低压无功补偿的概念（The concept of low-voltage reactive power compensation）.docVIP

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低压无功补偿的概念（The concept of low-voltage reactive power compensation）.doc

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低压无功补偿的概念（The concept of low-voltage reactive power compensation）

低压无功补偿的概念（The concept of low-voltage reactive power compensation） I. The concept of low voltage reactive power compensation Low voltage reactive power compensation refers to the installation of compensation devices in the low-voltage (380) 400 volt network of distribution transformers, including random compensation, servo compensation and tracking compensation. Random compensation: the random compensation is to connect the low voltage capacitor through the fuse and the motor, and then switch the protection device and the motor at the same time. Follower compensation: following the compensator, the low voltage capacitor is fixed through the fuse and connected to the low voltage side of the distribution transformer to compensate for the excitation and magnetic leakage and reactive power losses of the transformer. Tracking compensation: tracking compensation refers to the reactive power compensation, switching and cutting device as the control and protection device. The low voltage capacitor bank is connected to the 400 volt bus of the large user. This method of compensation is equivalent to the function of follower compensation. Select several groups of low voltage capacitors as manual or automatic switching to compensate the reactive load in the 400 volt network at any time. Two. Analysis of reactive power load in rural power network In our existing 10 thousand volt transmission system, it is often a line with several or more than ten or even two or thirty capacity transformers. Because the user is scattered, transformer capacity is small, the following 75 thousand KVA transformer accounted for more than 70%, and most of the transformer every day nearly 15 hours to no-load operation, running between the minority in the rated capacity of 20% to 40%, when the planting or harvesting season, will appear unbalanced reactive power. In the above network status, the original rural network users, 10 thousand volts line sending end or distribution, transformer users are not eq