CN106683318A - Fault arc fire alarm detector - Google Patents
Fault arc fire alarm detector Download PDFInfo
- Publication number
- CN106683318A CN106683318A CN201710169791.4A CN201710169791A CN106683318A CN 106683318 A CN106683318 A CN 106683318A CN 201710169791 A CN201710169791 A CN 201710169791A CN 106683318 A CN106683318 A CN 106683318A
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- China
- Prior art keywords
- signal
- electric arc
- fire alarm
- output
- fault electric
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire Alarms (AREA)
Abstract
The invention belongs to the field of fault arc fire alarming. A fire alarm detector is installed on a power supply circuit of a place where a fire alarm is needed, the power supply circuit penetrates through a detection hole of the fault arc fire alarm detector, a coil or a Hall device wound around the detection hole so as to be wound around the power supply circuit inside the alarm detector detects magnetic field signals around a power supply wire, the signals are processed, a hardware circuit is used for comparing the signals and judging whether the signals include signals with arc signal features or not, and if the signals with the arc signal features are detected, the arc alarm signals are output. The alarm signals for small-arc alarming and large-arc alarming are included, and the detector can be used for single-phase and three-phase power supply systems.
Description
Technical field
This project is related to fault electric arc detection and fault electric arc fire alarm.
Background technology
The electrical fire that fault electric arc causes grows with each passing day.It is circuit aging to cause fault electric arc, so as to the electric fire for causing
Calamity occupies highest ratio in all fire incidents.Accordingly, it would be desirable to invention automatic detection is out of order electric arc so as to carry out fire
The fault electric arc fire alarm detector of warning, so as to reduce and avoid the generation of appliance fire automatically.Fault electric arc fire report
Police's detector, will be in any product for needing and detecting electric arc used as the general key device of fault electric arc fire-alarm.
Present fire-alarm does not also have arc-detection function, is typically entered when there is fire by sensors such as cigarette, light, temperature
Row detection.Fault electric arc fire alarm detector is that the electromagnetic sensor by being placed on around electrical conductor detects electric current
Information, the method by judging signal characteristic, when just there is electric arc, detects the signal, and alarm, or further cut-out
Power supply.
The content of the invention
The general thought of invention is as follows：Fire alarm detection is installed on the power supply circuits in place for needing fire-alarm
Device, power supply circuits through fault electric arc fire alarm detector detection hole, the built-in circular detection hole of alarm detector from
And the detection coil around power supply circuits detects field signal around current supply line, the signal through processing, multilevel iudge
Whether containing the signal with arc signal feature in signal, if detecting the signal containing arc signal feature, just export
Electric arc alarm signal.Fault electric arc fire alarm detector there is little electric arc to report to the police and big electric arc two signal output parts of warning,
Within the short time for just electric arc occurring, little electric arc warning output alarm signal, after electric arc is continued for some time, big electric arc is reported to the police defeated
Go out alarm signal.As shown in figure 1, topmost portion is fault electric arc fire alarm detector and 4 detected square copper conductors
Combine the combination of work.4 rectangular scapus being placed in parallel are switched on copper post wire in figure, distinguish from left to right
It is A, B, C phase firewire and center line.Detection hole of 4 copper post wires through fault electric arc fire alarm detector.On the right side of upper figure
12 winding displacement output signals, winding displacement is one group per 4 from top to bottom, is divided into three groups, and A, B, C three-phase are correspond to respectively.It is wherein every
Group front both threads be the duration it is short little electric arc alarm signal output, afterwards two be duration length big electric arc alarm signal
Number output.Both threads on the left of upper figure are the input lines of 220 volts of power supplys.The object of mid portion is fault electric arc fire report in figure
The front view of the assembly of alert detector and energization copper post wire.Nethermost two figures are by fault electric arc fire alarm in figure
Detector cut open after internal structure, it can be seen that on the detection hole that A, B, C phase copper post wire are passed through, in the inside of detector
A detection coil is covered respectively, and equivalent to being enclosed within copper post wire, the coil adopts air core coil to the coil.Circuit board
It is placed on most inboard, the normal direction of circuit board is parallel with 4 copper post wires.Magnetic is produced around the energized conductor of curent change
, when either in parallel or serial arc is produced in circuit, the electric current in conductor all can quickly change.This change is fast
In fastly reacting the magnetic field around.Therefore as long as can accurately detect the change in magnetic field around energized conductor and magnetic field
Rate can just obtain the related information of electric arc.The rate of change in the magnetic field around current－carrying conductor is detected using air core coil, it is hollow
The signal that Coil Detector goes out is linear with the differential of operating current, and to signal characteristic abstraction two ways can be adopted：The
A kind of mode, feature extraction is carried out using hardware to signal, and signal is compared with thresholding, so as to detect arc signal.
