Split-phase compensation self-healing type reactive compensation capacitor

Abstract

The invention discloses a split-phase compensation self-healing type reactive compensation capacitor comprising a capacitor shell, four connecting terminals, a connecting wire and a metallized thin film, wherein the connecting terminals and the metallized thin film are connected by the connecting wire, potting materials are filled in the capacitor shells, the connecting terminals comprise three three-phase connecting terminals and one neutral-point connecting terminal, and the connecting mode of the capacitor is in a three-phase and four-wire Y connecting mode; a plastic base is arranged in the capacitor shell, the terminals are provided with four copper cylinders, cooper sheets are arranged under the copper cylinders; the bottom of the capacitor shell is provided with a film rolling axis, and the metalized thin film is a polypropylene metalized thin film which is winded on the axis. The invention has functions of compensation and distribution. The required capacitance for each phase can be input respectively, so that the reactive compensation of each phase achieves the optimum state, which has an obvious effect on improving the power factor of a power grid, improving the efficiency of the power grid, reducing line loss, improving voltage quality, reducing electricity consumption, increasing the active capacity of a transformer, reducing distribution cost, and saving space.

Description

technical field [0001] The invention relates to the technical field of electrical components, and more specifically relates to a phase-splitting compensation self-healing low-voltage reactive power compensation capacitor. Background technique [0002] The role of the reactive power compensation device in the electronic power supply system is to improve the power factor of the power grid, reduce the loss of power supply transformers and transmission lines, improve power supply efficiency, improve the power supply environment, and meet the requirements of the power grid load terminal voltage level and economic operation. Therefore, the reactive power compensation device is in an indispensable and very important position in the power supply system. Reasonable selection of compensation devices can reduce the transmission of reactive power, thereby reducing voltage drop, minimizing network loss, improving power grid quality, and having good economic effects. Conversely, if it is...

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Problems solved by technology

However, when the three-phase circuit is unbalanced, it can only ensure that one of the three phases is in the best compensation state, but does not ensure the compensation effect of the other two phases, which will easily cause over-compensation or under-compensation, and cause over-compensation in the line. The condition of voltage or high current will cause damage to the circuit and equipment. During operation, when one phase is damaged, the other two phases are still running, which will easily cause the capacitor to explode or damage the equipment.

[0004] Especially in civil buildings, because civil buildings use a large number of single-phase loads, it is easy to cause serious unbalance of three-phase loads, because the sampling signal for compensating reactive power is taken from any of the three phases, resulting in unsampled The other two phases are either overcompensated or undercompensated

If it is overcompensated, the voltage of the overcompensated phase will increase, which will easily cause damage to electrical equipment such as control and protection components due to overvoltage; if it is undercompensated, the current of the compensated phase will increase, and equipment such as lines and circuit breakers will be damaged by the current The increase causes the heat to be burned out

Therefore, the traditional three-phase reactive power compensation method cannot be used

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