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Phase sequence judging circuit based on asymmetrical three-phase circuit theory

A three-phase circuit and phase sequence judgment technology, which is applied in the direction of phase sequence/synchronous indication, can solve the problems of inconvenient operation, accuracy, unsatisfactory reliability and circuit cost, etc., and achieve the effect of easy implementation

Inactive Publication Date: 2012-04-11
CHANGZHOU JIEXUN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the phase sequence determination technologies rely on multi-synthetic oscilloscopes to observe the phases of the three-phase voltage waveforms to determine the phase sequence. Although it is accurate, the operation is very inconvenient. Other technologies are often unsatisfactory in terms of accuracy, reliability, and circuit cost.

Method used

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  • Phase sequence judging circuit based on asymmetrical three-phase circuit theory
  • Phase sequence judging circuit based on asymmetrical three-phase circuit theory
  • Phase sequence judging circuit based on asymmetrical three-phase circuit theory

Examples

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Effect test

Embodiment Construction

[0015] Asymmetrical three-phase circuits such as figure 1 As shown in (a), the figure assumes that:

[0016] X C = 1 ωC = R B = R C = R ( = 1 G )

[0017] G is the admittance, since X C It is a capacitive reactance, so the circuit load is asymmetrical, and the circuit is further transformed into a phase voltage source symmetrical (load asymmetrical) circuit, such as figure 1 (b) shown.

[0018] figure 1 The neutral point voltage in (b) (that is, the voltage between the neutral point of the load and the neutral point of the power supply) is

[0019] U · N , N ...

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Abstract

The invention relates to a phase sequence judging circuit, in particular to a phase sequence judging circuit based on an asymmetrical three-phase circuit theory. The invention mainly aims to provide a circuit scheme which has the characteristics of reliability, accuracy, quickness, conciseness and low cost and is used for judging the phase sequence in a low-voltage three-phase power supply system. The basic content of the invention refers to a circuit special for judging the phase sequence in a three-phase low-voltage power supply system constituted on the basis of an asymmetrical three-phase circuit theory. The phase sequence judging circuit is in a photoelectric coupler output form or a relay output form, and comprises an asymmetrical three-phase input loop, a bypass resistor, a diode rectifier bridge, a filtering capacitor, an LED (Light-Emitting Diode), a photoelectric coupler or a relay and the like, wherein the asymmetrical three-phase input loop consists of a capacitor and a resistor.

Description

technical field [0001] The invention relates to a phase sequence judging circuit, in particular to a phase sequence judging circuit based on the theory of an asymmetrical three-phase circuit. Background technique [0002] In many cases, electrical equipment has strict requirements on the phase sequence of the three-phase power supply, which cannot be connected incorrectly, that is, if the phase sequence of A-B-C is stipulated, it cannot be connected to the phase sequence of A-C-B or C-B-A, otherwise the equipment using three-phase power supply may It cannot work normally, such as: when the phase is wrong, the output voltage of the three-phase fully-controlled rectifier bridge becomes uncontrollable; the three-phase AC asynchronous motor will reverse and so on. In general, it is often difficult to confirm the phase sequence of the three-phase power distribution line, and once the phase sequence of the power supply line changes, the phase sequence must be re-determined. If a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/18
Inventor 姚广平
Owner CHANGZHOU JIEXUN ELECTRONICS
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