CN104422830B - Earth leakage protective device and creepage protection function detection method - Google Patents
Earth leakage protective device and creepage protection function detection method Download PDFInfo
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Abstract
Provide a kind of earth leakage protective device and creepage protection function detection method.The creepage protection function detection method includes: periodically to judge whether the present timing time reaches predetermined time length when earth leakage protective device is set as automatic detecting state；In the case where judging that the present timing time reaches the predetermined time length; earth leakage protective device automatic imitation generates the leakage current in power grid; measure the leakage current in power grid; and judge whether leakage current is greater than predetermined leakage current threshold values; and in the case where simulating generation leakage current in power grid and judge the leakage current in power grid no more than predetermined leakage current threshold values, creepage protection function fault-signal or output breaker disjunction control signal are exported.Thus, it is possible to carry out periodic detection to earth leakage protective device without manual operation, the earth leakage protective performance of earth leakage protective device is ensured that, various risks and loss due to caused by earth leakage protective device failure can be effectively avoided.
Description
Technical field
The present invention relates to earth leakage protective field, relate more specifically to a kind of earth leakage protective device and creepage protection function detection side
Method.
Background technique
Earth leakage protective device is a kind of safe electrical appliance, the phase line Leaked Current of Line to Ground occurred inside protection power grid by detection
The size of electric current or shock current issues breaker disjunction control signal and completes breaker disjunction to disconnect power grid power supply.
As a kind of safe electrical appliance, the requirement to earth leakage protective device capability and performance is very strict.It is installed in earth leakage protective device
After, the working characteristics of operating operation test button detection earth leakage protective device is answered, confirmation can just allow to put into after regular event
It uses.Moreover, also periodically should test its reliability by test button in use, user needs periodically (for example, each
Test in a month is primary) test.But user is in actual use, seldom progress periodic detection, to personal safety, apparatus insulated
There are potential risks for equal protections.It, will when shock current or the generation of phase line earth leakage current once earth leakage protective device fails
Generate huge loss.
Therefore, it is necessary to a kind of earth leakage protective devices with self-checking function, can be in the feelings without user's manual operation
Periodic detection is carried out to earth leakage protective device under condition.
Summary of the invention
The embodiment of the invention provides a kind of earth leakage protective device and creepage protection function detection methods, can be not necessarily to
Periodic detection is carried out to earth leakage protective device in the case where manual operation, earth leakage protective is ensured while alleviating burden for users
The earth leakage protective reliable performance of device.
According to an aspect of the present invention, a kind of creepage protection function detection method is provided, comprising: the periodically current meter of judgement
When the time whether reach predetermined time length；In the case where judging that the present timing time reaches the predetermined time length, leakage
Non-electricity protector automatic imitation generates the leakage current in power grid, measures the leakage current in power grid and judges whether leakage current is big
In presetting leakage current threshold values, and in power grid, simulation generates leakage current and judges that the leakage current in power grid is little
In the case where predetermined leakage current threshold values, exports creepage protection function fault-signal or output breaker disjunction controls signal.
According to a further aspect of the invention, a kind of earth leakage protective device is provided, comprising: control module, for the predetermined time
Length carries out timing, and exports leakage analog when reaching the predetermined time length and control signal；Leakage analog module is used
Signal, and the electric leakage in the control Imitating power grid of leakage analog control signal are controlled in receiving the leakage analog
Electric current；And leakage current detecting module, for measuring the leakage current in power grid, and export detection signal；Wherein, the control
Molding block also receives the detection signal, and the case where the control module has outputed leakage analog control signal
Under, according to institute received detection signal judge the leakage current in power grid be not more than predetermined leakage current threshold value when export leak electricity
Defencive function fault-signal or output breaker disjunction control signal.
Hand can be not necessarily to using earth leakage protective device according to an embodiment of the present invention and creepage protection function detection method
Periodic detection is carried out to earth leakage protective device in the case where dynamic operation, ensures that the earth leakage protective performance of earth leakage protective device, it can
To be effectively prevented from various risks and loss due to caused by earth leakage protective device failure.
