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Application of Low Voltage Capacitor Reactive Power Compensation in Power Supply System

Release time：

2023-05-18 10:22

On the 0.4kV low-voltage side, a capacitor centralized compensation method is used to improve the power factor. In order to ensure that the power factor meets the standard, frequent switching of the capacitor is inevitable. In the process of switching will produce overvoltage and overcurrent hazards, this paper from the advantages of the capacitor itself, the principle of reactive power automatic compensation controller and other aspects to explain how to reduce the number of switching, improve the service life of the capacitor, but also the capacitor operation of the problem analysis and troubleshooting.

1. Capacitor characteristics

Overcurrent and overvoltage are unavoidable when the capacitor is switched in. The hazards of frequent overvoltage and overcurrent mainly include: (1) accelerating the aging process of the insulating medium of the capacitor; (2) Overvoltage causes the self-healing performance of the self-healing capacitor to fail in advance; (3) Intensify the partial discharge of the capacitor, promote insulation aging and capacitance attenuation; (4) The impact overcurrent makes the contact between the gold spray layer and the metallized layer of the self-healing shunt capacitor deteriorate, and even the gold spray layer falls off; (5) Overcurrent increases the operating temperature and shortens the service life. Through research in Japan, it has been concluded that the higher the heat aging temperature, the shorter the lifespan.

In order to adapt to the harm of overvoltage and overcurrent in capacitor switching, first of all, in the selection of capacitors, the German AEG capacitor used has four advantages: (2) In terms of structure: AEG capacitor adopts dry winding, installed in an aluminum cylinder, and its dielectric is a low-loss metallized polypropylene film. The capacitor consists of three groups of capacitors, electrically insulated from each other concentrically arranged on the aluminum tube core, and the three groups of capacitors are connected by a star or triangle. AEG capacitors can be installed in any place due to their typed structure, and their interior is filled with protective gas (N350) and are non-flammable; (130000) In terms of bearing high-current loads: the capacitor must withstand the large current peak generated during the switching process without affecting the life of the capacitor. The AEG capacitor can withstand high inrush current up to 3 times the rated current, and the service life reaches <>,<> hours; (<>) Self-healing performance of capacitors: During switching operations, the voltage value of the low-voltage power grid may reach <> times the rated voltage, which is not allowed. The characteristic of AEG capacitors is that as long as the voltage strength breaks down the dielectric, the self-healing function of the capacitor comes into play. After self-healing, AEG capacitors can continue to operate; (<>) Automatic disconnection of faulty capacitor features: AEG capacitors are equipped with overpressure expansion fuses. If the fault point repeatedly heals itself, causing the internal pressure to rise and reach a certain value, the expansion fuse is activated. At this time, the top cover of the aluminum cylinder will bulge slightly, and the fuse will be pulled off at the design break. Expansion fuses safely disconnect AEG capacitors from the power system.

In summary, AEG capacitors have good self-healing properties, fault separation, anti-overcurrent and overvoltage characteristics in performance, and can be well adapted to work.

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Hongrun New Product: NHR-3600 Series Reactive Power Compensation Controller

In summary, the "reactive power compensation controller" is the key to effective control of enterprise power management.

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Hongrun New Product: NHR-3600 Series Reactive Power Compensation Controller

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In summary, the "reactive power compensation controller" is the key to effective control of enterprise power management.

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