CN107388588A - One kind fire prevention electric heater and control method - Google Patents
One kind fire prevention electric heater and control method Download PDFInfo
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- CN107388588A CN107388588A CN201610326528.7A CN201610326528A CN107388588A CN 107388588 A CN107388588 A CN 107388588A CN 201610326528 A CN201610326528 A CN 201610326528A CN 107388588 A CN107388588 A CN 107388588A
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- electric heater
- arc
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
Abstract
The invention discloses one kind fire prevention electric heater and control method, including electric arc detecting device, for detecting the arc signal on fire in electric heater, described electric arc detecting device and the control module of electric heater connect, control module receives the arc signal on fire that electric arc detecting device is sent, then disconnects the relay of electric heater.Fire prevention electric heater of the present invention solves the problems, such as that electric heater can not prevent water heater fires in advance, described fire prevention water heater is analyzed and processed by detecting the arc signal of electric heater, when judging the arc signal on fire with ability on fire, the relay of electric heater is disconnected immediately, preventive effect in advance is served, and improves the safe to use of electric heater.
Description
Technical field
The present invention relates to field of water heaters, especially a kind of fire prevention electric heater and control method.
Background technology
With the continuous development of society, many families are mounted with domestic, electric water heater.Electric heater is big by heating power
I is divided into storage-type (also known as positive displacement or heat storage type), three kinds of Instant heating type, fast heating type (also known as half storage-type)；
Storage-type is the principal mode of electric heater, by the difference of mounting means, can further discriminate between for vertical, horizontal type,
Console mode, groove following formula, and the integrated form with bathroom cabinet Integral design of newest listing.By pressure-bearing whether, again may be used
Divide into open type (plain type) and closed (pressure-bearing type).But electric heater is that safety occurs in household electrical appliance
One of most product of accident, China can all occur a lot of electric heaters and hurt sb.'s feelings event every year；Therefore, electric heater
Fire-proof function it is essential.
Such as application number：201220477808.5 " electric heaters ", the disclosure of the invention are a kind of with fire-proof function
Electric heater, including the temperature sensor being arranged in electric heater electric apparatus room, for detecting information on fire；Relay
Device, it is arranged in the current supply circuit of heating tube；Main control unit, it is connected respectively with the temperature sensor and relay,
For the control relay disconnection when receiving the information on fire of temperature sensor detection.
Because foregoing invention is merely able to detect because electric current produces substantial amounts of heat on wire and electrical component
Situation, wherein the exothermic reaction process is slow, so after can be by temperature sensor detection temperature change information
Make fire prevention measure in time.
But foregoing invention can not detect electric heater because arc discharge occurs for interconnector, electronic device
Function, described arc discharge is fast, be not easy detection and the nonmetallic materials for the surrounding that can rapidly ignite and electricity occurs
Water heater fires' accident, therefore timely fire prevention measure can not be made by temperature sensor detection temperature information.
In view of this, it is special to propose the present invention.
The content of the invention
The technical problem to be solved in the present invention is overcome the deficiencies in the prior art, there is provided one kind fire prevention electric heater and
Control method, the running parameter of electric heater is detected using sensor and electric arc detecting device, can be fully and effectively
Prevent electric heater abnormal work from triggering fire.
In order to realize the purpose, according to an aspect of the present invention, the present invention adopts the following technical scheme that：One kind is anti-
Thermoelectricity water heater, including electric arc detecting device, for detecting the arc signal on fire in electric heater, described electricity
Arc detection means and the control module of electric heater connect, control module receive electric arc detecting device send it is on fire
Arc signal, then disconnect the relay of electric heater.
Further, described electric arc detecting device is arranged in electric heater at least one load circuit, and is examined
The arc signal on fire surveyed on the load circuit；
And/or described electric arc detecting device is arranged at least one load unit in electric heater, and detect described negative
Arc signal on fire on carrier unit.
Further, described electric arc detecting device includes signal processing module and arc-detection module；
Wherein, the arc-detection module is used for the electric arc letter for detecting electric heater load circuit, and/or load unit
Number, and be connected with described signal processing module；
The signal processing module is used to receiving and handling the arc information that arc-detection module is detected, and draws on fire
Arc signal.
