CN2381055Y - Phaseloose protector for motor - Google Patents

Phaseloose protector for motor Download PDF

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Publication number
CN2381055Y
CN2381055Y CN 99212872 CN99212872U CN2381055Y CN 2381055 Y CN2381055 Y CN 2381055Y CN 99212872 CN99212872 CN 99212872 CN 99212872 U CN99212872 U CN 99212872U CN 2381055 Y CN2381055 Y CN 2381055Y
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CN
China
Prior art keywords
relay
phase
motor
diode
contactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 99212872
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Chinese (zh)
Inventor
黎显银
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Individual
Original Assignee
Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to CN 99212872 priority Critical patent/CN2381055Y/en
Application granted granted Critical
Publication of CN2381055Y publication Critical patent/CN2381055Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model provides a phase-failure protector for a motor. Three symmetrical capacitors are respectively connected with three-phase wires according to star connection, a star point is connected with a relay coil after rectified by a diode, and the normally closed contacts of the relay are connected with a control loop of a main contactor. When any phase failure of a three-phase power cord is opposite, star point voltage displaces, the relay can operate after the star point voltage is rectified by the diode, the contactor has power cut, and the motor can not operate any longer when the normally closed contacts D and E are disconnected. The utility model has the advantages of simple circuit, few elements, low cost and high reliability.

Description

Open phase protector of motor
The utility model relates to a kind of open phase protector of motor, belongs to emergency protective circuit device class.
Existing three phase electric machine generally adopts A.C. contactor or auto-transformer starter control, and when having one to cut off the power supply mutually in the three-phase power line, A.C. contactor or auto-transformer starter coil might not cut off the power supply, so that very easily burn out motor.
The purpose of this utility model is to provide a kind of open phase protector of motor, and any one when cutting off the power supply mutually in three-phase power line, can guarantee the coil blackout of A.C. contactor, and electromagnet is discharged, and cuts off motor power, prevents that motor from moving under the phase shortage situation and burnt.
The purpose of this utility model is achieved in that by three symmetrical electric capacity and connects three-phase power line respectively by star connection that its asterism is the cut-in relay coil after the diode bridge rectification, in the control loop of relay normally-closed contact access main contactor.
The utility model utilizes three-phase imbalance neutral displacement principle, by directly promoting relay work after the diode bridge rectification.Circuit is simple, and element is few, and cost is low, good reliability.
Below in conjunction with accompanying drawing the utility model embodiment is described.
Fig. 1 is the utility model circuit structure schematic diagram.
Fig. 2 is that the utility model is at the operating protection winding diagram of motor.
Among Fig. 1, capacitor C 1, C2 and C3 insert three-phase power line A, B, C respectively by star connection, and its asterism N is cut-in relay J coil behind diode D1, D2, D3 and D4 bridge rectifier.Among Fig. 2; in the control loop of relay J normally-closed contact D, E incoming transport contactor C; X1, X2 and X3 are respectively three phase mains; HK is a threephase switch, and QA is a starting button, and TA is a stop button; C is the A.C. contactor control coil; HR is the A.C. contactor main contacts, and DJ is a motor, and BH is this protector.
Its operation principle is: when the normal distribution of three phase mains, asterism N voltage is low or be 0, the input of no-voltage electric current, relay J is failure to actuate, when arbitrary when cutting off the power supply mutually in the triple line, and asterism N electric voltage displacement, it will be by the synthetic alternating voltage of other two-phase vector addition, behind diode D1, D2, D3 and D4 bridge full-wave rectifier, input relay J coil, the actuating of relay, disconnect normally-closed contact D, E, this moment main contactor C coil blackout, contactor loss of excitation and tripping outage, the phase shortage motor does not rerun.

Claims (1)

1. open phase protector of motor; comprise electric capacity, diode and relay; it is characterized in that three symmetrical capacitor C 1, C2 and C3 meet three-phase power line A, B, C respectively by star connection; its asterism N is cut-in relay J coil behind diode D1, D2, D3 and D4 bridge rectifier, and relay J normally-closed contact D, E insert in the control loop of main contactor C.
CN 99212872 1999-06-04 1999-06-04 Phaseloose protector for motor Expired - Fee Related CN2381055Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 99212872 CN2381055Y (en) 1999-06-04 1999-06-04 Phaseloose protector for motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 99212872 CN2381055Y (en) 1999-06-04 1999-06-04 Phaseloose protector for motor

Publications (1)

Publication Number Publication Date
CN2381055Y true CN2381055Y (en) 2000-05-31

Family

ID=34005434

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 99212872 Expired - Fee Related CN2381055Y (en) 1999-06-04 1999-06-04 Phaseloose protector for motor

Country Status (1)

Country Link
CN (1) CN2381055Y (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104917150A (en) * 2015-07-03 2015-09-16 国网辽宁省电力有限公司抚顺供电公司 Simple motor open-phase protector device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104917150A (en) * 2015-07-03 2015-09-16 国网辽宁省电力有限公司抚顺供电公司 Simple motor open-phase protector device

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee