CN106297152A - Multifunction electric fire monitoring system - Google Patents
Multifunction electric fire monitoring system Download PDFInfo
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- CN106297152A CN106297152A CN201610904773.1A CN201610904773A CN106297152A CN 106297152 A CN106297152 A CN 106297152A CN 201610904773 A CN201610904773 A CN 201610904773A CN 106297152 A CN106297152 A CN 106297152A
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Classifications
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
The invention discloses a kind of Multifunction electric fire monitoring system, including power module and the phase line service data acquisition module, On-off signal/output module, communication module and the neutral line current acquisition module that are connected with control module；Power module is powered；Phase line service data acquisition module and neutral line current acquisition module gather electric wiring information incoming control module；Control module is made fire according to the on-off model of the information gathered and switching input module input and is judged, by switching value output module output switch amount output signal, is also externally transmitted by communication module by operation information.The present invention can overall monitor electric wiring service data thus realize fire alarm, multiple functional and electrical isolation is effective, use safety.
Description
Technical field
Present invention relates particularly to a kind of Multifunction electric fire monitoring system.
Background technology
Along with development and the raising of people's living standard of national economy technology, various monitoring systems are the widest
Among the general production being applied to people and life, bring guarantee greatly to the security of the lives and property of country and people.Electrically
Fire monitoring system is as one of of paramount importance safety defense monitoring system, and it has played huge work in the productive life of people
With.
But, current electric fire monitoring system also exists following problem:
1) existing electrical fire safety product is based primarily upon residual current and temperature techniques carries out the report afterwards after fire fault
Alert, stress electric leakage monitoring；And along with Modern Nonlinear load and a large amount of uses of new forms of energy, the harmonic pollution of circuit is very big,
The three-phase imbalance of load is the biggest, and harmonic wave and out-of-balance current all can be superimposed upon on zero line, causes neutral line current to transship, and
And currently safety regulation does not allow to install overcurrent protective device on zero line, thus causes the uncontrollable office of zero line fire
Face；
2) existing product is mainly residual current formula detector and temp.-measuring type detector, function singleness, it is impossible to comprehensive monitoring circuit
Data, it is impossible to line condition is carried out multi-faceted, profound analysis, do not accomplish effective compensation and early warning；
3) voltage difference between each monitoring point of loaded line may the highest, potential safety hazard big, existing product do not solve with
The most complete this difficult problem of isolation that multiple Monitoring Data gathers is realized on one product.
Summary of the invention
It is an object of the invention to provide one can overall monitor electric wiring service data thus realize fire alarm,
Multiple functional and electrical isolation is effective, use safety Multifunction electric fire monitoring system.
This Multifunction electric fire monitoring system that the present invention provides, including power module, control module, phase line
Service data acquisition module, switching input module, switching value output module and communication module, also include that neutral line current gathers mould
Block；Power module powers to described monitoring system；Phase line service data acquisition module, neutral line current acquisition module, switching value are defeated
Enter module, switching value output module and communication module to be all connected with control module；Phase line service data acquisition module and zero line electricity
Stream acquisition module is for gathering the service data information of electric all circuits incoming control module；Control module is according to collecting
Electric wiring service data information and the on-off model of switching input module input make fire and judge, and export control
Signal passes through switching value output module output switch amount output signal, and by the operation information of described monitoring system by communication mould
Block is externally transmitted.
Described Multifunction electric fire monitoring system also includes temperature monitoring module；Temperature monitoring module and control
Module connects, for the operating temperature gathering electric wiring the incoming control module of temperature information that will collect.
If described temperature monitoring module includes main line monitoring temperature branch road；Each road monitoring temperature branch road includes going here and there successively
Temperature heat conduction copper sheet, thermally conductive insulating layer, temperature sensor, temperature wave filter and the temperature collecting cell connect；Temperature heat conduction copper sheet
For measured some temperature of perception, thermally conductive insulating layer is used for temperature transfer and realizes the combined-voltage isolation of 4kV, temperature sensing
Device is for being converted to the temperature signal passed over the resistance signal of correspondence, then is converted to voltage signal through related circuit, so
By temperature filter filtering, then control module is arrived in output after temperature collecting cell processes.