Further, described arc-detection module includes the first signal detection module and secondary signal detection module,
It is connected respectively with signal processing module；
Wherein, the first described signal detection module, for obtaining the zero crossing of load circuit, and/or load unit
Information；
Secondary signal detection module, for detecting the arc signal of load circuit, and/or load unit；
Described electric arc processing module obtains the detection information of the first signal detection module and secondary signal detection module,
Draw the arc signal on fire of load circuit.
Further, described fire prevention electric heater also includes temperature-detecting device, warm in electric heater for detecting
Abnormal signal is spent, described temperature-detecting device is connected with control module, and the control module receives described temperature
The temperature anomaly signal that signal processing module is sent is spent, then disconnects the relay of electric heater.
Further, described temperature-detecting device includes temperature sensor and processes temperature signal module, described
Temperature sensor is connected with processes temperature signal module, and processes temperature signal module is connected with control module；
Wherein, the temperature signal in described temperature sensor detection electric heater；
Described processes temperature signal module receives the temperature signal of temperature sensor detection, draws temperature anomaly signal.
Further, described temperature sensor be arranged at electric heater electric apparatus room, interconnector, ultra-temp controller,
One kind or its any combination in control module and power-line plug.
In order to realize the second goal of the invention of the invention, the present invention adopts the following technical scheme that：A kind of control method, institute
The control method stated comprises the following steps：
S1, start electric heater；
S2, start electric arc detecting device, and detect the arc information in electric heater in real time；
S3, control module judge whether to receive arc signal on fire, if it is not, then continuing executing with step S2；Such as
Fruit is then to perform step S4；
S4, control module disconnect relay and alarmed.
Further, step A is also included between step S2 and S3)：Start-up temperature detection means, and monitor in real time
Temperature information in electric heater.
Further, step B is also included between step S3 and step S4)：Control module judges
It is no to receive temperature anomaly signal, if it is not, then performing step A)；If it is, perform step S4.
After adopting the above technical scheme, the present invention has the advantages that compared with prior art：
1st, fire prevention electric heater of the present invention, which solves electric heater, can not prevent asking for water heater fires in advance
Topic, heretofore described fire prevention water heater are analyzed and processed by the preinstalled circuit parameter detected on load circuit,
When judging to occur the arc signal on fire with ability on fire, the relay of electric heater is disconnected immediately, serves and carries
Preceding preventive effect, and improve the safe to use of electric heater.
2nd, the structure of fire prevention electric heater of the present invention is simple, and the electric arc inspection set in the electric heater
It is simple to survey device, accuracy of detection is high, improves the fire resistance property of fire prevention water heater.
3rd, fire prevention electric heater of the present invention passes through equal in each component of electric heater and the line position that is electrically connected
The setting temperature sensor of weighing apparatus, the detection of trip temperature is entered to each position, realize the temperature comprehensive to electric heater
Degree monitoring, improves electric heater fireproof accuracy, ensure that the safe to use of electric heater.
Brief description of the drawings
The structure chart of fire prevention water heater in Fig. 1, the embodiment of the present invention；
The structure chart of fire prevention water heater in Fig. 2, another embodiment of the present invention
The abnormal arc current waveform figure of fire prevention water heater in Fig. 3, the embodiment of the present invention；
The flow chart of control method in Fig. 4, the embodiment of the present invention；
Wherein：1st, inner bag, 2, heater, 3, outlet pipe, 4, water inlet pipe, 5, temperature sensor, 6,
Control module, 7, electric arc detecting device.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings and specifically
The present invention is further detailed explanation for embodiment.
Embodiment one
As shown in Fig. 1 and figure, a kind of fire prevention electric heater of the present invention, including electric arc detecting device 7, for detecting electricity
Arc signal on fire in water heater, described electric arc detecting device 7 are connected with the control module 6 of electric heater,
Control module 6 receives the arc signal on fire that electric arc detecting device 7 is sent, then disconnects the relay of electric heater.
