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Open phase protector of motor

A technology for open-phase protectors and motors, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as thermal relay delay protection failures, and achieve the effect of protecting the open-phase protector and facilitating solutions

Inactive Publication Date: 2010-11-17
XINXING ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a three-phase motor phase loss protector, which solves the problem of thermal relay delay protection failure, and has phase loss indication, easy to use, simple in structure, low in manufacturing cost and convenient in maintenance

Method used

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  • Open phase protector of motor
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  • Open phase protector of motor

Examples

Experimental program
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Embodiment Construction

[0009] The motor phase loss protector is connected according to the structural schematic diagram of the attached figure. When the three-phase alternating current is normally fed in, the coils of the intermediate relays K01, K02, and K03 are energized, and the normally open auxiliary contacts of the intermediate relays K01, K02, and K03 are all closed. The contactor KM01 can pull in at this time, the motor M can work, the normally closed auxiliary contacts of the intermediate relays K01, K02, K03 are all disconnected, and the fault indicator lights LD01, LD02, LD3 are all extinguished.

[0010] When the three-phase AC power is out of phase (assuming that T1 is out of phase), the coils of the intermediate relays K01 and K02 are energized, the coils of the intermediate relay K03 are de-energized, the normally open auxiliary contacts of the intermediate relay K03 are disconnected, and the contactor KM01 It will also be disconnected, the motor M stops working, the normally closed au...

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Abstract

The invention discloses an open phase protector of a motor, belonging to the technical field of safety protection of motors and comprising three intermediate relays, indicating lamps and a control circuit. The open phase protector is characterized by the combination of three intermediate relays in the control circuit; a work coil of each intermediate relay is independently connected into one-phase alternating current; common terminals of the three intermediate relays are connected together and connected into a zero line; normally-open auxiliary contacts of the three intermediate relays are respectively serially connected into the control circuit of the motor and achieve the effect of protecting the motor; and normally-closed auxiliary contacts of the three intermediate relays are respectively connected with three indicating lamps and used for open phase indication. The invention has the advantages that the faults can be clearly judged by observing the open-phase indicting lamps and are convenient to solve, and meanwhile, the open-phase protector of an electric three-phase motor can be protected.

Description

technical field [0001] The invention belongs to the technical field of motor safety protection, and in particular provides a motor phase loss protector, which is a three-phase motor phase loss protector. Background technique [0002] The existing motor safety protection devices generally use a thermal relay connected in series in the primary circuit to control the AC contactor in the secondary circuit, so as to achieve the purpose of protecting the motor. However, the inaccuracy of the time delay of the thermal relay often causes the protection to fail, thereby damaging the motor and causing great economic losses to the user. Contents of the invention [0003] The object of the present invention is to provide a phase loss protector for a three-phase motor, which solves the problem of failure of the time-delay protection of the thermal relay, has phase loss indication, is easy to use, simple in structure, low in manufacturing cost and convenient in maintenance. [0004] Th...

Claims

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Application Information

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IPC IPC(8): H02H7/093
Inventor 杨杰姚震龙韩红娟
Owner XINXING ENERGY EQUIP