Reactive power compensation capacitor is an important equipment to satisfy the reactive power balance of the power system. In recent years, the problem of reactive power has received general attention from the electrical industry, and a large number of reactive power compensation devices have been put into operation in the distribution network. The power supply requires the real-time balance of active and reactive power in the system. Therefore, the reactive power compensation device should meet the requirements of automatic tracking and real-time compensation, which inevitably requires frequent switching and switching of the reactive power compensation capacitor bank. The switching operation of the capacitor bank will produce overcurrent and overvoltage shocks, which will cause damage to the capacitor. In order to ensure the reliability of the equipment, early detection of capacitor defects and avoid the expansion of faults, regular inspections are required. In the field, capacitors are all connected in groups in parallel. The traditional method is to remove the capacitor bus and then use the old-fashioned capacitance meter to measure. Since the capacitor bank is composed of dozens to hundreds of small capacitors, it is necessary to disconnect the wires to measure the capacitance. The amount is large, and frequent removal of the wires will cause the screws to slip or not be tightened, leaving a safety hazard, and it is also easy to cause secondary damage to the capacitor. Therefore, it is highly desirable to have a test instrument that can measure the capacitance of each small capacitor without removing the wires, reduce the burden of maintenance personnel, improve the efficiency of maintenance work, and improve the safety of the operation of the distribution network.

In view of the actual situation on the spot, our company has developed this kind of instrument that uses the new test method to carry out the measurement after tackling key problems. The instrument can measure the single capacitor of a group of parallel capacitors without disconnecting the wires, using the measurement principle and four-terminal measurement technology, which can accurately measure and have good test repeatability; it conforms to the national standard of SJ-255-10300 capacitance measuring instrument . At the same time, it can also measure the inductance of various reactors. The instrument has convenient wiring and simple operation, which reduces the workload of maintenance personnel, greatly improves the efficiency of on-site testing, and provides a safety guarantee for the normal operation of the power grid.

* This instrument can measure the single capacitance of a group of parallel capacitors without disconnecting the wires (both single-phase capacitance and three-phase capacitance can be measured). At the same time, this instrument can also measure the inductance of various reactors to meet various requirements on site. use. The three-phase capacitance measurement is wired once according to the connection method of the capacitor bank according to the wiring diagram. The built-in automatic commutation wiring function of the instrument eliminates the cumbersome wiring commutation short-circuit operation, and the result is automatically output after the test is completed.

* During the measurement, this instrument can display the measured voltage, current, power, frequency, impedance, phase angle and other data while displaying the measured capacitance value or inductance value, so as to better analyze the quality of the test product;

* The instrument uses an 8.0-inch 800×600 graphic dot matrix 65K color screen, touch operation, clear observation during day and night, Chinese menu prompts, easy operation.

* Built-in large-capacity non-volatile memory in the instrument: 200 sets of measurement data can be stored.

The instrument is equipped with a U disk interface, which can store any group of measurement data (limited by the capacity of the U disk).

* Built-in high-precision real-time clock function in the instrument: date and time can be calibrated.

* The instrument comes with a high-speed micro thermal printer: it can print measurement and historical data.

* The instrument test power supply overcurrent protection function: short-circuit of the power output will not damage the instrument.

1. Test voltage: AC 25V±10%, 50Hz

AC 1.25V±10%, 50Hz 25VA

2. Measuring range and accuracy:

Measurable capacitance range: 0.1uF～6800uF±(reading 1%+0.02uF)

Measurable inductance range: 50uH～20H ±(reading 3%+0.05uH)

Measurable current range: 5mA～20A±(reading 3%+0.05mA)

Measurable resistance range: 20mΩ～20kΩ±(reading 3%+0.1mΩ)

3. Dimensions: 400mm×300mm×200mm