CN202495741U - Novel electric leakage fire alarm system - Google Patents
Novel electric leakage fire alarm system Download PDFInfo
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- CN202495741U CN202495741U CN2012200247509U CN201220024750U CN202495741U CN 202495741 U CN202495741 U CN 202495741U CN 2012200247509 U CN2012200247509 U CN 2012200247509U CN 201220024750 U CN201220024750 U CN 201220024750U CN 202495741 U CN202495741 U CN 202495741U
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- electric leakage
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Abstract
Disclosed is a novel electric leakage fire alarm system which comprises a zero sequence current transformer for acquiring fault current of lines, an electric leakage protection circuit and an electric leakage pre-alarm circuit which are connected to a signal output end of the zero sequence current transformer, and a central control device arranged in a fire control center. The novel electric leakage fire alarm system provided by the utility model is capable of monitoring leakage current in a grid trunk or branch, pre-alarming for electric leakage fire hazard existing in a grid through the electric leakage pre-alarm circuit while carrying out alarm protection effectively on electric leakage fault through the electric leakage protection circuit. Therefore, grid monitoring is made more reasonable, unnecessary fault actions can be prevented, life and production of people can be prevented from being influenced by sudden electricity failure, and economic loss caused by that can be reduced.
Description
Technical field
The utility model relates to the electric fire disaster monitoring technical field, particularly a kind of new pattern creepage fire alarm system.
Background technology
Along with the fast development of Chinese national economy, living standards of the people improve rapidly, and power consumption equipment rolls up, and power consumption also increases year by year, and the electrical fire that electric wiring directly or indirectly causes also increases thereupon.The electrical fire cause is more; Comprise short circuit, overheated, electric leakage, thunderbolt and electric fault etc., at present, safeguard measures such as short circuit, overheated, thunderbolt are day by day ripe; And owing to the aging leaky that produces of cable does not often cause enough attention owing to ubiquity; The leaky that produces owing to cable is aging not only causes the waste of the energy, more possibly cause electrical fire, and so jeopardizes the great security of the lives and property.Existing Electric Leakage Fire Alarm can be reported to the police through the leak current fault of monitoring electrical network main line or branch cable itself; But this kind Electric Leakage Fire Alarm will be in case action will cause the electrical network sudden power; Not only influence people's normal life and production; May cause enormous economic loss for industrial tinuous production, therefore, it is very important that the hidden danger that exists in the electrical network is carried out pre-alarm.
The utility model content
The main purpose of the utility model is the shortcoming that overcomes prior art, and a kind of new pattern creepage fire alarm system that can carry out pre-alarm to the electric leakage disaster hidden-trouble of electrical network main line or branch line existence is provided.
The utility model adopts following technical scheme:
A kind of new pattern creepage fire alarm system includes the zero sequence current mutual inductor that is used to gather the line fault electric current, the leakage protection circuit that is connected in said zero sequence current mutual inductor signal output part and electric leakage prealarm circuit and is located at the center control device at the control center that disappears.
Said leakage protection circuit includes the signal conditioning circuit that is connected in the zero sequence current mutual inductor signal output part, the leakage current indicating device that is connected in the signal conditioning circuit signal output part and fault verification and protective circuit, be connected in the trip gear of fault verification and protective circuit signal output part and be connected in the tripping actuating device and the dropout indicating device of trip gear signal output part, and the signal output part of said dropout indicating device and the signal input part of trip gear are connected in the center control device.
Said electric leakage prealarm circuit includes the signal conditioning circuit that is connected in the zero sequence current mutual inductor signal output part, the leakage current indicating device that is connected in the signal conditioning circuit signal output part and pre-alarm failure determinating circuit and pre-alarm device, and the signal output part of said pre-alarm device is connected in the center control device.
Said signal conditioning circuit includes regulating resistor, filter circuit and rectification circuit, and said filter circuit is " π " mode filter.
Said fault verification and protective circuit and pre-alarm failure determinating circuit include one be connected in the signal conditioning circuit signal output part a unidirectional thyristor and a bridge rectifier; The positive and negative electrode of said unidirectional thyristor is connected with the output of bridge rectifier respectively, and said bridge rectifier input is electrically connected with the city.
The unidirectional thyristor triggering and conducting electric current of said electric leakage prealarm circuit is less than the unidirectional thyristor triggering and conducting electric current of said leakage protection circuit.
Said trip gear includes one and is serially connected with the tripping relay on the loop between said bridge rectifier input and the unidirectional thyristor negative electrode.
Said pre-alarm device includes one and is serially connected with pre-alarm relay on the loop and hand-reset button between said bridge rectifier input and the unidirectional thyristor negative electrode.
Can know by above-mentioned description the utility model; Compared with prior art; The beneficial effect of the utility model is: can monitor electrical network main line or branch line leakage current, when effectively leak current fault being carried out alarm and protection through leakage protection circuit, through the electric leakage prealarm circuit electric leakage disaster hidden-trouble that electrical network exists carried out pre-alarm; Make power system monitor more reasonable; Can prevent unnecessary misoperation, avoid influencing people's life and production, reduce the economic loss that therefore causes because of sudden power.
