... Test Sets are composed of seven items as below:-Instrument Transformer Tester, Model ITC-C,-Standard reference CT, Model HL-62CS ... the polarity fault and the ratio mistake. Technical Specifications: Instrument Transformer Tester, Model ITC-C -Input: Power Frequency: 50Hz±0.5Hz ... time at rated current ,the wire must be through the core if the current is over 150A. -Standard current ratio: ² Primary ...