Three-Phase Capacitance and Inductance Tester
Three-phase capacitance and inductance tester is specially developed to address the problems existing in on-site measurement of the capacitance value of individual capacitors in shunt capacitor banks at substations. It focuses on solving the following problems:
(1) On-site measurement of individual capacitors requires disconnecting connecting wires, which is not only heavy workload but also easy to damage capacitors.
(2) The low output voltage of capacitance meters leads to low fault detection rate.
(3) Measuring the inductance of reactors.
(4) Quickly measuring the capacitance of individual capacitors in three-phase delta and Y-connected capacitor banks.
Technical Parameters
1. Capacitance range: 0.2μF～2,000μF;
Capacity range: 5～20,000 kvar;
Measurement accuracy: 0.2μF～2μF (internal CT) ±1% reading ±0.02μF;
0.2μF～2μF (clamp meter) ±1.5% reading ±0.05μF;
2μF～2,000μF ±1% reading ±2 digits;
2. Inductance range: 1mH～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. Working conditions:
a. Ambient temperature: 0℃～ +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 amplifier circuits. The voltage signal output from the voltage amplifier circuit and the current signal output from the current amplifier 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 disconnecting connecting wires. In addition, the gear during measurement is automatically selected, avoiding errors caused by manual operation, with good stability, good repeatability, and accurate and reliable results.
