The parts that need to be protected in the DC system have the following requirements:
(1) Protective circuit should be installed in the battery outlet circuit, DC side outlet circuit of charging device, DC feeder circuit and battery test discharge circuit.
(2) Protective appliances use DC circuit breakers or fuses.
(3) When DC breakers and fuse cascades are used as protective devices, the following fits should be used.
1) When the fuse is installed on the DC circuit breaker, the rated current of the fuse should be 2 times or more of the rated current of the DC breaker.
2) When the DC circuit breaker is installed on the upper stage of the fuse, the rated current of the DC circuit breaker should be 4 times or more of the rated current of the fuse.
(4) The configuration of the protection devices at all levels shall be based on the calculation results of the short-circuit current to ensure reliability, selectivity, sensitivity and quickness.
(5) Protection devices at all levels can be used for instantaneous current quick-break, short-delay current fast-break and inverse-time over-current protection.
(1) Protective circuit should be installed in the battery outlet circuit, DC side outlet circuit of charging device, DC feeder circuit and battery test discharge circuit.
(2) Protective appliances use DC circuit breakers or fuses.
(3) When DC breakers and fuse cascades are used as protective devices, the following fits should be used.
1) When the fuse is installed on the DC circuit breaker, the rated current of the fuse should be 2 times or more of the rated current of the DC breaker.
2) When the DC circuit breaker is installed on the upper stage of the fuse, the rated current of the DC circuit breaker should be 4 times or more of the rated current of the fuse.
(4) The configuration of the protection devices at all levels shall be based on the calculation results of the short-circuit current to ensure reliability, selectivity, sensitivity and quickness.
(5) Protection devices at all levels can be used for instantaneous current quick-break, short-delay current fast-break and inverse-time over-current protection.
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