Parameters of the Tester
1. High voltage output: 0.5 ~10kV, each step increases by 500V, with a total of 20 steps
The high voltage output cable can be used on the ground
Three frequencies: 45Hz, 50Hz, 55Hz
2. Capacity: 1500VA
3. Accuracy: tgδ: ±(reading*1.0%+0.08%)
Cx: ±(reading*1.5%+5PF)
4. Resolution: tgδ: 0.01% Cx: 1pF
5. Measurement range: 0.1% < tgδ < 50%
3PF< Cx < 60000PF
At 10KV, Cx ≤30000PF
At 5KV, Cx ≤60000PF
6. Power supply: AC 220V ±10% 50 ±1Hz
7. Harmonic adaptation: ≤3%
8. Operating conditions: -15°C-50°C, relative humidity <80%
9. Dimensions: 460(L)×335(W)×340(H)
10. Weight: 30 kg
Working principle:
After the variable frequency dielectric loss tester starts measurement, the high voltage set value is sent to the variable frequency power supply, which uses the PID algorithm to slowly adjust the output to the set value. The measurement circuit sends the actual high voltage to the variable frequency power supply, fine-tuning the low voltage to achieve accurate high voltage output. According to the positive/reverse wiring settings, the measurement circuit automatically selects the input and switches the range based on the test current. The measurement circuit uses Fourier transform to filter out interference, separates the fundamental wave of the signal, performs vector operations on the standard current and the test current, calculates capacitance from amplitude, and calculates tgδ from phase difference. Multiple measurements are repeated, and a median result is selected after sorting. After measurement, the measurement circuit sends a voltage reduction command, and the variable frequency power supply slowly reduces the voltage to 0.
