CN207200260U - It is grounded abnormal protection device and protection system - Google Patents
It is grounded abnormal protection device and protection system Download PDFInfo
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- CN207200260U CN207200260U CN201720482949.9U CN201720482949U CN207200260U CN 207200260 U CN207200260 U CN 207200260U CN 201720482949 U CN201720482949 U CN 201720482949U CN 207200260 U CN207200260 U CN 207200260U
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Abstract
The utility model discloses a kind of protection device for being grounded exception and protection system, protection device includes being used for the threshold voltage detection module and alarm module for detecting " ground wire " voltage, alarm module is connected on threshold voltage detection module, the control alarm module work of threshold voltage detection module, 220V electric mains are to power supply for electrical equipment, protection device is connected between the zero line and ground wire of 220V electric mains, whether dangerous voltage thresholding is exceeded using the voltage on threshold voltage detection module detection ground wire, when the voltage that threshold voltage detection module is detected on ground wire exceedes dangerous voltage thresholding, then threshold voltage detection circuit control alarm module is alarmed.The utility model can detect that " ground wire " is unexpected powered dangerous, and can send alarm in time, but also can be protected by way of cutting off, isolate electrical appliance, to avoid personnel from getting an electric shock, ensure safety.
Description
Technical field
The utility model discloses a kind of circuit protection device, the abnormal protection device of particularly a kind of household electricity ground wire
And protection system, while there is the device of the early warning of ground wire abnormality detection and protection, belong to circuit protection technical field.
Background technology
People have invented generator before 100 years, and from that time, electricity is just widely applied in people live, and is turned into
An indispensable part, the production and living to people bring great convenience in people's life, but also bring simultaneously many negative
Face rings, and every year, the news of someone's " being electrocuted " is reported in media repeatedly and website, several sections of extracts are as follows：
First, " advanced electrician is electrocuted when having a bath by electric heater.The running water that gondola water faucet gushes out during bathing is unexpectedly powered, closes
After power down lock, water heater is unexpectedly still powered.45 divide during day before yesterday evening 11, occur in Unit 504,7, the clouds garden in Baiyun District Tong He towns
Get an electric shock together dead event, electrician Lao Deng is fallen when oneself bathroom is had a bath by electric heater electricity.After the incident, Baiyun District street is handled affairs
Place, street local police station, residents' committee in community set up work coordination group, investigate as to this rapidly, specific cause of accident need into
One step is looked into.”
2nd, " maiden's bathing in 14 years old is electrocuted manufacturer and claims electric heater out of question.There are two weeks, the flower of 14 years old away from starting to school
All girl is small quick（Assumed name）But classroom can not be returned to again.13 evening of August, just having a shower at home she get an electric shock it is dead.Water heater
Producer claims detection to show that electric heater 100% has no problem.Small quick father and mother represent that electric heater manufacturer responsibility will be investigated.It is small
The quick specific cause of the death is also treated further to investigate.”
3rd, " water heater causes three people, 2 people of electric shock dead into " assailant " again.For good fortune Mrs Li of 31 years old forever, this is to tear
One day of heart shake lung：Yesterday, her husband, father is almost simultaneously dead, and she had a bath at home at that time, and gondola water faucet is powered, and she, which shies, cries out
Help, husband, which rushes in, pulls open her, and oneself but gets an electric shock and fallen down to the ground, and her father over fifty years old is seen this, and holding is gone after having drawn electric brake,
Electric shock falls down to the ground, and two people finally give treatment to invalid dead.”
Possible someone's query：" why leakage switch does not work.”；" whether electric apparatus quality is unqualified "；" it is
That installation is lack of standardization " ... really, the problem of these are obvious, may all cause accident, but so the problem of be also easy to
Found and solved by existing measure.In other words, it is such even if leakage switch is good, electric apparatus quality is qualified, installation specification etc.
Tragedy can not still avoid, and have advanced electrician from foregoing case description, and also have and drawn electric brake still just to be understood by electricity,
Certainly the reason for rarely known by the people exists.Trace it to its cause in fact very simple, exactly " be grounded " abnormal powered.According to China
Present power system is set, and " ground wire " should be not charged, should shield, when the abnormal conditions such as electric leakage occur,
" ground wire " can be conducted into the earth, so as to play a part of leakage protection, nowadays instead because " ground wire " is powered and becomes
The arch-criminal of electric people, it is unavoidable unexpected, therefore the reason little known is not also just strange.
