Precautions for the installation of the hottest po

2022-08-26
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Precautions for the installation of power capacitors

1 when installing capacitors, it is best to use separate flexible wires to connect each capacitor to the bus instead of hard bus connections, so as to prevent oil leakage caused by the damage of capacitor bushings and the destruction of seals caused by assembly stress

2 any bad contact in the capacitor circuit may cause high-frequency oscillating arc, increase the working electric field strength and heat of the capacitor and cause early damage. Therefore, the electrical circuit and grounding part must be in good contact during installation

3 when the capacitors with lower voltage level operate in series and are basically idle in the network with higher voltage level, the shell of each set should be reliably insulated between the ground by adding insulators equivalent to the operating voltage level

4 after the capacitor is star connected, it is used for a higher rated voltage, and when the neutral point is not grounded, the shell of the capacitor should be insulated from the ground

5 before the capacitor is installed, the primary capacitance shall be distributed to make its phase to phase balance, and the deviation shall not exceed 5% of the total capacity. When the relay protection device is installed, it should also meet the requirements that the balance current error during operation does not exceed the relay protection action current

6 the wiring of individual compensation capacitors should be: for induction motors that are directly started or started by rheostat, the capacitance that improves the power factor can be directly connected with the outgoing terminal of the motor, and there should be no switchgear or fuse between them; For the induction motor started by star delta starter, it is not necessary to tear open the packing bag when using it. It is best to use three times to disassemble and test the workpiece; One single-phase capacitor, each capacitor is directly connected in parallel on the two terminals of each phase winding, so that the wiring of the capacitor is always consistent with the connection method of the winding

7 the group compensation low-voltage capacitor should be connected to the outside of the low-voltage group bus power switch to prevent self excitation when the group bus switch is disconnected

8 the low-voltage capacitor bank with centralized compensation should be equipped with a special switch and installed on the outside of the main switch, rather than on the low-voltage bus

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