CN201417935Y - Default phase overcurrent protection device for mini-type three-phase asynchronous motors - Google Patents
Default phase overcurrent protection device for mini-type three-phase asynchronous motors Download PDFInfo
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- CN201417935Y CN201417935Y CN2009201035290U CN200920103529U CN201417935Y CN 201417935 Y CN201417935 Y CN 201417935Y CN 2009201035290 U CN2009201035290 U CN 2009201035290U CN 200920103529 U CN200920103529 U CN 200920103529U CN 201417935 Y CN201417935 Y CN 201417935Y
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- binding post
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Abstract
A default phase overcurrent protection device for mini-type three-phase asynchronous motors belongs to the technical field of mechanical and electrical protection equipment, and aims to provide a safe, reliable, low-cost default phase overcurrent protection device for mini-type three-phase asynchronous motors. The device adopts the technical scheme that the device comprises a housing, manual resetting overcurrent protection switches, function and default phase indicator lights, incoming line connecting terminals and outgoing line connecting terminals, wherein the numbers of the manual resetting overcurrent protection switches and the function and default phase indicator lights are both three, the three manual resetting overcurrent protection switches are connected between the incoming lineconnecting terminal and the outgoing line connecting terminal of every single phase respectively, one ends of the three function and default phase indicator lights are connected between the incomingline connecting terminal and the outgoing line connecting terminal of every single phase respectively, and the other ends thereof are connected together. The device can provide prompt protection whenphase default occurs in a circuit, and the manual resetting is required, thereby achieving safety, reliability and low cost; and the device is particularly suitable for the popularization and application in medium and small sized enterprises and extensive rural areas.
Description
Technical field
The utility model relates to a kind of device that carries out overcurrent protection when being used for Small-Sized Three-Phase Induction generation open-phase fault, belongs to the mechanical and electrical protection equipment technical field.
Background technology
Threephase motor is widely used in industries such as mine, electromechanics, is the power producer of equipment such as water pump, fan, air compressor machine, elevator.Three-phase alternating current lacks for a long time a phase, gently then causes system works undesired, and is heavy then burn power consumption equipment (as transformer, threephase motor etc.).Just because this, the protection of three-phase alternating current phase shortage misphase is the emphasis of dynamo-electric department such as electric power system, mine system research always.
When symmetrical fault (as overload, stall, overvoltage, under-voltage etc.) appearred in motor, motor protector can detect the three-phase current maximum automatically, and compares with set point, when surpassing set point, by the operating characteristics of the setting tripping operation of threading off.And when unbalanced fault (as the phase failure, current imbalance etc.) appears in motor.The motor protector handle detects maximum and minimum value compares mutually; When difference (degree of unbalance) surpasses 50%, the motor protector action of in 1 second, threading off, like this no matter be the direct phase failure, the still transformer high-voltage side phase failure, the common bus phase failure during multiple motors parallel connection, the equal energy of motor winding inside phase failure reliably protecting.
In the protection process, forbid reclosing after automatically the circuit of control breaks down, just motor protector be used in the occasion of automatic control be do not allow automatically reset.At present, a lot of overcurrent protective devices can be directly used in automatic control loop, need not the manual adjustment reset mode, and this function is owing to adopt the intelligent solid-state relay peculiar, needs the equipment of control automatically as air compressor machine, water pump etc.But this device price is higher, and is less in the use of vast rural area, and adopts manual reseting device to have safe, reliable, cheap advantage, can extensively promote the use of.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of Small-Sized Three-Phase Induction over-current protection for the phase lacks device with safe, reliable, cheap advantage.
The technical scheme that solves the problems of the technologies described above is:
A kind of Small-Sized Three-Phase Induction over-current protection for the phase lacks device; it comprises shell, hand-reset overcurrent protection switch, operation and phase shortage indicator light, inlet wire binding post, outlet binding post; hand-reset overcurrent protection switch and operation and phase shortage indicator light are 3; 3 hand-reset overcurrent protection switches are connected on respectively between each single-phase inlet wire binding post and outlet binding post; 3 operations and an end of phase shortage indicator light are connected on respectively between each single-phase inlet wire binding post and outlet binding post, and the other end is connected together.
