CN2105131U - Protector for phase loss, overvoltage and undervltage of 3-phase motor - Google Patents
Protector for phase loss, overvoltage and undervltage of 3-phase motor Download PDFInfo
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- CN2105131U CN2105131U CN 91221103 CN91221103U CN2105131U CN 2105131 U CN2105131 U CN 2105131U CN 91221103 CN91221103 CN 91221103 CN 91221103 U CN91221103 U CN 91221103U CN 2105131 U CN2105131 U CN 2105131U
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- capacitor
- negative pole
- connect
- phase
- voltage
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Abstract
The utility model relates to a protector for phase loss, overvoltage and under-voltage of a three-phase motor, which comprises a power circuit, a control circuit and an installation box. The protector for phase loss, overvoltage and under-voltage of a three-phase motor is characterized in that the control circuit is composed of a phase interruption control unit, an under-voltage control unit and an overvoltage control unit. The variable-over current takes the voltage variation of an electric network as a control signal source, which is not limited by the power value of the motor. The utility model is suitable for the protection of phase interruption, overvoltage and under voltage of all three-phase motors, and the working voltage range is large. The protector for phase loss, overvoltage and under-voltage of a three-phase motor can work reliably within 320V-420V, and the installation of the utility model is simple and convenient.
Description
The utility model relates to a kind of threephase motor emergency protective circuit device.
In order to solve, in the existing threephase motor open phase protection, there are under current relay protection, residual voltage relay protection and the filament voltage relay protection that continues several owing to the power supply phase shortage burns out the threephase motor problem.The under current relay protection, it is reliable to work, and has overcurrent protection, but can only be supporting by the motor model, can not be general, be not suitable for the excessive motor of small-power or power.Residual voltage relay protection then its relay working voltage codomain limitation is bigger, need increase part to the motor of triangular form connection, sets up artificial asterism, is not suitable in the three-phase three-wire system power supply network.The versatility of fracture of wire voltage relay protective device is better, but three relays need be housed, and the contact is more, easy break-down on the control circuit, cost height.
The purpose of this utility model provides a kind ofly can be common to all threephase motors, be suitable for that voltage range is big, working stability reliable, the threephase motor phase failure simply and easily, overvoltage, under-voltage protection device are installed.
The threephase motor phase failure of the present utility model, overvoltage, under-voltage protection device comprise power circuit, control circuit and mounting box, it is characterized in that control circuit is made up of the phase failure, under-voltage control unit and overvoltage control unit.
Accompanying drawing 1 is the utility model structural representation.
Accompanying drawing 2 is the utility model circuit theory diagrams.
Accompanying drawing 3 is the utility model printed circuit board (PCB).
, now in conjunction with the accompanying drawings the utility model is made detailed description.
Power circuit comprises transformer B, rectifier diode D
1, D
3, D
5With capacitor C
1Rectifier diode D
1, D
3, D
5Positive pole be connected D with the secondary output end of transformer B respectively
1, D
3, D
5Negative pole and capacitor C
1Anodal and meet C
1Negative pole and the neutral point of transformer B time level is connected, the elementary input of transformer B is connected in the former three-phase circuit of the normally opened contact of motor main circuit power supply A.C. contactor CJ, wherein D
1, D
3, D
5Select 2CP for use
11, C
1Be 100uF/50V.Control circuit is made up of the phase failure, under-voltage control unit and overvoltage control unit.The phase failure, under-voltage control unit comprise by crystal diode D
2, D
4, D
6, resistance R
1, R
2, R
3, R
4, R
5, R
6, capacitor C
2, C
3, C
4The input part of forming is by crystal diode D
7, D
8, D
9The control section of composition and door is by transistor BG
1, voltage stabilizing didoe CW
1, relay J
1, resistance R
7, semifixed resistor W
1The control operating part of forming.Crystal diode D
2, D
4, D
