Capacitor Installation Precautions

1. When installing capacitors, it is better to use a separate cord to connect the busbars. Do not use hard busbar connections 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 early damage due to heat generation. 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 grades, the outer casings of the respective units should be reliably insulated by adding measures such as insulators of the operating voltage level to the ground.

4. After the capacitor is connected by a star, it is used for a 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 operating balance current error 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 capacitance of 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 an induction motor driven by a star-delta starter, it is preferable to use three single-phase capacitors, each of which is directly connected in parallel to the two terminals of each phase winding, so that the wiring of the capacitor is always connected to the winding. Consistent.

7. The packet compensation low voltage capacitor 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 turned off.

8. Centrally compensated low-voltage capacitor banks shall be specially designed and installed on the outside of the main line switch, not on the low-voltage bus.