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Power capacitor working principle and installation method

May 08, 2019


product description:

Power capacitors, also known as power compensation capacitors and reactive compensation capacitors, are new low-voltage self-healing capacitors that use advanced metallization membrane technology, special gold-spraying technology, and cylindrical aluminum shell structure to ensure stable performance and quality. In the power system, it can increase the effective power, reduce the reactive power loss, perform reactive power compensation (for the power factor correction of low-voltage equipment and the improvement of voltage waveform), and save power and energy. According to the occasion, it is divided into single-phase capacitors and three-phase capacitors.

Features:

1. Full dry design, gas protection, no oil leakage, no bulging, no pollution;

2. Overvoltage protection device design, double protection of overvoltage and overcurrent, excellent explosion-proof performance;

3, high-performance self-healing design, excellent self-healing function;

4, built-in discharge module, the touch terminal is more secure;

5, integrated non-indentation reinforced shell, strong explosion resistance, no risk of leakage;

6, the volume and weight are greatly reduced, only 1/3 of the old product.

Product Usage:

It is mainly used in low-voltage power distribution systems to perform reactive power compensation, reduce reactive power loss, improve power factor, and improve power quality.

Power capacitor installation method:

1. When installing power capacitors, the wiring of each capacitor is connected to the busbar by a separate cord. Do not use a hard busbar connection to prevent damage to the capacitor casing caused by assembly stress and damage to the oil leakage caused by the seal.

2. Any bad contact in the capacitor circuit may cause high-frequency oscillating arc, which will increase the working electric field strength of the capacitor and cause heat damage and early damage. Therefore, it is necessary to keep the electrical circuit and the grounding part in good contact during installation.

3. When capacitors of lower voltage level are operated in series and connected to a network of higher voltage class, the outer casing of each station should be reliably insulated by adding measures such as insulators of operating voltage level to the ground.

4. After the capacitor is connected by star, it is used for high rated voltage, and when the neutral point is not grounded, the outer casing of the capacitor should be insulated from the ground.

5. Before the capacitor is installed, the capacity should be allocated once to balance the phase, and the deviation should not exceed 5% of the total capacity. When the relay protection device is installed, it should also meet the requirement that the balance current error during operation does not exceed the relay protection action current.

6. The wiring of the individual compensation capacitors should be: for the induction motor that is directly started or started by the varistor, the capacitor for improving the power factor can be directly connected to the outlet terminal of the motor. Do not install the switch device or blow between the two. For the induction motor started with the star-delta starter, three single-phase capacitors are used, and each capacitor is directly connected in parallel to the two terminals of each phase winding, so that the wiring of the capacitor is always consistent with the connection of the winding.

7. For the group compensation Low Voltage Capacitor, it should be connected to the outside of the low voltage group bus power switch to prevent the self-excitation phenomenon when the group bus switch is disconnected.

8. The low-voltage capacitor bank with centralized compensation should be specially designed and installed on the outside of the main switch of the line, not on the low-voltage bus.

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