CN2591833Y - Three phase star type connection motor defect phase protector - Google Patents
Three phase star type connection motor defect phase protector Download PDFInfo
- Publication number
- CN2591833Y CN2591833Y CN 02290654 CN02290654U CN2591833Y CN 2591833 Y CN2591833 Y CN 2591833Y CN 02290654 CN02290654 CN 02290654 CN 02290654 U CN02290654 U CN 02290654U CN 2591833 Y CN2591833 Y CN 2591833Y
- Authority
- CN
- China
- Prior art keywords
- phase
- connection motor
- contact point
- contactor
- star type
- 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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- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses a three-phase star type connection motor phase-absent protector, which comprises a normally open contact point of a contactor, which is connected with a three-phase star type motor power cord; a stop button, a contactor coil, a self-protection contact point and a normally closed contact point of a relay are connected with each other in series between two phases of three-phase wires of an inlet contact point of the normally open contact point of the contactor; both ends of the self-protection contact point are connected with start buttons in parallel; one end of the relay coil is connected with a neutral point of a three-phase star type connection motor; the other end of the relay coil is connected with the ground. The protector ensures that current in a power circuit is not overloaded; the phenomenon that the three-phase star type connection motor is burned out because any phase electricity is cut off can be reliably avoided. The utility model has the advantages of the reduction of the number of electric appliance elements, no analog elements, long service life and simple structure.
Description
Technical field
The utility model belongs to the automatic safety device of motor, when being specifically related to the unexpected phase failure of a kind of three-phase wye connection motor, and the protector that can cut off the electricity supply.
Background technology
At present the safety measure taked of motor be GPF (General Protection False, this protection based on fuse and three-phase knife switch, what have is used contactor, stop button and start button.This safety measure; its fuse can only react short circuit current or overload current; and can not react the situation of circuitry phase outage, and its contactor only plays the switching three phase mains when starting or stoping button pressing, and the protection motor exempts from and burns in the time of can not guaranteeing any phase circuit outage.Multiple motor protecter is arranged, and as patent 95220065, this protector is made up of analog element and relay, because the influence of analog element makes be affected the useful life of this protector.
Summary of the invention
The purpose of this utility model is to provide a kind of analog element that do not have, and is exclusively used in the phase failure protector of three-phase wye connection motor, to overcome the defective of above-mentioned protector.
The technical solution of the utility model is: three-phase wye connection motor phase failure protector comprises the contactor normally opened contact that is connected with the star-like motor power-supply wire of three-phase, the normally-closed contact of connect between the two-phase in the triple line of entering the contact of contactor normally opened contact stop button, contactor coil, self holding contact and relay; At the two ends that self-insurance is got an electric shock start button in parallel; Relay coil one end connects the neutral point of three-phase star connection motor, and the relay coil other end connects ground.
Owing to taked such scheme, just can remedy the deficiency of GPF (General Protection False, both ensured the electric current nonoverload in the power circuit; avoided three-phase wye connection motor because of appointing disconnected one electric mutually misfortune of being burnt again reliably, the electrical equipment original paper is few, no analog element; long service life, simple in structure.
Description of drawings
Accompanying drawing circuit structure diagrammatic sketch of the present utility model
Embodiment
As shown in drawings, stop button AT, contactor coil CJ and normally closed self holding contact CJ connect with relay normally-closed contact J, on the two ends of series connection are connected between A in the triple line of entering the contact of contactor normally-closed contact, the C two-phase.Start button AQ in the two ends parallel connection of wherein normally closed self holding contact CJ, coil J one end of relay connects the neutral point O of three-phase wye connection motor, another termination E.Selecting for use of contactor should conform to capacity with the voltage of three-phase wye connection motor, and selecting for use of relay should be 12 volts AC relay, can select JTX series.
The operation principle of this protector is: when the three phase mains circuit of three-phase wye connection motor and three-phase coil normally; three-phase wye connection motor runs well; the centerline voltage to earth of three-phase wye connection motor three-phase coil is the constant null value; the coil J of relay does not work, the operating circuit protection conducting of contactor.If have phase power circuit outage or motor one phase coil to open circuit, then the neutral point voltage to earth of three-phase wye connection motor three-phase coil just changes, cause relay work, inhale disconnected its normally-closed contact J, promptly interrupt the operating circuit of contactor CJ, make contactor CJ put disconnected self holding contact and three phase mains circuit, motor just shuts down, relay contact is closed again, but the self holding contact of contactor is disconnected.After fault is got rid of, press start button AQ, the running of motor restarting; If still have a circuitry phase fault; then because the neutral point of three-phase wye connection motor three-phase coil has a voltage to earth to impel relay work; the operating circuit of contactor just can't continue conducting; three-phase wye connection motor also just can not continuous running; loosen start shipment connect button after; three phase mains also just thoroughly cuts off, the purpose of protection three-phase wye connection motor when reaching the phase failure thus.
Claims (1)
1 one kinds of three-phase wye connection motor phase failure protectors, it comprises the contactor normally-closed contact that is connected with the star-like motor power-supply wire of three-phase, the contact of it is characterized in that connecting between the two-phase in the triple line of entering the contact of contactor normally-closed contact stop button, contactor coil, self holding contact and relay; At the two ends that self-insurance is got an electric shock start button in parallel; Relay coil one end connects the neutral point of three-phase star connection motor, and the relay coil other end connects ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290654 CN2591833Y (en) | 2002-12-26 | 2002-12-26 | Three phase star type connection motor defect phase protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290654 CN2591833Y (en) | 2002-12-26 | 2002-12-26 | Three phase star type connection motor defect phase protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2591833Y true CN2591833Y (en) | 2003-12-10 |
Family
ID=33749805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02290654 Expired - Fee Related CN2591833Y (en) | 2002-12-26 | 2002-12-26 | Three phase star type connection motor defect phase protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2591833Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151977A (en) * | 2011-12-06 | 2013-06-12 | 海德堡印刷机械股份公司 | Simplified electric brake device |
-
2002
- 2002-12-26 CN CN 02290654 patent/CN2591833Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151977A (en) * | 2011-12-06 | 2013-06-12 | 海德堡印刷机械股份公司 | Simplified electric brake device |
| CN103151977B (en) * | 2011-12-06 | 2017-08-29 | 海德堡印刷机械股份公司 | Simplified electric braking 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 |