CN203326574U - Three-phase motor open-phase protective device - Google Patents
Three-phase motor open-phase protective device Download PDFInfo
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- CN203326574U CN203326574U CN2013204454377U CN201320445437U CN203326574U CN 203326574 U CN203326574 U CN 203326574U CN 2013204454377 U CN2013204454377 U CN 2013204454377U CN 201320445437 U CN201320445437 U CN 201320445437U CN 203326574 U CN203326574 U CN 203326574U
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Abstract
The utility model discloses a three-phase motor open-phase protective device which is characterized by comprising a three-phase AC power supply, a three-phase electric air switch KQ, an intermediate relay J, an AC contactor K, a normally closed type key switch AN1, a normally open type key switch AN2 and a three-phase motor M. When a three-phase motor is operated at an open-phase state, if current surpasses a normal value, the winding of the three-phase motor is burned down due to overheating. Production practices reveal that accidents that the three-phase motor is burned down are mostly caused by being operated at the open-phase state. In order to prevent the three-phase motor from being operated at the open-phase state, supervision and inspection during operation are reinforced on one hand; and on the other hand, appropriate technical measures are adopted to protect the three-phase motor. The three-phase motor open-phase protective device can effectively protect the three-phase motor. The circuit of the three-phase motor open-phase protective device has advantages of being simple and reliable, low in manufacturing cost, easy to popularize, etc.
Description
Technical field
The utility model belongs to the electron controls technology field, relates to a kind of phase failure protection for three-phase motor.
Background technology
Threephase motor lacks one and can't normally start mutually, but threephase motor is in operation, a scarce phase still can be moved, or the winding of threephase motor breaks one group, the three-phase motor open-phase operation is caused in capital, phenomenon is the threephase motor heating, rotating speed descends, cacophonia, and the time has been grown threephase motor and will burn.Threephase motor is in operation, and wherein a phase line broken string, be called open-phase running.Threephase motor is in phase-deficient operation, and electric current will surpass normal value, and the threephase motor winding will be burnt because of overheated.Burn out the accident majority of threephase motor because phase-deficient operation causes.Why three-phase motor open-phase operation meeting burnt as: when a certain phase fuse opening of the motor of delta connection, the threephase motor stator winding is divided into two-way, and a road only has a phase winding.While only having the current ratio three-phase operation in a phase winding loop, greatly increase, so at first this phase winding will inevitably burn out.While opening the inspection of threephase motor end cap, if see a phase winding to burn, another two phase windings are intact, are exactly the consequence that the operation of delta connection three-phase motor open-phase causes; For another example: the star-star connection threephase motor one mutually the outage after, other two phase winding is series connection, applied voltage is 380V, the voltage of every phase winding drops to 190V from original 220V, if the bearing power of threephase motor is constant, the electric current of two-phase stator winding will exceed normal value, under nominal load, approximately than rated current large 1.732 times, the electric current of threephase motor when phase-deficient operation, this electric current can make stator winding overheated so that burn.Open the inspection of threephase motor end cap, if two phase windings burn, a phase winding is intact, is exactly the result that phase-deficient operation causes.
In order to prevent the three-phase motor open-phase operation, the one, strengthen operating supervision and inspection; The 2nd, should take suitable technical measures to be protected.Phase failure protection for three-phase motor described in the utility model can effectively be protected threephase motor, and that its circuit has is simple and reliable, cost of manufacture is low, the easy advantage such as universal.
Below describe phase failure protection for three-phase motor described in the utility model related relevant technologies content in implementation process in detail.
The utility model content
Goal of the invention and beneficial effect: threephase motor is in phase-deficient operation, and electric current will surpass normal value, and the threephase motor winding will be burnt because of overheated.Production practices show to burn out the accident majority of threephase motor because phase-deficient operation causes.In order to prevent the three-phase motor open-phase operation, the one, strengthen operating supervision and inspection; The 2nd, should take suitable technical measures to be protected.Phase failure protection for three-phase motor described in the utility model can effectively be protected threephase motor, and that its circuit has is simple and reliable, cost of manufacture is low, the easy advantage such as universal.
Circuit working principle: after the three-phase electricity air switch that closes, after pressing key switch AN2, auxiliary relay J adhesive, auxiliary relay J normally opened contact J-1 self-locking, then A.C. contactor K coil obtains electric, its 4 groups of normally opened contact K-1, K-2, K-3 and K-4 are all closed, and threephase motor is connected the three-phase alternating-current supply normal operation.If during A phase factor fault phase shortage, the coil losing electricity of A.C. contactor K, make 4 groups of normally opened contacts of A.C. contactor K all disconnect.If when B phase or C phase phase shortage, auxiliary relay J coil and A.C. contactor K coil while dead electricity, make normally opened contacts all in circuit all disconnect, and played the effect of duplicate protection threephase motor.The switch that key switch AN1 is normally-closed contact, use while being mainly used in shutting down.
