The correct way to open and close the circuit breaker

1. Closing sequence: firstly combine the secondary protection of the power side switch, and then the power side switch. After checking the error, re-load the load switch secondary insurance, and then load the side switch. After confirming the error, the closing operation ends.

2. Opening operation: first open the load switch, then pull off the secondary insurance of the load side switch. After confirming the error, pull the power side switch again, then pull off the secondary protection of the power side switch. After the check is correct, the operation ends. .

There are a few points to note here:

1. Whether it is closing or opening, it should be sideways during operation. Do not face the device face to avoid injury to the person in the event of an accident.

2. Before power transmission, check whether there is short circuit or grounding in the circuit of power transmission, otherwise it will not be able to send power.

3. If there is a knife gate in the circuit, the knife switch and the rear switch should be combined before power transmission. The switch should be divided before opening. After the knife gate.

4. These operations should have a guardian present. The operator should wear gloves.

5. After closing and after opening. All should be inspected, and if necessary, the closing should be confirmed whether there is a lack of phase.

The above is the most basic requirement for power transmission.

When opening, you should make the following actions in order:

Check the condition of the secondary device and the protection device. If there is a situation where the main circuit and the secondary circuit are connected in parallel, the power of the main circuit should be disconnected first, and then the power of the secondary circuit should be disconnected.

Check the opening position. Knob type switch, the opening position is generally in the middle, but it is also different. Regardless of any switch, it is necessary to check clearly where the trip should be taken before opening.

Disconnect the load and disconnect each branch switch when breaking the upper level switch. When breaking the branch gate, the high-power electrical appliance in the loop should also be stopped.

When closing, the following actions should be made in order:

Detect circuit faults and find out the cause of the trip. If the circuit breaker automatically trips, be sure to confirm to the maintenance worker that the circuit fault has been eliminated. If it is manually disconnected, be sure to find out the reason for the opening, and do not open the door privately, so as not to cause damage to the personnel who are repairing the circuit.

Determine the power supply of the secondary device and the protection device. When closing, the secondary circuit and the protection circuit should be powered first.

When the grading is closed and closed, the upper circuit breaker should be closed first to reduce the load when closing. Then turn down step by step.