Obviously, once " ground wire " is powered, then the grounding shell of all electrical equipment is all powered, even if drawing electric brake same
It is powered, because civil power electric brake home-use at present（Switch）Only cut-out live wire（Some goes back line off zero simultaneously）, ground connection will not be cut off
Line.How that " ground wire " takes electricity.May be it will be said that " it is upper that live wire takes ground wire "；" electrical leakage "
Etc., these failures certainly also can, but these can substantially cause trip and be excluded quickly.
Household electricity in the present power system in China has 3 wires：Live wire, zero line and ground wire, analyze basic fault
Pattern has two kinds of short circuit and open circuit：
Under short-circuit mode, live wire and zero short-circuit between conductors, it can cause to be spaced apart tripping operation or blown fuse；Between live wire and ground wire
Short circuit, electric leakage switch tripping or blown fuse can be caused；Zero line and the ground connection temporary non-hazardous of short-circuit between conductors；Live wire, zero line and connect
Ground short-circuit between conductors, electric leakage switch tripping can be caused or be spaced apart tripping operation or blown fuse, that is, existing measure can be protected in time
Shield, find and overhaul harm caused by short circuit；
Under open circuit mode, live wire open circuit, zero line break, live wire and zero line break, live wire and ground wire open circuit, zero line and connect
Ground wire open circuit, live wire and zero line and ground wire open circuit, can cause electrical appliance to work, and can find in time and reparing.
When only ground wire is individually breaking, electrical appliance still can work, and existing measure can not also be found in time and reparing, exists hidden
Suffer from.
A simple experiment is done, if " ground wire " in home-use civil power is disconnected, is divided into family and outside family two
Section, now measuring this section hanging " ground wire " in family can find to be substantially powered, and voltage is about on a 110V left sides
The right side, because Switching Power Supply is much all employ in household appliances, wherein there is Y capacitance（Electromagnetic compatibility acts on）Or similar dress
Put, so may result in has small leakage current between live wire and " ground wire "（This is also not enough to trigger leakage switch）.Normally
In the case of, " ground wire " ground connection is good, and leakage current will enter the earth, be no voltage on " ground wire "；And once, " connect
Ground wire " is hanging or imperfect earth, this 110V non-security voltage can just reveal.And this leakage current then can be with
Electrical appliance quantity increase and increase, it will be apparent that, in a building electricity consumption of multiple families be connected in parallel, this " normal "
Drain conditions be cumulative, it is easy to just reach human body deadly current, especially now each leakage switch can't act.
In other words, lie dormant possible fatal leakage current voltage always under normal operation, on " ground wire ".One
Denier, " ground wire " is hanging or imperfect earth, this potential danger release out the grounding shell by all electrical appliances
Come, harm face is very wide, and the especially wet electrical equipment of this belt transect torrent of water heater more easily meets accident, so must assure that " ground wire "
At every moment all being grounded well could really ensure safety.For this problem, possible someone says in which can not consider worth doing " ensures that ground connection is good
It is good not just ", so answer is the seriousness for not recognizing this problem also.Ground connection was obvious when installation is checked and accepted
It is specification and good, but at every moment all ground connection is well in use after can guarantee that.This is to be worth query.Use process
In accident it is always unavoidable, such as " live wire take ground wire upper "；It is unexpected as " electrical leakage ", can be existing
The safeguard measures such as leakage switch, insurance, air switch are found in time and protection disconnects, and are overhauled in time, avoid fault spread, but
" ground wire " unexpectedly disengage or imperfect earth, such as get rusty, mouse stings, by mistake construction etc., " ground wire " is powered, and family is each
Individual electrical equipment still can work in the same old way, existing safeguard measure but can not find and protect in time, only just be known not just by electricity
Often, and uncertain know it is that " ground wire " is abnormal.Exactly such potential danger, it is not easy to be found and protected in time,
And cause human life accident.It can be seen that foregoing the root of the accident is：" ground wire " the upper moment of household electricity lies dormant dangerous electric
Pressure, it is unexpected powered if " ground wire " is bad, and system can not detect early warning and protection in time at present, be system it is interior consolidate
There is hidden danger.
