Three-phase power supply phase loss detection device

A three-phase power supply and detection device technology, applied in the direction of asymmetric measurement of multi-phase networks, can solve problems such as high cost and many circuit components, and achieve the effects of reduced production cost, good electromagnetic compatibility, and simple assembly and debugging.

Inactive Publication Date: 2015-08-26
TIANJIN HAOYA SCI & TECH DEV
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  • Summary
  • 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 p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] figure 1 Among them, (L1), (L2), (L3) are three-phase power input; (J) is a small relay, which outputs phase-opening information through moving-on contact (J-1) and moving-break contact (J-2) , (J) pull-in state means that the three-phase power supply has no open-phase fault, (J) release state means that one of the three-phase power supply has an open-phase fault; (OC1) is an optocoupler, is one The output is a triac optocoupler, used for voltage monitoring circuit and relay drive circuit; (V1) is a single-phase rectifier bridge, alternating current is input from (AC1~) and (AC2~), direct current is from (DC+) and ( DC-) output.

[0020] figure 1 In, the pull-in coil of the relay (J) is connected in series with the voltage divider resistor (R3) and then respectively connected to the DC output (DC+) and (DC-) of the single-phase rectifier bridge (V1). The AC input (AC1~) of the single-phase rectifier bridge (V1) is connected to the three-phase power input (L1); the AC input

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Abstract

A three-phase power supply phase loss detection device outputs a detection result via the suction and release states of a relay (J) and adopts a three-phase power supply (L1)-(L3) to rectify and supply power, and a circuit of the power supply forms a detection function of the phase loss faults of an L1 phase and an L3 phase by itself. The detection of an L2 phase adopts a detection circuit based on an optocoupler application technology, and a rectifier diode (D1), a current-limiting resistor (R1) and a filter capacitor (C1) form a half wave rectifying circuit of the three-phase power supply (L2)-(L3). An input light emitting diode of an optocoupler (OC1) is accessed in the half wave rectifying circuit via an input resistor (R2), an output bidirectional silicon controlled rectifier series single-phase rectifier bridge (V1) is accessed in the three-phase power supply (L1)-(L3), and the suction and release control of the relay (J)is realized by controlling the on-off of the output bidirectional silicon controlled rectifier series single-phase rectifier bridge (V1). The detection circuit of the present invention is compact and practical, the number of the circuit components of the detection device is small, and the cost performance is higher.

Description

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Claims

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Application Information

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Owner TIANJIN HAOYA SCI & TECH DEV
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