electrical power panel

The electrical commissioning of the distribution cabinet is an important part to ensure its normal operation and safety, which mainly includes the following contents:

1. Electrical operation experiment
   On the premise that the installation and wiring are correct, simulated action test is carried out according to the electrical schematic diagram, that is, power-on test. This link mainly includes the following aspects:

Circuit breaker closing and opening test: Check whether the circuit breaker can close and open normally to ensure that its switch function in the electrical system is normal.
Button operation and related indicator light test: Test whether the various button operations on the distribution cabinet are flexible and reliable, and whether the relevant indicator lights can correctly display the status of the electrical system.
Manual switching test: For distribution cabinets with manual switching function, manual switching test is required to verify the accuracy and reliability of its switching action.

factory general control box

2. Interlocking function test
   Power on to check the interlocking of the operating mechanism and the door, the interlocking of the drawer and the door, etc., to ensure that the safety of personnel and equipment is guaranteed when the electrical system is running. This link mainly includes:

Interlocking test of the operating mechanism and the door: When the distribution cabinet is closed (powered on), the door should not be opened. The door can only be opened after the switch is disconnected. This can prevent accidents caused by misoperation when the electrical system is running.
Interlocking test between drawers and doors: For drawer-type distribution cabinets, an interlocking test between drawers and doors is required. Ensure that the door cannot be opened when the drawer is not fully pushed in or not fully disconnected.
Interlocking test between dual power supplies: In a distribution system with dual power supplies, an interlocking test between dual power supplies is required. Ensure that when the normal power supply is normal, the circuit breaker of the backup power supply cannot be closed; when the main power supply is cut off, the backup power supply can automatically complete the mutual transfer to ensure the continuous power supply of the power system.

3. Insulation resistance test
   Insulation resistance test is essential to ensure the safety of operators, cabinets, and components in the cabinet. The main measurement parts include:

When the main switch of the switch cabinet is in the disconnected position: measure the insulation resistance between the incoming and outgoing lines of the same pole.
When the main switch is closed: measure the insulation resistance between live parts of different poles.
Between the main circuit and the control circuit: Measure the insulation resistance between the main circuit and the control circuit to ensure that there is no electrical short circuit between them.
Between each live component and the metal frame of the cabinet: Measure the insulation resistance between each live component and the metal frame of the cabinet to prevent electric shock accidents.