Relay protection of 20kV and above voltage levels and related equipment, networks, etc. shall be configured according to the principle of dualization. The relay protection of dual configuration shall comply with the following requirements:
(1) Each complete, independent protective device shall be capable of handling all types of faults that may occur. There should be no electrical connection between the two sets of protection and should not affect the operation of the other set of protection when it is abnormal or withdrawn.
(2) The two sets of protected voltage (current) sampling values ​​shall be taken separately from the merging units that are independent of each other.
(3) The binning unit shall be corresponding to two independent subsampling systems of electronic transformers .
(4) The GOOSE (SV) network used for protection of dual configuration should follow the principle of independence. When a network is abnormal or exits, the GOOSE network should not affect the operation of another network.
(5) The two sets of protection trip circuits should correspond to two intelligent terminals respectively; two intelligent terminals should correspond to the two trip coils of the circuit breaker respectively.
(6) Dual line protection should be configured with two sets of single-arm communication equipment (including multiplexed fiber channel, independent core, microwave, carrier and other channels and processing equipment, etc.), the two sets of communication equipment should be used separately power supply.
(7) The two sets of DC power supplies for protection and related equipment (electronic transformers, merging units, smart terminals, network equipment, trip coils, etc.) shall be one-to-one correspondence.
(8) protection of dual configuration should use the main, after the integration of protective devices.
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