Matters needing attention: Power capacitor installation

1, the installation of capacitors, the best of each capacitor wiring using a separate cord connected with the bus, do not use hard bus connections to prevent assembly stress caused by damage to the capacitor casing, seal damage caused by oil spills.

2, any bad contacts in the capacitor circuit may cause high-frequency oscillating arc, so that the working electric field strength of the capacitor increases and the heat is damaged early. Therefore, the installation must be kept in good contact with the ground and the electrical circuit.

3, the lower voltage level of the capacitor after the series run in the higher voltage network, its each of the shell to ground, should be installed by the equivalent of operating voltage level insulators and other measures to make it reliable insulation.

4, the capacitor connected by the star, for a high level of rated voltage, and the system is not grounded neutral point, the capacitor should be insulated to the shell.

5, before the capacitor is installed, it is necessary to allocate a capacity so that its phase balance, the deviation does not exceed 5% of the total capacity.When equipped with relay protection device should also meet the balance of current error does not exceed the current protection operation Claim.

6, the individual compensation capacitor wiring should be done: Direct start or rheostat induction motor, the capacitor to improve the power factor can be directly connected with the motor outlet terminals, the switch between the two should not be installed or fuse device ; of a star - delta starter induction motor starting, preferably using three single-phase capacitor, each capacitor is directly connected in parallel with two winding terminals of each phase, so that the wiring and the capacitor is always connected to the windings wears Consistent.

7, compensation for low-voltage capacitor group, should be connected to the low-voltage packet bus power switch outside to prevent the group bus switch off the self-excitation phenomenon.

8, concentrated compensation of low-voltage capacitor bank, should be dedicated switch and mounted on the outside of the main line switch, not mounted on the low voltage bus.