Grounding resistor

for transformers

Regarding the 6kV~35kV transmission and distribution systems which are mainly made up of cable wiring, we can adopt low resistance grounding mode in case of big capacitive current resulting from single phase grounding fault. However, we should consider the requirement of power supply reliability, influence to electrical equipment resulting from the fault transient voltage and current, influence to communication, requirement of relay protection technology and local operating experience. Product Feature • Low level of system overvoltage: Low level of system overvoltage (less than 2.5Ue) when adopting resistor grounding mode. • Fast failure isolation: Under feeder zero-sequence protection, the fault part will be isolated by tripping as soon as feeder failure occurs. • Intelligent monitoring: With configurable intelligent controller, we can monitor the resistor temperature, current and earthing times. • Infrared Temperature Measurement: We use infrared temperature non-contacting measurement to measure the resistor temperature, the primary and secondary equipment is completely isolated, so that the result will be sensitive and accurate. The temperature change will make a response with in 1.5 seconds. • High Insulation Level: Guaranteed by the best material used between resistor element like mica and ceramics, both the insulation level between resistor elements and resistor element -fixed element is high.