CN203691293U - Mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter - Google Patents
Mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter Download PDFInfo
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- CN203691293U CN203691293U CN201320737757.XU CN201320737757U CN203691293U CN 203691293 U CN203691293 U CN 203691293U CN 201320737757 U CN201320737757 U CN 201320737757U CN 203691293 U CN203691293 U CN 203691293U
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Abstract
The utility model discloses a mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter comprising an isolating change-over switch connected with a three-phase inlet wire. The isolating change-over switch connected with the input ends of three groups of power thyristors connected in reverse parallel. The output ends of the power thyristors connected with three groups of loads. Bypass contactors are disposed on the two ends of each group of power thyristors. An isolating contactor is arranged between the output ends of the power thyristors and the three groups of loads. The bypass contactors and the isolating contactor are connected with a secondary loop circuit through a soft start controller. The mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter using the above technical scheme has follow characteristics. The isolating contactor is disconnected when a soft start switch is stopped to standby. Thus, induced voltage generated at the power thyristors and the load side is resolved, and unbeneficial cases on devices and workers caused by power thyristor damage in a conventional soft start switch are prevented effectively. Further, the safety factor of the soft start switch used in mining wells is increased.
Description
Technical field
The utility model relates to a kind of coal mine machinery equipment technical field, relates in particular to a kind of two contactor low-voltage alternating-current soft starters of mine flameproof and intrinsic safety type that are applied under coal mine.
Background technology
At present, be widely used in the mine flameproof and intrinsic safety type low-voltage alternating-current soft start under coal mine, its main power circuit structure is all to combine with the bypass contactor at isolation reversing switch, electric power thyristor and cross-over connection and electric power thyristor two ends.But, because electric power thyristor belongs to semiconductor element, in the time disconnecting bypass contactor (when Soft Start Switch stops standby), the mains side of electric power thyristor still has electricity, this has caused electric power thyristor under the effect of external electric field, still to exist a small amount of free electron to flow, thereby make electric power thyristor can not in completely turn-off state, cause global switch in the situation that mains side has electric standby, to still have electricity, load-side can sense equal or on the low side in the voltage of mains side too, although the energy of this induced voltage can not drive any load of load-side normally to work, but, but reduced the useful life of electric power thyristor, simultaneously, also there is potential safety hazard in the maintenance in soft start switch later stage.
Utility model content
The purpose of this utility model is just to provide a kind of mine flameproof and intrinsic safety type two contactor low-voltage alternating-current soft starters, short useful life to solve the existing electric power thyristor of prior art, and the security hidden trouble that soft start switch later period maintenance is brought.
For achieving the above object, the utility model is by the following technical solutions:
The utility model comprises the isolation reversing switch that three-phase inlet wire is connected, and isolation reversing switch is connected with the input of three groups of antiparallel electric power thyristors, and the output of electric power thyristor is connected with three groups of loads; Be provided with bypass contactor at electric power thyristor two ends, between the output of electric power thyristor and three groups of loads, be provided with isolation contactor, bypass contactor is connected with secondary circuit by soft start controller with isolation contactor.
Described isolation contactor is CKJ5-400/1140 vacuum contactor.
Described isolation contactor is T5N 630 circuit breakers.
Described bypass contactor is CKJ5-400/1140 vacuum contactor.
Described electric power thyristor is KT9-1200/1500 controllable silicon.
Described soft start controller is MX soft initiator.
Compared with prior art, adopt the following characteristics that the utlity model has of such scheme: in the time that soft start switch stops standby, isolate contactor and disconnect, this has not only solved electric power thyristor and load-side and has existed the problem of induced voltage, and effectively avoid in original soft switch because electric power thyristor damages the generation causing equipment, the unfavorable situation of personnel, meanwhile, also improved the coefficient of safety during low pressure Soft Start Switch is used under coal mine.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the present utility model.
Embodiment
Shown in accompanying drawing, the utility model comprises three-phase inlet wire R, S, and the isolation reversing switch GHK that T is connected, is connected with the input of three groups of antiparallel electric power thyristor SCR from reversing switch GHK, the output of electric power thyristor SCR and three groups of load D1, D2, D3 is connected; Be provided with bypass contactor KM2-abc at electric power thyristor SCR two ends, the output of electric power thyristor SCR and three groups of load D1, D2, is provided with isolation contactor KM1-abc between D3, bypass contactor KM2-abc is connected with secondary circuit by soft start controller ZB with isolation contactor KM1-abc; Isolation contactor is T5N 630 circuit breakers, and electric power thyristor SCR is KT9-1200/1500 controllable silicon, and soft start controller ZB is MX soft initiator.
As improvement of the present utility model: isolation contactor KM1-abc and bypass contactor KM2-abc all can be CKJ5-400/1140 vacuum contactor, compared with other vacuum contactor, CKJ5-400/1140 vacuum contactor has the advantages such as volume is little, lightweight, the life-span is long; Isolation contactor KM1-abc also can be T5N 630 circuit breakers.