The content of the invention
It can not be detected for " ground wire " of the prior art open circuit mentioned above, unexpected disengagement or imperfect earth,
The shortcomings that potential safety hazard be present, the utility model provides a kind of protection device for being grounded exception and protection system, and it can be detected
" ground wire " is unexpected powered dangerous.
The utility model solves the technical scheme that its technical problem uses：It is a kind of to be grounded abnormal protection device, protect
Protection unit is connected to thresholding including the threshold voltage detection module for being used to detect " ground wire " voltage and alarm module, alarm module
In voltage detection module, the control alarm module work of threshold voltage detection module.
A kind of abnormal protection system of ground wire, protection device of the protection system including ground wire exception described above,
220V electric mains and electrical equipment, for 220V electric mains to power supply for electrical equipment, protection device is connected to 220V electric mains
Zero line and ground wire between.
The technical scheme that the utility model solves the use of its technical problem further comprises：
Described alarm module is the combination of one or both of audible alarm unit or light emission alarm device.
Described protection device also includes switch module and switching value output module, switching value output module are connected to thresholding
In voltage detection module, the work of threshold voltage detection module controlling switch amount output module, module and output switch parameter mould are switched
Block connects, the work of switching value output module controlling switch module.
Described switch module uses triple-pole switch.
Described protection device also includes input interface and output interface, input interface and output interface respectively with switching molding
Group connection.
Switch module is serially connected between described 220V electric mains and electrical equipment, is connected on threshold voltage detection module
There is switching value output module, switching value output module is connected with switch module.
The beneficial effects of the utility model are：The utility model can detect that " ground wire " is unexpected powered dangerous,
And alarm can be sent in time, but also can be protected by way of cutting off, isolate electrical appliance, to avoid personnel from getting an electric shock, protect
Card safety.
The utility model is described further below in conjunction with the drawings and specific embodiments.
Brief description of the drawings
Fig. 1 is the wiring topology schematic diagram of conventional household electricity.
Fig. 2 is conventional household internal " ground wire " bad schematic diagram.
Fig. 3 is public " ground wire " bad schematic diagram.
Fig. 4 is " ground wire " bad drain voltage local detail schematic diagram.
Fig. 5 is the schematic block diagram of the protection device in the utility model.
Fig. 6 is the full-automatic protection schematic diagram of the protection device in the utility model.
Fig. 7 is the semi-automatic form schematic diagram of the protection device in the utility model.
Fig. 8 is the simplest example principles schematic diagram of the protection device in the utility model.
Fig. 9 is the outer abnormal voltage schematic diagram of protection device guard system in the utility model.
In figure, the pole input interfaces of 1- tri-, 2- threshold voltage detection modules, 3- alarm modules, 4- output switch parameter modules, 5-
Triple-pole switch, the pole output interfaces of 6- tri-, 7-220V alternating currents, the protected electrical equipments of 8-.
Embodiment
The present embodiment is the utility model preferred embodiment, and other all its principle and basic structure are identical with the present embodiment
Or it is approximate, within scope of protection of the utility model.
Protection device in the utility model mainly includes threshold voltage detection module 2 and alarm module 3, threshold voltage inspection
Module 2 to be surveyed to be used to detect the voltage difference of " ground wire " between zero line, alarm module 3 is connected on threshold voltage detection module 2,
Threshold voltage detection module 2 controls alarm module 3 to work, when threshold voltage detection module 2 detect " ground wire " and zero line it
Between voltage difference occur it is abnormal when, then control alarm module 3 send alarm, to avoid causing danger.In the present embodiment, thresholding electricity
The device or circuit for pressing detection module 2 to use neon bulb, gas-discharge tube etc. that there is threshold voltage detection function.The present embodiment
In, alarm module 3 can use the combination of one or both of audible alarm unit or light emission alarm device, audible alarm unit
Buzzer, loudspeaker etc. can be used, light emission alarm device can use neon bulb, LED etc..
In the present embodiment, protection device also includes switch module and switching value output module 4, switching value output module 4 connect
It is connected on threshold voltage detection module 2, the controlling switch amount output module 4 of threshold voltage detection module 2 works, and switch module is with opening
Pass amount output module 4 connects, the work of the controlling switch module of switching value output module 4, and in the present embodiment, switch module uses three poles
Switch 5, i.e., one switch can control three-line simultaneously, and triple-pole switch 5 is also referred to as three linked switches or three-pole gang operated switch, and three
The three-line of pole switch 5 controls live wire, zero line and " ground wire " respectively, i.e., outdoor access electric wire will be after triple-pole switch 5
It is being respectively connected to indoor power supply for electrical equipment.When it is implemented, triple-pole switch 5 can also use three single control switches or
Using one or more double control switches, or single control switch and double control switch combining form are used, but final combined effect
It is three linkages.It is of course also possible to other two of that on-off ratio for designing connection ground wire disconnects and earlier closed a little later
On, just as the ground wire ultimate ratio other 2 of three-electrode power plug extremely grows the hot plugging effect of a bit.In the present embodiment, switching molding
Group can use the relay of electronic controllable, be spaced apart, the mechanical switch for having physical isolation to act on such as leakage switch.In the present embodiment
Three-pole gang operated switch 5 be 3 and switch the linked switch that must open and close together, usually in normally off.
In the present embodiment, protection device also includes input interface and output interface, input interface and output interface respectively with
Module is switched to connect, in the present embodiment, input interface uses three pole input interfaces 1, and output interface uses three pole output interfaces 6,
The mains supply i.e. live wire of 220V alternating currents 7, zero line, ground wire is connected to by three pole input interfaces 1,3 lines pass through three poles
After linked switch 5, it is connected on three pole output interfaces 6, then reconnects protected electrical equipment 8.
Protection system in the utility model is to be connected to the threshold voltage detection module 2 in protection device described above
Between the ground wire and zero line of electric main.Live wire, zero line and ground wire in electric main are connected with switch module respectively, are led to
Switch module is crossed to power to protected electrical equipment 8.
In use, once " being grounded ", exception is powered to exceed dangerous voltage thresholding, then trigger action, carries out audible and visual alarm,
And control three-pole gang operated switch to disconnect, keep apart protected electrical equipment and dangerous matter sources, avoiding getting an electric shock ensures safety.
Operation principle of the present utility model is as follows：
It refer to accompanying drawing 1, in the civilian electric electric power system in China, in general household electricity has 3 wires：Live wire, zero line and
It is grounded, is to be connected in parallel between each electrical equipment in family, the shell of each electrical equipment passes through ground wire and the earth
Connection, if ground connection is good, even if with the presence of the leakage current of Y capacitance, shell is still safe zero potential.
When the registering one's residence of certain family " ground wire " is bad, that is, break down, refer to accompanying drawing 2, each electricity consumption in family
The leakage current of the Y capacitance of equipment can not be released by ground wire, then " be grounded "（Then electrical appliance shell）On will appear from about
110V dangerous voltages, its possible current value are that the leakage current of all electrical appliances of the household internal adds up.
If when public " ground wire " of multiple families such as building, unit, cell is bad, accompanying drawing 3, building refer to
, the leakage current of Y capacitance in unit, cell in the electrical equipment of all families can not all be released by ground wire, then " ground connection
Line "（Then electrical appliance shell）On will appear from about 110V dangerous voltages, its possible current value is all electrical appliances of multiple families
Leakage current add up.
Accompanying drawing 4 is refer to, is that the local detail for being grounded failure is shown in Fig. 4, when " ground wire " is bad, Y capacitance
Leakage current can not be released by ground wire, then " be grounded "（Then electrical appliance shell）On will appear from dangerous voltage, its is equivalent
Evaluation is VG=（VL-VZ）*Cy/（Cy+Cy）, for 220V alternating current system, 110V may be approximately equal to.
Using guard method of the present utility model, i.e., application method of the present utility model, accompanying drawing 5 is refer to, in electrical appliance
The protection device sealed between AC power in this utility model, wherein, three pole input interfaces 1 and three pole output interfaces 6
Only it is wiring effect, three-pole gang operated switch 5 is in normally off, does not influence electrical appliance work, in protection dress of the present utility model
Inside is put, threshold voltage detection circuit 2 is connected between zero line and ground wire, for detecting whether the voltage on ground wire exceedes
Dangerous voltage thresholding, when abnormal powered on " ground wire ", i.e., when the voltage on ground wire exceedes dangerous voltage thresholding, then door
Voltage limit detection circuit 2 acts, and control alarm module 3 is luminous and sounding is alarmed.Meanwhile pass through switching value output module 4
Control three lines of three-pole gang operated switch 5 all off so that protected electrical equipment 8 and dangerous matter sources are kept apart, and are avoided
Get an electric shock and ensure safety.Because being linked in the utility model using three poles, it is that the attaching plug of electrical appliance is pulled up to just look like
Come the same（In the absence of being separately provided switch on ground wire）.After " ground wire " recovers normal not charged, three-pole gang operated switch 5 can
Selection manual reset automatically resets（When three-pole gang operated switch 5 is using automatic reset switch, it can be automatically reset,
When three-pole gang operated switch 5 is switched using Non auto-reset, it can carry out manual reset）.Although detect " ground wire " constantly
On abnormal voltage, because only that abnormal voltage be present and more than after dangerous thresholding in " ground wire ", just triggering work, and using
Be abnormal voltage electricity, so the utility model usually not power consumption！
It refer to accompanying drawing 9, the abnormal voltage in the utility model on so-called " ground wire ", except the hidden danger of internal system
（Leakage current manifests dangerous voltage due to imperfect earth）Outside, it is also possible to because the abnormal conditions outside system cause, than
Such as high-voltage line senses, touches, makes contact, is struck by lightning, the equally detectable dangerous voltage of the utility model, and alarm protection in time.
Accompanying drawing 6 is refer to, this is the preferred embodiment of the protection device in the utility model, can be referred to as full-automatic
Protected mode, protection device include three pole input interfaces 1, threshold voltage detection module 2, alarm module 3, switching value output module
4th, the pole output interface 6 of triple-pole switch 5 and three, three pole input interfaces 1 are connected to the mains supply i.e. live wire of 220V alternating currents 7, zero
Line, ground wire, 220V alternating currents 7 are inputted to triple-pole switch 5, three pole output interfaces 6 by 3 lines and are connected to triple-pole switch 5
On, it is connected to zero line and ground connection to protected electrical equipment 8, threshold voltage detection module 2 for 220V alternating currents 7 to be exported
Between line, alarm module 3 and switching value output module 4 are connected with threshold voltage detection module 2 respectively, switching value output module 4
Output control signal works to triple-pole switch 5, control triple-pole switch 5.When " ground wire " is bad and powered, when its electrified voltage surpasses
When crossing dangerous thresholding, the utility model output sound and light hazard, and whole connections of electrical appliance and power supply are automatically cut off, every
From dangerous matter sources, to ensure safety.
Accompanying drawing 7 is refer to, the present embodiment is simplified embodiment of the present utility model, can be referred to as semi-automatic protection mould
Formula, protection device only include threshold voltage detection module 2 and alarm module 3, when threshold voltage detection module 2 detects " ground connection
Line " is bad and powered, when its electrified voltage exceedes dangerous thresholding, the utility model output sound and light hazard, carries in time
Showing user, danger, need to be manually isolated dangerous matter sources（Such as pull up attaching plug）And maintenance, to ensure safety.
Accompanying drawing 8 is refer to, the present embodiment is most simple embodiment of the present utility model, only a neon bulb and a current limliting electricity
Resistance composition, neon bulb and current-limiting resistance collectively constitute threshold voltage detection module, and neon bulb is provided simultaneously with threshold voltage detection and lighted
Two kinds of alarm acts on, and does not have sound alarm, only light hazard one kind in the present embodiment.
Hidden danger inside electric power system（Leakage current manifests dangerous voltage due to imperfect earth）, it is not to have at all times
, its tangible alternating current applies initial stage, and this hidden danger is not present, because leakage current is not present in normal electrical appliance, if
Leakage current is that electrical appliance goes wrong certainly, and it is the accident of small probability that electrical appliance, which goes wrong, even if occurring, the leakage current can also
Line is grounded to releasing, is safe from danger, unless, the imperfect earth of small probability is met now and by chance, small probability multiplies small general
The situation of rate is almost a-hundred-year, even if this a-hundred-year small small probability event simultaneously there occurs, moment of electric shock,
Existing leakage switch still can act, in time protection, because its leakage current is to exceed leakage switch in most cases
Action thresholding, this is entirely different with foregoing hidden danger.As development in science and technology and application are maked rapid progress, especially Switching Power Supply
Appearance and electromagnetic compatibility Y capacitance use（Or similar equipment and device）So that during electrical appliance normal work, exist
One small leakage current, these leakage currents are cumulative with the quantity increase of electrical appliance.Especially no matter the serious is leak electricity
How stream adds up, very big danger close, is acted all without the leakage switch allowed in system, and is existing at any time, because this is
Normal condition, that is to say, that existing leakage switch is invalid.Only at every moment system earth is good（In light own home
Ground wire is good useless, and common ground is bad also to be introduced electricity in some family, so being uncontrollable.）, leakage current has
Release approach, be just safe from danger, once ground connection is bad, this leakage current is immediately turned to dangerous voltage and revealed, together
When appear on the shell of all electrical appliances, be easiest to Danger Electric shock risk occur, thus be the moment all exist and existing system without
Method detects the uncertain hidden danger of protection in time.Therefore electric shock accidents happens occasionally, and still get an electric shock after drawing electric brake, all exist
Among rational explanation, while the seriousness of the visible hidden danger.
