CN208638019U - Threephase asynchronous open-phase protection circuit - Google Patents
Threephase asynchronous open-phase protection circuit Download PDFInfo
- Publication number
- CN208638019U CN208638019U CN201821121539.2U CN201821121539U CN208638019U CN 208638019 U CN208638019 U CN 208638019U CN 201821121539 U CN201821121539 U CN 201821121539U CN 208638019 U CN208638019 U CN 208638019U
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- China
- Prior art keywords
- phase
- threephase asynchronous
- contactor
- relay
- protection circuit
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Abstract
A kind of threephase asynchronous open-phase protection circuit, in the front end of the normally opened main contacts KM1-1 of A.C. contactor KM1, the normally opened auxiliary contact KM1-2 of start button SB1 and A.C. contactor KM1 carries out in parallel, then with stop button SB2, the normally-closed contact J1-1 of relay J1, it is connect between the V phase of threephase asynchronous and W phase respectively after the series connection of A.C. contactor KM1 coil, the anode of diode D1 connects the neutral point O of threephase asynchronous, one end of cathode contact relay J1 coil, it is grounded after the other end connection zero line interface N of relay J1 coil, the U phase of threephase asynchronous, V phase, fuse FU1 is serially connected in W phase respectively, FU2, motor M is connected after FU3.The phenomenon that the utility model structure is simple, and reaction is swift in motion, can be to avoid motor is burnt out due to phase shortage.
Description
Technical field
The utility model relates to a kind of open phase protection circuit for motor, specifically a kind of threephase asynchronous open-phase protection
Circuit belongs to motor security technology area.
Background technique
With data statistics is closed, the damage of threephase asynchronous has 80% or more to be because caused by phase-defect of motor.
If phase-deficient operation, the counter electromotive force higher than voltage rating can be generated at the both ends of disconnected phase winding, is endangered to caused by motor
It is far longer than overheat to harm caused by motor.Therefore, threephase asynchronous needs to install phase-lacking protective device, and should
Protective device should be able to snap action.Whether the method for phase shortage utilizes temperature sensor monitoring winding to traditional differentiation motor
Ramp case, but when due to phase-deficient operation, motor can be burnt in a short period of time, and temperature sensor may have little time instead
It answers, so whether the method for phase shortage is not avoided that motor is burnt to differentiation motor used at present.
Summary of the invention
In view of the above-mentioned problems of the prior art, the utility model provides a kind of threephase asynchronous open-phase protection electricity
The phenomenon that road, structure is simple, and reaction is swift in motion, can be to avoid motor is burnt out due to phase shortage.
To achieve the goals above, the utility model provides a kind of threephase asynchronous open-phase protection circuit, including two
Pole pipe D1, A.C. contactor KM1 and normally opened main contacts KM1-1, normally opened auxiliary contact KM1-2, relay J1 and normally closed touching
Point J1-1, start button SB1, stop button SB2, fuse FU1, FU2, FU3, in the normally opened main contacts of A.C. contactor KM1
The normally opened auxiliary contact KM1-2 of the front end of KM1-1, start button SB1 and A.C. contactor KM1 carry out it is in parallel, then with stopping
The V of threephase asynchronous is met after button SB2, the normally-closed contact J1-1 of relay J1, the series connection of A.C. contactor KM1 coil respectively
Mutually between W phase, the anode of diode D1 connects the neutral point O of threephase asynchronous, one end of cathode contact relay J1 coil,
It is grounded after the other end connection zero line interface N of relay J1 coil, the U phase of threephase asynchronous, V phase are concatenated respectively in W phase
Motor M is connected after having fuse FU1, FU2, FU3.
The A.C. contactor KM1 is 380V A.C. contactor as a further improvement of the utility model,.
The relay J1 is 220V DC relay as a further improvement of the utility model,.
The diode D1 is IN4007 rectifier diode as a further improvement of the utility model,.
