CN203983961U - A kind of three-phase electric protector - Google Patents
A kind of three-phase electric protector Download PDFInfo
- Publication number
- CN203983961U CN203983961U CN201420462699.9U CN201420462699U CN203983961U CN 203983961 U CN203983961 U CN 203983961U CN 201420462699 U CN201420462699 U CN 201420462699U CN 203983961 U CN203983961 U CN 203983961U
- Authority
- CN
- China
- Prior art keywords
- phase
- leakage switch
- thermal relay
- current
- normally opened
- Prior art date
- 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 - Lifetime
Links
- 230000001012 protector Effects 0.000 title claims abstract description 8
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses a kind of three-phase electric protector, this device comprises three-phase leakage switch (RD), a fuse (Fu), a current-limiting resistance (R), a thermal relay (RJ).The normally opened contact K of wherein a phase line, fuse, current-limiting resistance, the thermal relay of three-phase leakage switch upper end is connected successively; normally opened contact K is finally connected with another phase line of three-phase leakage switch lower end; by the cooperation of thermal relay and three-phase leakage switch; can realize electric leakage, short circuit simultaneously, fall mutually and the defencive function of overload, have advantages of that cost is low, simple in structure, installation and repairing convenient, electrical equipment and circuit take up space very little.
Description
Technical field
The utility model relates to motor protection equipment research field, particularly a kind of three-phase electric protector.
Background technology
Threephase motor need to leak electricity in the time of normal use, short circuit, transship, fall protection mutually, at present, need to adopt respectively corresponding protective device to above-mentioned each situation protection, makes circuit structure very complicated.In addition, owing to will adopting respectively leakage switch, A.C. contactor, thermal relay etc. to be used in conjunction with, so in the time that multiple motors is central controlled, can cause the problems such as cost is high, electronic box space requirement is large, circuit is complicated, the circuit of secondary circuit is more, maintenance is inconvenient.
Utility model content
Main purpose of the present utility model is that the shortcoming that overcomes prior art, with not enough, provides a kind of three-phase electric protector, and this apparatus structure is simple, and cost is low, can realize electric leakage, short circuit simultaneously, transship, falls the function of protection mutually.
The purpose of this utility model realizes by following technical scheme: a kind of three-phase electric protector, comprises a three-phase leakage switch, a fuse, a current-limiting resistance and a thermal relay.Leakage switch, thermal relay are connected successively with motor; A wherein phase line of three-phase leakage switch upper end, fuse, current-limiting resistance, thermal relay normally opened contact K are connected successively, and normally opened contact K is finally connected with another phase line of three-phase leakage switch lower end.By the cooperation of thermal relay and three-phase leakage switch, can realize electric leakage, short circuit simultaneously, fall mutually and overload protection function.
Operation principle of the present utility model is: when electromotor overload or fall phase time, the rated current of the current ratio motor in circuit will obviously increase, bimetal leaf bending in thermal relay, make its normally opened contact closure, thereby the electric current in circuit from a wherein phase line of three-phase leakage switch upper end through fuse, current-limiting resistance, the normally opened contact of thermal relay is to another phase line of three-phase leakage switch lower end, in the circuit of three-phase leakage switch, just produce a unsymmetrical current (or residual action current), make three-phase electric leakage switch tripping, thereby cut off the electricity supply, protection motor safety.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
The utility model combines three-phase leakage switch and thermal relay; can realize electric leakage, short circuit simultaneously, transship, fall the function of protection mutually; have advantages of that cost is low, simple in structure, that installation and repairing is convenient, electrical equipment and circuit take up space is very little, protection is moved simultaneously sensitivity and reliability are also fine.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment 1
As shown in Figure 1; three-phase electric protector described in the present embodiment; comprise three-phase leakage switch RD, fuse Fu, a current-limiting resistance R, thermal relay RJ, while normally work, power supply accesses the power input of threephase motor after three-phase leakage switch RD, thermal relay RJ.
Normally opened contact K in three-phase leakage switch on the end of incoming cables of B phase line, fuse Fu, current-limiting resistance R, thermal relay RJ is connected successively.The normally opened contact K other end is connected with the leading-out terminal of C phase line in three-phase leakage switch.
When electromotor overload or fall phase time; the rated current of the current ratio motor in circuit will obviously increase; the bimetal leaf bending of thermal relay; make its normally opened contact K closure, now, electric current is from B phase → Fu → R → K → C phase; in the circuit of three-phase leakage switch RD, produce a unsymmetrical current (or residual action current); make three-phase electric leakage switch tripping, thereby cut off power supply, protected motor safety.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (1)
1. a three-phase electric protector, is characterized in that, comprises a three-phase leakage switch, a fuse, a current-limiting resistance and a thermal relay, and leakage switch, thermal relay are connected successively with motor; A wherein phase line of three-phase leakage switch upper end, fuse, current-limiting resistance, thermal relay normally opened contact K are connected successively, and normally opened contact K is finally connected with another phase line of three-phase leakage switch lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420462699.9U CN203983961U (en) | 2014-08-15 | 2014-08-15 | A kind of three-phase electric protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420462699.9U CN203983961U (en) | 2014-08-15 | 2014-08-15 | A kind of three-phase electric protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203983961U true CN203983961U (en) | 2014-12-03 |
Family
ID=51981377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420462699.9U Expired - Lifetime CN203983961U (en) | 2014-08-15 | 2014-08-15 | A kind of three-phase electric protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203983961U (en) |
-
2014
- 2014-08-15 CN CN201420462699.9U patent/CN203983961U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141203 |
|
| CX01 | Expiry of patent term |