Although electrician oneself detects ground wire by voltage test pencil and is known that either with or without powered, this is only limited to visit
When survey, actual time safety can not be ensured completely.Such as：When someone has a bath, the common ground line in corridor is anticipated by mouse
Bite broken outside, then it is immediately bad by electricity, and without any sign, or it is good during ground wire when it is bad just more troublesome.And use this practicality new
After the protection device of type, dangerous voltage, and timely alarm prompt, or even automatism isolation can be detected at any time, avoids Danger Electric shock risk
Occur, can solve this intrinsic hidden danger of existing home-use alternating current system.
When apparatus of the present invention are realized, to full-automatic mode, three-pole gang operated switch must be that three poles are linked, equivalent to there is danger
The attaching plug of electrical appliance is pulled equally when dangerous（If not the linkage of three poles, in fact it could happen that the situation of disconnecting ground wire, phase
When having added switch the same to ground wire, this is that system does not allow）.Circuit form is unlimited, in physical form, can with it is existing
Any combination such as various plugs, socket, switch, relay are realized, detection alarm and control circuit are added, fully profit
With existing resource, can also compared with such as air switch, leakage switch etc. combine, form multifunction switch, however, it is necessary to
Pay attention to wanting three poles to link.
The utility model can detect that " ground wire " is unexpected powered dangerous, and can send alarm in time, but also
It can be protected by way of cutting off, isolate electrical appliance, to avoid personnel from getting an electric shock, ensure safety.
Claims (6)
1. a kind of be grounded abnormal protection device, it is characterized in that：Described protection device includes being used to detect " ground wire " electricity
The threshold voltage detection module and alarm module of pressure, alarm module are connected on threshold voltage detection module, threshold voltage detection
Module control alarm module work, described protection device also include switch module and switching value output module, output switch parameter
Module is connected on threshold voltage detection module, the work of threshold voltage detection module controlling switch amount output module, switchs module
It is connected with switching value output module, the work of switching value output module controlling switch module.
2. the abnormal protection device of ground wire according to claim 1, it is characterized in that：Described alarm module is sound report
The combination of one or both of alarm device or light emission alarm device.
3. the abnormal protection device of ground wire according to claim 1, it is characterized in that：Described switch module uses three poles
Linked switch.
4. the abnormal protection device of ground wire according to claim 1, it is characterized in that：Described protection device also includes defeated
Incoming interface and output interface, input interface and output interface are connected with switch module respectively.
5. a kind of be grounded abnormal protection system, it is characterized in that：Described protection system is included as appointed in Claims 1-4
Protection device, 220V electric mains and the electrical equipment of ground wire exception described in meaning one, 220V electric mains are set to electricity consumption
Available electricity, protection device are connected between the zero line and ground wire of 220V electric mains.
6. the abnormal protection system of ground wire according to claim 5, it is characterized in that：Described 220V electric mains and use
Switch module is serially connected between electric equipment, switching value output module, output switch parameter mould are connected with threshold voltage detection module
Block is connected with switch module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720482949.9U CN207200260U (en) | 2017-05-04 | 2017-05-04 | It is grounded abnormal protection device and protection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720482949.9U CN207200260U (en) | 2017-05-04 | 2017-05-04 | It is grounded abnormal protection device and protection system |
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| CN207200260U true CN207200260U (en) | 2018-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI721474B (en) * | 2019-06-28 | 2021-03-11 | 張浚維 | Neutral circuit protection equipment |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI721474B (en) * | 2019-06-28 | 2021-03-11 | 張浚維 | Neutral circuit protection equipment |
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