Detailed description of the invention
Pass through the detailed description below by attached drawing, it will the present invention is more easily to understand, wherein identical label is specified
Mutually isostructural unit, and wherein:
Fig. 1 shows a kind of schematic diagram of earth leakage protective device in the prior art；
Fig. 2 shows the flow charts one of creepage protection function detection method according to an embodiment of the present invention；
Fig. 3 shows the flowchart 2 of creepage protection function detection method according to an embodiment of the present invention；
Fig. 4 shows the flow chart 3 of creepage protection function detection method according to an embodiment of the present invention；
Fig. 5 shows the schematic block diagram of earth leakage protective device according to an embodiment of the present invention；And
Fig. 6 shows the schematic diagram of earth leakage protective device according to an embodiment of the present invention.
Specific embodiment
It provides with reference to the present invention of the description to help comprehensive understanding to be limited by appended claims and their equivalents below attached drawing
Exemplary embodiment.It includes various details to help understanding, but it should they are thought only exemplary.Therefore,
It will be appreciated by those of ordinary skill in the art that can with various changes and modifications are made to the embodiments described herein, without
Away from scope and spirit of the present invention.Equally, for clarity and conciseness, the description to known function and structure is omitted.
It is specifically included that as shown in Figure 1, showing a kind of schematic diagram of earth leakage protective device, earth leakage protective device in the prior art
Zero sequence current mutual inductor (ZCT) 10, leakage current processing module 20, control module 30, breaker module 40 and leakage analog
Module 50.
ZCT10 measures the leakage current in power grid, and leakage current processing module 20 carries out the measuring signal that ZCT10 is exported
Processing meets the leakage current transformation signal of 30 input request signal of control module to generate, and control module 30 is according to leakage current
The leakage current transformation signal that processing module 20 exports determines whether the leakage current in current electric grid is greater than predetermined leakage current
Threshold value.
Breaker module 40 includes disconnect switch control module and disconnect switch.
The both ends of leakage analog module 50 respectively with any phase power supply line in the power grid lead-in wire terminal of ZCT10 and power grid leading-out terminal
Lead-in wire terminal A connected with leading-out terminal B, and including Manual test button and resistor.
Earth leakage protective device after the installation is completed, user's operation Manual test button, as a result, in addition to the lead-in wire terminal A of ZCT10 and
Outside direct path between leading-out terminal B, another connecting path between the lead-in wire terminal A of ZCT10 and leading-out terminal B is connected, this is another
One connecting path is pressed by the Manual test button and is connected, and has thus shunted original in another connecting path
The electric current that should be flowed through in the direct path between the lead-in wire terminal A and leading-out terminal B of ZCT10.Therefore, zero sequence current mutual inductor
ZCT10 can detect that leakage current exists, thus term " leakage current in power grid " here means for ZCT10
Leakage current, and may be actually occurred due to power grid electric leakage and generate (that is, power grid generation leak current fault), it is also possible to due to
Above-mentioned leakage analog module 50 acts and generates (that is, power grid is normal, leakage analog module simulation failure).
For earth leakage protective device as shown in Figure 1, it is desirable that user's periodic operation Manual test button carrys out periodic detection electric leakage
The working performance of protector.However, in actual use, due to various reasons, it is difficult to ensure that user being capable of periodic operation
Manual test button carrys out the working performance of periodic detection earth leakage protective device.
In view of the situation, the embodiment of the present invention proposes a kind of creepage protection function detection method, can be not necessarily to
User carries out periodic detection to the working performance of earth leakage protective device in the case where being manually operated.
Creepage protection function detection method according to an embodiment of the present invention will be described with reference to Fig. 2-Fig. 4.
Fig. 2 shows the flow charts one of earth leakage protective detection method according to an embodiment of the present invention.
In step S210, judge whether the present timing time reaches predetermined time length.Predetermined time length can be pair
Earth leakage protective device carries out detection time interval required by periodic detection, such as one month, three months.Whenever reaching the predetermined time
When length, just start the performance detection to earth leakage protective device, and restart timing.
It is according to an embodiment of the present invention when step S210 judges that the present timing time reaches the predetermined time length
Earth leakage protective detection method proceeds to step S220.
Leakage current in step S220, simulating grid.In step S220, it is manually operated without user, automatically
Leakage current in simulating grid.For example, as shown in Figure 1 manual operation button or with shown in Fig. 1 be manually operated
The controllable switch of button parallel connection can be connected by the control of control module, thus the automatically leakage current in simulating grid.
For passing through one of the more power supply lines for measuring the zero sequence current mutual inductor of practical leakage current in power grid,
The power supply line is across the lead-in wire terminal of zero sequence current mutual inductor and leading-out terminal, and conducting is except the connecting path being made of the power supply line
Except another connecting path.
