CN203434599U - Three-phase power supply open-phase protective device - Google Patents
Three-phase power supply open-phase protective device Download PDFInfo
- Publication number
- CN203434599U CN203434599U CN201320495561.4U CN201320495561U CN203434599U CN 203434599 U CN203434599 U CN 203434599U CN 201320495561 U CN201320495561 U CN 201320495561U CN 203434599 U CN203434599 U CN 203434599U
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- phase
- contactor
- air switch
- power supply
- protective device
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Abstract
Disclosed is a three-phase power supply open-phase protective device. The three-phase power supply open-phase protective device comprises a three-phase air switch QF, a stop button SB1, a self-locking starting button SB2 and a three-phase AC contactor KM. Static contacts of the three-phase air switch QF are reserved to be connected with an A phase, a B phase and a C phase of a three-phase power supply; moving contacts of the three-phase air switch QF are connected with ends of three contacts of the three-phase AC contactor KM, and the other ends of the three-phase AC contactor KM are reserved to be connected with a three-phase electrical appliance; and the stop button SB1, the self-locking starting button SB2 and a coil of the three-phase AC contactor KM are connected in series to form a control loop, and the control loop is in a parallel-connection relationship with wires, corresponding to the A phase and the C phase of the three-phase power supply, between the three-phase air switch QF and the three-phase AC contactor KM. The three-phase power supply open-phase protective device further comprises an intermediate relay KA; a coil of the intermediate relay KA is in a parallel-connection relationship with wires, corresponding to the B phase and the C phase of the three-phase power supply, between the three-phase air switch QF and the three-phase AC contactor KM; and contacts of the intermediate relay KA are connected on the control loop in series.
Description
Technical field
The utility model relates to a kind of appliance controller, especially a kind of open phases of three-phase power source protective device.
Background technology
In productive power Maintenance Practice, often run into a fall insurance of high voltage side of transformer, can cause because of various reasons certain to burn mutually situation about falling, this situation can not cause too much influence to illumination and some single-phase electric devices, but just different to the operation of three-phase power-equipment, particularly three motor, if can not stop in time, will cause burn-down of electric motor because of single-phase operation.Larger equipment, stops production because burn-down of electric motor causes to stop transport, again because repairing and changing and caused larger time waste and economic loss.At present, in threephase asynchronous controlling run, more than 95 percent equipment control circuit is two-phase protection, and other one breaks down mutually moves motor is exactly maximum hidden danger.Eliminating this phenomenon and occur, is exactly when this thing happens, to guarantee that motor can stop in time at mains side, eliminates individual event running.Therefore, designing a kind of open phases of three-phase power source protective device, is the current technical issues that need to address.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of open phases of three-phase power source protective device.
The technical scheme in the invention for solving the technical problem is:
Open phases of three-phase power source protective device, comprise three-phase air switch QF, stop button SB1, self-locking start button SB2 and three-phase ac contactor KM, the reserved three phase mains A that connects of fixed contact of three-phase air switch QF, B, C phase, the moving contact of three-phase air switch QF connects respectively one end of three contacts of three-phase ac contactor KM, the reserved three-phase electric apparatus that connects of the other end of three contacts of three-phase ac contactor KM, stop button SB1, the control loop forming after the coil series connection of self-locking start button SB2 and three-phase ac contactor KM be connected in parallel between three-phase air switch QF and three-phase ac contactor KM with three phase mains A, on the corresponding wire of C, it is characterized in that, also comprise auxiliary relay KA, the coils from parallel connection of coils of auxiliary relay KA between three-phase air switch QF and three-phase ac contactor KM with three phase mains B, on the corresponding wire of C, the contact of auxiliary relay KA is connected on above-mentioned control loop.
Principle of the present utility model:
The three-phase air switch QF that closes, auxiliary relay KA adhesive.Press self-locking start button SB2, SBS self-locking, A.C. contactor KM closes, if A phase factor fault phase shortage, A.C. contactor KM coil losing electricity, and A.C. contactor KM disconnects; If B phase or C phase phase shortage, the coil of auxiliary relay KA and A.C. contactor KM dead electricity simultaneously, A.C. contactor disconnects, and auxiliary relay KA and A.C. contactor KM disconnect simultaneously, play double protection.
Compared with prior art, the utility model circuit is simple, reliable, assembly is easily purchased, cost is low, can effectively protect three phase electric equipment, has thoroughly done away with the generation that causes burn-down of electric motor fault because of power supply lacuna.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in the figure, open phases of three-phase power source protective device, comprise three-phase air switch QF, stop button SB1, self-locking start button SB2 and three-phase ac contactor KM, the reserved three phase mains A that connects of fixed contact of three-phase air switch QF, B, C phase, the moving contact of three-phase air switch QF connects respectively one end of three contacts of three-phase ac contactor KM, the reserved three-phase electric apparatus that connects of the other end of three contacts of three-phase ac contactor KM, stop button SB1, the control loop forming after the coil series connection of self-locking start button SB2 and three-phase ac contactor KM be connected in parallel between three-phase air switch QF and three-phase ac contactor KM with three phase mains A, on the corresponding wire of C, it is characterized in that, also comprise auxiliary relay KA, the coils from parallel connection of coils of auxiliary relay KA between three-phase air switch QF and three-phase ac contactor KM with three phase mains B, on the corresponding wire of C, the contact of auxiliary relay KA is connected on above-mentioned control loop.
Claims (1)
1. open phases of three-phase power source protective device, comprise three-phase air switch QF, stop button SB1, self-locking start button SB2 and three-phase ac contactor KM, the reserved three phase mains A that connects of fixed contact of three-phase air switch QF, B, C phase, the moving contact of three-phase air switch QF connects respectively one end of three contacts of three-phase ac contactor KM, the reserved three-phase electric apparatus that connects of the other end of three contacts of three-phase ac contactor KM, stop button SB1, the control loop forming after the coil series connection of self-locking start button SB2 and three-phase ac contactor KM be connected in parallel between three-phase air switch QF and three-phase ac contactor KM with three phase mains A, on the corresponding wire of C, it is characterized in that, also comprise auxiliary relay KA, the coils from parallel connection of coils of auxiliary relay KA between three-phase air switch QF and three-phase ac contactor KM with three phase mains B, on the corresponding wire of C, the contact of auxiliary relay KA is connected on above-mentioned control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320495561.4U CN203434599U (en) | 2013-08-14 | 2013-08-14 | Three-phase power supply open-phase protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320495561.4U CN203434599U (en) | 2013-08-14 | 2013-08-14 | Three-phase power supply open-phase protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203434599U true CN203434599U (en) | 2014-02-12 |
Family
ID=50063617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320495561.4U Expired - Fee Related CN203434599U (en) | 2013-08-14 | 2013-08-14 | Three-phase power supply open-phase protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203434599U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071340A (en) * | 2015-08-05 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Power phase failure protection apparatus |
-
2013
- 2013-08-14 CN CN201320495561.4U patent/CN203434599U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071340A (en) * | 2015-08-05 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Power phase failure protection apparatus |
| CN105071340B (en) * | 2015-08-05 | 2017-12-01 | 山西太钢不锈钢股份有限公司 | A kind of protection device of power phase shortage |
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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: 20140212 Termination date: 20140814 |
|
| EXPY | Termination of patent right or utility model |