Air core coil output signal, signal input gives a high-pass filter, thus carries the high-frequency characteristic of the differential of operating current
Take out.By one amplifying circuit being made up of operational amplifier and capacitance resistance ware of the signal input.The signal output give by
One input of the comparator 1 that operational amplifier is constituted, another input input fixed level of comparator 1, positive reason
Under condition, the output signal of amplifier is very low more than the probability of comparison threshold, or hardly exceedes comparison threshold, comparator 1
Signal output almost always for low, such signal integration in time can be very low.In the event of electric arc, have a large amount of
The signal input higher than the thresholding of comparator 1, at this moment the signal output of comparator 1 substantial amounts of high level, such letter occurs
Integration number in time can be very high.Comparator 1 outputs signal to the active integration being made up of operational amplifier and capacitance resistance ware
Circuit, then the result of integration is exported again the comparator 2 and comparator 3 being made up of amplifier to another two, and comparator 2 and 3 is defeated
The signal for going out passes through the emitter follower being made up of transistor, controlled output signal relay 1 and 2.Comparator 2 and 3
Difference is that 2 comparison threshold level can be much lower than 3.When arc signal comes, first comparator 2 is with very big general
Rate exports high level, so as to promote the adhesive of relay 1, output to detect the alarm signal of faint electric arc.If electric arc is lasting
Time is very long, and at this moment comparator 3 can also export high level, promotes the output of relay 2 to detect the alarm signal of hard arc.It is right
The second way that signal characteristic abstraction can be adopted is as follows：Signal is divided into two paths of signals after being exported by detection coil, all the way Jing
The signal amplifier being made up of amplifier and Resistor-Capacitor Unit is crossed, it is integrated laggard subsequently into the active integrator being made up of amplifier
Enter CPU.Another road is through high-pass filter, the signal amplifier for then constituting through amplifier and Resistor-Capacitor Unit, after amplification
Into CPU.Two-way amplifies and all have automatic gain control function.CPU by first via signal respectively time-domain and frequency domain with
The typical time-domain of arc signal and the signal of frequency domain of sampling in advance is matched, and correlation function is sought, if it find that phase
Close function and be more than threshold value set in advance, be judged as being found that arc signal.CPU is previously set second road signal with one
Good threshold value is compared, and if greater than the threshold value, just further judgement is found that arc signal, output alarm signal.In list
In phase system, detection hole is changed to two, and one is live wire detection hole, and one is zero line detection hole.Detection coil can be band magnetic
The coil, or hall device of core.
Description of the drawings
Fig. 1 is fault electric arc fire alarm detector arrangement figure.
Specific embodiment
Hough transform hole is the situation for using square type wire, if during using circular or other shapes of wire.Wear
The detection hole of wire can make the shape consistent with the wire cross-section area for passing through into.Existing shape can also be kept, as long as
Wire can be through just can be with.Air core coil has dynamic range very big, is not easy very much saturation, there's almost no magnetic hysteresis and shows
As the non-constant width of Hz-KHz, the linearity is fine, the extraordinary feature of temperature stability.The bandwidth requirement of signal amplification channel is big
In 50 ~ 100KHZ.Multiplication factor at 2000 ~ 5000 times or so, and with more than 40db automatic growth control.Output after
Electrical equipment is 5 amperes by electric current.The plastic manufacturing that shell can be penetrated using electromagnetic wave, after the completion of wiring board debugging, is carried out
Assembling, then whole product seals into an entirety by casting glue.Fault electric arc fire alarm detector may be mounted at power supply electricity
On the wire on road, it is also possible in the power distribution cabinet or power distribution station of building.A kind of embodiment therein is used in homogeneous ststem
The fault electric arc fire alarm detector with double detection holes in system.
