Application of Auxiliary Transformer Series Compensation Technology in Voltage Compensation of Power Voltage Transformer

Application of Auxiliary Transformer Series Compensation Technology in Voltage Compensation of Power Voltage Transformer

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In view of the fact that the supply voltage of power voltage transformer varies with load, this paper introduces a method of supply voltage compensation based on series compensation technology of auxiliary transformer.Taking a single-phase power supply voltage transformer with rated primary voltage of 110 / 3 kV and rated capacity 60 kV·A as an example, this paper calculates the variation rate of power supply voltage and capacity with load capacity and power factor.According to the rate of change, an automatic compensation circuit of power supply voltage is designed based on auxiliary transformer, which can realize the compensation of power supply voltage (+4.

4 V, +8.8 V, +13.2 V, +17.

6 V, +22 V, +26.
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.4 and +30.8 V).

The power factor cosφ=1 and cosφ=0.89 (inductive) are used to verify the power supply voltage compensation effect under different load capacities.The experimental results show that the power supply voltage change rate of the power supply voltage transformer increases from –1.

8% ~ + 11.36% to –3% ~ + 0.045% after adding the automatic series compensation circuit of the auxiliary transformer, and the requirements for the quality of single-phase 220 V power supply voltage can be satisfied.

The automatic series compensation technology of auxiliary transformer can be used to compensate the supply voltage of power supply voltage transformer, which solves the problem of low power factor of rural load and low supply voltage in peak load period, and can provide a guarantee for improving the voltage quality of users