Therefore, between lead-in wire terminal A and leading-out terminal B shown in Fig. 1, other than the direct path existing for the script, by leading
Lead to another additional connecting path partly to shunt in the direct path between the lead-in wire terminal A and leading-out terminal B of ZCT10 originally and flow
The leakage current crossed and incuded by zero sequence current mutual inductor.
In addition, in step S220 leakage analog control signal can also be exported, and control signal in the leakage analog
Control under, the leakage current in simulating grid.
In step S230, the leakage current in power grid is measured.It can be measured in power grid by zero sequence current mutual inductor
Leakage current.As previously mentioned, " leakage current " described here refer to be for zero sequence current mutual inductor electric leakage electricity
Stream, and electric leakage may be actually occurred due to power grid and generate (that is, grid collapses, practical leakage current), it is also possible to by
It is acted in above-mentioned leakage analog and generates and (that is, power grid is normal, simulate leakage current).
In step S240, judge whether the leakage current in power grid is greater than predetermined leakage current threshold value.Predetermined leakage current
Threshold value is preset permissible leakage current threshold value.In earth leakage protective device normal operating and without carrying out leak current fault simulation
In the case where, once leakage current detected is more than permissible leakage current threshold value, then it may determine that power grid occurs
Leak current fault.
As previously described, because simulating grid power leakage electric current in step S220 and measuring power grid in step S230
In leakage current, in the case where earth leakage protective device normal operating, the leakage current in measured power grid should be greater than institute
State predetermined leakage current threshold value.Conversely, can then can be shown that earth leakage protective device breaks down.
The case where leakage current in power grid detected is no more than predetermined leakage current threshold value is judged in step S240
Under, creepage protection function detection method according to an embodiment of the present invention proceeds to step S250.
In step S250, creepage protection function fault-signal is exported.Advantageously, in the control of creepage protection function fault-signal
Under system, alarm signal can be further exported, such as warning lamp flashing or alarm bell sound.
Alternatively or in addition to, breaker disjunction control signal can also be exported in step s 250, pass through open circuit
The power supply of device disjunction power grid, i.e. implementation earth leakage protective movement.
On the other hand, when judge in step S240 the leakage current in power grid detected be greater than predetermined leakage current threshold
In the case where value, creepage protection function detection method according to an embodiment of the present invention proceeds to step S260.
In step S260, the present timing time is reset, and stops simulating leakage current.In addition, when in step S220
In output leakage analog control signal in the case where, leakage analog control signal is also removed in step S260.
By the operation of step S210-S260 as shown in Figure 2, can automatically the electric leakage to earth leakage protective device protect
It protects performance and carries out periodic detection.
In addition, when judging that the present timing time is not up to the predetermined time length in step S210, according to the present invention
The earth leakage protective detection method of embodiment proceeds to step S270.
In step S270, the leakage current in power grid is measured.
In step S280, judge whether the leakage current in power grid is greater than predetermined leakage current threshold value.
In the case where not simulating leakage current in power grid, judge that the leakage current in power grid is greater than institute in step S280
In the case where stating predetermined leakage current threshold value, then show to detect actually occur leak current fault in power grid；Conversely, showing electricity
Do not occur leak current fault in net.
Therefore, the case where leakage current in power grid is greater than the predetermined leakage current threshold value is judged in step S280
Under, creepage protection function detection method according to an embodiment of the present invention proceeds to step S290.
In step S290, pass through the power supply of breaker disjunction power grid, i.e. implementation earth leakage protective movement.
Fig. 3 shows the flowchart 2 of earth leakage protective detection method according to an embodiment of the present invention.Step shown in Fig. 2
Before S210, it can also first determine that implement earth leakage protective performance detects automatically, and start to carry out timing to predetermined time length.
In step s310, autosensing mode setting operation is received.Autosensing mode setting operation can be user
The autosensing mode setting operation carried out manually, is also possible to complete after the installation is completed in earth leakage protective device and detects it manually
The autosensing mode setting operation carried out automatically afterwards.
For example, autosensing mode setting button and manual detection mode setting button can be set, user can be by
Lower autosensing mode setting button perhaps manual detection mode setting button so as to correspondingly trigger autosensing mode or
Manual detection mode.
For example, automatic/hand detection pattern setting button can be set, detection manually is triggered when user presses the button
Otherwise mode is defaulted as autosensing mode；Vice versa.