Technical scheme: phase failure protection for three-phase motor, it comprises three-phase alternating-current supply, three-phase electricity air switch KQ, auxiliary relay J, A.C. contactor K, normally closed type key switch AN1, key switch AN2 open in usual and threephase motor M, it is characterized in that:
Three-phase electricity air switch KQ is serially connected with respectively in three-phase alternating-current supply, the A phase line of three-phase alternating-current supply, B phase line, C phase line connect respectively the moving contact of A.C. contactor K normally opened contact K-1, K-2, K-3, and the fixed contact of A.C. contactor K normally opened contact K-1, K-2, K-3 is connected to respectively threephase motor M;
The B phase line of one termination three-phase alternating-current supply of auxiliary relay J coil, the C phase line of another termination three-phase alternating-current supply of auxiliary relay J coil, the normally opened contact J-1 fixed contact of auxiliary relay J connects the C phase line of three-phase alternating-current supply, the normally opened contact J-1 moving contact of auxiliary relay J connects an end of A.C. contactor K coil, the end of another termination key switch AN2 open in usual of A.C. contactor K coil and the fixed contact of A.C. contactor normally opened contact K-4, the moving contact of the other end of key switch AN2 open in usual and A.C. contactor normally opened contact K-4 connects the end of normally closed type key switch AN1, the A phase line of another termination three-phase alternating-current supply of normally closed type key switch AN1.
The accompanying drawing explanation
Embodiment
According to the phase failure protection for three-phase motor circuit working schematic diagram shown in accompanying drawing 1 and accompanying drawing explanation; and according to annexation between components and parts in the described each several part circuit of utility model content; and the components and parts technical parameter described in execution mode requires and the circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.
The selection of components and parts and technical parameter thereof
KQ is the three-phase electricity air switch, and the parameter of air switch is determined according to load;
J is auxiliary relay, and coil voltage is 380V, and J-1 is normally opened contact;
K is A.C. contactor, and coil voltage is 380V, requires A.C. contactor that 4 groups of normally opened contacts are arranged, and the power of the normally opened contact of A.C. contactor is determined by load;
AN1 is the normally closed type key switch;
AN2 is key switch open in usual.
Circuit production main points and circuit debugging
The circuit structure of three characteristics of the middle term loss-of-phase protection arrangement is fairly simple; as long as the electronic devices and components performance of generally selecting is intact; and the components and parts annexation in accompanying drawing 1 is welded to specifications; physical connection line and welding quality are after careful inspection is correct, and circuit of the present utility model does not substantially need to carry out any debugging and can work.
Claims (1)
1. a phase failure protection for three-phase motor, it comprises three-phase alternating-current supply, three-phase electricity air switch KQ, auxiliary relay J, A.C. contactor K, normally closed type key switch AN1, key switch AN2 open in usual and threephase motor M, it is characterized in that:
Described three-phase electricity air switch KQ is serially connected with respectively in three-phase alternating-current supply, the A phase line of three-phase alternating-current supply, B phase line, C phase line connect respectively the moving contact of A.C. contactor K normally opened contact K-1, K-2, K-3, and the fixed contact of A.C. contactor K normally opened contact K-1, K-2, K-3 is connected to respectively threephase motor M;
The B phase line of one termination three-phase alternating-current supply of described auxiliary relay J coil, the C phase line of another termination three-phase alternating-current supply of auxiliary relay J coil, the normally opened contact J-1 fixed contact of auxiliary relay J connects the C phase line of three-phase alternating-current supply, the normally opened contact J-1 moving contact of auxiliary relay J connects an end of A.C. contactor K coil, the end of another termination key switch AN2 open in usual of A.C. contactor K coil and the fixed contact of A.C. contactor normally opened contact K-4, the moving contact of the other end of key switch AN2 open in usual and A.C. contactor normally opened contact K-4 connects the end of normally closed type key switch AN1, the A phase line of another termination three-phase alternating-current supply of normally closed type key switch AN1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204454377U CN203326574U (en) | 2013-07-25 | 2013-07-25 | Three-phase motor open-phase protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204454377U CN203326574U (en) | 2013-07-25 | 2013-07-25 | Three-phase motor open-phase protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203326574U true CN203326574U (en) | 2013-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204454377U Expired - Fee Related CN203326574U (en) | 2013-07-25 | 2013-07-25 | Three-phase motor open-phase protective device |
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| CN (1) | CN203326574U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354348A (en) * | 2013-07-25 | 2013-10-16 | 吴建堂 | Open-phase protection apparatus for three-phase motor |
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2013
- 2013-07-25 CN CN2013204454377U patent/CN203326574U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354348A (en) * | 2013-07-25 | 2013-10-16 | 吴建堂 | Open-phase protection apparatus for three-phase motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20140725 |
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| EXPY | Termination of patent right or utility model |