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Three-phase power supply phase lack detection device

A three-phase power supply, phase loss detection technology, applied in power supply testing, multi-phase network asymmetry measurement, etc., can solve problems such as high cost and many circuit components, and achieve reduced production cost, low operating power consumption, and assembly and Debugging Simple Effects

Inactive Publication Date: 2015-08-05
TIANJIN HAOYA SCI & TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above technical solution, the number of components used in the detection circuit is relatively large, and the detection circuit uses DC low-voltage power supply, which needs to be obtained from the power supply through a power conversion device. There are many circuit components and the cost is relatively high.

Method used

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  • Three-phase power supply phase lack detection device

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Embodiment Construction

[0017] figure 1 Among them, L1, L2, and L3 are three-phase power input; J is a small relay, which outputs phase loss information through the moving contact J-1 and moving contact J-2, and the state of J pull-in indicates that there is no phase loss fault in the three-phase power supply , J release state indicates that one or two or three phases of the three-phase power supply have a phase failure; OC1 is a photocoupler whose output is a bidirectional thyristor, used for voltage monitoring circuits and relay drive circuits; D1, D2 D3 is a light-emitting diode; R1 is a voltage divider resistor; R2 and R3 are current limiting resistors; C1 is a filter capacitor.

[0018] figure 1 Among them, the rectifier diode D1 is connected to the three-phase power supply L1, and forms an L1-L3 half-wave rectification circuit with the three-phase power supply L3, and the relay pull-in coil is connected in series with the output end of the photocoupler and connected to the L1-L3 half-wave rect...

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Abstract

The invention provides a three-phase power supply phase interruption detection device. A detection result is outputted through the suction and release states of a relay (J), a three-phase power supply L1-L3 is employed to carry out half-wave rectification power supply, and the detection function of L1 and L3 phase interruption faults is formed by a power supply circuit. The detection circuit based on the optocoupler application technology is used to detect an L2 phase, and the half-wave rectification circuit of a three-phase power supply L2-L3 is formed by a rectifier diode (D2), a current limiting resistor (R2) and a filter capacitor (C1). The input light emitting diode of an optocoupler (OC1) is connected to the half-wave rectification circuit through a resistor (R3), and the output bidirectional thyristor is connected to a relay (J) attracting coil to realize the control of attracting and releasing. The detection circuit is simple and practical, the number of circuit components of the detection device is small, and the performance price ratio is high.

Description

technical field [0001] The invention relates to a safety protection device for a power supply system, in particular to a detection device for a phase loss fault of a three-phase power supply. Background technique [0002] In order to ensure the safe operation of electrical equipment, the three-phase power supply system is usually equipped with a phase loss detection device. [0003] There are many patents on phase loss detection retrieved, and the technical solutions mainly include the following three types: [0004] 1. Detect the change of the voltage neutral point of the three-phase power supply to the ground voltage. When the three-phase voltage is balanced, the neutral point potential of the star connection method is zero. When a phase failure occurs, the neutral point potential is greatly displaced. The detection circuit realizes phase loss protection. Related patents include CN 103166188 A three-phase power supply phase loss protector, CN 201616655 U a kind of three-...

Claims

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Application Information

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IPC IPC(8): G01R29/16G01R31/42
Inventor 刘培
Owner TIANJIN HAOYA SCI & TECH DEV
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