Standard for Replacement of Low-Voltage Reactive Power Compensation Electrical Capacitors

In the power system, low-voltage reactive power compensation electrical capacitors compensate for reactive power, reduce line losses, and enhance the stability and efficiency of the power grid. However, as the usage time increases, low-voltage reactive power compensation electrical capacitors may experience aging and damage, which can affect their performance. Replacement is necessary.

I. Replacement Standards for Low-Voltage Reactive Power Compensation Electrical Capacitors

In order to ensure the normal operation of low-voltage reactive power compensation electrical capacitors, it is necessary to formulate scientific replacement standards. The following are the common replacement standards:

1. The capacity has decreased by more than 10% of the rated value.

The capacity of a capacitor is an important indicator of its reactive power compensation capability. If the actual capacity of the capacitor is found to be lower than 90% of the rated value during inspection, it indicates that its compensation capability has significantly declined and it should be replaced in time.

2. Insulation resistance is lower than the specified value.

The insulation resistance of a capacitor is an important parameter for evaluating its insulation performance. If the insulation resistance is lower than the minimum value specified by the manufacturer, it indicates that the insulation performance of the capacitor has failed to meet the standard, and there is a risk of leakage or short circuit. In such cases, the capacitor should be replaced immediately.

3. Appearance damage or bulging

If you notice any deformation, bulging or cracks on the casing of the capacitor, it indicates that there might be abnormal pressure or damage to the medium inside. Continuing to use it could lead to an explosion or fire, so it must be replaced immediately.

4. Abnormal operating temperature

During the operation of the capacitor, if the temperature continuously exceeds the upper limit value specified by the manufacturer, it may indicate an internal fault or poor heat dissipation. At this point, the machine should be shut down for inspection. If necessary, the capacitor should be replaced.

5. Expiration of service life

The service life of low-voltage reactive power compensation power capacitors is usually 8 to 10 years. Even if there are no obvious problems with the appearance and performance, they should be replaced when reaching their service life to avoid potential safety hazards.

6. Frequent circuit breaker trips or operation of protection devices

If the capacitor frequently trips the circuit breaker or triggers the protection device during operation, it indicates that there might be an internal fault or a mismatch with the system. Therefore, it is necessary to conduct an inspection and replace it.