CN203983963U - Motor security of operation protective circuit - Google Patents
Motor security of operation protective circuit Download PDFInfo
- Publication number
- CN203983963U CN203983963U CN201420385810.9U CN201420385810U CN203983963U CN 203983963 U CN203983963 U CN 203983963U CN 201420385810 U CN201420385810 U CN 201420385810U CN 203983963 U CN203983963 U CN 203983963U
- Authority
- CN
- China
- Prior art keywords
- soft initiator
- splicing ear
- motor
- current transformer
- input
- 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 - Fee Related
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model discloses a kind of motor security of operation protective circuit, comprise and be connected to three-phase power line L
1, L
2and L
3on circuit breaker Q F, the three-phase power line of described circuit breaker Q F output is connected with soft initiator RQ, the three-phase power line of described soft initiator RQ output is connected with motor M, on the three-phase power line at described soft initiator RQ two ends, is provided with successively current transformer LH
a, LH
band LH
c, on the three-phase power line at described soft initiator RQ two ends, be connected with the normally opened contact of A.C. contactor KM in turn; Described soft initiator is connected with soft initiator control circuit and motor current detecting circuit; Can control soft initiator by motor current detecting circuit and stop, and then it is out of service in the time that electric current is excessive, to control motor, ensure the safety of motor and equipment, simple in structure, protect effective.
Description
Technical field
The utility model relates to a kind of protective circuit, relates in particular to a kind of motor security of operation and current of electric and detects safe protective circuit.
Background technology
In service at various device; one of must indispensable electrical device as the motor of power set; motor is in operation special protection system for motor need to be set; to ensure the safe operation of motor; in motor operation course; major part need to be carried out Real-Time Monitoring to the system of motor; as electric current of motor etc.; because the general power of the motor using in various kinds of equipment is all larger; the electric current of large motor is even larger in tens peaces; therefore in measurement and running, can there is larger potential safety hazard, use very dangerous.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of stable, and current of electric detects safe motor security of operation protective circuit.
For solving the problems of the technologies described above, the technical solution of the utility model is: motor security of operation protective circuit, comprises and be connected to three-phase power line L
1, L
2and L
3on circuit breaker Q F, the three-phase power line of described circuit breaker Q F output is connected with soft initiator RQ, the three-phase power line of described soft initiator RQ output is connected with motor M, on the three-phase power line at described soft initiator RQ two ends, is provided with successively current transformer LH
a, LH
band LH
c, on the three-phase power line at described soft initiator RQ two ends, be connected with the normally opened contact of A.C. contactor KM in turn;
Described soft initiator is connected with soft initiator control circuit and motor current detecting circuit;
Described soft initiator control circuit comprises the start button HA on the first input splicing ear that is connected to described soft initiator RQ, be connected to the second stop button TA inputting on splicing ear of described soft initiator RQ, the other end of described start button HA and described stop button TA is connected to respectively on the 3rd input splicing ear of described soft initiator RQ, between the 3rd input splicing ear of the second input splicing ear of described soft initiator RQ and described soft initiator RQ, be also connected with the normally opened contact of secondary side thermal relay KH, the 4th input splicing ear of described soft initiator RQ is connected to input power L by described A.C. contactor KM, the output splicing ear of described soft initiator RQ is connected to center line N, between described input power L and described center line N, be also connected with operation instruction branch road and stop indicating branch road,
Described motor current detecting circuit comprises detection ammeter A in parallel
1, A
2and A
3, described detection ammeter A
1, A
2and A
3input be connected with respectively secondary side thermal relay KH, described detection ammeter A
1output be connected to described current transformer LH
aa splicing ear, described current transformer LH
aanother splicing ear ground connection, described detection ammeter A
2output be connected to described current transformer LH
ba splicing ear, described current transformer LH
banother splicing ear ground connection, described detection ammeter A
3output be connected to described current transformer LH
ca splicing ear, described current transformer LH
canother splicing ear ground connection.
As preferred technical scheme, described operation instruction branch road comprises the run indicator HD being connected between described input power L and described center line N, and described run indicator HD is serially connected with the normally opened contact of described A.C. contactor KM.
As the improvement to technique scheme, described in stop indicating branch road to comprise and be connected to the run indicator LD between described input power L and described center line N, described run indicator LD is serially connected with the normally-closed contact of described A.C. contactor KM.
As the improvement to technique scheme, described current transformer LH
a, LH
band LH
cno-load voltage ratio be respectively 100/5 the stream ratio of falling.
Owing to having adopted technique scheme; the beneficial effects of the utility model are: be provided with after current transformer; when the electric current of flow measurement motor operation, monitor in low current condition; therefore current detecting safety; be provided with the electric power protection device such as A.C. contactor and secondary side thermal relay; in the time of motor overload, electric current is excessive; secondary side thermal relay will move; by its normal closure of making war; input signal is to the terminal that stops of soft initiator; out of service the playing of motor protected motor and supply line's effect immediately, and simple in structure, protection coefficient of safety is high.
Brief description of the drawings
The following drawings is only intended to the utility model to schematically illustrate and explain, does not limit scope of the present utility model.Wherein:
Fig. 1 is the circuit catenation principle figure of the utility model embodiment motor M;
Fig. 2 is the circuit theory diagrams of the utility model embodiment soft initiator control circuit;
Fig. 3 is the circuit theory diagrams of the utility model embodiment motor current detecting circuit.
Embodiment
Below in conjunction with drawings and Examples, further set forth the utility model.In the following detailed description, only by the mode of explanation, some example embodiment of the present utility model has been described.Undoubtedly, those of ordinary skill in the art can recognize, in the situation that not departing from spirit and scope of the present utility model, can revise described embodiment by various mode.Therefore, accompanying drawing is illustrative with being described in essence, instead of for limiting the protection range of claim.
As shown in Figure 1, motor security of operation protective circuit, comprises and is connected to three-phase power line L
1, L
2and L
3on circuit breaker Q F, the three-phase power line of described circuit breaker Q F output is connected with soft initiator RQ, the three-phase power line of described soft initiator RQ output is connected with motor M, on the three-phase power line at described soft initiator RQ two ends, is provided with successively current transformer LH
a, LH
band LH
c, on the three-phase power line at described soft initiator RQ two ends, be connected with the normally opened contact of A.C. contactor KM in turn.
Soft initiator described in the present embodiment is connected with soft initiator control circuit and motor current detecting circuit.As shown in Figure 2, described soft initiator control circuit comprises the start button HA on the first input splicing ear that is connected to described soft initiator RQ, be connected to the second stop button TA inputting on splicing ear of described soft initiator RQ, the other end of described start button HA and described stop button TA is connected to respectively on the 3rd input splicing ear of described soft initiator RQ, between the 3rd input splicing ear of the second input splicing ear of described soft initiator RQ and described soft initiator RQ, be also connected with the normally opened contact of secondary side thermal relay KH, the 4th input splicing ear of described soft initiator RQ is connected to input power L by described A.C. contactor KM, the output splicing ear of described soft initiator RQ is connected to center line N, between described input power L and described center line N, be also connected with operation instruction branch road and stop indicating branch road, described operation instruction branch road comprises the run indicator HD being connected between described input power L and described center line N, and described run indicator HD is serially connected with the normally opened contact of described A.C. contactor KM.Describedly stop indicating branch road to comprise and be connected to the run indicator LD between described input power L and described center line N, described run indicator LD is serially connected with the normally-closed contact of described A.C. contactor KM.
As shown in Figure 3, described motor current detecting circuit comprises detection ammeter A in parallel
1, A
2and A
3, described detection ammeter A
1, A
2and A
3input be connected with respectively secondary side thermal relay KH, described detection ammeter A
1output be connected to described current transformer LH
aa splicing ear, described current transformer LH
aanother splicing ear ground connection, described detection ammeter A
2output be connected to described current transformer LH
ba splicing ear, described current transformer LH
banother splicing ear ground connection, described detection ammeter A
3output be connected to described current transformer LH
ca splicing ear, described current transformer LH
canother splicing ear ground connection.Described current transformer LH
a, LH
band LH
cno-load voltage ratio be respectively 100/5 the stream ratio of falling.
Three current transformer LH in the present embodiment
a, LH
band LH
cconvert in proportion the high electric current of motor to low current, and by three detection ammeter A
1, A
2and A
3detect in real time; in the time of the faults such as circuit is short-circuited, overload; the secondary side thermal relay KH being connected with each detection ammeter can provide signal to A.C. contactor KM, simultaneously by soft initiator RQ disengagement failure circuit, to protect the safety of electric power system and motor.
