CN203747384U - A three-phase motor phase loss protection device - Google Patents
A three-phase motor phase loss protection device Download PDFInfo
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- CN203747384U CN203747384U CN201420022427.7U CN201420022427U CN203747384U CN 203747384 U CN203747384 U CN 203747384U CN 201420022427 U CN201420022427 U CN 201420022427U CN 203747384 U CN203747384 U CN 203747384U
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- phase
- auxiliary contactor
- voltage transformer
- contactor coil
- auxiliary
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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Abstract
本实用新型涉及一种三相电机缺相保护装置，属于三相电机保护技术领域。本实用新型包括三相电线、主接触器触点KM、电压互感器TVa、电压互感器TVc、辅接触器线圈KMa、辅接触器线圈KMc、辅接触器线圈KMb、辅接触器触点KMa、辅接触器触点KMb、辅接触器触点KMc、主接触器线圈KM；其中主接触器触点KM串接入三相电线中，电压互感器TVa与A相相连，电压互感器TVc与C相相连，辅接触器线圈KMa与电压互感器TVa串联，辅接触器线圈KMc与电压互感器TVc串联，辅接触器线圈KMa和辅接触器线圈KMc与辅接触器线圈KMb相连。本实用新型能够保护三相电机避免出现缺相事故带来的损坏；结构简单，操作方便。
The utility model relates to a phase loss protection device for a three-phase motor, which belongs to the technical field of three-phase motor protection. The utility model includes three-phase electric wire, main contactor contact KM, voltage transformer TVa, voltage transformer TVc, auxiliary contactor coil KMa, auxiliary contactor coil KMc, auxiliary contactor coil KMb, auxiliary contactor contact KMa, The auxiliary contactor contact KMb, the auxiliary contactor contact KMc, and the main contactor coil KM; the main contactor contact KM is connected in series to the three-phase wire, the voltage transformer TVa is connected to the A phase, and the voltage transformer TVc is connected to the C phase The auxiliary contactor coil KMa is connected in series with the voltage transformer TVa, the auxiliary contactor coil KMc is connected in series with the voltage transformer TVc, and the auxiliary contactor coil KMa and the auxiliary contactor coil KMc are connected with the auxiliary contactor coil KMb. The utility model can protect the three-phase motor from damage caused by a phase loss accident; the utility model has simple structure and convenient operation.
Description
Technical field
The utility model relates to a kind of phase-defect, belongs to three phase electric machine resist technology field.
Background technology
Three-phase electric motor phase protection fault is to cause one of common cause that three phase electric machine burns.At present, generally adopt thermal overload relay protection, this kind of protection is the principle of having utilized bimetal leaf to thread off in adstante febre distortion, and its drop-away time and size of current have much relations.Because the actual load of industrial motor often only has the 60%-70% of rated power, in phase shortage in such cases, its phase-deficient operation electric current often can not exceed the setting value of thermal relay, causes protecting in time.Three voltage transformers of some employings, monitor respectively each phase voltage, and cost compare is high like this.
Also have at some in particular cases, because thunder and lightning, broken string etc. make circuit in phase shortage situation, if now start three phase electric machine, will cause the damage of motor.
Summary of the invention
The utility model provides a kind of phase-defect, for solving the problem of Three-phase electric motor phase protection.
The technical solution of the utility model is: a kind of phase-defect, comprises three-phase wire 1, main contactor contact KM2, voltage transformer TVa3, voltage transformer TVc4, auxiliary contactor coil KMa5, auxiliary contactor coil KMc6, auxiliary contactor coil KMb7, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10, main contactor coil KM11, wherein main contactor contact KM2 is connected in series in three-phase wire 1, voltage transformer TVa3 is connected with the A of three-phase wire 1, voltage transformer TVc4 is connected with the C of three-phase wire 1, auxiliary contactor coil KMa5 connects with voltage transformer TVa3, auxiliary contactor coil KMc6 connects with voltage transformer TVc4, auxiliary contactor coil KMa5 is connected with auxiliary contactor coil KMb7 respectively with auxiliary contactor coil KMc6, auxiliary contactor coil KMb7 is connected with voltage transformer TVc4 with voltage transformer TVa3 respectively, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10 connects with main contactor coil KM11, after series connection, auxiliary contactor contact KMa8 is connected with the A of three-phase wire 1, after series connection, main contactor coil KM11 is connected with the B of three-phase wire 1.
The voltage U of the A phase that described voltage transformer TVa3 records
athe voltage U of the C phase recording with voltage transformer TVc4
csum is the voltage U of B phase
b.
The course of work of the present utility model is:
The first step: in this device line attachment.
Second step: when circuit is normal, voltage transformer TVa3, TVc4 detect voltage, make auxiliary contactor coil KMa5, KMc6, KMb7 charged, auxiliary contactor contact KMa8, KMb9, KMc10 closure, main contactor coil KM11 obtains electric, then main contactor contact KM2 closure.
