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1. Test items
- RMS of three phase voltage: Uab,Ubc,Uca.
- Average value of three phase AC voltage: Uab,Ubc,Uca.
- RMS of three phase current: Ia,Ib,Ic.
- Percentage of No-load loss and No-load current: Po,Io%.
- Load loss, impedance voltage percentage, short circuit impedance: Pt,ekt,Zt.
- Load loss, impedance voltage percentage and short circuit impedance at any specified temperature.
- Transformer actual capacity and judged capacity.
2. Environment conditions
- Temperature: -5°C-40°C;
- Relative humidity: <95% (25°C);
- Altitude: <2500m;
- External interference: no special strong vibration, no special electromagnetic field;
- External power supply: 220VAC±10%, 45Hz~55Hz;
3. Measurement range
- Capacity:
10kV Oil-immersed, dry type transformer: 30kVA ~ 2500kVA;
35kV Oil-immersed transformer: 50kVA ~ 31500kVA;
20kV Dry type transformer: 50kVA ~ 2500kVA;
35kV Dry type transformer: 50kVA～2000kVA;
- Voltage: 0 ~ 450V (phase voltage), 0 ~ 800V (line voltage), auto switching range;
- Current: 0 ~ 100A, auto switching range;
- Frequency: 45Hz～65Hz;
4. Measurement accuracy
- Voltage: 20~100V, ±0.2%FS; 100~450V, ±(0.2%+3 digit);
- Current: 0.5~10A, ±0.2%FS; 10~100A, ±(0.2%+3 digit);
- Power: ±0.5% (CosΦ>0.1), ±1.0% (0.02<CosΦ<0.1)
5. Insulation strength
- The insulation resistance of the voltage and current input terminals to the enclosure is ≥100MΩ.
- The withstand voltage test between power input terminal and the enclosure is 2kV(RMS) for 1 minutes.
