one, especially the secondary external terminal number should correspond to the drawing one-to-one (on-site construction wiring is connected according to the terminal number, if the internal and external lead terminals of the cabinet do not match the drawing, please It will fail to debug on site and affect the company's image).

5) Check whether the label on the meter door corresponds to the drawing.

4: Withstand voltage test

1) Move the vacuum circuit breaker into the working position, and close the circuit breaker.

2) Use a multimeter to measure the current terminal of each connection, and it should be connected to the ground.

3) Short-circuit the three-phase A, B, and C outgoing wires in the cabinet to apply a 10KV voltage, and power off and discharge after the high-voltage charged display indicates normal.

4) Turn off the high-voltage live display or short-circuit the A, B, C and ground wires on the high-voltage live display, apply 42KV high voltage for one minute and there should be no breakdown, then power off and discharge.

5) Disconnect the circuit breaker at the working position, short-circuit the three-phase A, B, and C of the busbar room and ground it. There should be no breakdown at the three-phase fracture of A, B, C when high voltage of 42KV is applied to the outlet side for one minute.

6) After the tested item meets the requirements, discharge, remove the short wiring, restore the high-voltage live display and fill in the test

5: Secondary protection test

1) Operate the opening and closing of the circuit breaker from the instrument door, and check whether the circuit breaker is in corresponding action and whether the indicator lights correspond to each other.

2) Write the corresponding current and voltage ratio coefficients to the comprehensive insurance.

3) Current transformer transformation ratio test: Apply a current of 10A to 20A at a time, and measure whether the transformation ratio of the secondary winding is consistent with the label.

4) Voltage transformer transformation ratio test: Apply a voltage of 380V once, and measure whether the transformation ratio of the secondary winding is consistent with the label.

5) Disconnect the connecting piece of the current terminal, add a current of 3A to 5A to the current terminal on the loop side of the comprehensive protection and ammeter, and check whether the display of the comprehensive protection and ammeter is the corresponding reading.

6) Write the protection current value of the corresponding load to the comprehensive protection, close the circuit breaker, and add the corresponding protection current to the protection circuit of the comprehensive protection to check whether the comprehensive protection is operating at the corresponding current and time value. After confirmation, close the current connection piece.

7) Close the circuit breaker, add corresponding overvoltage and low voltage to the comprehensive protection, and check whether the comprehensive protection is operating at the corresponding voltage value.

8) Close the circuit breaker, give the corresponding non-electricity signal, and check whether the comprehensive protection alarm or action.

9) Check whether the position and status of the circuit breaker correspond to the opening input of the comprehensive insurance.

10) Check whether the external terminal signal of the circuit breaker position and status corresponds to the actual one-to-one.

6: Fill out the items that do not meet the requirements on the commissioning list, and prepare for the next commissioning.

7: After debugging, check the sanitation in the cabinet. Fill in the factory inspection report and product certificate after no problem.