Described phase line service data acquisition module includes that phases line voltage service data acquisition module and phase line current run
Data acquisition module；Described phases line voltage service data acquisition module is for gathering the working voltage data of phase line, phase line current
Service data acquisition module is for gathering the running current data of phase line.
Described Multifunction electric fire monitoring system also includes electrical isolation module；Electrical isolation module includes phase
Line electrical isolation module and neutral line current isolation module；Phase line electrical isolation module be connected to phase line service data acquisition module with
Between the phase line of electric wiring, it is used for isolating electric wiring and described phase line service data acquisition module；Neutral line current isolation mode
Block is connected between neutral line current acquisition module and the zero line of electric wiring, for isolating the zero line of electric wiring and described zero line
Current acquisition module.
Described phase line electrical isolation module includes voltage phase conductor isolation module and electric current phase line isolation module；Voltage phase conductor
Isolation module includes A phase voltage isolation module, B phase voltage isolation module and C phase voltage isolation module；Described electric current phase line every
A phase current isolation module, B phase current isolation module and C phase current isolation module is included from module.
The voltage isolation module of described each phase all includes current-limiting resistance, varistor, isolated voltage transformer, voltage
Transfer resistance and voltage filter, and one end of current-limiting resistance is connected with 1 foot of isolated voltage transformer, another of current-limiting resistance
End is connected with one end of varistor, and the other end of varistor is connected with 2 feet of isolated voltage transformer, isolation voltage mutual inductance
3 feet of device are connected respectively with one end of voltage transfer resistance, one end of voltage filter, 4 feet of isolated voltage transformer and electricity
The pressure other end of transfer resistance, the other end of voltage filter connect respectively.
The module that is galvanically isolated of described each phase all includes isolating current transformer, voltage transfer resistance and phase current filter
Ripple device, and isolation 1 foot of current transformer and 2 feet are connected with outside A phase current input, 3 feet of isolation current transformer and electric
Pressure one end of transfer resistance, one end of phase current wave filter connect respectively, 4 feet of isolation current transformer and voltage transfer resistance
The other end, the other end of phase current wave filter connects respectively.
Described neutral line current isolation module includes isolating current transformer, voltage transfer resistance and neutral line current filtering
Device, isolation 1 foot of current transformer and 2 feet are connected with outside neutral line current input, and 3 feet isolating current transformer turn with voltage
Change one end of resistance, one end of neutral line current wave filter to connect respectively, 4 feet of described isolation current transformer and voltage conversion electricity
The other end of resistance, the other end of neutral line current wave filter connect respectively.
Described phase line service data acquisition module and neutral line current acquisition module all use dedicated version to be IDT90E36
Computation chip, use FFT Fourier Transform Algorithm to carry out the real effective collection of data；Wherein said phase line service data is adopted
Collection module output phase line current, phase line harmonics, phase line first-harmonic, three-phase imbalance, voltage, power, electric energy, residual current are equivalent,
The frequency reference benchmark that phase line electrical quantity gathers is corresponding phase voltage；Neutral line current acquisition module output neutral line current, zero line are humorous
Ripple electric current, zero line fundamental current are equivalent, and the frequency reference benchmark of neutral line current collection is A/B/C three-phase voltage, and it is suitable to press ABC
Sequence, with the most front effectively as reference.If A/B/C three-phase voltage all lacks, then the collection of phase line electrical quantity and neutral line current are adopted
Collection all uses the standard reference frequency of 50Hz.
The present invention provide this Multifunction electric fire monitoring system, can monitor circuit neutral line current and can be right
Zero line is taken precautions against comprehensively, can monitor the harmonic wave of circuit and carry out harmonic wave early warning and harmonic compensation, can monitor the three-phase of circuit not
Balance is gone forward side by side row line load balance analysis, and simultaneously neutral line current, harmonic wave, three-phase imbalance, phase voltage, phase current,
The functions such as power, electric energy and general residual current, multi way temperature have all focused on a product, circuit can be done many-side
Early warning and analysis, it is furthermore achieved that each the most full isolation measuring point, it is ensured that personnel and equipment safety.
Accompanying drawing explanation
Fig. 1 is the present invention high-level schematic functional block diagram when three-phase line is applied.
Detailed description of the invention
It is illustrated in figure 1 the high-level schematic functional block diagram of the present invention: this Multifunction electrical fire that the present invention provides
Monitoring system, including power module, control module, phase line service data acquisition module, switching input module, output switch parameter
Module, communication module, neutral line current acquisition module, temperature monitoring module and electrical isolation module；Power module gives described monitoring
System power supply；Phase line service data acquisition module, neutral line current acquisition module, switching input module, switching value output module
All it is connected with control module with communication module；Phase line service data acquisition module and neutral line current acquisition module are used for gathering electrically
The service data information of all circuits incoming control module；Control module is according to the electric wiring service data information collected
Make fire with the on-off model of switching input module input to judge, and export control signal and pass through switching value output module
Output switch amount output signal, and the operation information of described monitoring system is externally transmitted by communication module；Temperature is supervised
Control module is connected with control module, for the operating temperature gathering electric wiring the temperature information incoming control mould that will collect
Block；Electrical isolation module includes phase line electrical isolation module and neutral line current isolation module；Phase line electrical isolation module is connected to
Between phase line service data acquisition module and the phase line of electric wiring, it is used for isolating electric wiring and adopts with described phase line service data
Collection module；Neutral line current isolation module is connected between neutral line current acquisition module and the zero line of electric wiring, is used for isolating electricity
The zero line of gas circuit and described neutral line current acquisition module.
If temperature monitoring module includes main line monitoring temperature branch road；Each road monitoring temperature branch road includes the temperature being sequentially connected in series
Degree heat conduction copper sheet, thermally conductive insulating layer, temperature sensor, temperature wave filter and temperature collecting cell；Temperature heat conduction copper sheet is used for feeling
Knowing measured some temperature, thermally conductive insulating layer is used for temperature transfer and realizes the combined-voltage isolation of 4kV, and temperature sensor is used for
The temperature signal passed over is converted to the resistance signal of correspondence, then is converted to voltage signal through related circuit, then through temperature
Degree filter filtering, then control module is arrived in output after temperature collecting cell processes.
Phase line service data acquisition module includes that phases line voltage service data acquisition module and phase line current service data are adopted
Collection module；Described phases line voltage service data acquisition module is for gathering the working voltage data of phase line, and phase line current runs number
According to acquisition module for gathering the running current data of phase line.
Phase line electrical isolation module includes voltage phase conductor isolation module and electric current phase line isolation module:
1) voltage phase conductor isolation module includes A phase voltage isolation module, B phase voltage isolation module and C phase voltage isolation module,
Specifically include current-limiting resistance RA1, varistor RVA, isolated voltage transformer PTA, voltage transfer resistance RA2, voltage filter
1, current-limiting resistance RB1, varistor RVB, isolated voltage transformer PTB, voltage transfer resistance RB2, voltage filter 2, current limliting
Resistance RC1, varistor RVC, isolated voltage transformer PTC, voltage transfer resistance RC2, voltage filter 3；Current-limiting resistance RA1
One end be connected with 1 foot of isolated voltage transformer PTA, one end of the other end of current-limiting resistance RA1 and varistor RVA is even
Connecing, the other end of varistor RVA is connected with 2 feet of isolated voltage transformer PTA, 3 feet of isolated voltage transformer PTA and electricity
Pressure one end of transfer resistance RA2, one end of voltage filter 1 connect respectively, and 4 feet of isolated voltage transformer PTA turn with voltage
Change the other end of resistance RA2, the other end of voltage filter 1 connects respectively；One end of current-limiting resistance RB1 and isolation voltage mutual inductance
1 foot of device PTB connects, and the other end of current-limiting resistance RB1 is connected with one end of varistor RVB, the other end of varistor RVB
It is connected with 2 feet of isolated voltage transformer PTB, 3 feet of isolated voltage transformer PTB and one end of voltage transfer resistance RB2, electricity
One end of pressure wave filter 2 connects respectively, 4 feet of isolated voltage transformer PTB and the other end of voltage transfer resistance RB2, voltage
The other end of wave filter 2 connects respectively, and one end of current-limiting resistance RC1 is connected with 1 foot of isolated voltage transformer PTC, current limliting electricity
The other end of resistance RC1 is connected with one end of varistor RVC, and the other end of varistor RVC is with isolated voltage transformer PTC's
2 feet connect, and 3 feet of isolated voltage transformer PTC connect respectively with one end of voltage transfer resistance RC2, one end of voltage filter 3
Connecing, 4 feet of isolated voltage transformer PTC connect respectively with the other end of voltage transfer resistance RC2, the other end of voltage filter 3
Connect；
Varistor RVA, RVB, RVC, for external input voltage is carried out pressure limiting, filter surge voltage；Described current-limiting resistance
RA1, RB1, RC1 for carrying out current limliting and voltage signal being converted into isolated voltage transformer PTA, PTB, PTC to input signal
Receivable milliampere level Small Current Signal；Described isolated voltage transformer PTA, PTB, PTC for receiving milliampere level electricity on former limit
At the milliampere level Small Current Signal of the secondary limit equal size of synchronism output after stream small-signal, and realize high-voltage electrical apparatus isolation；Described electricity
Pressure transfer resistance RA2, RB2, RC2 are for turning isolated voltage transformer PTA, PTB, the milliampere level Small Current Signal on PTC limit
Change millivolt level voltage small-signal into, and synchronism output arrives after voltage filter 1, voltage filter 2, voltage filter 3 filtering
The voltage input circuit of phase line collecting unit and neutral line current collecting unit；
2) electric current phase line isolation module includes A phase current isolation module, B phase current isolation module and C phase current isolation module；
Specifically include isolation Current Transmit A, voltage transfer resistance RA3, phase current wave filter 1, isolate Current Transmit B, electricity
Pressure transfer resistance RB3, phase current wave filter 2, isolate Current Transmit C, voltage transfer resistance RC3, phase current wave filter 3,
Isolation Current Transmit S, voltage transfer resistance RS3 and neutral line current wave filter；1 foot of isolation Current Transmit A and 2 feet
It is connected with outside A phase current input, 3 feet of isolation Current Transmit A and one end of voltage transfer resistance RA3, phase current filter
One end of ripple device 1 connects respectively, 4 feet of isolation Current Transmit A and the other end of voltage transfer resistance RA3, phase current filter
The other end of ripple device 1 connects respectively；1 foot and 2 feet of isolation Current Transmit B are connected with outside B phase current input, isolation electricity
3 feet of current transformer CTB are connected respectively with one end of voltage transfer resistance RB3, one end of phase current wave filter 2, isolate electric current
4 feet of transformer CTB are connected respectively with the other end of voltage transfer resistance RB3, the other end of phase current wave filter 2；Isolation electricity
1 foot and 2 feet of current transformer CTC are connected with outside C phase current input, 3 feet of isolation Current Transmit C and voltage conversion electricity
Resistance one end of RC3, one end of phase current wave filter 3 connect respectively, 4 feet of isolation Current Transmit C and voltage transfer resistance
The other end of RC3, the other end of phase current wave filter 3 connect respectively；1 foot and 2 feet of isolation Current Transmit S remain with outside
Aftercurrent input connects, 3 feet and one end of voltage transfer resistance RS3 of isolation Current Transmit S, residual current wave filter
One end connects respectively, 4 feet and the other end of voltage transfer resistance RS3 of isolation Current Transmit S, residual current wave filter
The other end connects respectively.
Neutral line current isolation module includes isolating Current Transmit N, voltage transfer resistance RN3 and neutral line current filtering
Device, isolation 1 foot of Current Transmit N and 2 feet are connected with outside neutral line current input, isolate Current Transmit N 3 feet and
One end of voltage transfer resistance RN3, one end of neutral line current wave filter connect respectively, 4 feet of isolation Current Transmit N and electricity
The pressure other end of transfer resistance RN3, the other end of neutral line current wave filter connect respectively.
Described Current Transmit A, CTB, CTC, CTS, CTN receive after big current signal at secondary limit synchronism output from former limit
Milliampere level Small Current Signal, and realize high-voltage electrical apparatus isolation；Described voltage transfer resistance RA3, RB3, RC3, RS3 are for isolation
Current Transmit A, CTB, CTC, the milliampere level Small Current Signal on CTS limit are converted into millivolt level voltage small-signal, and through phase
After current filter 1, phase current wave filter 2, phase current wave filter 3, residual current filter filtering, output gathers single to phase line
The electric current input circuit of unit；Described voltage transfer resistance RN3 is for little for the milliampere level electric current on CTN limit of isolated voltage transformer
Signal is converted into millivolt level voltage small-signal, and the electricity of neutral line current collecting unit is arrived in output after neutral line current filter filtering
Stream input circuit.
