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A Three-phase AC Voltage Phase Sequence Monitoring System

A three-phase AC and phase sequence monitoring technology, which is applied in phase sequence/synchronous indication, electrical components, circuit devices, etc., can solve the problems of complex operation, large volume and low accuracy of phase sequence detection circuit, and achieve high detection accuracy , Safe protection and convenient operation

Active Publication Date: 2017-11-03
SHANGHAI CHENZHU INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a three-phase AC voltage phase sequence monitoring system, which is used to solve the problem of large volume, low accuracy and poor operation of the three-phase AC voltage phase sequence detection circuit in the prior art. Complicated issues

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  • A Three-phase AC Voltage Phase Sequence Monitoring System
  • A Three-phase AC Voltage Phase Sequence Monitoring System
  • A Three-phase AC Voltage Phase Sequence Monitoring System

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Embodiment Construction

[0048] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0049] see Figure 1 to Figure 13 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed ar...

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Abstract

The invention provides a three-phase AC voltage phase sequence monitoring system, comprising: a step-down filter shaping circuit; a comparison circuit for comparing the three-phase AC voltage processed by the step-down filter shaping circuit with a reference voltage and outputting three-way comparison results; A logic circuit that detects the phase sequence of the three-phase AC voltage and outputs a judgment signal according to the three-way comparison result; drives the drive protection circuit of the relay according to the judgment signal; and generates an indication signal according to the output signal of the drive protection circuit. When the three-phase AC voltage When the phase sequence of the three-phase AC voltage is correct, it outputs a correct indication signal; when the phase sequence of the three-phase AC voltage is disordered or there is a phase loss, it outputs an alarm indication signal. The invention detects the phase sequence of the three-phase AC voltage to drive the relay, thereby protecting the safety of electrical equipment and effectively avoiding unnecessary losses caused by phase sequence disorder and phase loss; at the same time, because the invention is integrated in Inside the circuit module of the chip, the volume is small, the operation is convenient, and the detection accuracy is high.

Description

technical field [0001] The invention relates to the field of electricity safety, in particular to a three-phase AC voltage phase sequence monitoring system. Background technique [0002] The phase sequence of three-phase AC includes positive sequence, negative sequence and zero sequence. When three-phase AC is applied, the phase sequence plays an important role in the safe operation of equipment in the fields of electricity, electronics, instrumentation, automatic control and power electronics, and often requires detection and judgment Whether the phase sequence of the three-phase AC power supply is correct and whether there is a phase loss problem. If the phase sequence is wrong or there is a phase loss, it is necessary to protect the devices in the circuit in time to avoid damage to the devices. When the three-phase photovoltaic grid-connected inverter is connected to the grid, if the phase sequence of the inverter and the grid are inconsistent, it will cause a large inrus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/38H02H3/253G01R29/18
Inventor 倪敏
Owner SHANGHAI CHENZHU INSTR