1.Overview
In power system of 6-66KV, when capacitive current associated with single phase ground fault excess 10A (It is 30A in 6-10KV cable circuit system), arc suppression coil device should be adopted to prevent arc grounding, remove earth fault and improve power supply quality.

2. Operation condition
2.1. Ambient Temp: -15℃～+45℃
2.2. Relative Humidity: Less than 95%
2.3. Altitude: less than 2000m (if excess, please specially indicate)
2.4. No corrosive gas around the site and no conductive dust
2.5. No sever shocked movement around the site
2.6. Micro-computer controller screen is to be installed in master control of the station. Grounding transformer, ASC device and damping resistor are to be installed outdoor or indoor with good ventilation

3. Technical performance index
3.1. Voltage class: 6KV, 10KV, 35KV
3.2. Measuring error of capacitive current: less than 2%
3.3. The residual current at single-phase earth fault: less than 5A
3.4. Fault response time less than 20ms
a) Controller power requirement: A Alternating current 220V, rated frequency 50Hz
A Direct current 220V/110V, rated frequency 50Hz
35. communication interface: RS232/RS485

4. Ordering instructions
4.1. System voltage grade: 6KV, 10KV, 35KV
4.2. Arc Suppression Coil capacity
4.3. The capacity of arc suppression coil is determined according to the size of the capacitive current under the single-phase grounding fault and should have a certain margin
4.4. The grounding transformer capacity
4.5. the quantity of zero sequence current transformer