... current ,electric energy measuring, and relay protection in electricity system. it is oil paper insulated product, and composed by ... for metering and relay protection of 35kv, 50 or 60HZ system.Service ConditionAmbient temperature: -40~+40°CAltitude: LVB(T)-35 ... T)-35GY(W1,W2,W3) less than 1000mEnvironment Pollution Level: II, III, IVSystem ConditionSystem Rated Voltage: 66kvSystem Highest Voltage: 72 ...