Adopt this design of mini threephase asynchronous over-current protection for the phase lacks device; when circuit generation open-phase fault, can in time protect; and must implement hand-reset, have safe, reliable, cheap advantage, be particularly suitable for promoting the use of in medium-sized and small enterprises and vast rural area.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model;
Fig. 2 is the utility model circuit diagram.
Mark is as follows among Fig. 1:
Mark is as follows among Fig. 2:
Single-phase 88 type hand-reset overcurrent protection switch FR1, FR2, FR3;
Operation and phase shortage indicator light HL1, HL2, HL3; Resistance R 1, R2, R3;
Inlet wire binding post A, B, C; Outlet binding post U, V, W
Embodiment
Show among Fig. 1 that the utility model is made up of shell 1, hand-reset overcurrent protection switch 2, operation and phase shortage indicator light 3, inlet wire binding post, outlet binding post.
Show among Fig. 2; present embodiment adopts single-phase 88 type hand-reset overcurrent protection switches; hand-reset overcurrent protection switch is 3, and 3 single-phase 88 type hand-reset overcurrent protection switch FR1, FR2, FR3 are connected on respectively between each single-phase inlet wire binding post A, B, C and outlet binding post U, V, the W.
3 operations of present embodiment employing and phase shortage indicator light HL1, HL2, HL3, their end is connected on respectively between each single-phase inlet wire binding post A, B, C and outlet binding post U, V, the W, the other end is connected together, and also is connected to resistance R 1, R2, R3 respectively in the side of each operation and phase shortage indicator light HL1, HL2, HL3.
In Small-Sized Three-Phase Induction puts into operation, during owing to the unexpected generation phase failure, stall, cause the circuit phase current excessive, when its overrate, this device can move rapidly, in time cuts off the electricity supply, and makes motor out of service, thereby is effectively protected.At this moment the reset button of the hand-reset overcurrent protection switch 2 on the shell 1 of this device can pop up, and operation and phase shortage indicator light 3 can demonstrate the phase place of the phase failure simultaneously.After fault was got rid of, circuit normally need manually to recover, the reset button of pressing the hand-reset overcurrent protection switch 2 on the lower casing 1, and motor can be reset and put into operation.
The utility model range of application is comparatively extensive, goes for the Small-Sized Three-Phase Induction of 100W-4000W, dry type, wet type, submersible type all can, frequency 50Hz, voltage 220V, 380V.
Claims (1)
1. Small-Sized Three-Phase Induction over-current protection for the phase lacks device; it is characterized in that: it comprises shell [1]; hand-reset overcurrent protection switch [2]; operation and phase shortage indicator light [3]; the inlet wire binding post; the outlet binding post; hand-reset overcurrent protection switch [2] and operation and phase shortage indicator light [3] are 3; 3 hand-reset overcurrent protection switches [2] are connected on respectively between each single-phase inlet wire binding post and outlet binding post; 3 operations and an end of phase shortage indicator light [3] are connected on respectively between each single-phase inlet wire binding post and outlet binding post, and the other end is connected together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201035290U CN201417935Y (en) | 2009-07-02 | 2009-07-02 | Default phase overcurrent protection device for mini-type three-phase asynchronous motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201035290U CN201417935Y (en) | 2009-07-02 | 2009-07-02 | Default phase overcurrent protection device for mini-type three-phase asynchronous motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201417935Y true CN201417935Y (en) | 2010-03-03 |
Family
ID=41794364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201035290U Expired - Fee Related CN201417935Y (en) | 2009-07-02 | 2009-07-02 | Default phase overcurrent protection device for mini-type three-phase asynchronous motors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201417935Y (en) |
-
2009
- 2009-07-02 CN CN2009201035290U patent/CN201417935Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100303 Termination date: 20120702 |