Operation principle of the present utility model: when soft straight toggle switch YK1 pushes soft state, when far and near control toggle switch YK2 pushes nearly control state, in trouble-free situation, the fault point K3 closure of soft start controller ZB (as breaks down, fault point disconnects, whole closing circuit disconnects, and whole switch is out of service).Press switch knob QA, relay coil I JZC1 obtains electric adhesive, unclamps after switch knob QA, and by relay coil I normally opened contact I, JZC1-2 carrys out self-insurance, makes the long-term adhesive of relay coil I JZC1.Relay coil I JZC1 adhesive, input I1 signal by relay coil I normally opened contact II JZC1-4 to controller Logo, controller Logo makes output point I Q1 conducting according to program setting itself after by the signal receiving, relay coil II JZC2 adhesive after output point I QI conducting, thereby drive relay coil II normally opened contact I JZC2-1 and drive relay coil II normally opened contact II JZC2-2 to become normally-closed contact, make vacuum contactor line bag KM1 adhesive energising, after vacuum contactor line bag KM1 adhesive, pass through the input I2 signal of vacuum contactor line bag normally opened contact KM1-1 to controller Logo, controller Logo makes output point II Q2 conducting according to the program setting of itself after receiving signal, soft start controller ZB receives soft signal.After receiving soft signal, electric power thyristor SCR makes to change from small to big by the electric current of itself according to the angle of flow of change itself, makes motor start soft start.Soft the time of setting according to soft start controller ZB, from receiving soft after signal beginning and end time finishes, as fault-free soft start controller ZB give an order to bypass contact K1 closure and (in soft process, break down, the fault point K3 of soft start controller disconnects, soft failure), relay coil III JZC3 adhesive, become normally closed thereby drive relay coil III normally opened contact I JZC3-1 and drive relay coil III normally opened contact II JZC3-2 often to open, make bypass contactor line bag KM2 adhesive energising.After bypass contactor line bag KM2 adhesive, send combined floodgate feedback command (as soft start controller does not receive feedback signal, be also judged to be soft fault, fault point K3 disconnects) by bypass contactor line bag normally opened contact KM2-1 to soft start controller ZB.Receive after feedback command, electric power thyristor is out of service, and soft completes.Motor moves by bypass contactor KM2-abc major loop and the adhesive of isolation contactor KM1-abc major loop.
Claims (6)
1. the two contactor low-voltage alternating-current soft starters of mine flameproof and intrinsic safety type, it is characterized in that: it comprises three-phase inlet wire (R, S, T) connected isolation reversing switch (GHK), isolation reversing switch (GHK) is connected with the input of three groups of antiparallel electric power thyristors (SCR), the output of electric power thyristor (SCR) and three groups of loads (D1, D2, D3) are connected; Be provided with bypass contactor (KM2-abc) at electric power thyristor (SCR) two ends, the output of electric power thyristor (SCR) and three groups of load (D1, D2, D3) between, be provided with isolation contactor (KM1-abc), bypass contactor (KM2-abc) is connected with secondary circuit by soft start controller (ZB) with isolation contactor (KM1-abc).
2. the two contactor low-voltage alternating-current soft starters of mine flameproof and intrinsic safety type according to claim 1, is characterized in that: described isolation contactor (KM1-abc) is CKJ5-400/1140 vacuum contactor.
3. the two contactor low-voltage alternating-current soft starters of mine flameproof and intrinsic safety type according to claim 1, is characterized in that: described isolation contactor (KM1-abc) is T5N 630 circuit breakers.
4. the two contactor low-voltage alternating-current soft starters of mine flameproof and intrinsic safety type according to claim 1, is characterized in that: described bypass contactor (KM2-abc) is CKJ5-400/1140 vacuum contactor.
5. according to the two contactor low-voltage alternating-current soft starters of the arbitrary described mine flameproof and intrinsic safety type of claim 1～4, it is characterized in that: described electric power thyristor (SCR) is KT9-1200/1500 controllable silicon.
6. according to the two contactor low-voltage alternating-current soft starters of the arbitrary described mine flameproof and intrinsic safety type of claim 1～4, it is characterized in that: described soft start controller (ZB) is MX soft initiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320737757.XU CN203691293U (en) | 2013-11-21 | 2013-11-21 | Mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320737757.XU CN203691293U (en) | 2013-11-21 | 2013-11-21 | Mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691293U true CN203691293U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320737757.XU Expired - Fee Related CN203691293U (en) | 2013-11-21 | 2013-11-21 | Mining explosion-proof and intrinsically-safe dual-contactor low-voltage AC soft starter |
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| CN (1) | CN203691293U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660107A (en) * | 2013-11-21 | 2015-05-27 | 河南省济源市矿用电器有限责任公司 | Mining flame-proof and intrinsically safe double-contactor low-voltage alternating-current soft starter |
| CN107359828A (en) * | 2017-07-28 | 2017-11-17 | 沈阳华创风能有限公司 | A kind of yaw drive system protection device and method |
-
2013
- 2013-11-21 CN CN201320737757.XU patent/CN203691293U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660107A (en) * | 2013-11-21 | 2015-05-27 | 河南省济源市矿用电器有限责任公司 | Mining flame-proof and intrinsically safe double-contactor low-voltage alternating-current soft starter |
| CN107359828A (en) * | 2017-07-28 | 2017-11-17 | 沈阳华创风能有限公司 | A kind of yaw drive system protection device and method |
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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: 20140702 Termination date: 20141121 |
|
| EXPY | Termination of patent right or utility model |