A switch switching device applied to a series AC voltage stabilizer

Abstract

The invention discloses a switch diverting device applied to a series-connection alternating current voltage stabilizer. The switch diverting device comprises a first transformer and a switch diverting unit. The switch diverting unit comprises a first switch, a second switch, a third switch, a fourth switch, a low-voltage side live wire link, a live wire high-voltage side link, a null wire high-voltage side link and a load. A series-connection type diverter switch is connected to the high-voltage side of a transformer. When large current passes through a load loop, the high-voltage side current is small according to the relation of current and transformation ratio of the transformer, and switches K1-K8 with small capacity can be used for controlling the transformer, so that the device cost is greatly saved, and reliability is improved. Meanwhile, the parallel-connection first compensation shunting mode is adopted, the problem that overvoltage is generated during diversion of switch states when the series-connection alternating current voltage stabilizer operates is solved, a diverter switch and a transformer winding can be effectively protected, equipment losses are avoided, and equipment can stably operate on site for a long time.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a switching device applied to a series AC voltage stabilizer. Background technique [0002] When the power supply radius of the low-voltage power grid is relatively large and the power supply line is relatively thin, it is easy to cause the power supply voltage at the outlet side of the transformer to be normal, but the voltage drop of the line varies widely, and the terminal voltage does not meet the standard. If the voltage is too low, it cannot work normally; when the voltage is high, it may damage the electrical equipment due to the high voltage. [0003] Such as figure 1 The power circuit shown in the factory is generally connected with a reactive power compensation power capacitor at the substation. Assuming that the middle power supply line is relatively thin, the line resistance and line inductance are both large. When the power loads of several workshops are relatively la...

AI Technical Summary

Problems solved by technology

[0005] Although the autotransformer can use a smaller iron core to transfer a larger capacity, but in this circuit, all the grid input current and output current are switched by switches, and the switch capacity is large.

And when mechanical switches are used, the switching life of high-power mechanical switches is limited; when power electronic devices are used, the high-power power electronic devices themselves have a large loss, and the internal temperature of the device rises when the load is running, and the heat dissipation device occupies a large part of the device. space

In addition, whether it is a high-power mechanical switch or a high-power power electronic switch, the cost is very high

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