For example, being not provided with autosensing mode setting button and/or manual detection mode setting button, pass through in user
It is manually pressed by Manual test button and triggers in Manual test and the successful situation of Manual test, can be automatically switched to certainly
Dynamic detection pattern.In the case, Manual test is successfully to be regarded as autosensing mode setting operation.
In step S320, into autosensing mode, zero is set by the present timing time.
In step S330, timing is carried out to the predetermined time length.
Next, earth leakage protective detection method according to an embodiment of the present invention proceeds to step S210, present timing is judged
Whether the time reaches the predetermined time length.
The operation of step S210 to S290 is identical as the operation of step S210 to S290 in Fig. 2 in Fig. 3, no longer carries out herein
It repeats.
In the case where judging the leakage current in power grid in step S280 no more than the predetermined leakage current threshold value,
That is: it does not simulate leakage current in power grid and judges the leakage current in power grid no more than the predetermined leakage current threshold value
In the case where, creepage protection function detection method return step S330 according to an embodiment of the present invention continues to the pre- timing
Between length carry out timing.
In addition, after resetting the present timing time in step S260, earth leakage protective function according to an embodiment of the present invention
Energy detection method also returns to step S330, to carry out timing to the predetermined time length again.
Fig. 4 shows the flow chart 3 of earth leakage protective detection method according to an embodiment of the present invention.Step shown in Fig. 3
Before S310, Manual test operation can also be performed.
In step S410, manual detection mode setting operation is received.
In step S420, manual fault simulation operation is received, the manual fault simulation operation includes: to be used for for passing through
One of the more power supply lines of zero sequence current mutual inductor for measuring leakage current in power grid pass through zero sequence current mutual inductance in the power supply line
Between the lead-in wire terminal and leading-out terminal of device, another connection in addition to the connecting path being made of the power supply line is manually connected and leads to
Another additional connecting path other than the connecting path for passing through zero sequence current mutual inductor is manually connected in road.
For example, manual operation button as shown in Figure 1 can be pressed, connect includes manual operation as shown in Figure 1
The connecting path of button and resistor, to partly shunt originally direct between the lead-in wire terminal A and leading-out terminal B of ZCT10
The electric current for flowing through in access and being incuded by zero sequence current mutual inductor, thus simulates leakage current in power grid.
In step S430, the leakage current in power grid is measured.
In step S440, judge whether the leakage current in power grid is greater than predetermined leakage current threshold value.
As previously mentioned, manually simulating leakage current in the step s 420 and being measured in power grid in step S430
Leakage current, in the case where earth leakage protective device normal operating, leakage current in measured power grid should be greater than described
Predetermined leakage current threshold value.Conversely, can then can be shown that earth leakage protective device breaks down.
In the case where judging that the leakage current in power grid is greater than the predetermined leakage current threshold value in step S440, according to
The creepage protection function detection method of the embodiment of the present invention proceeds to step S310, receives autosensing mode setting operation.
Conversely, judging the case where leakage current in power grid is no more than the predetermined leakage current threshold value in step S440
Under, creepage protection function detection method according to an embodiment of the present invention proceeds to step S450.
In step S450, creepage protection function fault-signal is exported.
Alternatively or in addition to, breaker disjunction control signal can also be exported in step S450, pass through open circuit
The power supply of device disjunction power grid, i.e. implementation earth leakage protective movement.
The operation of step S310-S330 is identical as the operation of step S310-S330 in Fig. 3 in Fig. 4, step in Fig. 4
The operation of S210 to S290 is identical as the operation of step S210 to S290 in Fig. 2, is no longer repeated herein.
Fig. 5 shows the schematic block diagram of earth leakage protective device according to an embodiment of the present invention.It is according to an embodiment of the present invention
Earth leakage protective device includes: zero sequence current mutual inductor (ZCT) 510, leakage current processing module 520, control module 530, breaker
Module 540 and leakage analog module 550.
Zero sequence current mutual inductor (ZCT) 510 and leakage current processing module 520 can be referred to as to leakage current detection mould
Block, for measuring the leakage current in power grid and output meets the detection signal of 530 input request signal of control module.
Although describing current sensor by taking zero sequence current mutual inductor (ZCT) as an example in embodiments of the present invention, this
It invents without being limited thereto.
Control module 530 is used to carry out timing to predetermined time length, and defeated when reaching the predetermined time length
Leakage analog controls signal out.
Breaker module 540 includes disconnect switch and disconnect switch control module.