The 3rd step: motor can start.
The 4th step: when circuit phase shortage, no matter which does not have electricity mutually, and main contactor coil KM11 can not obtain electric, main contactor contact KM2 also can not be closed.
The 5th step: motor can not start.
The 6th step: the unexpected phase shortage of motor of moving, main contactor coil KM11 dead electricity so, then main contactor contact KM2 disconnects.
The 7th step: motor is out of service.
The beneficial effects of the utility model are:
1, can protect three phase electric machine to avoid the damage that occurs that phase shortage accident is brought;
2, by the stack to two phase voltages, draw the voltage of third phase, use less a kind of equipment;
3, reduce cost, simple in structure, easy to operate.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Each label in figure: 1 is that three-phase wire, 2 is that main contactor contact KM, 3 is that voltage transformer TVa, 4 is that voltage transformer TVc, 5 is that auxiliary contactor coil KMa, 6 is that auxiliary contactor coil KMc, 7 is that auxiliary contactor coil KMb, 8 is that auxiliary contactor contact KMa, 9 is that auxiliary contactor contact KMb, 10 is that auxiliary contactor contact KMc, 11 is main contactor coil KM.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of phase-defect, comprises three-phase wire 1, main contactor contact KM2, voltage transformer TVa3, voltage transformer TVc4, auxiliary contactor coil KMa5, auxiliary contactor coil KMc6, auxiliary contactor coil KMb7, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10, main contactor coil KM11, wherein main contactor contact KM2 is connected in series in three-phase wire 1, voltage transformer TVa3 is connected with the A of three-phase wire 1, voltage transformer TVc4 is connected with the C of three-phase wire 1, auxiliary contactor coil KMa5 connects with voltage transformer TVa3, auxiliary contactor coil KMc6 connects with voltage transformer TVc4, auxiliary contactor coil KMa5 is connected with auxiliary contactor coil KMb7 respectively with auxiliary contactor coil KMc6, auxiliary contactor coil KMb7 is connected with voltage transformer TVc4 with voltage transformer TVa3 respectively, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10 connects with main contactor coil KM11, after series connection, auxiliary contactor contact KMa8 is connected with the A of three-phase wire 1, after series connection, main contactor coil KM11 is connected with the B of three-phase wire 1.
The voltage U of the A phase that described voltage transformer TVa3 records
athe voltage U of the C phase recording with voltage transformer TVc4
csum is the voltage U of B phase
b.
Embodiment 2: as shown in Figure 1, a kind of phase-defect, comprises three-phase wire 1, main contactor contact KM2, voltage transformer TVa3, voltage transformer TVc4, auxiliary contactor coil KMa5, auxiliary contactor coil KMc6, auxiliary contactor coil KMb7, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10, main contactor coil KM11, wherein main contactor contact KM2 is connected in series in three-phase wire 1, voltage transformer TVa3 is connected with the A of three-phase wire 1, voltage transformer TVc4 is connected with the C of three-phase wire 1, auxiliary contactor coil KMa5 connects with voltage transformer TVa3, auxiliary contactor coil KMc6 connects with voltage transformer TVc4, auxiliary contactor coil KMa5 is connected with auxiliary contactor coil KMb7 respectively with auxiliary contactor coil KMc6, auxiliary contactor coil KMb7 is connected with voltage transformer TVc4 with voltage transformer TVa3 respectively, auxiliary contactor contact KMa8, auxiliary contactor contact KMb9, auxiliary contactor contact KMc10 connects with main contactor coil KM11, after series connection, auxiliary contactor contact KMa8 is connected with the A of three-phase wire 1, after series connection, main contactor coil KM11 is connected with the B of three-phase wire 1.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skill in the art, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022427.7U CN203747384U (en) | 2014-01-15 | 2014-01-15 | A three-phase motor phase loss protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022427.7U CN203747384U (en) | 2014-01-15 | 2014-01-15 | A three-phase motor phase loss protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747384U true CN203747384U (en) | 2014-07-30 |
Family
ID=51347143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420022427.7U Expired - Fee Related CN203747384U (en) | 2014-01-15 | 2014-01-15 | A three-phase motor phase loss protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747384U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106462135A (en) * | 2015-02-17 | 2017-02-22 | 株式会社Lg 化学 | Contactor control system |
-
2014
- 2014-01-15 CN CN201420022427.7U patent/CN203747384U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106462135A (en) * | 2015-02-17 | 2017-02-22 | 株式会社Lg 化学 | Contactor control system |
| CN106462135B (en) * | 2015-02-17 | 2019-02-26 | 株式会社Lg 化学 | Contactor Control System |
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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: 20140730 Termination date: 20150115 |
|
| EXPY | Termination of patent right or utility model |