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Precautions for using power capacitors


1 When installing capacitors, the wiring of each capacitor should be connected to the busbar using separate flexible wires, and hard busbar connections should not be used to prevent assembly stress from causing damage to the capacitor sleeve and damaging the seal, resulting in oil leakage.

1 When installing capacitors, the wiring of each capacitor should be connected to the busbar using separate flexible wires, and hard busbar connections should not be used to prevent assembly stress from causing damage to the capacitor sleeve and damaging the seal, resulting in oil leakage.

2 Any poor contact in the capacitor circuit may cause high-frequency oscillating arcs, increasing the working electric field strength and heating of the capacitor, leading to early damage. Therefore, it is necessary to maintain good contact between the electrical circuit and the grounding part during installation.

3 When capacitors with lower voltage levels are connected in series and operated in a higher voltage level network, measures such as installing insulators equivalent to the operating voltage level should be taken to ensure reliable insulation between the shells of each capacitor and the ground.

4 After being connected in a star shape, the 4 capacitors are used for high rated voltage, and when the neutral point is not grounded, the shell of the capacitor should be insulated from the ground.

5 Before installing the 5 capacitors, the capacitance should be distributed once to ensure phase to phase balance, with a deviation not exceeding 5% of the total capacity. When a 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 6 pairs of individual compensation capacitors should be such that for induction motors that are directly started or started through rheostats, the capacitors that increase the power factor can be directly connected to the motor's output terminals, and no switchgear or fuses should be installed between the two; For induction motors starting with star delta starters, three single-phase capacitors should be used, with each capacitor directly connected in parallel to the two terminals of each phase winding, so that the connection of the capacitor always matches the connection method of the winding.

7 pairs of group compensation low-voltage capacitors should be connected to the outer side of the low-voltage group bus power switch to prevent self excitation phenomenon when the group bus switch is disconnected.

8 The low-voltage capacitor bank with centralized compensation should be equipped with a dedicated switch and installed on the outer side of the main switch of the line, rather than on the low-voltage bus.