CN205195253U - Short -circuit protection device - Google Patents
Short -circuit protection device Download PDFInfo
- Publication number
- CN205195253U CN205195253U CN201520918731.4U CN201520918731U CN205195253U CN 205195253 U CN205195253 U CN 205195253U CN 201520918731 U CN201520918731 U CN 201520918731U CN 205195253 U CN205195253 U CN 205195253U
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- China
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- circuit
- transformer
- connects
- resistance
- voltage comparator
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- Expired - Fee Related
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Abstract
The utility model provides a short -circuit protection device, which comprises a power circuit, control circuit and protection circuit, power supply circuit's output connection control circuit, the control circuit control connection protection circuit, power supply circuit includes consecutive switch, first transformer, bridge rectifier filter circuit and stabiliser, the output connection control circuit of stabiliser, the protection circuit includes the second transformer, connect through the normally closed contact of relay in the second transformer's former limit, the second transformer's vice limit is through fourth resistance connected load, the second transformer's vice limit is still through third ohmic connection voltage comparater's non inverting input end. The utility model discloses can be when the short circuit phenomenon takes place for the circuit load of rapid cutting -off of short -circuit point place circuit, the action is sensitive, safe and reliable.
Description
Technical field
The utility model relates to relay protection field, particularly relates to a kind of short-circuit protection.
Background technology
Transmission line in the course of the work, inevitably there will be line short phenomenon, energy fast shut-off load during for guaranteeing that circuit is short-circuited, reduce loss, the load side of existing transmission line is generally provided with autoreclose breaker, autoreclose breaker can cut off load rapidly when circuit is short-circuited phenomenon, and can again close after tripping, if what circuit occurred is temporary short circuit, after then automatic reclosing relay closes again, circuit works again, if permanent fault, then autoreclose breaker disconnects again, by load break.Autoreclose breaker is after repeatedly tripping and closing a floodgate, inevitably there will be the phenomenon that autoreclose breaker sensitivity declines, if can not overhaul autoreclose breaker in time, then there will be autoreclose breaker malfunctioning, can not the phenomenon of cutting-off of short-circuit point in time, cause large-area power-cuts, affect industrial production and daily life.
Utility model content
The purpose of this utility model is to provide a kind of short-circuit protection, can the load of rapid cutting-off of short-circuit point place circuit when circuit is short-circuited phenomenon, is active in one's movements, safe and reliable.
For achieving the above object, the utility model adopts following technical scheme:
A kind of short-circuit protection, comprise power circuit, control circuit and protective circuit, the output connection control circuit of described power circuit, control circuit control connection protective circuit, described power circuit comprises the mains switch be connected successively, first transformer, bridge rectifier filter circuit and pressurizer, the output of described pressurizer connects one end of the first electric capacity, the other end ground connection of the first electric capacity, the two ends of the first electric capacity are parallel with the series circuit of the first resistance and the second resistance composition, described control circuit is made up of voltage comparator, the reverse input end of voltage comparator connects between the first resistance and the second resistance, the in-phase input end of voltage comparator is through the second capacity earth, the in-phase input end of voltage comparator also connects protective circuit through the 3rd resistance, the power end of described voltage comparator connects the output of pressurizer, the output of voltage comparator connects the positive pole of the first diode, the negative pole of the first diode is through the 3rd capacity earth, the negative pole of the first diode is also through the base stage of the 5th resistance connecting triode, the base stage of triode is also through the 4th capacity earth, the grounded emitter of described triode, the collector electrode of triode connects the output of pressurizer through the coil of relay, the two ends of relay coil are parallel with the second diode, described protective circuit comprises the second transformer, the former limit of the second transformer connects power supply through the normally-closed contact of relay, the secondary of the second transformer connects load through the 4th resistance, and the secondary of the second transformer also connects the in-phase input end of voltage comparator through the 3rd resistance.
Described pressurizer adopts 78 serial pressurizers, exports positive voltage.
