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How to install Power Capacitor?

Time:2024-03-11   Author:As Beam   Browse:

Environmental Requirements for Installing Compensation Capacitors:


  1. Capacitors should be installed in places free from corrosive gases, steam, severe vibrations, impacts, explosions, flammability, and other hazards. The fire protection level of capacitors should not be lower than level two.

  2. Outdoor capacitors should be protected from direct sunlight.

  3. The ambient temperature of the capacitor room should meet the manufacturer's requirements, generally set at 40℃.

  4. If ventilators are installed in the capacitor room, the outlet should be placed at the top of the capacitor bank. Inlet and exhaust fans should preferably be installed diagonally.

  5. The capacitor room may use natural lighting or artificial illumination and does not need heating equipment.

  6. The door of the high-voltage capacitor room should open outward.



Technical Requirements for Capacitor Installation:


  1. To save installation space, high-voltage capacitors can be installed on iron frames in layers, but no more than three layers vertically without horizontal spacers between layers to ensure good heat dissipation. The installation positions of the upper, middle, and lower capacitors should be consistent, with the nameplates facing outward.

  2. The iron frames for high-voltage capacitors should be arranged in one or two rows, with a maintenance aisle between rows. The aisle width should be no less than 1.5m.

  3. Iron frames for high-voltage capacitor banks must be equipped with wire mesh barriers, with mesh holes of 3~4cm² being appropriate.

  4. The distance between the outer shells of high-voltage capacitors should generally not be less than 10cm; the distance between the outer shells of low-voltage capacitors should not be less than 50mm.

  5. Inside the high-voltage capacitor room, the net distance between layers should not be less than 0.2m; the distance from the bottom of the lower layer capacitors to the ground should not be less than 0.3m.

  6. Each capacitor connected to the busbar should use individual flexible conductors instead of rigid busbars to avoid stress on the porcelain bushings during installation or operation, preventing oil leaks or damage.

  7. During installation, ensure good contact surfaces for the electrical circuit and grounding parts. Any poor contact in the capacitor circuit may generate high-frequency oscillatory arcs, increasing the working electric field strength and causing heat damage to the capacitor.


  8. When lower voltage capacitors are run in series in higher voltage networks, insulators corresponding to the operational voltage level should be added between each unit's casing and the ground to ensure reliable insulation.

  9. When capacitors are connected in a star configuration and used at a higher rated voltage with an ungrounded neutral point, the casing of the capacitors should be insulated from the ground.

  10. Before installing capacitors, distribute the capacitance once to balance it among phases, with a deviation not exceeding 5% of the total capacity. When equipped with relay protection devices, the balance of operating current error should not exceed the action current of the relay protection.

  11. For individual compensation capacitors: For induction motors started directly or through a resistor, the power factor improving capacitors can be connected directly to the motor's output terminals without switches or fuses between them. For induction motors started with a star-delta starter, it is better to use three single-phase capacitors, each directly paralleled to the two terminals of each phase winding, ensuring the capacitor wiring always matches the winding connection.

  12. For group-compensated low-voltage capacitors, they should be connected on the outside of the low-voltage group busbar power switch to prevent self-excitation phenomena when the group busbar switch is disconnected.

  13. For centrally compensated low-voltage capacitor banks, a dedicated switch should be installed outside the main circuit breaker, not on the low-voltage busbar.

New industry Technology regarding to Bussmann fuse, ABB breakers, Amphenol connectors, HPS transformers, etc. 

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