CN106981860A - The abnormal detection guard method of ground wire, protection device and protection system - Google Patents
The abnormal detection guard method of ground wire, protection device and protection system Download PDFInfo
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- CN106981860A CN106981860A CN201710306190.3A CN201710306190A CN106981860A CN 106981860 A CN106981860 A CN 106981860A CN 201710306190 A CN201710306190 A CN 201710306190A CN 106981860 A CN106981860 A CN 106981860A
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- Prior art keywords
- ground wire
- module
- protection device
- switch
- threshold voltage
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
Abstract
The present invention discloses a kind of abnormal detection guard method of ground wire, protection device and protection system, protection device includes the threshold voltage detection module and alarm module for being used to detect " 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 of 220V electric mains and ground wire, detect whether the voltage on ground wire exceedes dangerous voltage thresholding using threshold voltage detection module, 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 present invention can detect " ground wire " it is unexpected powered dangerous, and alarm can be sent in time, but also can be protected by way of cut-out, isolation electrical appliance, to avoid personnel from getting an electric shock, it is ensured that safely.
Description
Technical field
The present invention discloses a kind of circuit protection device, the abnormal detection protection side of particularly a kind of household electricity ground wire
Method, protection device and protection system, while having the device of the early warning of ground wire abnormality detection and protection, belong to circuit protection technology neck
Domain.
Background technology
People have invented generator before 100 years, from that time, and electricity is just widely applied in people live, and is turned into
An indispensable part in people's life, the production and living given people bring great convenience, but also bring many negative simultaneously
Face rings, and every year, the news of someone's " being electrocuted " is reported in media and website repeatedly, takes passages several sections as follows：
First, " senior electrician is electrocuted when having a bath by electric heater.The running water that gondola water faucet gushes out during bathing is unexpectedly powered, turns off electricity
After lock, water heater is unexpectedly still powered.45 points during day before yesterday evening 11, occur together in Unit 504,7, the clouds garden in Baiyun District Tong He towns
Get an electric shock dead event, electrician Lao Deng is fallen when oneself bathroom is had a bath by electric heater electricity.After the incident, Baiyun District subdistrict office,
Street local police station, residents' committee in community set up work coordination group, investigate as to this rapidly, specific cause of accident needs further
Investigation.”
2nd, " maiden's bathing in 14 years old is electrocuted manufacturer and claims electric heater out of question.There are two weeks, the Huadu female of 14 years old away from starting to school
Child 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
Detection is claimed 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 quick
The specific cause of the death also treats further investigation.”
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 heart shake
One day of lung：Yesterday, her husband, father is almost simultaneously dead, and she stayed at home bathing at that time, and gondola water faucet is powered, and she, which shies, cries for 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 sees this, and has drawn and holding is gone after electric brake, also got an electric shock
Fall down to the ground, 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
Install lack of standardization " ... really, the problem of these are obvious may all cause accident, but so the problem of be also easy to be showed
There is measure to find and solve.In other words, even if leakage switch is good, electric apparatus quality is qualified, installation specification etc., such tragedy
It can not still avoid, have senior electrician from foregoing case description, and also draw electric brake still just to be understood by electricity, certainly
Also rarely known by the people the reason for, is present.Trace it to its cause in fact very simple, be exactly that " ground wire " is abnormal powered.It is present according to China
Power system set, " ground wire " should be not charged, should shield, when occur electric leakage etc. abnormal conditions when, " ground connection
Line " can be conducted into the earth, so as to play a part of leakage protection, nowadays instead because " ground wire " is powered and becomes electric people's
Arch-criminal, 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 off live wire（What is had 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 " live wire be taken on 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 of 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 can cause air switch to trip or blown fuse；It is short between live wire and ground wire
Road, can cause electric leakage switch tripping or blown fuse；Zero line and the ground connection temporary non-hazardous of short-circuit between conductors；Live wire, zero line and ground connection
Short-circuit between conductors, can cause electric leakage switch tripping or air switch to trip or blown fuse, that is, existing measure can protect in time,
It was found that and the short-circuit harm caused of maintenance；
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 ground wire
Open circuit, live wire and zero line and ground wire open circuit, can cause electrical appliance to work, can find in time and reparing.Only
When ground wire is individually breaking, electrical appliance still can be worked, and existing measure can not also be found and reparing in time, there is hidden danger.
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 left in 110V
The right side, because much Switching Power Supply is all employ in household appliances, wherein there is Y capacitance（Electromagnetic compatibility is acted 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, and this 110V non-security voltage can just be revealed.And this leakage current then can be with
The quantity of electrical appliance increases and increased, it will be apparent that, the electricity consumption of multiple families is connected in parallel in a building, this " normal "
Drain conditions be cumulative, it is easy to just reach human body deadly current, especially now each leakage switch can't be acted.
