As information and electronic technology advances rapidly, the pace of updates and replacements for digital electronic products is accelerating, with the sales and production of consumer electronics such as flat-panel TVs (LCD and PDP), laptops, and digital cameras continuously growing, driving the capacitor industry's expansion. Therefore, it is necessary to inspect and maintain capacitors on a daily basis. But how should they be maintained?

Check if the discharge indicator light bulb is burned out.

Ensure the temperature of the capacitors is normal and the ventilation in the capacitor room is adequate.

Is the isolating fuse intact?

Check if the ammeter on the capacitor assembly is functioning properly and if it exceeds the rated value.

Check for any abnormal sounds in the capacitor assembly during operation.

The porcelain section is clean and free of discharge marks.

7. Is the isolating fuse in good condition?

When capacitors exhibit the following failures, they should be removed from operation:

(1) Contact overheating or melting;

(2) Internal discharging sounds and abnormal noises from the point discharge equipment.

(3) Casing flashover or discharge;

(4) Shell expansion or deformation.

Capacitors often exhibit issues such as swollen or deformed casings, as well as oil leakage, which can be visually identified. Current, however, can only be determined through measuring instruments. You should check if each phase's current in the three-phase capacitor exceeds the rated value, and if the currents in each phase are approximately equal. If there's a significant difference, like Phase A being 20A, Phase B being 21A, and Phase C being 47A, it's abnormal. In such cases, it's advisable to replace the capacitor and disconnect the power source.