Small current grounding line selection device is a new generation of small current grounding device developed by our company's scientific and technological personnel after summing up the successful and failed experiences and lessons of various small current grounding line selection devices in China over the past decade. The device has been greatly improved in the design of software and hardware, which makes the device work stably, without debugging, convenient setting and more accurate line selection.

It can meet the following conditions: line selection and timely alarm of small current grounding system, or for single-phase grounding protection trip.

1. Small grounded current system with ungrounded neutral point

2. Small current grounding system with neutral point grounded by arc suppression coil or large resistance

3. Voltage level 0.38 ~ 66kV

4. The number of bus sections shall not be more than four, and the total number of outgoing circuits shall not be more than 56

It can be widely used in substations, power plants, hydropower stations and power supply systems of large factories and mines such as petroleum, chemical industry, metallurgy, coal, railway, construction, etc.