Phase difference testing circuit

Abstract

The invention provides a phase difference testing circuit. The phase difference testing circuit is mainly composed of a phase voltage and phase current input circuit, a phase difference detection circuit and a phase difference calculation circuit, wherein the phase voltage and phase current input circuit takes an electromagnetic induction type voltage transformer circuit as a circuit for processing phase voltage and phase current; the phase difference detection circuit is composed of a voltage comparator circuit and a D trigger phase discrimination circuit; the phase difference calculation circuit is a programmable counting device 8253 chip. The phase difference testing circuit provided by the invention has rapid response and high detection signal precision.

Description

technical field [0001] The invention relates to a phase difference test circuit. The invention mainly provides a phase difference test circuit for an intelligent low-voltage reactive power compensator. The invention belongs to the field of low-voltage smart grid control. Background technique [0002] Most of the electrical equipment in the low-voltage power distribution system are inductive loads, which cause the current phase to lag behind the voltage phase, and the electric energy is consumed on the transmission line of the power grid, which reduces the quality of the power supply of the power grid. Therefore, corresponding compensation measures must be taken, such as switching capacitors to the power grid At present, the main disadvantages of reactive power compensators commonly used in low-voltage power distribution systems are: large volume, low sampling accuracy, and no consideration of low-voltage load three-phase unbalance factors, three-phase Simultaneous switching,...

AI Technical Summary

Problems solved by technology

[0002] Most of the electrical equipment in the low-voltage power distribution system are inductive loads, which cause the current phase to lag behind the voltage phase, and the electric energy is consumed on the transmission line of the power grid, which makes the power supply quality of the power grid deteriorate. Therefore, corresponding compensation measures must be taken, such as switching capacitors to the power grid At present, the main disadvantages of reactive power compensators commonly used in low-voltage power distribution systems are: large volume, low sampling accuracy, and no consideration of low-voltage load three-phase unbalance factors, three-phase Simultaneous switching, the number of switching capacitors is small, the anti-interference ability and reliability are poor, etc., which often cause over-compensation or under-compensation of the power grid.

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