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1. 发明专利

JPH02140669A TESTING DEVICE FOR CURRENT TRANSFORMER 失效
公开(公告)号：JPH02140669A
公开(公告)日：1990-05-30
申请号：JP29355888
申请日：1988-11-22
申请人： TOSHIBA CORP
发明人： BABA YASUO , SERIZAWA SUMIO
IPC分类号： G01R31/00 , G01R29/20
摘要： PURPOSE:To perform a current ratio test and a polarity confirmation test at the same time by making a small sinewave current come from a current generating part to pass through a matching part and an amplifier part. CONSTITUTION:The small sinewave current (a) is supplied by the current generating part 1 to the matching part 2 and the primary winding 6 of a current transformer to be tested. Next, the current (a) is converted to a reference current (b) through the matching part 2 and the amplifier part 3, then supplied to a differential voltage detecting part 4. On the other hand, the current (a) supplied to the primary winding 6 of the current transformer to be tested is supplied to the differential voltage detecting part 4 generating a secondary winding current (c) in accordance with the winding ratio of the primary winding 6 and the secondary winding 7. By the detection part 4, the differential voltage is detected in the manner of combining the currents (b) and (c), and converted to a display signal (f) then sent to the display part 5. The signal (f) is indicated on the display part 5. The winding ratio of the primary winding and the polarity for the current transformer are thus tested at the same time.

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