supply of current transformer and potential transformer testing kit supply of current transformer and potential transformer testing kit for eee department , current transformer and potential transformer testing kit , current transformer and potential transformer testing kit specification • variable ac voltage source of 0-220v ac & variable ac current source of 0-25 a consists of automatic trip timer by dspic33ch • autotransformer for voltage / current adjustment with mcb protection • voltage transformer (pt) of 220/110v ac and current transformer of 25/5a provided with primary and secondary termination • all to be mounted on a panel with diagram engraved stickered front panel with digital ac voltmeter and ac ammeter • provision for measuring ratio error of ct & pt