In other words, lie dormant possible fatal leakage current voltage always under normal operation, on " ground wire ".One
Denier, " ground wire " hanging or imperfect earth, and this potential danger releases 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.It is grounded when installation was checked and accepted obvious
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 is taken on ground wire "；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, it is to avoid fault spread, but
" ground wire " is unexpectedly disengaged or imperfect earth, such as is got rusty, mouse stings, construction etc. by mistake, " 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, is difficult 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 in system 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,
There is potential safety hazard, the present invention provides a kind of abnormal detection guard method of ground wire, protection device and protection system,
It can detect that " ground wire " is unexpected powered dangerous.
The present invention solve its technical problem use technical scheme be：A kind of abnormal protection device of ground wire, protection dress
Put including the threshold voltage detection module and alarm module for detecting " ground wire " voltage, alarm module is connected to threshold voltage
On 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 described above exception,
220V electric mains and electrical equipment, 220V electric mains are to power supply for electrical equipment, and protection device is connected to 220V electric mains
Zero line and ground wire between.
A kind of abnormal guard method of ground wire of the protection device abnormal using ground wire described above, this method be
Threshold voltage detection module is connected between the zero line and ground wire of 220V electric mains, is connect using the detection of threshold voltage detection module
Whether the voltage on ground wire exceedes dangerous voltage thresholding, when the voltage that threshold voltage detection module is detected on ground wire exceedes danger
During dangerous voltage threshold, then threshold voltage detection circuit control alarm module is alarmed.
The technical scheme that the present invention 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, and switching value output module is connected to thresholding
In voltage detection module, the work of threshold voltage detection module controlling switch amount output module switchs module and output switch parameter mould
Block is connected, 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.
It is serially connected with switch module, threshold voltage detection module and connects between described 220V electric mains and electrical equipment
There is switching value output module, switching value output module is connected with switch module.
Described protection device also includes switch module and switching value output module, and switching value output module is connected to thresholding
In voltage detection module, switch module is connected with switching value output module, when threshold voltage detection module is detected on ground wire
Voltage exceed dangerous voltage thresholding when, switching value output module controlling switch module disconnect.
Input interface and output interface are connected with described switch module.
The beneficial effects of the invention are as follows：The present invention can detect " ground wire " it is unexpected powered dangerous, and can be in time
Alarm is sent, but also can be protected by way of cut-out, isolation electrical appliance, to avoid personnel from getting an electric shock, it is ensured that safety.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Brief description of the drawings
Fig. 1 is the topological schematic diagram of wiring 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 present invention.
Fig. 6 is the full-automatic protection schematic diagram of the protection device in the present invention.
Fig. 7 is the semi-automatic form schematic diagram of the protection device in the present invention.
Fig. 8 is the simplest example principles schematic diagram of the protection device in the present invention.
Fig. 9 is the outer abnormal voltage schematic diagram of protection device guard system in the present invention.
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 preferred embodiment for the present invention, and other all its principle and basic structure are identical or near with the present embodiment
As, within the scope of the present invention.
Protection device in the present invention mainly includes threshold voltage detection module 2 and alarm module 3, threshold voltage detection mould
Block 2 is used to detect the voltage difference of " ground wire " between zero line, and alarm module 3 is connected on threshold voltage detection module 2, thresholding
The control alarm module 3 of voltage detection module 2 works, when threshold voltage detection module 2 detects " ground wire " between zero line
When voltage difference occurs abnormal, then alarm module 3 is controlled to send alarm, to avoid causing danger.In the present embodiment, threshold voltage inspection
Survey device or circuit that module 2 there can be threshold voltage to detect function using neon bulb, gas-discharge tube etc..In the present embodiment, report
Alert module 3 can use the combination of one or both of audible alarm unit or light emission alarm device, and audible alarm unit can be adopted
With buzzer, loudspeaker etc., light emission alarm device can be using neon bulb, LED etc..
In the present embodiment, protection device also includes switch module and switching value output module 4, and switching value output module 4 connects
It is connected on threshold voltage detection module 2, the controlling switch amount output module 4 of threshold voltage detection module 2 works, switch module is with opening
Pass amount output module 4 is connected, 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, three
The three-line of pole switch 5 controls live wire, zero line and " ground wire " respectively, i.e. open air 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 using three single control switches or
Using one or more double control switches, or using single control switch and double control switch combining form, but finally combined effect
It is three linkages.It is of course also possible to which 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 be using the mechanical switch for having physical isolation to act on such as relay, air switch, leakage switch of electronic controllable.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
Switch in module connection, the present embodiment, input interface uses three pole input interfaces 1, 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 present invention is that the threshold voltage detection module 2 in protection device described above is connected into exchange
Between the ground wire and zero line of civil power.Live wire, zero line and ground wire in electric main are connected with switch module respectively, by opening
Module is closed to power to protected electrical equipment 8.
In use, once " ground wire " exception is powered exceedes 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, it is to avoid to get an electric shock and ensure safety.
The operation principle of the present invention is as follows：
It refer in accompanying drawing 1, the civilian electric electric power system of China, general household electricity has 3 wires：Live wire, zero line and ground connection
It is to be connected in parallel between each electrical equipment in line, family, the shell of each electrical equipment is connected by ground wire with the earth,
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, breaks down, refer to each electricity consumption in accompanying drawing 2, family
The leakage current of the Y capacitance of equipment can not be released by ground wire, then " ground wire "（Then electrical appliance shell）On will appear from about
110V dangerous voltages, its possible current value is 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, refer to accompanying drawing 3, building
, 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.
Refer in accompanying drawing 4, Fig. 4 is that the local detail of ground wire failure is shown, when " ground wire " is bad, Y capacitance
Leakage current can not be released by ground wire, then " ground wire "（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 the guard method of the present invention, i.e. application method of the invention, accompanying drawing 5 is refer to, in electrical appliance and alternating current
The protection device sealed between source in this present invention, wherein, three pole input interfaces 1 and three pole output interfaces 6 are only wiring effects,
Three-pole gang operated switch 5 is in normally off, does not influence electrical appliance to work, inside the protection device of the present invention, zero line and ground connection
Threshold voltage detection circuit 2 is connected between line, for detecting whether the voltage on ground wire exceedes dangerous voltage thresholding, once
When abnormal powered on " ground wire ", i.e., when the voltage on ground wire exceedes dangerous voltage thresholding, then threshold voltage detection circuit 2 is moved
Make, control alarm module 3 is luminous and sounding is alarmed.Meanwhile, three-pole gang operated switch 5 is controlled by switching value output module 4
Three lines it is all off so that protected electrical equipment 8 and dangerous matter sources are kept apart, it is to avoid get an electric shock ensure safety.Because
The linkage of three poles is used in the present invention, it is that the attaching plug of electrical appliance is pulled equally to just look like（In the absence of on ground wire
It is separately provided switch）.After " ground wire " recovers normal not charged, manual reset may be selected or automatic in three-pole gang operated switch 5
Reset（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 using non-
During automatic reset switch, it can carry out manual reset）.Although detecting the abnormal voltage on " ground wire " constantly, because only that
There is abnormal voltage and more than after dangerous thresholding in " ground wire ", just triggering work, and be abnormal voltage electricity, so
Usually not power consumption of the invention！
The abnormal voltage on so-called " ground wire " in accompanying drawing 9, the present invention is refer to, except the hidden danger of internal system（Leakage current
Dangerous voltage is manifested due to imperfect earth）Outside, it is also possible to because the abnormal conditions outside system cause, such as high-voltage line
Sense, touch, making contact, being struck by lightning etc., the equally detectable dangerous voltage of the present invention, and alarm protection in time.
Accompanying drawing 6 is refer to, this is the preferred embodiment of the protection device in the present invention, can be referred to as full-automatic protection
Pattern, protection device includes three pole input interfaces 1, threshold voltage detection module 2, alarm module 3, switching value output module 4, three
Pole switch 5 and three pole output interfaces 6, three pole input interfaces 1 are connected to the mains supply i.e. live wire of 220V alternating currents 7, zero line, connect
Ground wire, is inputted 220V alternating currents 7 to triple-pole switch 5 by 3 lines, three pole output interfaces 6 are connected on triple-pole switch 5, is used
Exported in by 220V alternating currents 7 to protected electrical equipment 8, threshold voltage detection module 2 be connected to zero line and ground wire it
Between, alarm module 3 and switching value output module 4 are connected with threshold voltage detection module 2 respectively, and switching value output module 4 is exported
Control signal works to triple-pole switch 5, control triple-pole switch 5.When " ground wire " is bad and powered, when its electrified voltage exceedes danger
During dangerous thresholding, present invention output sound and light hazard, and whole connections of electrical appliance and power supply are automatically cut off, isolation is dangerous
Source, to ensure safety.
Accompanying drawing 7 is refer to, the present embodiment is the simplification embodiment of the present invention, can be referred to as semi-automatic protected mode, is protected
Protection unit only includes threshold voltage detection module 2 and alarm module 3, when threshold voltage detection module 2 detects " ground wire " no
Good and powered, when its electrified voltage exceedes dangerous thresholding, present invention output sound and light hazard point out user to note in time
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 invention, only one neon bulb and a current-limiting resistance group
Into neon bulb and current-limiting resistance collectively constitute threshold voltage detection module, and neon bulb is provided simultaneously with threshold voltage detection and light hazard
There is no sound alarm in two kinds of effects, the present embodiment, only light hazard is a kind of.
