Photovoltaic power plant system equipment

What are the requirements for operation and maintenance of relay protection?

What are the requirements for operation and maintenance of relay protection?

1. Requirements for operators
(1) Familiar with the basic principles and main structures of protection.

(2) Familiar with the configuration and scope of protection.

(3) It can correctly throw and withdraw the protection soft and hard connection pieces, and the whole group of protection devices can be put into operation or stopped, and a simple man-machine dialogue can be carried out.

(4) Be able to monitor and inspect the protection normally according to regulations, and be able to understand the information report.

(5) It can supervise, accept and transmit the operation and safety measures on the protection and circuit.

(6) The input and exit of the relay protection and the action in the event of an accident, as well as the abnormality and alarm phenomenon issued by the protection device itself should be recorded in detail.

(7) Work on the protection and secondary circuits must have a work ticket, and the work permit system should be implemented. The operator must review the work ticket and its safety measures.

(8) After the relay protection work is completed, the on-duty personnel should carry out the following inspections:
1) Whether all the temporary wires in the work are removed, and whether all the disconnected wire connectors are restored.
2) Whether the name of the protective connecting piece, the position of throwing and withdrawing are correct, and whether the contact is good.
3) Whether the indication of each signal lamp and indicator light is correct.
4) Whether the protection setting is correct.
5) Whether the changed wiring is explained in writing, and whether the inspection items and test reports are complete and correct.
6) Cooperative protection personnel have switch linkage test, and the action is reliable and the signal is correct.
7) Check that the secondary side and terminals of the voltage transformer and current transformer are free of short-circuit and open-circuit.

What are the requirements for operation and maintenance of relay protection?
operation and maintenance of relay protection

2. Precautions for operation and maintenance
(1) Any equipment running with electricity is not allowed to run without protection.

(2) When the primary equipment is powered off, the protection device and the secondary circuit are not working, the protection device can not be disabled, but the tripping outlet connection piece of other operating circuit breakers should be released.

(3) The input and deactivation of relay protection and automatic devices can only be carried out after the order or consent of the station master; the equipment involved in the main protection and dispatching jurisdiction must be applied to dispatching, and can only be carried out after obtaining dispatching consent.

(4) When there is an abnormality in the relay protection or automatic device, which may cause a malfunction and must be dealt with immediately, the on-site duty personnel can deal with it first, and then report to the dispatcher.

(5) The setting change of relay protection and automatic device (including the transformation ratio of current transformer) should be carried out according to the protection fixed value notice, and the relevant leaders should check with the on-site personnel after the execution.

(6) Before the protection device is tripped, the operator must check that the signal indication is normal (including high-frequency protection channel, differential protection differential current or differential voltage, etc.) The method of measuring the voltage verifies that the protection device does not give a tripping or closing pulse.

(7) Before the new (modified, expanded) equipment is put into operation and after the relay protection setting value of the field operation equipment is changed, the on-site relay protection work record and setting value should be checked with the dispatcher, and the equipment can be put into the system only after the verification is correct. Operation; newly installed or the directional protection and differential protection of the primary and secondary circuits have changed, the phase measurement must be carried out under the load state (such as making a directional hexagon diagram, measuring the differential voltage or differential current of the differential protection).

(8) The order of putting in the protection device is: first put in the DC power supply, and then put in the outlet connecting piece; the order of deactivating the protection device is the opposite.

(9) When one of the following situations occurs, the corresponding protective device should be taken out of operation:
1) The protection setting needs to be changed during operation.
2) The protection circuit has maintenance work.
3) The voltage transformer is out of operation for some reason.
4) The protection device itself is faulty and cannot operate normally.

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