Used to test all performance parameters of current transformers,
such as error, insulation resistance, primary withstand voltage,
secondary withstand voltage, and turn-to-turn insulation, etc
Used to test all performance parameters of voltage transformers,
including error, insulation resistance, primary withstand voltage,
secondary withstand voltage, partial discharge, etc
The three-phase mutual inductor calibration device is an important
equipment for measuring the error of the mutual inductor in the
calibration box. This device consists of a three-phase voltage
regulator, a three-phase mutual inductor load box, a three-phase
standard mutual inductor, and a three-phase mutual inductor
calibration instrument, which serves as the basis for the error
measurement of the mutual inductor.
The following components must be provided according to actual
requirements: voltage regulator, load box for current transformer,
standard current transformer, and current transformer calibration
instrument.
Testing requirements for current transformers and voltage
transformers with the following specifications: voltage level ≤35kV
and rated current ≤5000A.
The test items include: Current Transformer:
1) Accuracy test;
2) Primary end power frequency withstand voltage test;
3) Capacitance and dielectric loss factor measurement;
4) Interphase power frequency withstand voltage test;
5) Secondary end power frequency withstand voltage test;
6) Secondary winding resistance (Rct) measurement;
7) Turn-to-turn overvoltage test;
8) Secondary circuit time constant measurement;
9) Rated turn-off potential and rated turn-off excitation current
test;
10) Turn-to-turn overvoltage test;
11) Remanence coefficient measurement;
12) Instrument security factor measurement for current
transformers.
Voltage transformer:
1) Accuracy test;
2) Excitation characteristic measurement;
3) Primary end power frequency withstand voltage test;
4) Capacitance and dielectric loss factor measurement;
5) Interphase power frequency withstand voltage test;
6) Secondary end power frequency withstand voltage test