Described isolated voltage transformer PTA, PTB, PTC are that PCB plug-in mounting measures tailored version 2mA/2mA or similar specification mutual inductance
Device, described isolation Current Transmit A, CTB, CTC, CTS, CTN are that PCB plug-in mounting measures tailored version 1(10) A/1mA or similar rule
Lattice transformer.
The metering that phase line service data acquisition module and neutral line current acquisition module all use dedicated version to be IDT90E36
Chip, uses FFT Fourier Transform Algorithm to carry out the real effective collection of data；Wherein said phase line service data acquisition module
Output phase line current, phase line harmonics, phase line first-harmonic, three-phase imbalance, voltage, power, electric energy, residual current are equivalent, phase line electricity
The frequency reference benchmark of parameter acquisition is corresponding phase voltage；Neutral line current acquisition module output neutral line current, zero line harmonic current,
Zero line fundamental current is equivalent, and the frequency reference benchmark of neutral line current collection is A/B/C three-phase voltage, and presses ABC order, before
Effectively mutually for reference.If A/B/C three-phase voltage all lacks, then the collection of phase line electrical quantity and neutral line current collection all use
The standard reference frequency of 50Hz.
Described switching input module, communication module use light-coupled isolation；Described switching value output module uses electromagnetism
Formula relay is isolated；Power module uses Switching Power Supply, isolates with pulse transformer, and output many groups isolated working voltage gives each
Module, it is ensured that the electrical isolation of each intermodule.
Claims (13)
1. a Multifunction electric fire monitoring system, gathers mould including power module, control module, phase line service data
Block, switching input module, switching value output module and communication module, it is characterised in that also include neutral line current acquisition module；
Power module powers to described monitoring system；Phase line service data acquisition module, neutral line current acquisition module, On-off signal mould
Block, switching value output module and communication module are all connected with control module；Phase line service data acquisition module and neutral line current are adopted
Collection module is for gathering the service data information of electric all circuits incoming control module；Control module is according to the electricity collected
The on-off model of gas line operational data information and switching input module input is made fire and is judged, and exports control signal
By switching value output module output switch amount output signal, and by the operation information of described monitoring system by communication module pair
It is transmitted outward.
Multifunction electric fire monitoring system the most according to claim 1, it is characterised in that also include monitoring temperature
Module；Temperature monitoring module is connected with control module, for the operating temperature gathering electric wiring the temperature letter that will collect
Cease incoming control module.
Multifunction electric fire monitoring system the most according to claim 2, it is characterised in that described monitoring temperature
If module includes main line monitoring temperature branch road；Each road monitoring temperature branch road includes temperature heat conduction copper sheet, the heat conduction being sequentially connected in series
Insulating barrier, temperature sensor, temperature wave filter and temperature collecting cell；Temperature heat conduction copper sheet is used for measured some temperature of perception,
Thermally conductive insulating layer is used for temperature transfer and realizes the combined-voltage isolation of 4kV, and temperature sensor is for the temperature passed over
Degree signal is converted to the resistance signal of correspondence, then is converted to voltage signal through related circuit, then through temperature filter filtering, then
After temperature collecting cell processes, output is to control module.
Multifunction electric fire monitoring system the most according to claim 1, it is characterised in that described phase line is run
Data acquisition module includes phases line voltage service data acquisition module and phase line current service data acquisition module；Described phase line electricity
Pressure service data acquisition module is for gathering the working voltage data of phase line, and phase line current service data acquisition module is used for gathering
The running current data of phase line.
5. according to the Multifunction electric fire monitoring system one of claim 1 ~ 4 Suo Shu, it is characterised in that described is new
Type multifunctional electric fire monitoring system also includes electrical isolation module；Electrical isolation module include phase line electrical isolation module and
Neutral line current isolation module；Phase line electrical isolation module be connected to phase line service data acquisition module and electric wiring phase line it
Between, it is used for isolating electric wiring and described phase line service data acquisition module；Neutral line current isolation module is connected to neutral line current
Between acquisition module and the zero line of electric wiring, for isolating the zero line of electric wiring and described neutral line current acquisition module.
Multifunction electric fire monitoring system the most according to claim 5, it is characterised in that described phase line is electric
Isolation module includes voltage phase conductor isolation module and electric current phase line isolation module；Voltage phase conductor isolation module include A phase voltage every
From module, B phase voltage isolation module and C phase voltage isolation module；Described electric current phase line isolation module includes that A phase current is isolated
Module, B phase current isolation module and C phase current isolation module.
Multifunction electric fire monitoring system the most according to claim 6, it is characterised in that described each phase
Voltage isolation module all includes current-limiting resistance, varistor, isolated voltage transformer, voltage transfer resistance and voltage filter,
And one end of current-limiting resistance is connected with 1 foot of isolated voltage transformer, the other end of current-limiting resistance connects with one end of varistor
Connecing, the other end of varistor is connected with 2 feet of isolated voltage transformer, 3 feet of isolated voltage transformer and voltage conversion electricity
One end of resistance, one end of voltage filter connect respectively, 4 feet of isolated voltage transformer and the other end of voltage transfer resistance,
The other end of voltage filter connects respectively.
Multifunction electric fire monitoring system the most according to claim 6, it is characterised in that described each phase
It is galvanically isolated module and all includes isolating current transformer, voltage transfer resistance and phase current wave filter, and isolation current transformer
1 foot and 2 feet is connected with outside A phase current input, 3 feet of isolation current transformer and one end of voltage transfer resistance, electric mutually
One end of stream wave filter connects respectively, 4 feet of isolation current transformer and the other end of voltage transfer resistance, phase current wave filter
The other end connect respectively.
Multifunction electric fire monitoring system the most according to claim 5, it is characterised in that described neutral line current
Isolation module includes isolating current transformer, voltage transfer resistance and neutral line current wave filter, 1 foot of isolation current transformer and
2 feet are connected with outside neutral line current input, 3 feet of isolation current transformer and one end of voltage transfer resistance, neutral line current filter
One end of ripple device connects respectively, 4 feet of described isolation current transformer and the other end of voltage transfer resistance, neutral line current filtering
The other end of device connects respectively.
10. according to the Multifunction electric fire monitoring system one of claim 1 ~ 4 Suo Shu, it is characterised in that described phase
The computation chip that line service data acquisition module and neutral line current acquisition module all use dedicated version to be IDT90E36.
11. according to the Multifunction electric fire monitoring system one of claim 1 ~ 4 Suo Shu, it is characterised in that described phase
The exportable phase line current of line service data acquisition module, phase line harmonics, phase line first-harmonic, three-phase imbalance, voltage, power, electric energy
With residual current value.
12. according to the Multifunction electric fire monitoring system one of claim 1 ~ 4 Suo Shu, it is characterised in that described zero
The exportable neutral line current of line current acquisition module, zero line harmonic current and zero line fundamental current value.
13. according to the Multifunction electric fire monitoring system one of claim 1 ~ 4 Suo Shu, it is characterised in that described phase
The frequency reference benchmark of line service data acquisition module is corresponding phase voltage；The frequency reference of described neutral line current acquisition module
Benchmark is A/B/C three-phase voltage, and presses ABC order, with the most front effectively as reference；If A/B/C three-phase voltage all lacks,
Then phase line service data acquisition module and neutral line current acquisition module all use the standard reference frequency of 50Hz.
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| CN110244118A (en) * | 2019-06-21 | 2019-09-17 | 和远智能科技股份有限公司 | A kind of multifunction electric meter |
| CN111007436A (en) * | 2019-12-27 | 2020-04-14 | 广东电科院能源技术有限责任公司 | Electric leakage detection device |
| CN110992636A (en) * | 2019-12-29 | 2020-04-10 | 杭州拓深科技有限公司 | Electrical fire early warning method |
| CN110992636B (en) * | 2019-12-29 | 2021-09-28 | 杭州拓深科技有限公司 | Electrical fire early warning method |
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