1 When installing the power compensation capacitor, it is better to connect the wiring of each capacitor to the busbar with a separate cord. Do not use a hard busbar connection to prevent damage to the capacitor casing caused by assembly stress and damage the oil leakage caused by the seal.
2 Any poor contact of the power compensation capacitor in the 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. (Note: Keep the electrical circuit and grounding parts in good contact.)
3 When the power compensation capacitors of lower voltage level are operated in series and operated in a higher voltage class network, the outer casing of each platform 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 higher 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 individual power compensation capacitors should be: for induction motors with direct start or varistor start, the capacitors with improved power factor can be directly connected to the outlet terminals of the motor. Do not install switchgear or blow between the two. For induction motors starting with a star-delta starter, it is best 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 Group compensation low voltage capacitors should be connected outside the low voltage group bus power switch to prevent self-excitation caused when the group bus switch is disconnected.
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.
The above are the eight major issues that concern when installing power compensation capacitors.