Wherein, the fire prevention electric heater includes inner bag 1, heater 2, outlet pipe 3, water inlet pipe 4 and control
Module 6, and heater 2, outlet pipe 3, water inlet pipe 4 are arranged in inner bag 1, described heater 2
Also it is connected with control module 6.
Fire prevention electric heater described in the present embodiment as a high power household electrical appliance, wherein, due to electronics device
Electric arc caused by inside and the outside electric arc imported cause to be discharged in electric heater on part, interconnector,
And the nonmetallic materials for surrounding of igniting.
Specifically, the insulating barrier in electrical wiring inside electric heater in the present embodiment wears, in electrical wiring
Between form pressure difference, and produce electric arc；And the load unit junction in electric heater due to loose contact produces
Arc phenomenon.
For example, the fire prevention electric heater in the present embodiment can carry out accurate control by control module 6 to temperature,
When the water temperature and water of inner container of electric water heater 1, wherein the water temperature in detection water heater liner 1, is prevented due to interior
Water in courage 1 is burnt the regulation for causing water temperature in burning for inner bag 1, and inner bag 1, and wherein control module 6 is logical
Cross and be connected with temperature controller, and be controlled by temperature controller, wherein the structure of the temperature controller includes body, moved
Contact, electrical connector, temperature-sensitive bimetal leaf, push rod.Both movable contact spring is suppressed with electrical connector and contacted, during use
It is serially connected in electric power loop.Push rod is arranged between temperature-sensitive bimetal leaf and movable contact spring.In use, temperature-sensitive is double
Sheet metal is posted in heating surface, as inner container of electric water heater 1 wall on.After the water in inner bag 1 is dryouied,
Wall surface temperature in inner bag 1 will be raised constantly, cause temperature-sensitive bimetal leaf to act, now temperature-sensitive bimetal leaf will push away
Dynamic push rod motion.Because push rod is clamped between temperature-sensitive bimetal leaf and movable contact spring, temperature-sensitive bimetal leaf is heated to be stuck up
Power caused by change is more than the elastic force of movable contact spring, and result is to open movable contact spring top, it is separated with electrical connector, so as to
Cut off the electricity supply loop, electric heater power-off is stopped heating, reach temperature controlled purpose.Its shortcoming is to work as electricity
After heater power-off, the wall surface temperature of inner bag 1 reduces, and makes temperature-sensitive bimetal leaf restoring action, push rod is in movable contact spring
Also resetted therewith in the presence of elastic force, movable contact spring is contacted with electrical connector, electric power loop conducting, cause electrical heating
Device heating power again, so moves in circles, and will cause electric water heater ceaselessly break-make under anhydrous conditions,
This not only reduces the contact life between movable contact spring and the contact of electrical connector, and the time one is grown, and will cause the damage of contact
It is bad, and produce electric arc often along with gas discharge during contacting and/or breaking current and cause electricity
Phenomena such as water heater fires.
Further, described electric arc detecting device 7 is arranged in electric heater at least one load circuit, and
Detect the arc signal on fire on the load circuit；
And/or described electric arc detecting device 7 is arranged at least one load unit in electric heater, and described in detection
Arc signal on fire on load unit.
Further, described electric arc detecting device 7 includes signal processing module and arc-detection module；
Wherein, the arc-detection module is used for the electric arc letter for detecting electric heater load circuit, and/or load unit
Number, and be connected with described signal processing module；
The signal processing module is used to receiving and handling the arc information that arc-detection module is detected, and draws on fire
Arc signal.
Specifically, the electric arc detecting device 7 described in the present embodiment is arranged on the main load circuit of electric heater,
Described electric heater is connected by main load circuit with each load unit in water heater, and provides voltage for it.
Therefore electric hot water can effectively be monitored by setting electric arc detecting device 7 on main load circuit in the present embodiment
Arc signal in device in each load circuit, each load unit；Specifically, in the electric heater each load circuit,
When electric arc is produced in each load unit, it is abnormal to be able to detect that interlock circuit parameter occurs on main load circuit.
