What are the five electrical precautions?

1, to prevent on-load disconnector. (The disconnector cannot be operated when the circuit breaker, load switch and contactor are closed. )

2, to prevent the wrong points, wrong circuit breaker, load switch, contactor. (Only when the operation instruction corresponds to the operating equipment can the operated equipment be operated.)

3. Prevent the grounding switch from closing the circuit breaker and load switch in the closed position. (Only when the grounding switch is off, the disconnector or handcart can be closed to the working position, and the circuit breaker and load switch can be closed.

4, to prevent the wrong grounding switch when charged. (Only when the circuit breaker is disconnected, can you operate the isolating switch or the handcart retreat from the working position to the test position and close the grounding switch. )

5, to prevent the wrong charged interval. Only when the car is not electrified can you open the door and enter the car. The "five precautions" in the power distribution room are fire prevention, waterproof, lightning protection, snow prevention and small animals prevention. "One ventilation" means good ventilation.

The working principle of the extended data five-prevention system is that the preview operation is simulated on the error-proof host, and the error-proof host makes locking logic judgment on each simulated operation according to the pre-stored error-proof locking logic library and the current equipment position state, and generates the actual operating program with correct simulated operation content and transmits it to the computer key.

According to the operation content displayed by the computer key, the operator opens the corresponding password lock in turn to operate the equipment. After all operations are completed, the state of the equipment is consistent with that of the field equipment by returning the computer key.

In addition, the five-prevention system has no prompt function for equipment displacement, and relies entirely on background monitoring signals. If the operator is careless or the monitoring is not in place, the background displacement signal will be missed, especially in the process of maintenance, planned maintenance or large-scale operation, where the background signals are frequent and numerous, and the displacement signal mistakenly sent by the equipment is often mixed with other signals, which is difficult to find at this time.

During the shift change, the handover personnel may be busy or negligent, and the position and state of the equipment are not clearly explained. Once these situations happen, it may cause misoperation accidents, and the consequences are unimaginable.

Operation process:

1. Strictly implement the steps of "singing tickets-repeating-operating-returning documents". When repeating, the operator must point to the equipment name signboard. After the guardian confirms that the signboard is consistent with the re-reading content, the guardian clicks "Correct! Execute! " After placing an order, the operator can operate. After the operation, the operator replies "Operation finished!" ;

2. After hearing the operator's reply, the guardian will tick "√" in the execution column, and then add "/"to "after the guardian checks and confirms, thus completing a" √ ";

3. If there is any doubt or abnormality, stop the operation immediately and report to the person in charge on duty to find out the reason. After the doubt or abnormality is eliminated, the operation can be continued;

4. If the operation is interrupted, before the operation is resumed, the first operation task should be rechecked, and one item should be rechecked, and another "√" should be put in the "execution column" of the operation ticket;

5. The operation of accepting power grid dispatching orders should be clear in six aspects: clear acceptance of orders, clear arrangement of operation tasks, clear operation contact, clear report after operation and clear handover records.

References:

Baidu Encyclopedia-Five Electrical Protection