... Hz ac voltage switch equipment, used in outdoor voltage 10 ~ 110 KV power system, have no ... following varieties: 1) according to whether grounding switch points: no grounding, single grounding (left ... grounding) and double grounding; 2) grounding switch according to withstand short-circuit current ability and ... Hz ac voltage switch equipment, used in outdoor voltage 10 ~ 110 KV power system, have no ...