ZON Series 110 kV Grounding Devices for Effective Transformer Neutral Protection

Earthing switches of ZON-110 kV series are designed for earthing of power transformers neutrals, both having current transformer in the neutral for protection against earth faults and not having protection against earth faults. Earthing switches are installed on stationary transformer substations in AC networks with nominal voltage 110 kV. Earthing switches of ZON-110 type are also installed on mobile transformer substations.

Earthing switches are completed with manual drives of PWG type. Z - earthing switch; O - single-pole; H - outdoor installation; M,B-modernised, reinforced. Main technical characteristics: <ul> <li>- rated voltage - 110 kV;</li> <li>rated current - 400 A;</li> <li>rated frequency - 50 Hz;</li> <li>rated short-term withstand current (thermal resistance current) - 6.3 kA;</li> <li>the highest peak of rated short-term withstand current (electrodynamic resistance current) - 15.75 kA;</li> <li>time of flow of nominal short-term withstand current...</li> </ul>.