6Positive pole respectively with rectifier diode D
1, D
3, D
5Positive pole connect.Resistance R
1, R
2Earlier after the serial connection again with capacitor C
2And connect, meet capacitor C
2Anodal an end and crystal diode D
6Negative pole connect, the other end connects capacitor C
1Negative pole; Resistance R
3, R
4Earlier after the serial connection again with capacitor C
3And connect, meet capacitor C
3Anodal an end and crystal diode D
4Negative pole connect, the other end connects capacitor C
1Negative pole; Resistance R
5, R
6Earlier after the serial connection again with capacitor C
4And connect, meet capacitor C
4Anodal an end and crystal diode D
2Negative pole connect, the other end connects capacitor C
1Negative pole.Crystal diode D
7, D
8, D
9Negative pole connect resistance R respectively
5, R
6Tie point, R
3, R
4Tie point and R
1, R
2Tie point; D
7, D
8, D
9Positive pole, semifixed resistor W
1An end and transistor BG
1Base stage and meet semifixed resistor W
1Other end series resistor R
7The back connects rectifier diode D
1Negative pole; Transistor BG
1Emitter connect voltage stabilizing didoe CW
1Negative pole, CW
1Positive pole connect capacitor C
1Negative pole; Transistor BG
1Collector series relay J
1Coil after with rectifier diode D
1Negative pole connect.Crystal diode D wherein
2, D
4, D
6, D
7, D
8, D
9All select 2CP for use
11, resistance R
1=R
3=R
5=2K Ω, R
2=R
4=R
6=1.1K Ω, R
7=3.3K Ω, semifixed resistor W
1=6.8K Ω, capacitor C
2, C
3, C
4Be 47uF/50V, transistor BG
1Be 3DK4B, voltage stabilizing didoe CW
1Be 2CW21A.The overvoltage control unit comprises transistor BG
2, crystal diode D
10, relay J
2, capacitor C
5, resistance R
8, semifixed resistor W
2Crystal diode D
10Positive pole be connected in series semifixed resistor W successively
2, resistance R
8After, R
8The other end connect rectifier diode D
1Negative pole, D
10Negative pole connect capacitor C
1Negative pole; Transistor BG
2Base stage connect R
8With W
2Tie point, BG
2Emitter connect capacitor C
1Negative pole, BG
2Collector series relay J
2Coil and capacitor C
5Parallel branch after with rectifier diode D
1Negative pole connect.R wherein
8=5.1K Ω, W
2=680 Ω, BG
2Select 3DK4B for use, D
10Be 2AP9.Relay J
1Normally opened contact J
1-1, J
2Normally-closed contact J
2-1Behind A.C. contactor CJ coil tandem in the motor switch circuit, be attempted by in the two-phase circuit before the normally opened contact of motor main circuit power supply A.C. contactor CJ.Each electronic component is fixed on the mounting box base plate after pressing and welding well shown in accompanying drawing 3, the accompanying drawing 1, again lid is covered and is fixed on the base plate, draws power input line and control output line from the side.
Three phase mains just often, crystal diode D
7, D
8, D
9All end transistor BG
1Conducting, relay J
1Adhesive, normally opened contact J
1-1Closure, A.C. contactor CJ adhesive, its normally opened contact closure, and make motor work.When three phase mains breaks any phase time, the crystal diode conducting in corresponding and the door, transistor BG
1Then become and end relay J by conducting
1Discharge normally opened contact J
1-1Disconnect, A.C. contactor CJ discharges, and its normally opened contact disconnects, thereby has protected motor.Adjust semifixed resistor W
1Can change transistor BG
1The starting voltage of conducting makes when supply voltage is lower than certain value BG
1Not conducting, motor is not worked, so have the under-voltage protection effect.When supply voltage is too high, transistor BG
2Conducting, relay J
2Adhesive, normally-closed contact J
2-1Disconnect, A.C. contactor CJ discharges, and its normally opened contact disconnects, and motor is not worked, and plays the overvoltage protection effect.And when supply voltage is lower than certain value and is in the normal working voltage scope, transistor BG
2End relay J
2Not adhesive, motor is in normal operating conditions.The high-voltage value of overvoltage protection can be by adjusting semifixed resistor W
2Change.Because voltage stabilizing didoe CW
1, crystal diode D
10To transistor BG
1, BG
2Temperature compensation function, so working stability is reliable.
The utility model is owing to adopt above design, become overcurrent and with grid voltage change as the control signal source, be not subjected to the restriction of motor power (output) size, be applicable to the phase failure, overvoltage, under-voltage protection to all threephase motors; Operating voltage range is big, can be in 320V-420V reliably working; Install simple and convenient.
