Transformer Testing Service - Comprehensive Voltage Ratio Verification, Insulation Resistance Measurement, Impulse Voltage Withstand Testing | Ensuring Accurate Winding Resistance, No Load Current, Load Loss And Temperature Rise Assessments

With our in-depth knowledge in this domain, we are actively engaged in manufacturing and supplying of the Transformer Testing Service in Bengaluru, Karnataka, India. The ratio should be checked at all taps and between all the winding. It is checked by applying a single-phase 230 V (approx) supply on the high voltage side and measuring the voltage on the low voltage side at all tap positions. The measured voltage on LV side shall conform to declining trend between tap (min) to tap (max) position for all phases. Polarity and interphone connections are checked while measuring the ratio. This can be checked by the ammeter method. The primary and secondary winding are connected together at points indicated in sketch shown below. A low voltage three-phase supply is then applied to the HV terminals. Readings obtained should be the vector sum of the separate voltages of each winding under consideration. Release trapped air through air release plugs and valve fitted for the purpose on various fittings like radiators, bushing caps, tank cover, Bushing turrets etc. The float lever of the magnetic oil level indicator (if provided) should be moved up and down between the end positions to check that the mechanism does not stick at any point. If the indicator has signaling contact they should be checked at the same time for correct operation. Checking the gauge by draining oil is a more positive test



Measurement of winding resistance
Verification of voltage ratio
Verification of vector group
Measurement of no load current and losses
Measurement of impedance and load losses
Measurement of insulation resistance
Power frequencies withstand voltage
Induced over voltage test
Air presser test

Type of Tests:
Impulse voltage withstand test
Temperature rise test
Other Information: