CN203747384U - Phase failure protection device for three-phase motor - Google Patents
Phase failure protection device for three-phase motor Download PDFInfo
- Publication number
- 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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- China
- Prior art keywords
- phase
- auxiliary
- voltage transformer
- auxiliary contactor
- contact
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000005611 electricity Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Abstract
The utility model relates to a phase failure protection device for a three-phase motor, and belongs to the technical field of three-phase motor protection. The phase failure protection device comprises a three-phase electric wire, a main contactor contact KM, a voltage transformer TVa, a voltage transformer TVc, an auxiliary contact coil KMa, an auxiliary contactor coil KMc, an auxiliary contactor coil KMb, an auxiliary contactor contact KMa, an auxiliary contactor contact KMb, an auxiliary contactor contact KMc and a main contactor coil KM, wherein the main contactor contact KM is connected to the three-phase electric wire in series, the voltage transformer TVa is connected with a phase A, the voltage transformer TVc is connected with a phase C, the auxiliary contact coil KMa is connected with the voltage transformer TVa in series, the auxiliary contact coil KMc is connected with the voltage transformer TVc in series, and the auxiliary contact coil KMa and the auxiliary contactor coil KMc are connected with the auxiliary contactor coil KMb. The phase failure protection device provided by the utility model can protect the three-phase motor from damages brought about by a phase failure accident, and is simple in structure and convenient to operate.
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)
1. a phase-defect, is characterized in that: comprise three-phase wire (1), main contactor contact KM(2), voltage transformer TVa(3), voltage transformer TVc(4), auxiliary contactor coil KMa(5), auxiliary contactor coil KMc(6), auxiliary contactor coil KMb(7), auxiliary contactor contact KMa(8), auxiliary contactor contact KMb(9), auxiliary contactor contact KMc(10), main contactor coil KM(11), wherein main contactor contact KM(2) be connected in series in three-phase wire (1), voltage transformer TVa(3) be connected with the A of three-phase wire (1), voltage transformer TVc(4) be connected with the C of three-phase wire (1), auxiliary contactor coil KMa(5) with voltage transformer TVa(3) connect, auxiliary contactor coil KMc(6) with voltage transformer TVc(4) connect, auxiliary contactor coil KMa(5) with auxiliary contactor coil KMc(6) respectively with auxiliary contactor coil KMb(7) be connected, auxiliary contactor coil KMb(7) respectively with voltage transformer TVa(3) with voltage transformer TVc(4) be connected, auxiliary contactor contact KMa(8), auxiliary contactor contact KMb(9), auxiliary contactor contact KMc(10) with main contactor coil KM(11) connect, auxiliary contactor contact KMa(8 after series connection) be connected with the A of three-phase wire (1), main contactor coil KM(11 after series connection) be connected with the B of three-phase wire (1).
2. phase-defect according to claim 1, is characterized in that: described voltage transformer TVa(3) voltage U of the A phase that records
awith voltage transformer TVc(4) voltage U of the C phase that records
csum is the voltage U of B phase
b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022427.7U CN203747384U (en) | 2014-01-15 | 2014-01-15 | Phase failure protection device for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022427.7U CN203747384U (en) | 2014-01-15 | 2014-01-15 | Phase failure protection device for three-phase motor |
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 | Phase failure protection device for three-phase motor |
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 |