Transformer Winding Resistance Meter is designed to measure the winding resistance of transformers, Inductors, generators and motor windings, Tap Changers, Bus Bar contacts,Power Cables etc
It is specially designed for Highly Inductive objects like 765kV/400kV/220kV. This is only indigenous TWRM which gives very fast readings for 3Phase Star -Delta any combination Transformers. The built in open circuit Features Voltage of DC Supply ensures that core of the transformer is saturated for fast measurements to be taken.Care is taken to absorb the Back emf of such transformers. For user safety, Indication for discharge is provided on front panel,if the current through winding under measurement is disturbed/discontinued.
Instrument has built in 10A regulated and highly stable specifical current surce with current seletion of 10A,5A,1A,0.1A Power supply 100mA & 10mA Instrument uses ratio -metric circuit where the resistance of specimen is compared with known internal standard and 4 1/2 digit LCD display is provided for resistance measurement in microohm, milliohms and in ohms.
Tap changers time and graph OLTC time and current deviation in% Heat run graph test time Vs resistance.