Leakage analog module 550 controls in the leakage analog and believes for receiving the leakage analog control signal
Number control Imitating power grid in leakage current.
The control module 530 also receives the detection signal, and has outputed electric leakage in the control module 530
In the case where analog control signal, according to institute received detection signal judge the leakage current in power grid be not more than make a reservation for leak electricity
Creepage protection function fault-signal is exported when current threshold.
Alternatively or in addition to, the control module 530 can also export breaker disjunction control signal, described disconnected
Leakage circuit breakers executing agency in road device module 540 receives the breaker disjunction and controls signal, and in the breaker
The disjunction for the disconnect switch for including in the breaker module is realized under the control of disjunction control signal, to disconnect the power grid
Power supply.
As previously mentioned, having outputed leakage analog control signal (grid power leakage fault simulation has been carried out)
In the case of, the control module 530 should judge the leakage current in the leakage current processing module power grid detected
Greater than predetermined leakage current threshold value., whereas if the control module 530 judges that the leakage current processing module is detected
Power grid in leakage current be not more than predetermined leakage current threshold value, then show earth leakage protective device failure cannot effectively rise
To protective effect.The earth leakage protective device failure may include the leakage current detecting module failure or institute
State control module failure.
The leakage current processing module 520 receives sensed zero-sequence current from the zero sequence current mutual inductor 510, and
And it can be for example including sample circuit and A/D converter circuit.The control module 530 may include microcontroller, the micro-control
Device processed receives digitized zero-sequence current value from the A/D converter circuit, according to the received digitized zero-sequence current value judgement of institute
Whether the leakage current in power grid is greater than predetermined leakage current threshold value.
Alternatively, the leakage current processing module 520 can be for example including sample circuit, the control module 530
Including microcontroller, the microcontroller receives sampling zero-sequence current value from the sample circuit, to the received sampling zero sequence of institute
Current value is AD converted, and judges whether the leakage current in power grid is greater than predetermined leakage current threshold value.
In addition, using as shown in figure 5, earth leakage protective device according to an embodiment of the present invention can also include: alarm module 560
In the reception creepage protection function fault-signal, and alarm is issued under the control of the creepage protection function fault-signal
Signal.
Alarm module 560 may include light emitting diode, controllable switch element and light emitting diode or controllable switch member
Part and ring.According to different application needs, alarm module 560 can take other forms.
In addition, in the case where the control module 530 has outputed leakage analog control signal, in the control mould
Block 530 according to received detection signal judge the leakage current in power grid be greater than predetermined leakage current threshold value when, the control
Module 530 restarts to carry out timing to the predetermined time length, and removes the leakage analog control signal.
The control module 530 according to received detection signal judge that the leakage current in power grid is greater than predetermined electric leakage
In the case that current threshold but the control module 530 do not export leakage analog control signal, the control module output is disconnected
Road device disjunction controls signal.Disconnect switch control module in the breaker module 540 receives the breaker disjunction control
Signal, and the disconnect switch for including in the breaker module is realized under the control of breaker disjunction control signal
Disjunction, to disconnect the power supply of the power grid.
As shown in figure 5, the leakage analog module 550 may include the first leakage analog access, the first electric leakage mould
The first end of quasi- access is connected to the lead-in wire terminal A of one of power supply line in the power grid lead-in wire terminal of the zero sequence current mutual inductor, the
Two ends are connected to the leading-out terminal B of the power supply line in the power grid leading-out terminal of the zero sequence current mutual inductor, and first electric leakage
Analog channel includes the first leakage analog control switch.
In the case where the control module 530 exports the leakage analog control signal, controlled in the leakage analog
Under the control of signal, the first end and second end of the first leakage analog access is connected in the first leakage analog control switch
Between electrical connection.
In addition, described second leaks electricity as shown in figure 5, the leakage analog module 550 further includes the second leakage analog access
The first end of analog channel is connected to the lead-in wire terminal A of one of power supply line in the power grid lead-in wire terminal of the zero sequence current mutual inductor,
Second end is connected to the leading-out terminal B of the power supply line in the power grid leading-out terminal of the zero sequence current mutual inductor, and second leakage
Electrical analogue access includes the second leakage analog control switch.
Second leakage analog switches can be Manual test button, press the feelings of the Manual test button in user
Under condition, the electricity between the first end and second end of the second leakage analog access is connected in the second leakage analog control switch
Connection.