Further, described arc-detection module includes the first signal detection module and secondary signal detection module,
It is connected respectively with signal processing module；
Wherein, the first described signal detection module, for obtaining the zero crossing of load circuit, and/or load unit
Information；
Secondary signal detection module, for detecting the arc signal of load circuit, and/or load unit；
Described electric arc processing module obtains the detection information of the first signal detection module and secondary signal detection module,
Draw the arc signal on fire of load circuit.
Specifically, the first described signal detection module is arranged on main load circuit, and for detecting electric arc letter
Number；Secondary signal detection module is arranged on main load circuit, and for detecting the letter of the zero crossing in load circuit
Breath.The detection information of described arc signal and the zero-crossing examination information of described circuit are sent to signal transacting mould
Block, and by signal processing module processing detection signal and draw arc signal on fire.
As shown in figure 3, handling detected arc signal by signal processing module, and arc current waveform figure is drawn,
And judged to draw arc signal on fire by arc current waveform map analysis；Wherein, when electric heater works, electric arc
The normal condition of current waveform is sine wave, when electric heater breaks down it sometimes appear that it is single it is improper just
String ripple, but the duration is shorter, for example, during electric heater starting state, can also cause similar failure once in a while
Electric arc, but the duration is shorter；But during electric heater generation electric arc on fire, arc current waveform continues
Improper sine wave, wherein the continuous occurrence number of improper sine wave be more than 2, then draw arc signal on fire, and
Arc signal on fire is sent to the control module 6 of electric heater, and the relay of electric heater is disconnected by control module 6
Device.
Specifically, the first described signal detection module includes detection ring and the detection that detection is arranged on load circuit
Circuit, described detection ring are connected with detection circuit, and described load circuit is arranged in detection ring, can be abundant
Arc signal in inductive load loop.Wherein, described detection ring is electromagnetic detection ring.
Described secondary signal detection module respectively with the live wire in load circuit and corresponding zero line (or ground wire)
Connection, and parallel resistance R1 and electric capacity C, for detecting the zero crossing information of load circuit.
In summary, the fire prevention electric water heater described in the present embodiment has the advantage that：
1st, the fire prevention electric heater described in the present embodiment, which solves electric heater, can not prevent asking for water heater fires in advance
Topic, the fire prevention water heater described in the present embodiment are carried out at analysis by the preinstalled circuit parameter detected on load circuit
Reason, when judging to occur the arc signal on fire with ability on fire, the relay of electric heater is disconnected immediately, is played
Preventive effect in advance, and improve the safe to use of electric heater.
2nd, the structure electric arc that is simple, and being set in the electric heater of the fire prevention electric heater described in the present embodiment
Detection means 7 is simple, and accuracy of detection is high, improves the fire resistance property of fire prevention water heater.
Embodiment two
As shown in figure 1, the fire prevention electric heater described in the present embodiment also includes temperature-detecting device, for detecting
Temperature anomaly signal in electric heater, described temperature-detecting device are connected with control module 6, the control module 6
The temperature anomaly signal that described processes temperature signal module is sent is received, then disconnects the relay of electric heater.
Further, described temperature-detecting device includes temperature sensor 5 and processes temperature signal module, described
Temperature sensor 5 be connected with processes temperature signal module, processes temperature signal module is connected with control module 6；
Wherein, described temperature sensor 5 detects the temperature signal in electric heater；
Described processes temperature signal module receives the temperature signal of temperature sensor detection, draws temperature anomaly signal
And temperature anomaly signal is sent to control module 6.
When described Temperature Treatment module judges that the temperature for receiving institute's test position exceedes corresponding preset temperature value, then
Temperature anomaly signal is drawn by processes temperature signal module；If the temperature of institute's test position is received not less than corresponding
During preset temperature value, then processes temperature signal module draws temperature normal signal.
Further, described temperature sensor 5 is arranged at electric heater electric apparatus room, interconnector, overtemperature temperature control
Device, control module 6 and one kind or its any combination in power-line plug.
Or described temperature sensor 5 be arranged at electric heater electric apparatus room, interconnector, overtemperature temperature control system,
Any position in control module 6 and power-line plug, because temperature is inconsistent in water heater, then correspond to different
Position sets different preset temperature values, and the position that temperature sensor 5 is set and corresponding preset temperature value
In storage and processes temperature signal module, when corresponding temperature sensor 5 exceedes preset value, then to control module 6
Temperature anomaly signal is sent, and relay is disconnected by control module 6.
