In low-voltage power systems, due to the continuous instability of power load and power quality. Many companies have started investing in improving power capacitor equipment. However, some enterprise users have the production characteristic of continuously overloading low-voltage power capacitors every day, and over time, the equipment itself has experienced a lot of failures.
1, Types of faults caused by overload
The overload use of low-voltage power capacitors can cause a series of faults, mainly including the following:
1. Capacitor breakdown
Long term operation of the internal dielectric of capacitors under overload conditions can lead to the accumulation of heat in the dielectric material, which in turn can cause dielectric breakdown. After breakdown, a short circuit may occur inside the capacitor, which may lead to a larger scale power accident.
2. Capacity reduction
Overload can lead to a decrease in the long-term stability of capacitors, resulting in a decrease in their effective capacitance value. When the effective capacitance of a capacitor decreases, its reactive power compensation capability will also weaken, ultimately affecting the overall efficiency of the power system.
3. Current imbalance
In an environment where multiple capacitors are working in parallel, overloading of one capacitor may result in uneven current distribution throughout the circuit, leading to current imbalance and ultimately affecting the normal operation of power equipment, increasing the failure rate.
2, Preventive and treatment measures
To avoid a series of problems caused by overload use of low-voltage power capacitors, the following are some preventive and treatment measures:
1. Correct selection of capacitors
When choosing low-voltage power capacitors, appropriate capacitor models and capacities should be selected based on actual load requirements and reactive power compensation capabilities to avoid overload problems caused by improper selection.
2. Install protective devices
During the use of capacitors, it is recommended to install overload protectors and temperature monitoring systems, which can promptly identify overload conditions and trigger alarms to prevent accidents from occurring.
3. Develop a reasonable usage plan
Reasonably arranging the use plan of capacitors during seasons with high loads can effectively reduce overload situations during peak hours and ensure the safe and stable operation of the power system.
Low voltage power capacitors are devices that can stabilize the operation of power systems and improve power quality. Nowadays, it is often applied in various industries. With the wide range of applications, more and more capacitor overload problems are occurring. Therefore, enterprise users should reasonably control the operating time after investing in capacitor equipment to avoid overloading.