Under what circumstances will the low-voltage compensation capacitor be unable to operate?

Low-voltage compensation capacitors, as a key device for reactive power regulation in power systems, require specific conditions for safe operation. In certain abnormal situations, forcibly energizing the capacitors not only affects the compensation effect but may also lead to equipment damage or even safety accidents. So, under what circumstances cannot low-voltage compensation capacitors be operated?

Ⅰ. Abnormal electrical parameter conditions

1. Overvoltage operating condition:

The system voltage has continuously exceeded the upper limit.
There is a serious voltage imbalance.
The risk of overvoltage operation has not been eliminated.

2. Harmonic pollution of the environment:

Excessive background harmonic content
Characteristics of resonance phenomenon occurrence
The harmonic amplification effect is very obvious.

II. Abnormal Conditions of the Equipment Body

1. Damage to the exterior structure:

The shell has undergone significant deformation and bulging.
Insulation medium leakage traces
The terminal connectors have overheated and turned discolored.

2. Degradation of performance parameters:

Abnormal change in capacitance value
The insulation resistance has significantly decreased.
The tangent value of the loss angle exceeds the standard limit.

III. Defects of the System's Accompanying Facilities

1. Failure of the protection device:

Abnormality in the overcurrent protection function
Temperature monitoring system failure
The discharge circuit is incomplete.

2. Installation conditions do not meet requirements:

There is a serious lack of ventilation and heat dissipation.
The safety distance cannot be guaranteed.
The environmental humidity has remained consistently above the standard level.