Legal inspection according to the Electricity Business Act
– Protection relay operation characteristic test
(Precision inspection)
1) Overcurrent and ground fault overcurrent relay
2) Ratio operation relay
3) Overvoltage and ground fault overvoltage relay
4) Directional short circuit relay
5) Directional ground relay
– Ground resistance measurement
– Insulation resistance measurement
– Equipment operation test
– Interlock test

GIS gas pressure inspection
Imported transformer oil analysis
Vacuum test for breaker, etc.