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(1) a DC screen and a rectifying DC power supply device and its DC circuit should be cleaned by two people. One of them should strengthen the custody of the work to prevent injury or damage to the equipment.

(2) in the process of cleaning and inspection, if we need to further check or handle defects in some of the components in operation, we must comply with the relevant provisions of the 164th part and 4 chapter of the electrical safety work regulations (the electrical part of power plants and substations). If a component in a DC circuit is replaced, measures should be taken to prevent DC load from interrupting power supply.

(3) in the case of cleaning, checking or handling defects, the DC system has broken down. It should stop work immediately, keep the original shape, and find out the reason.

(4) where for DC screen and circuit breaker electromagnetic power rectifier DC device power supply stop mechanism closing maintenance, inspection or processing defects, should be the automatic reclosing device for switching power supply circuit breaker will be out of the operation, when the rectifier DC power supply device, the completion of the work of recovery after the operation, and then automatic reclosing device is put into operation.