Or it is additionally provided with Smoke Sensor, light sensor and air-sensitive in the fire prevention water heater described in the present embodiment
A kind of or its any combination in sensor, and described Smoke Sensor, light sensor and gas sensor
Connected with corresponding signal processing module, and the control module 6 of corresponding signal processing module and electric heater connects
Connect, received when control module 6 corresponding to the abnormal signal that sends of signal processing module, then disconnect relay.
In summary, the fire prevention electric water heater described in the present embodiment has the advantage that：
1st, the fire prevention electric heater described in the present embodiment passes through each component in electric heater and the line position that is electrically connected
Balanced setting temperature sensor 5, the detection of trip temperature is entered to each position, is realized comprehensive to electric heater
Monitoring temperature, electric heater fireproof accuracy is improved, ensure that the safe to use of electric heater.
Embodiment three
As shown in figure 4, the control method for electric heater of being prevented fires described in the present embodiment, wherein described control method
Comprise the following steps：
S1, start electric heater；
S2, start electric arc detecting device, and detect the arc information in electric heater in real time；
S3, control module 6 judge whether to receive arc signal on fire, if it is not, then continuing executing with step S2；
If it is, perform step S4；
S4, control module 6 disconnect relay and alarmed.
Further, step A is also included between step S2 and S3)：Start-up temperature detection means, and monitor in real time
Temperature information in electric heater.
Further, step B is also included between step S3 and step S4)：Control module judges
It is no to receive temperature anomaly signal, if it is not, then performing step A)；If it is, perform step S4.
Or also include step C after step S4), after disconnecting relay preset time, it is again started up arc-detection
Device 7 and temperature-detecting device, and the arc information in electric heater and temperature information are detected, judge whether to receive
To arc information on fire, and/or temperature anomaly signal, if it is, the state that guard relay is closed；If not,
Then open relay and control electric heater normal work.
In summary, the control method of the fire prevention electric heater described in the present embodiment has advantages below：
1st, described in the present embodiment fire prevention water heater control method can comprehensively to electric heater it is safe for operation enter
Row monitoring, failure judgement situation, carries out fire prevention processing, improves the stability and peace of the operation of electric heater in time
Quan Xing, user is met to requirement safe to use.
Example IV
As shown in figure 4, the control method for electric heater of being prevented fires described in the present embodiment, wherein described control method
Comprise the following steps：
S1, start electric heater；
S2, start electric arc detecting device 7, and detect the arc information in electric heater in real time；
S3, control module 6 judge whether to receive arc signal on fire, if it is not, then continuing executing with step S2；
If it is, perform step S4；
S4, control module 6 disconnect relay and alarmed.
Further, step A is also included between step S2 and S3)：Start-up temperature detection means, and monitor in real time
Temperature information in electric heater.
Further, step D is also included between step S3 and step S4)：Control module 6 is judged in electric heater
Whether temperature exceedes preset value, if it is not, then performing step A)；If it is, perform step S4.
Or also include step E between step S3 and step S4)：Control module 6 judges temperature in electric heater
Whether preset value is exceeded, if it is not, then performing step A)；If it is, again read off after prefixed time interval
The temperature information of the temperature sensor 5, and whether the temperature gap of twi-read exceedes preset difference value before and after judgement,
If it is, performing step A)；If it is not, then perform step S4.Control method described in the present embodiment,
It can avoid causing the maloperation of relay because temperature sensor 5 breaks down, further ensure that electric heater
The stability and security of operation.
Embodiment in above-described embodiment can be further combined or replace, and embodiment is only to the present invention
Preferred embodiment be described, not the spirit and scope of the present invention are defined, set not departing from the present invention
On the premise of counting thought, various change and change that professional and technical personnel in the art make to technical scheme
Enter, belong to protection scope of the present invention.
Claims (10)
1. one kind fire prevention electric heater, it is characterised in that：Including electric arc detecting device, for detecting in electric heater
Arc signal on fire, the control module of described electric arc detecting device and electric heater connects, and control module receives
The arc signal on fire sent to electric arc detecting device, then disconnect the relay of electric heater.
A kind of 2. fire prevention electric heater according to claim 1, it is characterised in that：Described arc-detection dress
Install and be placed in electric heater at least one load circuit, and detect the arc signal on fire on the load circuit；
And/or described electric arc detecting device is arranged at least one load unit in electric heater, and detect described negative
Arc signal on fire on carrier unit.
A kind of 3. fire prevention electric heater according to claim 1, it is characterised in that：Described arc-detection dress
Put including signal processing module and arc-detection module；
Wherein, the arc-detection module is used for the electric arc letter for detecting electric heater load circuit, and/or load unit
Number, and be connected with described signal processing module；
The signal processing module is used to receiving and handling the arc information that arc-detection module is detected, and draws on fire
Arc signal.
A kind of 4. fire prevention electric heater according to claim 3, it is characterised in that：Described arc-detection mould
Block includes the first signal detection module and secondary signal detection module, is connected respectively with signal processing module；
Wherein, the first described signal detection module, for obtaining the zero crossing of load circuit, and/or load unit
Information；
Secondary signal detection module, for detecting the arc signal of load circuit, and/or load unit；
Described electric arc processing module obtains the detection information of the first signal detection module and secondary signal detection module,
Draw the arc signal on fire of load circuit.
A kind of 5. fire prevention electric heater according to claim 1, it is characterised in that：Described fire prevention electric hot water
Device also includes temperature-detecting device, for detecting temperature anomaly signal in electric heater, described temperature-detecting device
It is connected with control module, the control module receives the temperature anomaly letter that described processes temperature signal module is sent
Number, then disconnect electric heater relay.
A kind of 6. fire prevention electric heater according to claim 5, it is characterised in that：Described temperature detection dress
Put and connect including temperature sensor and processes temperature signal module, described temperature sensor with processes temperature signal module
Connect, processes temperature signal module is connected with control module；
Wherein, the temperature signal in described temperature sensor detection electric heater；
Described processes temperature signal module receives the temperature signal of temperature sensor detection, draws temperature anomaly signal.
A kind of 7. fire prevention electric heater according to claim 5, it is characterised in that：Described temperature sensor
The one kind being arranged in electric heater electric apparatus room, interconnector, ultra-temp controller, control module and power-line plug
Or its any combination.
A kind of 8. control method for electric heater of being prevented fires as described in claim 1-7 is any, it is characterised in that：It is described
Control method comprise the following steps：
S1, start electric heater；
S2, start electric arc detecting device, and detect the arc information in electric heater in real time；
S3, control module judge whether to receive arc signal on fire, if it is not, then continuing executing with step S2；Such as
Fruit is then to perform step S4；
S4, control module disconnect relay and alarmed.
9. control method according to claim 8, it is characterised in that：Also include step between step S2 and S3
Rapid A)：Start-up temperature detection means, and the temperature information in electric heater is monitored in real time.
10. control method according to claim 8, it is characterised in that：Between step S3 and step S4 also
Including step B)：Control module judges temperature anomaly signal whether is received in electric heater, if it is not, then performing
Step A)；If it is, perform step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326528.7A CN107388588A (en) | 2016-05-16 | 2016-05-16 | One kind fire prevention electric heater and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326528.7A CN107388588A (en) | 2016-05-16 | 2016-05-16 | One kind fire prevention electric heater and control method |
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| CN107388588A true CN107388588A (en) | 2017-11-24 |
Family
ID=60338662
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610326528.7A Pending CN107388588A (en) | 2016-05-16 | 2016-05-16 | One kind fire prevention electric heater and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151295A (en) * | 2017-12-26 | 2018-06-12 | 苍南鑫烨电子科技有限公司 | Horizontal electric water heater |
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| US20070210067A1 (en) * | 2006-02-21 | 2007-09-13 | Patterson Wade C | Water Heating Systems and Methods for Detecting Dry Fire Conditions |
| CN201812022U (en) * | 2009-12-23 | 2011-04-27 | 北京海博智恒电气防火科技有限公司 | Monitoring device for harmful electric arc of power system |
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