As shown in figure 5, the first leakage analog access and the second leakage analog access can partly overlap, such as
Resistor as shown in Figure 5 can be used as a part of the first leakage analog access, can also be used as second electric leakage
A part of analog channel.
Alternatively, the first leakage analog access and the second leakage analog access can be completely different from each other,
For example, the first leakage analog access includes the first leakage analog control switch and first resistor device, the second electric leakage mould
Quasi- access includes the second leakage analog control switch and second resistor, and the first resistor device and the second resistor are each other
Difference, the first end and second end of the first leakage analog access respectively with the first end of the second leakage analog access and
Second end connection.
In addition, as shown in figure 5, the earth leakage protective device can also include detection pattern setup module 580, for automatic
Automatic detection signal is exported to the control module 530 when detection pattern is set.
The detection pattern setup module 580 may include that autosensing mode setting button and manual detection mode are set
Set button.User can press autosensing mode setting button or manual detection mode setting button, correspondingly to touch
Send out autosensing mode or manual detection mode.When autosensing mode is set, the detection pattern setup module 580
Automatic detection signal is exported, and when manual detection mode is set, the detection pattern setup module 580 exports manual detection
Signal stops output automatic detection signal.
Alternatively, the detection pattern setup module 580 may include automatic/hand detection pattern setting button,
User triggers manual detection mode when pressing the button, be otherwise defaulted as autosensing mode；Vice versa.It is pressed in the button
When lower, the detection pattern setup module 580 exports automatic detection signal, and when the button is not pressed, the detection
Mode setting module 580 exports detection signal manually or stops output automatic detection signal.
Alternatively, the detection pattern setup module 580 may include toggle switch, be in first in toggle switch
When setting, the detection pattern setup module 580 exports automatic detection signal, when toggle switch is in the second position, the inspection
Mode setting module 580 is surveyed to export detection signal manually or stop output automatic detection signal.
The control module 530 just carries out the predetermined time length after receiving the automatic detection signal
Timing, and export leakage analog when reaching the predetermined time length and control signal.The control module 530 is receiving
The manual detection signal or when not receiving the automatic detection signal, stops carrying out timing to predetermined time length.
In addition, there is fixed vibration for generating as shown in figure 5, the earth leakage protective device can also include oscillating circuit 570
The pulse in period is swung, and the pulse is supplied to the control module 530, the control module 530 carries out the pulse
It counts, to carry out timing to the predetermined time length.
Alternatively, the control module 530 can be built-in with oscillating circuit, and defeated according to the oscillating circuit built in it
The pulse with the built-in oscillation period out carries out timing to the predetermined time length.
Fig. 6 shows the schematic diagram of breaker protector according to an embodiment of the present invention.Except module shown in fig. 5
Outside, the auxiliary circuits such as anti-impact circuit MOV, anti-jamming circuit EMC, bridge rectifier, voltage regulator circuit are also shown in Fig. 6.
As shown in fig. 6, oscillating circuit 570 is implemented as OSC timing circuit, control module 530 is implemented as microcontroller
MCU, detection pattern setup module 580 are implemented as automatic/hand selection switch, and breaker module is implemented as controllable switch
T1, executing agency B and disconnect switch.
Hand can be not necessarily to using earth leakage protective device according to an embodiment of the present invention and creepage protection function detection method
Periodic detection is carried out to earth leakage protective device in the case where dynamic operation, ensures that the earth leakage protective performance of earth leakage protective device, it can
To be effectively prevented from various risks and loss due to caused by earth leakage protective device failure.
In addition, earth leakage protective device according to an embodiment of the present invention and creepage protection function detection method, it can be any
Moment is switched to manual mode and carries out earth leakage protective device performance detection, therefore behaviour that can well with existing earth leakage protective device
It is consistent.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. a kind of creepage protection function detection method is used for earth leakage protective device, this method comprises:
Periodically judge whether the present timing time reaches predetermined time length；
In the case where judging that the present timing time reaches the predetermined time length, automatic imitation generates the electric leakage electricity in power grid
Stream；
It measures the leakage current in power grid and judges whether the leakage current in power grid is greater than predetermined leakage current threshold value；And
Simulation generates leakage current and judges the leakage current in power grid no more than predetermined leakage current threshold value in power grid
In the case of, it exports creepage protection function fault-signal or output breaker disjunction controls signal,
The creepage protection function detection method also generates the pulse with the built-in oscillation period, and counts to the pulse
Number, to carry out timing to the predetermined time length,
Wherein, the leakage analog module of the earth leakage protective device includes the first leakage analog access, and first leakage analog is logical
One of the power supply line that the first end on road is connected in the power grid lead-in wire terminal of the zero sequence current mutual inductor of measurement leakage current enters line
End, second end are connected to the leading-out terminal of the power supply line in the power grid leading-out terminal of the zero sequence current mutual inductor, and described first
Leakage analog access includes the first leakage analog control switch, and the leakage analog module further includes the second leakage analog access,
The first end of the second leakage analog access be connected to the power supply line in the power grid lead-in wire terminal of the zero sequence current mutual inductor it
One lead-in wire terminal, second end are connected to the leading-out terminal of the power supply line in the power grid leading-out terminal of the zero sequence current mutual inductor, and
The second leakage analog access includes the second leakage analog control switch,
The earth leakage protective device further include: for carrying out timing to predetermined time length, and when reaching predetermined time length
The control module for exporting leakage analog control signal, in the leakage analog control letter that control module output is tested automatically
In the case where number, the first leakage analog control switch be connected the first leakage analog access first end and second end it
Between electrical connection；
In the case where the leakage analog of control module output manual test controls signal, second leakage analog
Being electrically connected between the first end and second end of the second leakage analog access is connected in control switch.
2. creepage protection function detection method as described in claim 1, further includes:
Under the control of the creepage protection function fault-signal, alarm signal is exported.
3. creepage protection function detection method as described in claim 1, wherein judging that the present timing time reaches described pre-
In the case where length of fixing time, output leakage analog controls the leakage current in signal and simulating grid, and the electric leakage is protected
Protective function detection method further include:
In the case where simulating leakage current in power grid and judge that the leakage current in power grid is greater than predetermined leakage current threshold value,
The present timing time is reset, and correspondingly removes the leakage analog control signal.
4. creepage protection function detection method as described in claim 1, wherein judging that it is pre- that the leakage current in power grid is greater than
In the case where determining leakage current threshold value but the not leakage current in simulating grid, pass through the confession of power grid described in breaker disjunction
Electricity.
5. creepage protection function detection method as described in claim 1, wherein the leak current fault in simulating grid includes:
It exports leakage analog and controls signal；And
It is mutual for measuring the zero-sequence current of leakage current in power grid for passing through under the control of leakage analog control signal
One of more power supply lines of sensor, in the power supply line across the lead-in wire terminal of zero sequence current mutual inductor and leading-out terminal, conducting is removed
Another connecting path except the connecting path be made of the power supply line.
6. creepage protection function detection method as described in claim 1 is judging whether the present timing time reaches pre- timing
Between before length, further includes:
Receive autosensing mode setting operation；And
Zero is set by the present timing time, and starts to carry out timing to the predetermined time length.
7. creepage protection function detection method as claimed in claim 6, before receiving autosensing mode setting operation, also
Include:
Receive manual detection mode setting operation；
Manual fault simulation operation is received, the manual fault simulation operation includes: to leak electricity for passing through for measuring in power grid
One of more power supply lines of the zero sequence current mutual inductor of electric current pass through the lead-in wire terminal of zero sequence current mutual inductor in the power supply line and go out
Between line end, another connecting path in addition to the connecting path being made of the power supply line is manually connected；
It measures the leakage current in power grid and judges whether the leakage current in power grid is greater than predetermined leakage current threshold value；And
In the case where judging the leakage current in power grid no more than predetermined leakage current threshold value, creepage protection function failure is exported
Signal or output breaker disjunction control signal.
8. a kind of earth leakage protective device, comprising:
Control module for carrying out timing to predetermined time length, and exports electric leakage when reaching the predetermined time length
Analog control signal；
Leakage analog module, for receiving the leakage analog control signal, and in the control of leakage analog control signal
Leakage current in Imitating power grid processed；And
Leakage current detecting module for measuring the leakage current in power grid, and exports detection signal；
Wherein, the control module also receives the detection signal, and has outputed leakage analog in the control module
Control signal in the case where, according to institute received detection signal judge the leakage current in power grid be not more than predetermined leakage current
Creepage protection function fault-signal is exported when threshold value or output breaker disjunction controls signal,
The earth leakage protective device further include: oscillating circuit, for generating the pulse with the built-in oscillation period, and by the pulse
It is supplied to the control module,
The control module counts the pulse, to carry out timing to the predetermined time length,
Wherein, the leakage analog module includes the first leakage analog access, and the first end of the first leakage analog access connects
It is connected to the lead-in wire terminal of one of power supply line in the power grid lead-in wire terminal of the zero sequence current mutual inductor of measurement leakage current, second end connection
The leading-out terminal of the power supply line into the power grid leading-out terminal of the zero sequence current mutual inductor, and the first leakage analog access packet
The first leakage analog control switch is included, the case where the leakage analog that control module output is tested automatically controls signal
Under, being electrically connected between the first end and second end of the first leakage analog access is connected in the first leakage analog control switch
It connects；
The leakage analog module further includes the second leakage analog access, and the first end of the second leakage analog access is connected to
The lead-in wire terminal of one of power supply line in the power grid lead-in wire terminal of the zero sequence current mutual inductor, second end are connected to the zero-sequence current
The leading-out terminal of the power supply line in the power grid leading-out terminal of mutual inductor, and the second leakage analog access includes the second leakage analog
Control switch, in the case where the leakage analog of control module output manual test controls signal, second leakage
Being electrically connected between the first end and second end of the second leakage analog access is connected in electrical analogue control switch.
9. earth leakage protective device as claimed in claim 8, further includes: alarm module, for receiving the creepage protection function event
Hinder signal, and issues alarm signal under the control of the creepage protection function fault-signal.
10. earth leakage protective device as claimed in claim 8, wherein outputed leakage analog control in the control module
In the case where signal, judging the leakage current in power grid greater than predetermined leakage current threshold value according to the received detection signal of institute
When, the control module restarts to carry out timing to the predetermined time length, and removes the leakage analog control letter
Number.
11. earth leakage protective device as claimed in claim 9, further includes: breaker module, for realizing in the breaker module
The disjunction for the breaker for including；
Wherein, the control module according to institute's received detection signal judge the leakage current in power grid be greater than make a reservation for leak electricity it is electric
In the case that stream threshold value but the control module do not export leakage analog control signal, the control module exports breaker
Disjunction controls signal；
The breaker module receives the breaker disjunction and controls signal, and in the control of breaker disjunction control signal
The lower disjunction for realizing the breaker for including in the breaker module of system.
12. earth leakage protective device as claimed in claim 9, further includes: detection pattern setup module, in autosensing mode
Automatic detection signal is exported to the control module when being set,
The control module just carries out timing to the predetermined time length after receiving the automatic detection signal, and
And leakage analog is exported when reaching the predetermined time length and controls signal.
13. earth leakage protective device as claimed in claim 12, wherein the detection pattern setup module is also used to detecting manually
Detection signal manually is exported to the control module when mode is set or stops exporting automatic detection to the control module
Signal,
The control module is when receiving the manual detection signal or not receiving the automatic detection signal, stopping pair
Predetermined time length carries out timing.
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| CN201310378989.5A CN104422830B (en) | 2013-08-27 | 2013-08-27 | Earth leakage protective device and creepage protection function detection method |
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| CN201310378989.5A CN104422830B (en) | 2013-08-27 | 2013-08-27 | Earth leakage protective device and creepage protection function detection method |
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| FR3037658B1 (en) * | 2015-06-16 | 2018-05-18 | Schneider Electric Industries Sas | METHOD AND DEVICE FOR DETECTING A FAULT IN AN ELECTRICAL NETWORK |
| CN107294059B (en) * | 2016-04-01 | 2019-11-05 | 苏州益而益电器制造有限公司 | Use electric detection means |
| CN107579505B (en) * | 2016-07-05 | 2019-05-24 | 苏州益而益电器制造有限公司 | Use electric detection means |
| CN106253216B (en) * | 2016-09-26 | 2018-11-06 | 东莞市达昌实业有限公司 | It is a kind of can timing earth leakage protective device |
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| CN206302016U (en) * | 2016-12-28 | 2017-07-04 | 东莞市拓诚实业有限公司 | A kind of timing earth leakage protective device |
| CN107069648B (en) * | 2017-03-22 | 2019-03-29 | 广州炫通电气科技有限公司 | Earth leakage protecting method |
| CN206710528U (en) * | 2017-04-24 | 2017-12-05 | 深圳曼顿科技有限公司 | Novel breaker earth detector and low-voltage circuit breaker |
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| CN109061360B (en) * | 2018-06-21 | 2020-12-15 | 浙江巨磁智能技术有限公司 | Leakage protection safety self-checking system and self-checking method thereof |
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