Claims (8)
1. a kind of fault electric arc fire alarm detector, it is characterised in that in the power supply circuits in the place for needing fire-alarm
Upper installation fault electric arc fire alarm detector, power supply circuits pass through a kind of detection hole of fault electric arc fire alarm detector,
The built-in circular detection hole of fault electric arc fire alarm detector is so as to around the detection coil of power supply circuits detection current supply line
Whether the field signal of surrounding, the signal contains the signal with arc signal feature, such as through processing in multilevel iudge signal
Fruit detects the signal containing arc signal feature, just output electric arc alarm signal.
2. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that fault electric arc fire report
Alert detector combines work with 4 detected square copper conductors, and 4 copper conductors are examined through fault electric arc fire alarm
Survey device detection hole, 12 winding displacement output alarm signals on the right side of fault electric arc fire alarm detector, winding displacement from top to bottom,
It is one group per 4, is divided into three groups, correspond to A respectively, B, C three-phase, per group of front both threads are duration short little electric arc reports
Alert signal output lead, afterwards two be duration length big electric arc alarm signal output lead, the both threads in left side are 220 volts
The input line of power supply.
3. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that in detector
Portion, on the detection hole that A, B, C phase copper post wire are passed through, covers respectively a detection coil, and the coil is equivalent to being enclosed within copper
On post wire, the coil adopts air core coil, and the rate of change in the magnetic field around current－carrying conductor is detected using air core coil, empty
The differential of the electric current on the signal that wire-core coil is detected and copper post wire is linear, and detection coil can also be with magnetic core
Coil, or hall device.
4. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that using hardware to signal
Feature extraction is carried out, signal is compared with thresholding, so as to detect arc signal, air core coil output signal, signal is defeated
Enter to a high-pass filter, thus extract the high-frequency characteristic of the differential of operating current, by the signal input one
The individual amplifying circuit being made up of operational amplifier and capacitance resistance ware, the comparator 1 for being then output to be made up of operational amplifier
One input, another input input fixed level of comparator 1, under normal circumstances, the output signal of amplifier exceedes
The probability of comparison threshold is very low, or hardly exceedes comparison threshold, the signal output of comparator 1 almost always for low, this
The signal of sample integration in time can be very low, in the event of electric arc, has the substantial amounts of signal higher than the thresholding of comparator 1 defeated
Enter, at this moment the signal output of comparator 1 occurs substantial amounts of high level, and such signal integration in time can be very high, than
The active integrating circuit being made up of operational amplifier and capacitance resistance ware is outputed signal to compared with device 1, it is then again that the result of integration is defeated
Go out the comparator 2 and comparator 3 being made up of amplifier to another two, the signal of the output of comparator 2 and 3 is passed through by transistor structure
Into emitter follower, controlled output signal relay 1 and 2, the difference of comparator 2 and 3 is 2 comparison threshold level
Can it is much lower than 3, when arc signal comes, comparator 2 first with very big probability output high level, so as to promote relay
The adhesive of device 1, output detects the alarm signal of faint electric arc, if electric arc duration is very long, at this moment comparator 3 also can
Output high level, promotes the output of relay 2 to detect the alarm signal of hard arc.
5. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that to signal characteristic abstraction
The second way that can be adopted is as follows, and signal is divided into two paths of signals after being exported by detection coil, all the way through by amplifier and resistance
Hold element composition signal amplifier, subsequently into the active integrator being made up of amplifier, it is integrated after enter CPU, Ling Yilu
Through high-pass filter, the signal amplifier for then constituting through amplifier and Resistor-Capacitor Unit, through being amplified into CPU, two-way
Amplify and all have automatic gain control function, CPU is by first via signal respectively in time-domain and frequency domain and the advance electricity sampled
The typical time-domain of arc signal and the signal of frequency domain carry out asking the computing of correlation function, if it find that correlation function is more than pre-
The threshold value for first setting, is judged as being found that arc signal, CPU carries out second road signal with a threshold value being previously set
Relatively, if greater than the threshold value, just further judgement is found that arc signal, output alarm signal.
6. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that signal amplification channel
Bandwidth requirement be more than 50 ~ 100KHZ, multiplication factor at 2000 ~ 5000 times or so, and with more than 40db automatic gain control
System.
7. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that detection hole is rectangular opening
It is the situation for using rectangular conductor, if using circular or other shapes of wire, perforating the detection hole of line can make into
The shape consistent with the wire cross-section area for passing through, it is also possible to keep existing shape, if wire can through just can be with,
Can be used in single phase power supply system, be designed with a kind of fault electric arc fire alarm detector in double detection holes.
8. a kind of fault electric arc fire alarm detector according to claim 1, it is characterised in that fault electric arc fire report
Alert detector may be mounted on the wire of power supply circuits, it is also possible in the power distribution cabinet or power distribution station of building.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169791.4A CN106683318A (en) | 2017-03-21 | 2017-03-21 | Fault arc fire alarm detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169791.4A CN106683318A (en) | 2017-03-21 | 2017-03-21 | Fault arc fire alarm detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106683318A true CN106683318A (en) | 2017-05-17 |
Family
ID=58829149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710169791.4A Pending CN106683318A (en) | 2017-03-21 | 2017-03-21 | Fault arc fire alarm detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106683318A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541418A (en) * | 2019-01-17 | 2019-03-29 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor and fault arc detection method |
| WO2023103027A1 (en) * | 2021-12-10 | 2023-06-15 | 北京腾锐视讯科技有限公司 | Fault arc detection apparatus |
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| JP2003172762A (en) * | 2001-12-10 | 2003-06-20 | Osaka Gas Co Ltd | Abnormality detection circuit for microcomputer |
| CN101706527A (en) * | 2009-10-30 | 2010-05-12 | 西安交通大学 | Method for detecting arc faults based on time-frequency characteristics of high-frequency current component |
| CN104215826A (en) * | 2014-06-05 | 2014-12-17 | 张天福 | Faulted arc type electrical fire monitoring detector and faulted arc recognition and alarm method |
| CN104730433A (en) * | 2013-12-23 | 2015-06-24 | 森萨塔科技麻省公司 | Noise propagation immunity of multi-string arc fault detection device |
| CN105259446A (en) * | 2015-11-04 | 2016-01-20 | 北京腾锐视讯科技有限公司 | Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector |
| CN105954624A (en) * | 2016-06-17 | 2016-09-21 | 丰郅(上海)新能源科技有限公司 | Detection device |
-
2017
- 2017-03-21 CN CN201710169791.4A patent/CN106683318A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003172762A (en) * | 2001-12-10 | 2003-06-20 | Osaka Gas Co Ltd | Abnormality detection circuit for microcomputer |
| CN101706527A (en) * | 2009-10-30 | 2010-05-12 | 西安交通大学 | Method for detecting arc faults based on time-frequency characteristics of high-frequency current component |
| CN104730433A (en) * | 2013-12-23 | 2015-06-24 | 森萨塔科技麻省公司 | Noise propagation immunity of multi-string arc fault detection device |
| CN104215826A (en) * | 2014-06-05 | 2014-12-17 | 张天福 | Faulted arc type electrical fire monitoring detector and faulted arc recognition and alarm method |
| CN105259446A (en) * | 2015-11-04 | 2016-01-20 | 北京腾锐视讯科技有限公司 | Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector |
| CN105954624A (en) * | 2016-06-17 | 2016-09-21 | 丰郅(上海)新能源科技有限公司 | Detection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541418A (en) * | 2019-01-17 | 2019-03-29 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor and fault arc detection method |
| WO2023103027A1 (en) * | 2021-12-10 | 2023-06-15 | 北京腾锐视讯科技有限公司 | Fault arc detection apparatus |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20170517 |