Description of drawings
Fig. 1 is the overall structure block diagram of the utility model embodiment;
Fig. 2 is the circuit diagram of the leakage protection circuit of the utility model embodiment;
Fig. 3 is the circuit diagram of the electric leakage prealarm circuit of the utility model embodiment.
Among the figure: 1. zero sequence current mutual inductor, 2. center control device, 3. signal conditioning circuit, 4. leakage current indicating device; 5. fault verification and protective circuit, 6. trip gear, 7. tripping actuating device, 8. dropout indicating device; 9. pre-alarm failure determinating circuit, 10. pre-alarm device, 11. unidirectional thyristors, 12. bridge rectifiers; 13. tripping relay, 14. pre-alarm relays, 15. hand-reset buttons.
Embodiment
Below the utility model is done further to describe through embodiment.
With reference to Fig. 1; A kind of new pattern creepage fire alarm system includes the zero sequence current mutual inductor 1 that is used to gather the line fault electric current, the leakage protection circuit that is connected in said zero sequence current mutual inductor 1 signal output part and electric leakage prealarm circuit and is located at the center control device 2 at the control center that disappears.
See figures.1.and.2; Said leakage protection circuit includes the signal conditioning circuit 3 that is connected in zero sequence current mutual inductor 1 signal output part, the leakage current indicating device 4 that is connected in signal conditioning circuit 3 signal output parts and fault verification and protective circuit 5, be connected in the trip gear 6 of fault verification and protective circuit 5 signal output parts and be connected in the tripping actuating device 7 and the dropout indicating device 8 of trip gear 6 signal output parts, and the signal input part of the signal output part of said dropout indicating device 8 and trip gear 6 is connected in center control device 2.
With reference to Fig. 1 and Fig. 3; Said electric leakage prealarm circuit includes the signal conditioning circuit 3 that is connected in zero sequence current mutual inductor 1 signal output part, the leakage current indicating device 4 that is connected in signal conditioning circuit 3 signal output parts and pre-alarm failure determinating circuit 9 and pre-alarm device 10, and the signal output part of said pre-alarm device 10 is connected in center control device 2.
With reference to Fig. 1, Fig. 2 and Fig. 3, said signal conditioning circuit 3 includes regulating resistor, filter circuit and rectification circuit, and said filter circuit is " π " mode filter.Said fault verification and protective circuit 5 and pre-alarm failure determinating circuit 9 include one be connected in signal conditioning circuit 3 signal output parts a unidirectional thyristor 11 and a bridge rectifier 12; The positive and negative electrode of said unidirectional thyristor 11 is connected with the output of bridge rectifier 12 respectively, and said bridge rectifier 12 inputs are electrically connected with the city.Said trip gear 6 includes one and is serially connected with the tripping relay 13 on the loop between said bridge rectifier 12 inputs and unidirectional thyristor 11 negative electrodes.Said pre-alarm device 10 includes one and is serially connected with pre-alarm relay 14 and the hand-reset button 15 on the loop between said bridge rectifier 12 inputs and unidirectional thyristor 11 negative electrodes.The unidirectional thyristor 11 triggering and conducting electric currents of said electric leakage prealarm circuit are less than the unidirectional thyristor 11 triggering and conducting electric currents of said leakage protection circuit.
With reference to Fig. 2; In the said leakage protection circuit; Also be parallel with the trip-gear circuit between bridge rectifier 12 and the civil power, said trip-gear circuit forms said secondary mutual inductor and zero sequence current mutual inductor 1 coaxial winding by resistance, switch and secondary mutual inductor serial connection.
See figures.1.and.2, the Electric Leakage Fire Alarm of the utility model is through zero sequence current mutual inductor 1 detection line residual current, in leakage protection circuit; Signal conditioning circuit 3 is converted into the current signal of zero sequence current mutual inductor 1 output the voltage signal of unidirectional thyristor 11 trigger electrodes of input fault judgement and protective circuit 5; And export the residual current of signal conditioning circuit 3 output to leakage current indicating device 4 simultaneously, and when leakage current during greater than current settings threshold value 300mA, unidirectional thyristor 11 conductings; Because bridge rectifier 12 inputs and unidirectional thyristor 11 negative electrodes have constituted the communication channel of tripping relay 13; Therefore, when unidirectional thyristor 11 conductings, tripping relay 13 gets electronic work; Export a signal to tripping actuating device 7 simultaneously and cut off circuit; One signal of trip gear 6 outputs simultaneously is to the indicating device 8 of threading off, and dropout indicating device 8 is exported a signal to center control device 2, and whether decision resets to trip gear 6 operator on duty at the control center that disappears according to actual conditions again.