Compared with prior art, the utility model structure is simple, easy to use, when in U, V, W of threephase asynchronous
The open circuit of any phase, the voltage-to-ground of neutral point O can increase, and relay J1 obtains electric actuation, and normally-closed contact J1-1 is disconnected,
A.C. contactor KM1 power loss, normally opened main contacts KM1-1 are disconnected, and motor M stops working to be protected.This is practical new
The phenomenon that type reaction is swift in motion, can be to avoid motor is burnt out due to phase shortage, is suitable for final stage switch-box or prime power distribution cabinet
It uses.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of threephase asynchronous open-phase protection circuit, including diode D1, A.C. contactor KM1 with
And normally opened main contacts KM1-1, normally opened auxiliary contact KM1-2, relay J1 and normally-closed contact J1-1, start button SB1, stop
Button SB2, fuse FU1, FU2, FU3, the A.C. contactor KM1 is 380V A.C. contactor, and relay J1 is that 220V is straight
Current relay, diode D1 are that IN4007 rectifier diode is opened in the front end of the normally opened main contacts KM1-1 of A.C. contactor KM1
The normally opened auxiliary contact KM1-2 of dynamic button SB1 and A.C. contactor KM1 carry out it is in parallel, then with stop button SB2, relay
Normally-closed contact J1-1, the A.C. contactor KM1 coil of J1 connects between the V phase of threephase asynchronous and W phase respectively after connecting, and two
The anode of pole pipe D1 connects the neutral point O of threephase asynchronous, one end of cathode contact relay J1 coil, relay J1 coil
Be grounded after other end connection zero line interface N, the U phase of threephase asynchronous, V phase, be serially connected in W phase respectively fuse FU1,
Motor M is connected after FU2, FU3.
The resistance value of these elements is common knowledge in Fig. 1, and those skilled in the art can according to need to each element
Parameter be adjusted.
The working principle of the utility model is as follows: as shown in Figure 1, after pressing start button SB1, A.C. contactor KM1
It is attracted, normally opened main contacts KM1-1 closure, threephase asynchronous work, while normally opened auxiliary contact KM1-2 closure completes route
It is self-locking.When threephase asynchronous works normally, the voltage-to-ground of neutral point O is approximately zero, and relay J1 is failure to actuate.And when three
Any phase open circuit in U, V, W of phase asynchronous motor, the voltage-to-ground of neutral point O can increase, and relay J1 obtains electric suction
It closes, normally-closed contact J1-1 is disconnected, A.C. contactor KM1 power loss, and normally opened main contacts KM1-1 is disconnected, and motor M stops working
To be protected.
Claims (4)
1. a kind of threephase asynchronous open-phase protection circuit, which is characterized in that including diode D1, A.C. contactor KM1 with
And normally opened main contacts KM1-1, normally opened auxiliary contact KM1-2, relay J1 and normally-closed contact J1-1, start button SB1, stop
Button SB2, fuse FU1, FU2, FU3, in the front end of the normally opened main contacts KM1-1 of A.C. contactor KM1, start button SB1
Carried out with the normally opened auxiliary contact KM1-2 of A.C. contactor KM1 it is in parallel, then with the normally closed touching of stop button SB2, relay J1
It is connect between the V phase of threephase asynchronous and W phase respectively after point J1-1, the series connection of A.C. contactor KM1 coil, diode D1 is just
Pole connects the neutral point O of threephase asynchronous, one end of cathode contact relay J1 coil, the other end connection of relay J1 coil
It is grounded after zero line interface N, the U phase of threephase asynchronous, V phase connect after being serially connected with fuse FU1, FU2, FU3 respectively in W phase
Meet motor M.
2. threephase asynchronous open-phase protection circuit according to claim 1, which is characterized in that the A.C. contactor
KM1 is 380V A.C. contactor.
3. threephase asynchronous open-phase protection circuit according to claim 1 or 2, which is characterized in that the relay
J1 is 220V DC relay.
4. threephase asynchronous open-phase protection circuit according to claim 1 or 2, which is characterized in that the diode
D1 is IN4007 rectifier diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821121539.2U CN208638019U (en) | 2018-07-16 | 2018-07-16 | Threephase asynchronous open-phase protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821121539.2U CN208638019U (en) | 2018-07-16 | 2018-07-16 | Threephase asynchronous open-phase protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208638019U true CN208638019U (en) | 2019-03-22 |
Family
ID=65738636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821121539.2U Expired - Fee Related CN208638019U (en) | 2018-07-16 | 2018-07-16 | Threephase asynchronous open-phase protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208638019U (en) |
-
2018
- 2018-07-16 CN CN201821121539.2U patent/CN208638019U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190322 Termination date: 20190716 |