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    Tag: capacitor

    Capacitor Troubleshooting

    As a reactive power compensation device, the capacitor is an important equipment for the safe operation of the power grid. It plays an important role in adjusting the voltage of the power grid, reducing line losses, and improving the quality of power supply. But in actual application, due to the influence of human factors and various aspects of the environment. The capacitor frequently fails during operation, which affects normal operation. The following is an analysis of related failures about capacitance.

    Shunt Power Capacitor Price List

    ATO provides two categories of capacitors: low voltage shunt power capacitor of the self-healing type (three-phase series) and self-healing low voltage shunt capacitor (single phase, for mineral thermal oven).
    Self-healing low voltage shunt power capacitors are used in 50Hz and 6oHz power system. The function of these capacitors contains: reducing reactive power loss, improving voltage quality, enlarging capacity of voltage transformer, etc.
    Even though the capacitor’s price varies with its capacity, ATO self-healing three/single phase shunt power capacitors are inexpensive. Here is the price list and welcome to select the best one for you!

    What Would Cause a Capacitor to Fail?

    Cause of damage of parallel power capacitor

    • When cutting off the capacitor bank, restriking overvoltage caused by breaker restrike leads to the insulation damage or breakdown between capacitors. Some capacitor banks don’t have any overvoltage protection measures nor series reactor, particularly, the frequently operated capacitors easily lead to insulation damage or even explosion.
    • Too large current over the capacitor and overcurrent caused by overcurrent harmonics in power grid make the capacitor overheated, insulation reduction or even damage.
    • The capacitor is not equipped with a single fuse or the fuse characteristics (characteristic aegis of ampere second) are too poor. When the internal components of the capacitor are seriously breakdown and the fault current is generated, the fuse can't fuse in time. Meanwhile, effective protective relaying measures fail to keep up, overcurrent leads to a sharp rise in the temperature inside the capacitor and thereof leads to capacitor expansion or explosion.
    • Poor product quality. The paper oil insulation fails to be dried or dipping treatment under a strict vacuum condition, the residual bubbles inside produce partial discharge under the long-term working voltage, while partial discharge further leads to insulation damage and aging. As a result, the temperature also rises, which eventually leads to electrochemical breakdown of components and the capacitor damages.