With reference to Fig. 1 and Fig. 3; In the electric leakage prealarm circuit; Signal conditioning circuit 3 is converted into the voltage signal of unidirectional thyristor 11 trigger electrodes of input pre-alarm failure determinating circuit 9 with the current signal of zero sequence current mutual inductor 1 output, and exports the residual current of signal conditioning circuit 3 outputs to leakage current indicating device 4 simultaneously, when leakage current during greater than pre-alarm current settings threshold value 200mA; Unidirectional thyristor 11 conductings; Pre-alarm relay 14 gets electronic work, exports pre-alarm signal to center control device 2 simultaneously, reminds the operator on duty at the control center that disappears to carry out the emphasis supervision and take measures necessary to comprise that manual control trip gear 6 cuts off circuit.Simultaneously, can reset through 15 pairs of electric leakages of hand-reset button prealarm circuit.
With reference to Fig. 1, Fig. 2 and Fig. 3; Said signal conditioning circuit 3 operation principles: the residual current signal of zero sequence current mutual inductor 1 being exported through regulating resistor is converted into voltage signal; This voltage signal changes along with zero sequence current mutual inductor 1 detected residual current difference; Also promptly the big I of this voltage reflects the size of residual current indirectly; This voltage signal carries out Filtering Processing through " π " mode filter and eliminates spike and disturb, and carries out obtaining importing behind rectification and the amplitude limit forward voltage signal of unidirectional thyristor 11 trigger electrodes again through rectification circuit.
An above-mentioned embodiment that is merely the utility model, but the design concept of the utility model is not limited thereto allly utilizes this design that the utility model is carried out the change of unsubstantiality, all should belong to the behavior of invading the utility model protection range.
Claims (8)
1. new pattern creepage fire alarm system is characterized in that: include the zero sequence current mutual inductor that is used to gather the line fault electric current, the leakage protection circuit that is connected in said zero sequence current mutual inductor signal output part and electric leakage prealarm circuit and be located at the center control device at the control center that disappears.
2. a kind of new pattern creepage fire alarm system as claimed in claim 1; It is characterized in that: said leakage protection circuit includes the signal conditioning circuit that is connected in the zero sequence current mutual inductor signal output part, the leakage current indicating device that is connected in the signal conditioning circuit signal output part and fault verification and protective circuit, be connected in the trip gear of fault verification and protective circuit signal output part and be connected in the tripping actuating device and the dropout indicating device of trip gear signal output part, and the signal output part of said dropout indicating device and the signal input part of trip gear are connected in the center control device.
3. a kind of new pattern creepage fire alarm system as claimed in claim 2; It is characterized in that: said electric leakage prealarm circuit includes the signal conditioning circuit that is connected in the zero sequence current mutual inductor signal output part, the leakage current indicating device that is connected in the signal conditioning circuit signal output part and pre-alarm failure determinating circuit and pre-alarm device, and the signal output part of said pre-alarm device is connected in the center control device.
4. like claim 2 or 3 described a kind of new pattern creepage fire alarm systems, it is characterized in that: said signal conditioning circuit includes regulating resistor, filter circuit and rectification circuit, and said filter circuit is " π " mode filter.
5. a kind of new pattern creepage fire alarm system as claimed in claim 3; It is characterized in that: said fault verification and protective circuit and pre-alarm failure determinating circuit include one be connected in the signal conditioning circuit signal output part a unidirectional thyristor and a bridge rectifier; The positive and negative electrode of said unidirectional thyristor is connected with the output of bridge rectifier respectively, and said bridge rectifier input is electrically connected with the city.
6. a kind of new pattern creepage fire alarm system as claimed in claim 5 is characterized in that: the unidirectional thyristor triggering and conducting electric current of said electric leakage prealarm circuit is less than the unidirectional thyristor triggering and conducting electric current of said leakage protection circuit.
7. a kind of new pattern creepage fire alarm system as claimed in claim 5 is characterized in that: said trip gear includes one and is serially connected with the tripping relay on the loop between said bridge rectifier input and the unidirectional thyristor negative electrode.
8. a kind of new pattern creepage fire alarm system as claimed in claim 5 is characterized in that: said pre-alarm device includes one and is serially connected with pre-alarm relay on the loop and hand-reset button between said bridge rectifier input and the unidirectional thyristor negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200247509U CN202495741U (en) | 2012-01-19 | 2012-01-19 | Novel electric leakage fire alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200247509U CN202495741U (en) | 2012-01-19 | 2012-01-19 | Novel electric leakage fire alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495741U true CN202495741U (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200247509U Expired - Fee Related CN202495741U (en) | 2012-01-19 | 2012-01-19 | Novel electric leakage fire alarm system |
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| Country | Link |
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| CN (1) | CN202495741U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103927842A (en) * | 2013-01-14 | 2014-07-16 | 孙巍巍 | Novel electrical fire monitoring detector |
| CN104659742A (en) * | 2013-11-15 | 2015-05-27 | 西门子公司 | Residual current device |
-
2012
- 2012-01-19 CN CN2012200247509U patent/CN202495741U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103927842A (en) * | 2013-01-14 | 2014-07-16 | 孙巍巍 | Novel electrical fire monitoring detector |
| CN104659742A (en) * | 2013-11-15 | 2015-05-27 | 西门子公司 | Residual current device |
| CN104659742B (en) * | 2013-11-15 | 2018-04-17 | 西门子公司 | A kind of residual current device |
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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: 20121017 Termination date: 20170119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |