Three-Phase Capacitance and Inductance Tester
Three-phase capacitance and inductance tester is specially developed for the problems existing in on-site measurement of individual capacitor capacitance in shunt capacitor banks at substations. It focuses on solving the following problems:
（1）Measuring individual capacitors on-site requires removing connecting wires, which is not only labor-intensive but also prone to damaging the capacitors.
（2）The low output voltage of capacitance meters leads to a low fault detection rate.
（3）Measuring the inductance of reactors.
（4��Quickly measuring the capacitance of individual capacitors in three-phase delta and wye connected capacitor banks.
Technical Parameters
1. Capacitance range: 0.2μF to 2,000μF;
Capacity range: 5 to 20,000 kvar;
Measurement accuracy: 0.2μF to 2μF (internal CT) ±1% reading ±0.02μF;
0.2μF to 2μF (clamp meter) ±1.5% reading ±0.05μF;
2μF to 2,000μF ±1% reading ±2 digits;
2. Inductance range: 1mH to 9.99H; Measurement accuracy: ±1.5% reading ±2 digits
3. Output measurement voltage: AC 26V/500VA; 50Hz;
4. Display method: LCD screen, full Chinese output, panel-type thermal printer
5. Dimensions/Weight: 370×370×220 mm/ 16kg
6. Operating conditions:
a. Ambient temperature: 0℃ to +40℃, relative humidity: ≤90%
b. Power supply: AC 220V±10%; 50Hz;
Working Principle
In the tested capacitor branch, there is a sampling circuit that samples the voltage and current of the tested capacitor. The output terminals of the sampling circuit are respectively connected to amplification circuits. The voltage signal output from the voltage amplification circuit and the current signal output from the current amplification circuit pass through a phase detector to output a phase difference signal. After the voltage signal and current signal pass through an A/D converter, they are input to the CPU for calculation to obtain the tested capacitance value. The movable current sampling unit allows direct measurement of capacitance without removing connecting wires. In addition, the gear during the measurement process is automatically selected, avoiding errors caused by manual operation, with good stability, good repeatability, and accurate and reliable results.