The utility model circuit replaces existing autoreclose breaker and isolating switch, main circuit will adopt voltage comparator and relay, voltage comparator is sensitiveer to voltage signal, can judge rapidly whether circuit is short-circuited fault, relay is swift in response simultaneously, can when being short-circuited fault rapid disengagement failure point, try to avert accidents; Circuit structure is simple simultaneously, only just can be realized by diode, electric capacity and resistance, cheap, is easy to realize.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, a kind of short-circuit protection described in the utility model, comprise power circuit, control circuit and protective circuit, the output connection control circuit of power circuit, control circuit control connection protective circuit, power circuit comprises the mains switch SB1 be connected successively, first transformer T1, bridge rectifier filter circuit and pressurizer 1, pressurizer 1 adopts 78 serial pressurizers, export positive voltage, the output of pressurizer 1 connects one end of the first electric capacity C1, the other end ground connection of the first electric capacity C1, the two ends of the first electric capacity C1 are parallel with the series circuit of the first resistance R1 and the second resistance R2 composition, control circuit is made up of voltage comparator ic, 2 pins (reverse input end) of voltage comparator ic connect between the first resistance R1 and the second resistance R2, 3 pins (in-phase input end) of voltage comparator ic are through the second electric capacity C2 ground connection, 3 pins (in-phase input end) of voltage comparator ic also connect protective circuit through the 3rd resistance R3, 4 pins (power end) of voltage comparator ic connect the output of pressurizer 1, 6 pins (output) of voltage comparator ic connect the positive pole of the first diode D1, the negative pole of the first diode D1 is through the 3rd electric capacity C3 ground connection, the negative pole of the first diode D1 is also through the base stage of the 5th resistance R5 connecting triode T1, the base stage of triode T1 is also through the 4th electric capacity C4 ground connection, the grounded emitter of triode T1, the collector electrode of triode T1 connects the output of pressurizer 1 through the coil K1 of relay, the two ends of relay coil K1 are parallel with the second diode D2, protective circuit comprises the second transformer T2, the former limit of the second transformer T2 connects power supply through the normally-closed contact K1-1 of relay, the secondary of the second transformer T2 connects load RL through the 4th resistance R4, and the secondary of the second transformer T2 also connects 3 pins (in-phase input end) of voltage comparator ic through the 3rd resistance R3.
The utility model operationally, press mains switch SB1, now 3 pins (in-phase input end) current potential of voltage comparator ic is lower than 2 pins (reverse input end) current potential, 6 pins (output) output low level of voltage comparator ic, relay coil K1 must not be electric, its normally-closed contact K1-1 closes, and load RL obtains electric, starts working.When there is short trouble in load-side, the current potential of 3 pins (in-phase input end) of voltage comparator ic is higher than the current potential of 2 pins (reverse input end), 6 pins (output) of voltage comparator ic export high level, triode T1 conducting, the coil K1 of relay obtains electric, its normally-closed contact K1-1 disconnects, and is cut off by the load of short circuit, tries to avert accidents.Voltage comparator is sensitiveer to voltage signal, and can judge rapidly whether circuit is short-circuited fault, relay is swift in response simultaneously, can when being short-circuited fault rapid disengagement failure point, try to avert accidents.
Claims (2)
1. a short-circuit protection, it is characterized in that: comprise power circuit, control circuit and protective circuit, the output connection control circuit of described power circuit, control circuit control connection protective circuit, described power circuit comprises the mains switch be connected successively, first transformer, bridge rectifier filter circuit and pressurizer, the output of described pressurizer connects one end of the first electric capacity, the other end ground connection of the first electric capacity, the two ends of the first electric capacity are parallel with the series circuit of the first resistance and the second resistance composition, described control circuit is made up of voltage comparator, the reverse input end of voltage comparator connects between the first resistance and the second resistance, the in-phase input end of voltage comparator is through the second capacity earth, the in-phase input end of voltage comparator also connects protective circuit through the 3rd resistance, the power end of described voltage comparator connects the output of pressurizer, the output of voltage comparator connects the positive pole of the first diode, the negative pole of the first diode is through the 3rd capacity earth, the negative pole of the first diode is also through the base stage of the 5th resistance connecting triode, the base stage of triode is also through the 4th capacity earth, the grounded emitter of described triode, the collector electrode of triode connects the output of pressurizer through the coil of relay, the two ends of relay coil are parallel with the second diode, described protective circuit comprises the second transformer, the former limit of the second transformer connects power supply through the normally-closed contact of relay, the secondary of the second transformer connects load through the 4th resistance, and the secondary of the second transformer also connects the in-phase input end of voltage comparator through the 3rd resistance.
2. a kind of short-circuit protection as claimed in claim 1, is characterized in that: described pressurizer adopts 78 serial pressurizers, exports positive voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520918731.4U CN205195253U (en) | 2015-11-18 | 2015-11-18 | Short -circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520918731.4U CN205195253U (en) | 2015-11-18 | 2015-11-18 | Short -circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205195253U true CN205195253U (en) | 2016-04-27 |
Family
ID=55788209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520918731.4U Expired - Fee Related CN205195253U (en) | 2015-11-18 | 2015-11-18 | Short -circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205195253U (en) |
-
2015
- 2015-11-18 CN CN201520918731.4U patent/CN205195253U/en not_active Expired - Fee Related
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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: 20160427 Termination date: 20191118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |