... current transformer, wihich is used for metering and relay protection of 35kv, 50 or 60HZ system.Service ConditionAmbient temperature: -40~+40 ... 60HZRated Transformation Ratio2*25~2*1000/5 or 1ANumber of Secondary Windings1~5Accuracy of Measuring Winding0.2,0.2S,0.5,0 ... .5SAccuracy of Protection Winding5P or 10PRated Secondary Output20~50VAAccuracy Limite Factors15,20, ...