CN2266826Y - Phase-defect protector for three-phase AC electric motor - Google Patents
Phase-defect protector for three-phase AC electric motor Download PDFInfo
- Publication number
- CN2266826Y CN2266826Y CN 96225349 CN96225349U CN2266826Y CN 2266826 Y CN2266826 Y CN 2266826Y CN 96225349 CN96225349 CN 96225349 CN 96225349 U CN96225349 U CN 96225349U CN 2266826 Y CN2266826 Y CN 2266826Y
- Authority
- CN
- China
- Prior art keywords
- phase
- contactor
- power supply
- main contact
- motor
- 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
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- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The utility model belongs to an electric protection device, relating an open-phase protector for a three-phase AC motor. In the utility model, the phase of a power supply B is connected with the normally closed contact RJ < 1 > of a thermal relay, an AC contactor attracting coil C and a power supply by a power switch, a fuse and a starting button to form a loop, and the phase of the power supply A is connected with a voltage relay YJ by a power switching fuse, an AC contactor main contact C < 1 > and then connected with a power supply C by an AC contactor main contact C < 3 >, the thermal relay and the power switch. When an open-phase accident arises, the AC contactor attracting coil C has no electric current, which makes the AC contactor main contact C < 1 >, an AC contactor main contact C < 2 > and the AC contactor main contact C < 3 > switched off, and a motor stops rotating. The utility model is suitable for the open-phase protection of the motors whose voltage is less than 500V and the volumetric capacity is less than 75W.
Description
The utility model belongs to motor protecting device, the following low-voltage three-phase AC motor phase failure protection device of particularly a kind of 500V.
Three-phase alternating-current motor is widely used in the power-equipment of all trades and professions.But because electric network fault, blown fuse or loose contact, reasons such as switch, A.C. contactor damage cause the operation of motor phase shortage, and the accident of burning motor happens occasionally.At present, low-tension fuse, thermal relay protection are used in overload, the short circuit of three-phase alternating-current motor.Because damaging, electric network fault or switch and A.C. contactor cause phase shortage; make the motor current of operation at rating become 1.73 times of rated current; much smaller than short circuit current; low-tension fuse can not fuse; hot operate time of protection is long, and low precision is because load variations prolongs operate time of protection or can not move; do not reach the protection purpose, burn motor.Especially to the motor of continuous operation, unattended water pump, blower fan, very easily burn the motor phenomenon, lead to the production liability accident.
The purpose of this utility model is to solve above technical deficiency, and a kind of safe, effective, practical, reliable low-voltage three-phase AC motor phase failure protection device is provided.
The three-phase alternating-current motor open phase protector by power supply B through mains switch HK, fuse RD
2Start button, meet thermal relay normally closed contact RJ
1, exchange tentaculum pull-in winding C, constitute the loop mutually to power supply A, another routing power A is through mains switch HK, fuse RD
1, A.C. contactor main contact C
1Meet voltage relay YJ, through A.C. contactor main contact C
3, fuse RD
3, mains switch HK constitutes the loop mutually to power supply C.When the circuit phase shortage, A.C. contactor pull-in winding C no current makes main contact C
1, C
2, C
3Disconnect, the motor stall avoids motor and burns.
Three-phase alternating-current motor constitutes the protection loop with thermal relay, voltage relay, the A.C. contactor of low-voltage variation electrical equipment, and simple in structure, protection effectively, and is safe and reliable.
Specify with by way of example below in conjunction with accompanying drawing.
Fig. 1 shows three-phase alternating-current motor phase-lacking protector circuit schematic diagram.
Fig. 1 is the embodiment of three-phase alternating-current motor open-phase protection.Its circuit is by power supply B phase → mains switch HK → fuse RD
2→ start button QA
1→ stop button TA → thermal relay normally closed contact RJ
1, meet A.C. contactor pull-in winding C → start button QA
2→ power supply A constitutes the loop mutually, and another routing power A is through mains switch HK, fuse RD
1Meet A.C. contactor main contact C
1Meet voltage relay YJ, A.C. contactor main contact C
3Constitute the loop mutually to power supply C.
During the work of three-phase alternating-current motor open phase protector, closed mains switch HK engages starting button QA
1, QA
2, ac contactor coil C gets.The loop by power supply B through mains switch HK → fuse RD
2→ start button QA
1→ stop button TA → thermal relay normally closed contact RJ
1→ ac contactor coil C → start button QA
2→ power supply A phase composition.A.C. contactor C closure, motor starting.Voltage relay YJ gets electric, voltage relay normally opened contact YJ
1Closed.Button QA
1, QA
2Lift QA
1, QA
2Normal opened contact is by A.C. contactor main contact C
2, YJ
1The junction closure self-insurance, it is electric that ac contactor coil C is got, and motor runs well.
If because of electric network fault, or HK, RD, A.C. contactor are undesired, and when causing the three phase electric machine phase shortage, its protection is: 1.B phase phase shortage, and because of the B phase voltage is zero, ac contactor coil C no current, A.C. contactor main contact C
1, C
2, C
3Open, motor shuts down; 2.A phase or C phase phase shortage, voltage relay YJ coil no current, normally opened contact YJ
1Open, ac contactor coil C must not be electric, A.C. contactor main contact C
1, C
2, C
3Open, motor shuts down.
The three-phase alternating-current motor open phase protector is applicable to below the voltage 500V that the alternating current motor open-phase protection of capacity below 75KW has actual effect and reliability.
Claims (1)
1, a kind of three-phase alternating-current motor phase-lacking protector circuit is by power supply B phase → mains switch HK → fuse RD
2→ start button QA
1→ stop button TA → thermal relay normally closed contact RJ
1, also comprise it is characterized in that connecing A.C. contactor pull-in winding C → start button QA
2→ power supply A constitutes the loop mutually, and another routing power A is through mains switch HK, fuse RD
1Through A.C. contactor main contact C
1Meet voltage relay YJ, A.C. contactor main contact C
3Constitute the loop mutually to power supply C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96225349 CN2266826Y (en) | 1996-02-02 | 1996-02-02 | Phase-defect protector for three-phase AC electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96225349 CN2266826Y (en) | 1996-02-02 | 1996-02-02 | Phase-defect protector for three-phase AC electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2266826Y true CN2266826Y (en) | 1997-11-05 |
Family
ID=33904055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96225349 Expired - Fee Related CN2266826Y (en) | 1996-02-02 | 1996-02-02 | Phase-defect protector for three-phase AC electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2266826Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035180A (en) * | 2010-12-07 | 2011-04-27 | 河南省电力公司许昌供电公司 | Comprehensive protection device for three-phase alternating current asynchronous motor |
-
1996
- 1996-02-02 CN CN 96225349 patent/CN2266826Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035180A (en) * | 2010-12-07 | 2011-04-27 | 河南省电力公司许昌供电公司 | Comprehensive protection device for three-phase alternating current asynchronous motor |
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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 |