110kV, 220kV power network is a major voltage levels, due to the high voltage neutral point directly to ground general way, since the relay setting configuration and prevent communication interference and other requirements, in order to limit single-phase short-circuit current, some of which transformers ungrounded way. In this operating mode, due to lightning, single-phase ground short circuit failure will result in neutral overvoltage, and most of the graded insulation transformer, thus posing a great threat to the over-voltage insulated neutral point, the need to protect its settings devices to prevent accidents. GEDQ-ZCB-110/220 series transformer neutral equipment is in strict accordance with DL / T620-1997 "over-voltage protection and insulation coordination for AC electrical installations" on the 110kV / 220 kV power grid effectively grounded transformer neutral point adopting gap Manufacturing protection regulations, and in accordance GB311.1-1997 "insulation with high-voltage power transmission equipment" and the State Grid Corporation in June 2005 issue of "eighteen major accident prevention measures grid" to prevent the grounding grid and overvoltage The technical requirements for the design accident. 110kV and 220kV apply to the power grid is not effectively grounded neutral grounding transformer over-voltage protection. For the 110kV, 220 kV substation transformer neutral point equipment and reliable performance, easy installation and operation, layout simple and beautiful, huge billion Electric also introduced set transformer neutral point rod gap, the gap current transformers, disconnectors, surge arresters, terminal box and mounting brackets and other electrical equipment in one of the neutral point of the transformer equipment. Users can customize the use of pure transformer neutral point gap over-voltage protection scheme can also be used in parallel gap arresters, coordinated protection scheme. Arrester and isolation switch according to project needs, with a flexible group. Isolation switch actuator can choose manual or electric mode. Electrical and mechanical performance of all products in the factory are complete a full set of debugging and testing, it is also easy to use on-site re-calibration.