Taking the control of 30KW soft start as example; three current transformer LHa, LHb and LHc are respectively through three-phase line; according to 100/5 stream falls than 30KW motor operating current is become and delivers to secondary line; the secondary side thermal relay KH of secondary line adopts 2-5A range; 30KW motor rated current is 60A; according to 100/5 ratiometric conversion, be 3A so secondary side thermal relay protective current is set.In the time of motor overload, electric current is excessive, corresponding secondary side thermal relay KH action, and normal battle of the closed input signal of secondary side thermal relay KH stops terminal to soft initiator, and out of service the playing of motor protects motor and supply line to act on immediately.By arranging, reduce double measurement circuital current grade, heighten coefficient of safety.By arranging, 35 DEG C of room temperatures, overload is 125% time, action in 20 minutes; When overload 600%-1000%, instantaneous operation.
The utility model is provided with after current transformer; when the electric current of flow measurement motor operation, monitor in low current condition; therefore current detecting safety, is provided with the electric power protection device such as A.C. contactor and secondary side thermal relay, and in the time of motor overload, electric current is excessive; secondary side thermal relay will move; by its normal closure of making war, input signal is to the terminal that stops of soft initiator, and out of service the playing of motor protects motor and supply line to act on immediately; simple in structure, protection coefficient of safety is high.
More than show and described general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. motor security of operation protective circuit, is characterized in that: comprise and be connected to three-phase power line L
1, L
2and L
3on circuit breaker Q F, the three-phase power line of described circuit breaker Q F output is connected with soft initiator RQ, the three-phase power line of described soft initiator RQ output is connected with motor M, on the three-phase power line at described soft initiator RQ two ends, is provided with successively current transformer LH
a, LH
band LH
c, on the three-phase power line at described soft initiator RQ two ends, be connected with the normally opened contact of A.C. contactor KM in turn;
Described soft initiator is connected with soft initiator control circuit and motor current detecting circuit;
Described soft initiator control circuit comprises the start button HA on the first input splicing ear that is connected to described soft initiator RQ, be connected to the second stop button TA inputting on splicing ear of described soft initiator RQ, the other end of described start button HA and described stop button TA is connected to respectively on the 3rd input splicing ear of described soft initiator RQ, between the 3rd input splicing ear of the second input splicing ear of described soft initiator RQ and described soft initiator RQ, be also connected with the normally opened contact of secondary side thermal relay KH, the 4th input splicing ear of described soft initiator RQ is connected to input power L by described A.C. contactor KM, the output splicing ear of described soft initiator RQ is connected to center line N, between described input power L and described center line N, be also connected with operation instruction branch road and stop indicating branch road,
Described motor current detecting circuit comprises detection ammeter A in parallel
1, A
2and A
3, described detection ammeter A
1, A
2and A
3input be connected with respectively secondary side thermal relay KH, described detection ammeter A
1output be connected to described current transformer LH
aa splicing ear, described current transformer LH
aanother splicing ear ground connection, described detection ammeter A
2output be connected to described current transformer LH
ba splicing ear, described current transformer LH
banother splicing ear ground connection, described detection ammeter A
3output be connected to described current transformer LH
ca splicing ear, described current transformer LH
canother splicing ear ground connection.
2. motor security of operation protective circuit as claimed in claim 1; it is characterized in that: described operation instruction branch road comprises the run indicator HD being connected between described input power L and described center line N, and described run indicator HD is serially connected with the normally opened contact of described A.C. contactor KM.
3. motor security of operation protective circuit as claimed in claim 1 or 2; it is characterized in that: described in stop indicating branch road to comprise and be connected to the run indicator LD between described input power L and described center line N, described run indicator LD is serially connected with the normally-closed contact of described A.C. contactor KM.
4. motor security of operation protective circuit as claimed in claim 3, is characterized in that: described current transformer LH
a, LH
band LH
cno-load voltage ratio be respectively 100/5 the stream ratio of falling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420385810.9U CN203983963U (en) | 2014-07-14 | 2014-07-14 | Motor security of operation protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420385810.9U CN203983963U (en) | 2014-07-14 | 2014-07-14 | Motor security of operation protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203983963U true CN203983963U (en) | 2014-12-03 |
Family
ID=51981379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420385810.9U Expired - Fee Related CN203983963U (en) | 2014-07-14 | 2014-07-14 | Motor security of operation protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203983963U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782102A (en) * | 2016-05-09 | 2016-07-20 | 李堂兴 | Control method for soft starting of fan |
-
2014
- 2014-07-14 CN CN201420385810.9U patent/CN203983963U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782102A (en) * | 2016-05-09 | 2016-07-20 | 李堂兴 | Control method for soft starting of fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Haihui Group Co., Ltd. Assignor: Yu Botao Contract record no.: 2015370000198 Denomination of utility model: Motor running safety protection circuit Granted publication date: 20141203 License type: Exclusive License Record date: 20151203 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| 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: 20141203 Termination date: 20160714 |