型号: PTG7111       颜色:       重量:

详细介绍：

Protective relays greatly participate in the operation of industrial networks, and help providing the  best possible electrical service. Overcurrent protections are the basic protection used in a network  for feeder protection. They must be both sensitive and fast in order to minimize the stress imposed  on the equipment during the fault (electro dynamic and thermal stresses).  They should also be selective, i.e. to be able of eliminate only the faulty element while maintaining  the supply of the healthy parts. For feeder protection, relays with a two-level definite, or inverse,  time characteristic for phase faults and a single level for earth faults operate according to this  principle.