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 in the absence of this hidden danger, 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 in that, 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 there occurs simultaneously, the moment of electric shock,
Existing leakage switch still can be acted, 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 seriously, no matter leak electricity
How stream adds up, very big danger close, is acted all without the leakage switch allowed in system, and exists 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 well 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, all exist after drawing electric brake
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 it is bad just more troublesome without any sign, or when good during ground wire.And use the present invention's
After protection device, dangerous voltage, and alarm prompt, or even automatism isolation in time can be detected at any time, it is to avoid Danger Electric shock risk occurs,
This intrinsic hidden danger of existing home-use alternating current system can be solved.
When apparatus of the present invention are realized, to full-automatic mode, three-pole gang operated switch must be the linkage of three poles, equivalent to there is danger
The attaching plug of electrical appliance is pulled equally when dangerous（Linked if not 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 not limited, in physical form, can with it is existing
Any combination such as various plugs, socket, switch, relay are realized, detection is alerted and control circuit is added, fully profit
With existing resource, can also compared with such as air switch, leakage switch etc. combine, form multifunction switch, it is necessary to
Note wanting three poles to link.
The present invention can detect " ground wire " it is unexpected powered dangerous, and alarm can be sent in time, but also can lead to
Cross cut-out, the mode of isolation electrical appliance to be protected, to avoid personnel from getting an electric shock, it is ensured that safety.
Claims (10)
1. a kind of abnormal protection device of ground wire, 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.
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 protection device also includes opening
Module and switching value output module are closed, switching value output module is connected on threshold voltage detection module, threshold voltage detection mould
Block controlling switch amount output module is worked, and switch module is connected with switching value output module, switching value output module controlling switch
Module works.
4. the abnormal protection device of ground wire according to claim 3, it is characterized in that：Described switch module uses three poles
Linked switch.
5. the abnormal protection device of ground wire according to claim 3, 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.
6. a kind of abnormal protection system of ground wire, it is characterized in that：Described protection system is included as appointed in claim 1 to 5
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 is connected between the zero line of 220V electric mains and ground wire.
7. the abnormal protection system of ground wire according to claim 6, it is characterized in that：Described 220V electric mains and use
It is serially connected between electric equipment on switch module, threshold voltage detection module and is connected with switching value output module, output switch parameter mould
Block is connected with switch module.
8. a kind of ground wire of the protection device abnormal using the ground wire as described in any one in claim 1 to 5 is abnormal
Guard method, it is characterized in that：Described guard method is to connect thresholding between the zero line and ground wire of 220V electric mains
Voltage detection module, detects whether the voltage on ground wire exceedes dangerous voltage thresholding using threshold voltage detection module, works as door
When the voltage that voltage limit detection module detects on ground wire exceedes dangerous voltage thresholding, then threshold voltage detection circuit control is reported
Alert module is alarmed.
9. the abnormal guard method of ground wire according to claim 8, it is characterized in that：Described protection device also includes opening
Module and switching value output module are closed, switching value output module is connected on threshold voltage detection module, switch module and switch
Output module connection is measured, when the voltage that threshold voltage detection module is detected on ground wire exceedes dangerous voltage thresholding, switch
Output module controlling switch module is measured to disconnect.
10. the abnormal guard method of ground wire according to claim 9, it is characterized in that：Connected on described switch module
There are input interface and output interface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064160A (en) * | 2019-12-24 | 2020-04-24 | 深圳供电局有限公司 | Mobile distribution box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101046490A (en) * | 2007-04-24 | 2007-10-03 | 刘锦泰 | Alarm device for abnormality in earthing system |
| CN101459302A (en) * | 2008-12-26 | 2009-06-17 | 钱加灿 | All-purpose leakage protection plug for ground wire live trip |
| CN203339427U (en) * | 2013-06-13 | 2013-12-11 | 彭忠华 | Intelligent safety power socket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046490A (en) * | 2007-04-24 | 2007-10-03 | 刘锦泰 | Alarm device for abnormality in earthing system |
| CN101459302A (en) * | 2008-12-26 | 2009-06-17 | 钱加灿 | All-purpose leakage protection plug for ground wire live trip |
| CN203339427U (en) * | 2013-06-13 | 2013-12-11 | 彭忠华 | Intelligent safety power socket |
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| CN111064160A (en) * | 2019-12-24 | 2020-04-24 | 深圳供电局有限公司 | Mobile distribution box |
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Application publication date: 20170725 |