Claims (1)
1, a kind of threephase motor phase failure, overvoltage, under-voltage protection device, it comprises power circuit, control circuit and mounting box, power circuit is by transformer B, rectifier diode D
1, D
3, D
5With capacitor C
1Form rectifier diode D
1, D
3, D
5Positive pole be connected D with the secondary output end of transformer B respectively
1, D
3, D
5Negative pole and capacitor C
1Anodal and meet C
1Negative pole and the neutral point of transformer B time level be connected, the elementary input of transformer B is connected in the normally opened contact three-phase circuit in the past of motor main circuit power supply A.C. contactor CJ, feature of the present utility model is that its control circuit is made up of the phase failure, under-voltage control unit and overvoltage control unit, and the phase failure, under-voltage control unit comprise by crystal diode D
2, D
4, D
6, resistance R
1, R
2, R
3, R
4, R
5, R
6, capacitor C
2, C
3, C
4The input part of forming is by crystal diode D
7, D
8, D
9The control section of composition and door is by transistor BG
1, voltage stabilizing didoe CW
1, relay J
1, resistance R
7, semifixed resistor W
1The control operating part of forming, crystal diode D
2, D
4, D
6Positive pole respectively with rectifier diode D
1, D
3, D
5Positive pole connect resistance R
1, R
2Earlier after the serial connection again with capacitor C
2And connect, meet capacitor C
2Anodal an end and crystal diode D
6Negative pole connect, the other end connects capacitor C
1Negative pole, resistance R
3, R
4Earlier after the serial connection again with capacitor C
1And connect, meet capacitor C
3Anodal an end and crystal diode D
4Negative pole connect, the other end connects capacitor C
1Negative pole, resistance R
5, R
6Earlier after the serial connection again with capacitor C
4And connect, meet capacitor C
4Anodal an end and crystal diode D
2Negative pole connect, the other end connects capacitor C
1Negative pole, crystal diode D
7, D
8, D
9Negative pole connect resistance R respectively
5, R
6Tie point R
3, R
4Tie point and R
1, R
2Tie point, D
7, D
8, D
9Positive pole, semifixed resistor W
1An end and transistor BG
1Base stage and meet semifixed resistor W
1Other end series resistor R
7The back connects rectifier diode D
1Negative pole, transistor BG
1Emitter connect voltage stabilizing didoe CW
1Negative pole, CW
1Positive pole connect capacitor C
1Negative pole, transistor BG
1Collector series relay J
1Coil after with rectifier diode D
1Negative pole connect, the overvoltage control unit comprises transistor BG
2, crystal diode D
10, relay J
2, capacitor C
5, resistance R
6, semifixed resistor W
2, crystal diode D
10Positive pole be connected in series semifixed resistor W successively
2, resistance R
8After, R
8The other end connect rectifier diode D
1Negative pole, D
10Negative pole connect capacitor C
1Negative pole, transistor BG
2Base stage connect R
3With W
2Tie point, BG
2Emitter connect capacitor C
1Negative pole, BG
2Collector series relay J
2Coil and capacitor C
5Parallel branch after rectifier diode D
1Negative pole connect relay J
1Normally opened contact J
1-1, J
2Normally-closed contact J
2-1After connecing with A.C. contactor CJ line in the motor switch circuit, be attempted by in the normally opened contact two-phase circuit in the past of motor main circuit power supply A.C. contactor CJ, after each electronic component welds, be fixed on the mounting box base plate, lid is covered and is fixed on the base plate again, draw power input line and control output line from the side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221103 CN2105131U (en) | 1991-11-02 | 1991-11-02 | Protector for phase loss, overvoltage and undervltage of 3-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221103 CN2105131U (en) | 1991-11-02 | 1991-11-02 | Protector for phase loss, overvoltage and undervltage of 3-phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2105131U true CN2105131U (en) | 1992-05-20 |
Family
ID=4928125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91221103 Granted CN2105131U (en) | 1991-11-02 | 1991-11-02 | Protector for phase loss, overvoltage and undervltage of 3-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2105131U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347942C (en) * | 2003-02-14 | 2007-11-07 | 三星电子株式会社 | Motor power supply |
| CN100440668C (en) * | 2004-04-14 | 2008-12-03 | 余彦中 | Output circuit device of self-controlled breaking protective signal relay |
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
| CN106374425A (en) * | 2016-10-12 | 2017-02-01 | 长沙群瑞电子科技有限公司 | Undervoltage protection circuit of three-phase power supply |
| CN112054663A (en) * | 2020-07-23 | 2020-12-08 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
-
1991
- 1991-11-02 CN CN 91221103 patent/CN2105131U/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477436C (en) * | 2001-10-12 | 2009-04-08 | 余彦中 | Phase fault, low-voltage and over voltage breaking protection circuit |
| CN100347942C (en) * | 2003-02-14 | 2007-11-07 | 三星电子株式会社 | Motor power supply |
| CN100440668C (en) * | 2004-04-14 | 2008-12-03 | 余彦中 | Output circuit device of self-controlled breaking protective signal relay |
| CN106374425A (en) * | 2016-10-12 | 2017-02-01 | 长沙群瑞电子科技有限公司 | Undervoltage protection circuit of three-phase power supply |
| CN112054663A (en) * | 2020-07-23 | 2020-12-08 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
| CN112054663B (en) * | 2020-07-23 | 2022-03-04 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |