CN101694738A - Method and system for electric fire alarm - Google Patents
Method and system for electric fire alarm Download PDFInfo
- Publication number
- CN101694738A CN101694738A CN200910210834A CN200910210834A CN101694738A CN 101694738 A CN101694738 A CN 101694738A CN 200910210834 A CN200910210834 A CN 200910210834A CN 200910210834 A CN200910210834 A CN 200910210834A CN 101694738 A CN101694738 A CN 101694738A
- Authority
- CN
- China
- Prior art keywords
- signal
- amplifier
- wave filter
- chip microcomputer
- sends
- 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.)
- Pending
Links
Images
Landscapes
- Alarm Systems (AREA)
Abstract
The invention discloses a method and a system for electric fire alarm. A current transformer transmits electric leakage signals produced by the current transformer to a filter; the filter filters a fundamental wave signal out of the electric leakage signals and transmits the fundamental wave signal to a single chip microcomputer; the single chip microcomputer compares an electric level of the fundamental wave signal with an alarm set value and judges whether an alarm indication is needed or not. By adopting the technical scheme of the invention, the method and the system for electric fire alarm can extract and respectively process fundamental waves and main harmonic waves of the electric leakage signals, more accurately detect the actual electric leakage signals, and greatly improve the reliability and stability of electric leakage signal detection, thereby enhancing product quality.
Description
Technical field
The present invention relates to the fire alarm technical field, relate in particular to a kind of electric fire alarm method and system.
Background technology
Along with the fast development of Chinese national economy, the rapid raising of living standards of the people, consumer rolls up, and power consumption also increases year by year, and the electrical fire that electric wiring directly or indirectly causes also increases thereupon.According to the related data statistics, in 115 fire as evaluation in 2002, electrical fire accounts for 95.As seen the strick precaution of strengthening electrical fire is extremely urgent, and the electrical fire cause is more, comprises short circuit, overheated, electric leakage, thunderbolt and electric fault etc., and fire hazard is also bigger, so the fire that a variety of causes causes all should obtain control.
At present, safeguard measures such as short circuit, overheated, thunderbolt are day by day ripe, and because the ubiquity of normal Leakage Current, electric leakage does not often cause enough attention, thereby causes fire to take place.So the warning system that the employing leakage current detected, provided fire alarm is very necessary, existing electric fire monitoring system is also relatively backward for the fire hazard monitoring technology that electric leakage produces, and reliability is not high.General detection of electrical leakage equipment is regardless of the first-harmonic and the harmonic signal of electric leakage signal, but its waveform signal that synthesizes is handled together, owing to the interference of harmonic signal, has influenced the reliability of its detection.
Summary of the invention
The objective of the invention is to propose a kind of electric fire alarm method and system, the first-harmonic of electric leakage signal and main harmonic wave can be taken out, handle respectively, detect actual electric leakage signal more accurately, improve the reliability and stability that electric leakage signal detects greatly, thereby improved the quality of product.
For reaching this purpose, the present invention by the following technical solutions:
A kind of electric fire alarm method may further comprise the steps:
A, current transformer send to wave filter with the electric leakage signal of its generation;
B, wave filter filter out the fundamental signal in the electric leakage signal, send to single-chip microcomputer;
C, single-chip microcomputer compare fundamental signal level and alarm setting value, need to judge whether the indication of reporting to the police.
Further comprising the steps of:
Wave filter filters out the harmonic signal in the electric leakage signal, sends to single-chip microcomputer;
Single-chip microcomputer shows the harmonic signal value.
Described harmonic signal comprises 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal.
A kind of electric fire alarm system, comprise current transformer, input circuit, first AC amplifier, first wave filter, second AC amplifier, detection filter circuit, direct current amplifier, analog to digital converter, single-chip microcomputer, alarm settings device and indicating equipment
Wherein, current transformer, input circuit, first AC amplifier, first wave filter, second AC amplifier, detection filter circuit, direct current amplifier, analog to digital converter, single-chip microcomputer are connected successively with indicating equipment, and the alarm settings device is connected with single-chip microcomputer,
Current transformer is used for testing circuit, and the generation electric leakage signal sends to input circuit;
Input circuit is used for electric leakage signal is sent to first AC amplifier;
First AC amplifier is used for electric leakage signal is carried out linear amplification, sends to first wave filter;
First wave filter is used for the fundamental signal of electric leakage signal is leached, and sends to second AC amplifier;
Second AC amplifier is used for fundamental signal is amplified, and sends to detection filter circuit;
Detection filter circuit is used for converting fundamental signal to direct current signal, and sends to direct current amplifier;
Direct current amplifier is used for the first-harmonic direct current signal is amplified, and sends to analog to digital converter;
Analog to digital converter is used for fundamental signal is carried out analog to digital conversion, and the numerical value of fundamental signal is sent to single-chip microcomputer;
The alarm settings device is used to be provided with alarm setting value, and sends to single-chip microcomputer;
Single-chip microcomputer is used for the numerical value of fundamental signal and alarm setting value are compared, and according to comparative result control indicating equipment;
Indicating equipment is used for according to the indication of reporting to the police of the control signal of single-chip microcomputer.
Also comprise second wave filter and gauge tap, wherein, the input end of second wave filter is connected with the output terminal of first AC amplifier, the output terminal of second wave filter is connected with the input end of gauge tap, the input end of gauge tap also is connected with the output terminal of first wave filter, the output terminal of gauge tap is connected with the input end of second AC amplifier
3 rd harmonic signal that second wave filter is used for electric leakage signal that first AC amplifier is sent leach, and send to gauge tap;
Gauge tap is used to control the fundamental signal and the harmonic signal timesharing of will receive and sends to second AC amplifier;
Second AC amplifier also is used for harmonic signal is amplified, and sends to detection filter circuit;
Detection filter circuit also is used for converting harmonic signal to direct current signal, and sends to direct current amplifier;
Direct current amplifier also is used for the harmonic wave direct current signal is amplified, and sends to analog to digital converter;
Analog to digital converter also is used for harmonic signal is carried out analog to digital conversion, and the numerical value of harmonic signal is sent to single-chip microcomputer;
Single-chip microcomputer also is used for the numerical value of harmonic signal is sent to indicating equipment;
Indicating equipment also is used for the numerical value of the harmonic signal of single-chip microcomputer transmission is shown.
Also comprise being no less than 1 wave filter, in parallel with first wave filter and second wave filter, be used for leaching 5 subharmonic and 7 subharmonic of electric leakage signal.
Indicating equipment comprises display device, hummer, pilot lamp and/or 485 interface arrangements.
Adopted technical scheme of the present invention, by different wave filters, the first-harmonic of electric leakage signal and main harmonic wave are taken out, handle respectively, can detect actual electric leakage signal more accurately, improve the reliability and stability that electric leakage signal detects greatly, thereby improve the quality of product, and the harmonic signal numerical value of measuring, for providing foundation by utilizing inverse voltage to suppress harmonic wave.
Description of drawings
Fig. 1 is the structural representation of electric fire alarm system in the specific embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the structural representation of electric fire alarm system in the specific embodiment of the invention.As shown in Figure 1, this electric fire alarm system comprises current transformer 101, input circuit 102, first AC amplifier 103, first wave filter 104, second wave filter 105, the 3rd wave filter 106, the 4th wave filter 107, gauge tap 108, second AC amplifier 109, detection filter circuit 110, direct current amplifier 111, analog to digital converter 112, single-chip microcomputer 113, alarm settings device 114 and indicating equipment 115.
Current transformer is installed on the circuit, current transformer, the input circuit and first AC amplifier are linked in sequence successively, the output terminal of first AC amplifier respectively with first wave filter, second wave filter, the 3rd wave filter is connected with the input end of the 4th wave filter, first wave filter, second wave filter, the 3rd wave filter and the 4th wave filter adopt parallel way, first wave filter, second wave filter, the output terminal of the 3rd wave filter and the 4th wave filter is connected with the input end of gauge tap respectively, gauge tap, second AC amplifier, detection filter circuit, direct current amplifier, analog to digital converter, single-chip microcomputer is connected successively with indicating equipment, and the alarm settings device is connected with single-chip microcomputer.
Indicating equipment further comprises display device 121, hummer 122, pilot lamp 123 and 485 interface arrangements 124.
The workflow of this electric fire alarm system is as follows:
The current transformer testing circuit produces electric leakage signal and sends to input circuit.
Input circuit sends to first AC amplifier with electric leakage signal and carries out linear amplification, sends to the input end of first wave filter, second wave filter, the 3rd wave filter and the 4th wave filter again.
First wave filter leaches the fundamental signal in the electric leakage signal, and second wave filter leaches 3 rd harmonic signal in the electric leakage signal, and the 3rd wave filter leaches 5 rd harmonic signal in the electric leakage signal, and the 4th wave filter leaches 7 rd harmonic signal in the electric leakage signal.
The output signal of first wave filter, second wave filter, the 3rd wave filter and the 4th wave filter all is input to gauge tap, and gauge tap sends to second AC amplifier with fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal that receive according to time-sharing format.
Second AC amplifier is used for fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal are amplified, and sends to detection filter circuit.
Detection filter circuit converts fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal to direct current signal, sends to direct current amplifier.
Direct current amplifier amplifies the direct current signal that fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 subharmonic convert to, sends to analog to digital converter.
Analog to digital converter carries out analog to digital conversion to fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal, and the numerical value of fundamental signal, 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal is sent to single-chip microcomputer.
The alarm settings device is provided with alarm setting value, and sends to single-chip microcomputer.
Whether single-chip microcomputer compares the numerical value and the alarm setting value of fundamental signal level on the one hand, and report to the police according to comparative result control indicating equipment; On the other hand the numerical value of 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal being issued indicating equipment shows.
Indicating equipment is used for according to the indication of reporting to the police of the control signal of single-chip microcomputer, display device display alarm signal wherein, the numerical value that also can show 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal simultaneously, hummer sends warning, pilot lamp carries out display alarm, and 485 interface arrangements are used for carrying out communication contact with watch-dog.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (7)
1. an electric fire alarm method is characterized in that, may further comprise the steps:
A, current transformer send to wave filter with the electric leakage signal of its generation;
B, wave filter filter out the fundamental signal in the electric leakage signal, send to single-chip microcomputer;
C, single-chip microcomputer compare fundamental signal level and alarm setting value, need to judge whether the indication of reporting to the police.
2. a kind of electric fire alarm method according to claim 1 is characterized in that, and is further comprising the steps of:
Wave filter filters out the harmonic signal in the electric leakage signal, sends to single-chip microcomputer;
Single-chip microcomputer shows the harmonic signal value.
3. a kind of electric fire alarm method according to claim 2 is characterized in that described harmonic signal comprises 3 rd harmonic signal, 5 rd harmonic signal and 7 rd harmonic signal.
4. electric fire alarm system, it is characterized in that, comprise current transformer, input circuit, first AC amplifier, first wave filter, second AC amplifier, detection filter circuit, direct current amplifier, analog to digital converter, single-chip microcomputer, alarm settings device and indicating equipment
Wherein, current transformer, input circuit, first AC amplifier, first wave filter, second AC amplifier, detection filter circuit, direct current amplifier, analog to digital converter, single-chip microcomputer are connected successively with indicating equipment, and the alarm settings device is connected with single-chip microcomputer,
Current transformer is used for testing circuit, and the generation electric leakage signal sends to input circuit;
Input circuit is used for electric leakage signal is sent to first AC amplifier;
First AC amplifier is used for electric leakage signal is carried out linear amplification, sends to first wave filter;
First wave filter is used for the fundamental signal of electric leakage signal is leached, and sends to second AC amplifier;
Second AC amplifier is used for fundamental signal is amplified, and sends to detection filter circuit;
Detection filter circuit is used for converting fundamental signal to direct current signal, and sends to direct current amplifier;
Direct current amplifier is used for the first-harmonic direct current signal is amplified, and sends to analog to digital converter;
Analog to digital converter is used for fundamental signal is carried out analog to digital conversion, and the numerical value of fundamental signal is sent to single-chip microcomputer;
The alarm settings device is used to be provided with alarm setting value, and sends to single-chip microcomputer;
Single-chip microcomputer is used for the numerical value of fundamental signal and alarm setting value are compared, and according to comparative result control indicating equipment;
Indicating equipment is used for according to the indication of reporting to the police of the control signal of single-chip microcomputer.
5. a kind of electric fire alarm according to claim 4 system, it is characterized in that, also comprise second wave filter and gauge tap, wherein, the input end of second wave filter is connected with the output terminal of first AC amplifier, and the output terminal of second wave filter is connected with the input end of gauge tap, and the input end of gauge tap also is connected with the output terminal of first wave filter, the output terminal of gauge tap is connected with the input end of second AC amplifier
3 rd harmonic signal that second wave filter is used for electric leakage signal that first AC amplifier is sent leach, and send to gauge tap;
Gauge tap is used to control the fundamental signal and the harmonic signal timesharing of will receive and sends to second AC amplifier;
Second AC amplifier also is used for harmonic signal is amplified, and sends to detection filter circuit;
Detection filter circuit also is used for converting harmonic signal to direct current signal, and sends to direct current amplifier;
Direct current amplifier also is used for the harmonic wave direct current signal is amplified, and sends to analog to digital converter;
Analog to digital converter also is used for harmonic signal is carried out analog to digital conversion, and the numerical value of harmonic signal is sent to single-chip microcomputer;
Single-chip microcomputer also is used for the numerical value of harmonic signal is sent to indicating equipment;
Indicating equipment also is used for the numerical value of the harmonic signal of single-chip microcomputer transmission is shown.
6. a kind of electric fire alarm according to claim 5 system is characterized in that, also comprises being no less than 1 wave filter, and is in parallel with first wave filter and second wave filter, is used for leaching 5 subharmonic and 7 subharmonic of electric leakage signal.
7. a kind of electric fire alarm according to claim 4 system is characterized in that indicating equipment comprises display device, hummer, pilot lamp and/or 485 interface arrangements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210834A CN101694738A (en) | 2009-11-11 | 2009-11-11 | Method and system for electric fire alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210834A CN101694738A (en) | 2009-11-11 | 2009-11-11 | Method and system for electric fire alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101694738A true CN101694738A (en) | 2010-04-14 |
Family
ID=42093706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910210834A Pending CN101694738A (en) | 2009-11-11 | 2009-11-11 | Method and system for electric fire alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101694738A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049172A (en) * | 2014-06-18 | 2014-09-17 | 公安部四川消防研究所 | Method for judging ignition source of electrical fire caused by poor-contact discharging arc |
| CN105572532A (en) * | 2015-12-17 | 2016-05-11 | 南京亚派科技股份有限公司 | Residual current sampling value processing method for electrical fire hazard monitoring product |
| CN108089087A (en) * | 2017-12-19 | 2018-05-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
| CN110011271A (en) * | 2017-12-01 | 2019-07-12 | Ls产电株式会社 | Earth leakage breaker |
-
2009
- 2009-11-11 CN CN200910210834A patent/CN101694738A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049172A (en) * | 2014-06-18 | 2014-09-17 | 公安部四川消防研究所 | Method for judging ignition source of electrical fire caused by poor-contact discharging arc |
| CN105572532A (en) * | 2015-12-17 | 2016-05-11 | 南京亚派科技股份有限公司 | Residual current sampling value processing method for electrical fire hazard monitoring product |
| CN110011271A (en) * | 2017-12-01 | 2019-07-12 | Ls产电株式会社 | Earth leakage breaker |
| CN110011271B (en) * | 2017-12-01 | 2021-06-04 | Ls产电株式会社 | Earth leakage circuit breaker |
| CN108089087A (en) * | 2017-12-19 | 2018-05-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
| CN108089087B (en) * | 2017-12-19 | 2019-11-29 | 北京中交国通智能交通系统技术有限公司 | A kind of electric leakage monitoring and guard method suitable for low-voltage power supply and distribution system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140216157A1 (en) | Method for Determining Arc Discharge as well as Failure of Mechanical Vibration and Abnormal Displacement in Power Equipment Using Acoustic Energy Feature | |
| CN201247278Y (en) | On-line monitoring device for grounding current of transformer iron core | |
| CN201909667U (en) | Running status voice and local electro-discharge online monitoring and analyzing device of transformer | |
| CN204214985U (en) | The detection of electrical leakage of AC low voltage power switch box and electric shock prior-warning device | |
| CN101694738A (en) | Method and system for electric fire alarm | |
| CN204214972U (en) | A kind of magnet controlled reactor on-line monitoring system | |
| CN205404706U (en) | Electric automobile fills electric pile's electric energy quality dynamic monitoring system based on DSP | |
| CN110596447A (en) | Electric field measurement-based charged equipment surrounding safety detection device and detection method thereof | |
| CN201667107U (en) | Electrical fire alarm device | |
| CN204631187U (en) | A kind of buried high-tension cable partial discharge monitoring and positioning system | |
| KR101954273B1 (en) | A Smart Cabinet Panel System | |
| CN107490748A (en) | A kind of overhead transmission line lightning monitoring device based on snap ring power taking technology | |
| CN102759681A (en) | Transformer core ground fault monitoring device | |
| CN112824913A (en) | Aging detection system for transformer insulation | |
| CN202676845U (en) | Device for monitoring earth fault of transformer core | |
| CN205176134U (en) | Join in marriage net harmonic monitoring facilities | |
| CN213302351U (en) | Residual current collecting device of low-voltage alternating-current power supply system of transformer substation | |
| CN104655994B (en) | GIS partial discharge on-line monitoring systems | |
| CN204228893U (en) | A kind of PD On-Line Measurement System | |
| CN208314124U (en) | A kind of local discharge detection device | |
| CN202350904U (en) | Integrated vibration transmitter | |
| CN206209053U (en) | Transformer belt electric detection means | |
| CN202050231U (en) | Built-in detecting device of surge protector | |
| CN204649901U (en) | GIS office is placed on line monitoring system | |
| CN202383792U (en) | Electrical fire monitoring detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20100414 |