CN108631263A - Ground-fault protection system - Google Patents
Ground-fault protection system Download PDFInfo
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- CN108631263A CN108631263A CN201810204668.6A CN201810204668A CN108631263A CN 108631263 A CN108631263 A CN 108631263A CN 201810204668 A CN201810204668 A CN 201810204668A CN 108631263 A CN108631263 A CN 108631263A
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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
- H02H3/16—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 fault current to earth, frame or mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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
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- Emergency Protection Circuit Devices (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Abstract
A kind of ground-fault protection system, earth-fault protection include：Current transformer module, detection coil module and earth-fault protection breaker, earth-fault protection breaker connect current transformer module and detection coil module；Current transformer module includes：Current transformer；Detection coil module includes：Detection coil；Phase line and center line run through current transformer and detection coil；Current transformer module is suitable for forming mutual inductance in current transformer and detection coil, and when forming current path with earth-fault protection breaker, exports mutual inducing current to earth-fault protection breaker；Earth-fault protection breaker is suitable for exporting the disconnection for disconnecting phase line, center line and load connection according to mutual inducing current and controls signal；Detection circuit includes：Signal generator module；Signal generator module is suitable for output test signal；In a cycle of AC signal, there is test signal at least one pulse signal, pulse signal current transformer and detection coil to be made to generate mutual inductance.
Description
This application claims submitting on March 21st, 2017, Patent Office of the People's Republic of China, application No. is 201710170208.1, denominations of invention
For a kind of priority of the Chinese patent application of " ground fault protection circuit ", the application is hereby incorporated by reference in entire contents
In.
Technical field
The present invention relates to electronic field more particularly to a kind of ground-fault protection systems.
Background technology
In power supply system, in order to cope with load end since aging circuit, failure etc. cause the safety of human electric shock
Problem usually requires residual current circuit breaker of the installation with creepage protection function in the node of access load.Residual current is disconnected
Road device detects residual current, and when residual current is more than the threshold value of setting, the mechanical device that breaker makes it internal is threaded off, and is broken
Open the safety of the power supply of load, the protection person and equipment.
But relatively reliable guard method is to use earth-fault protection breaker (GFCI), this kind of breaker can not only
The leak current fault of phase line over the ground is detected, while neutral grounded failure can also be detected.
In order to verify the working condition of earth-fault protection breaker, the prior art is usually in earth-fault protection breaker
On be fitted with testing button, detect earth-fault protection breaker whether can normal work by periodically pressing testing button
Make.But actually terminal user seldom periodically carries out this detection.
Invention content
The technical problem to be solved by the present invention is to：How the automatic detection of automatic butt earth fault protective breaker is realized.
In order to solve the above technical problem, the present invention provides a kind of ground-fault protection systems, including：Earth-fault protection
Device and detection circuit.The earth-fault protection includes：Current transformer module, detection coil module and earth fault
Protective breaker, the earth-fault protection breaker connect the current transformer module and the detection coil module.Institute
Stating current transformer module includes：Current transformer；The detection coil module includes：Detection coil；Phase line and center line provide
AC signal, the phase line and center line run through the current transformer and the detection coil.The current transformer module is fitted
Lead in the current transformer and detection coil formation mutual inductance, and with earth-fault protection breaker formation electric current
Lu Shi exports mutual inducing current to the earth-fault protection breaker.The earth-fault protection breaker is suitable for according to
Mutual inducing current output disconnects the phase line, center line and the disconnection of load connection and controls signal.The detection circuit includes：Signal produces
Raw module.The signal generator module is suitable for output test signal；In a cycle of the AC signal, the test
There is signal at least one pulse signal, the pulse signal current transformer and the detection coil to be made to generate mutual inductance.
Optionally, the earth-fault protection breaker resets the residual current received after decontroling or mutual suitable for calculating
The inducing current duration exports the disconnection and controls signal when result of calculation is more than fault actions and is delayed.
Optionally, the aggregated duration of at least one pulse signal is delayed more than the fault actions.It is described extremely
A pulse signal includes less：The pulse signal of the corresponding AC signal positive half period, and the corresponding AC signal are negative
The pulse signal of half period.The aggregated duration of the pulse signal of the corresponding AC signal positive half period is less than the failure
Action delay.The aggregated duration of the pulse signal of the corresponding AC signal negative half-cycle prolongs less than the fault actions
When.
Optionally, the earth-fault protection further includes：Power module.The power module is suitable in the electricity
Source module under normal circumstances, protect by the first supply voltage to the earth fault provided more than or equal to supply voltage reset threshold
Protect the power end of breaker；It breaks down in the power module, provides and resetted less than or equal to the supply voltage
The second source voltage of threshold value to the earth-fault protection breaker power end.The earth-fault protection breaker is fitted
In when the power end of the earth-fault protection breaker receives the second source voltage, resetted.
Optionally, the earth-fault protection further includes：Power module.The power module includes：Full-bridge rectification
Circuit and the first RC circuits.The first input end of the full bridge rectifier connects the phase line, the full bridge rectifier
Second input terminal connects the center line, and the first output end of the full bridge rectifier connects the first of the first RC circuits
End, the second output terminal ground connection of the full bridge rectifier.The first RC circuits include：First resistor and the first capacitance, institute
The first end for stating first resistor connects the first end of the first RC circuits, the second end connection described first of the first resistor
The power end of the first end of capacitance and the earth-fault protection breaker, the second end ground connection of first capacitance.It is described to connect
Earth fault protective breaker is suitable for being less than or equal to supply voltage in the voltage of the power end of the earth-fault protection breaker
When reset threshold, resetted.
Optionally, the full bridge rectifier includes：First diode, the second diode, third diode and the four or two
Pole pipe.The anode of first diode connects the second input terminal of the cathode and the full bridge rectifier of the second diode,
The cathode of first diode connects the first output end of the cathode and the full bridge rectifier of the 4th diode.Described
The anode of two diodes connects the second output terminal of the anode and the full bridge rectifier of the third diode.The third
The cathode of diode connects the first input end of the anode and the full bridge rectifier of the 4th diode.
Optionally, the earth-fault protection further includes：Dropout module.The dropout module includes：It is silicon-controlled,
Five diodes, tripping coil and contact switch.The silicon-controlled control pole is suitable for receiving disconnections control signal, it is described can
The anode for controlling silicon connects the cathode of the 5th diode, the silicon-controlled minus earth.The anode of 5th diode connects
The first end of tripping coil.The second end of the tripping coil connects the phase line.The contact switch setting is in phase line in
On line, the contact switch is suitable for disconnecting the connection of the phase line and center line and load when the tripping coil is powered.
Optionally, the detection circuit further includes：Judging module.The judging module is suitable for judging the earth fault
Whether protective breaker outputs the disconnection control signal.
Optionally, the judging module, suitable for exporting probe current in the negative half-cycle of the AC signal, to judge
Whether the earth-fault protection breaker exports the disconnection control signal.
Optionally, the earth-fault protection further includes：Dropout module.The dropout module includes：It is silicon-controlled,
Five diodes, tripping coil and contact switch.The silicon-controlled control pole is suitable for receiving disconnections control signal, it is described can
The anode for controlling silicon connects the cathode and detective pin of the 5th diode, the silicon-controlled minus earth.5th diode
Anode connection tripping coil first end.The second end of the tripping coil connects the phase line.The contact switch setting
In phase line and center line, the contact switch is suitable for disconnecting the phase line and center line and load when the tripping coil is powered
Connection.The detective pin is suitable for receiving the probe current.
Optionally, the judging module, suitable for obtaining the load resistance shape of the detective pin by the probe current
State, and whether earth-fault protection breaker described in the load resistance condition adjudgement according to the detective pin exports the disconnection
Control signal.
Optionally, the detection circuit further includes：Alarm module.The alarm module is suitable for true in the judging module
When the fixed earth-fault protection breaker does not export the disconnection control signal, alarm is carried out.
Optionally, the signal generator module includes：Zero passage detection module and signal generator.The zero passage detection mould
Block, suitable for when detecting zero crossing of the phase line relative to the center line, exporting zero-crossing pulse signal.The signal occurs
Device, suitable for after receiving the zero-crossing pulse signal, generating at least one pulse signal.
Optionally, the detection circuit further includes：Judging module.The judging module is suitable for output probe current, to sentence
Whether the earth-fault protection breaker that breaks exports the disconnection control signal.
Optionally, the detection circuit further includes：Controllable switch and signal transmssion line.The control terminal of the controllable switch is suitable
In receiving the test signal, the first connecting pin of the controllable switch connects the first tie point of the signal transmssion line, institute
State the second connection end ground connection of controllable switch.Second tie point of the signal transmssion line connects the second company of the controllable switch
Connect end.Signal transmssion line between first tie point and the second tie point runs through the current transformer and the detection line
Circle.
Optionally, the signal transmssion line is multiplexed the center line.
The signal generator module of the present invention generates the test signal that simulated failure occurs, current transformer and the detection line
Circle forms mutual inductance under the driving of the test signal.When current transformer module, detection coil module and earth-fault protection are disconnected
When each component part in the device of road does not break down, test signal makes current transformer, detection coil and earth fault protect
It protects breaker and forms regenerative feedback loop, the earth-fault protection circuit breaker internal generates self-oscillation, current transformer module
Mutual inducing current is exported to earth-fault protection breaker.Earth-fault protection breaker can export disconnected according to the mutual inducing current
Open control signal.Therefore, when detecting disconnection control signal, show the ground connection event including earth-fault protection breaker
Barrier protective device does not break down, it is thus achieved that the automatic detection to earth fault protective breaker.
Description of the drawings
Fig. 1 is the ground-fault protection system structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the waveform correlation schematic diagram of the ground-fault protection system of the embodiment of the present invention.
Specific implementation mode
It is understandable to enable above-mentioned purpose, feature and the advantageous effect of the present invention to become apparent, below in conjunction with the accompanying drawings to this
The specific embodiment of invention is described in detail.
As shown in Figure 1, the embodiment of the present invention provides a kind of ground-fault protection system.
The ground-fault protection system includes：Earth-fault protection and detection circuit.
The earth-fault protection includes：Current transformer module 1, detection coil module 2 and earth-fault protection
Breaker 5.The earth-fault protection breaker 5 connects current transformer module 1 and detection coil module 2.
The current transformer module 1 includes：Current transformer 101.The detection coil module 2 includes：Detection coil
201.Phase line and center line provide AC signal, and the phase line and center line run through the current transformer 101 and the detection coil
201。
The current transformer module 1 can form mutual inductance in current transformer 101 and detection coil 201, and electric current is mutual
When sensor 101 and detection coil 201 form current path with earth-fault protection breaker 5, it is former to being grounded to export mutual inducing current
Hinder protective breaker 5.The earth-fault protection breaker 5 can be exported according to mutual inducing current disconnects control signal, described disconnected
The phase line, center line and the connection of load can be disconnected by opening control signal.The current path is regenerative feedback loop.
The detection circuit includes：Signal generator module 71.The signal generator module 71 can export test signal
TST.In a cycle of the AC signal, the test signal TST has at least one pulse signal, the pulse letter
The current transformer 101 and the detection coil 201 number is set to generate mutual inductance.
In the present embodiment, signal generator module 71 generates the test signal TST that simulated failure occurs, current transformer
101 and the detection coil 201 form mutual inductance under the driving of test signal TST.When the electric current of earth-fault protection is mutual
When each component part in sensor module 1, detection coil module 2 and earth-fault protection breaker 5 does not break down, electric current
Mutual inductor 101, detection coil 201 and earth-fault protection breaker 5 form regenerative feedback loop, the earth-fault protection open circuit
5 inside of device generates self-oscillation, the OSC pin outputting oscillation signals of the earth-fault protection breaker 5.The OSC pins
The oscillator signal of output makes current transformer module 11 export by the mutual inductance effect of detection coil 201 and current transformer 101
Mutual inducing current, current transformer module 11 export mutual inducing current to earth-fault protection breaker 5.Earth-fault protection breaker
5 can disconnect control signal according to the mutual inducing current output.Therefore, when detecting disconnection control signal, show ground connection event
Each component part of barrier protective device does not break down, it is thus achieved that the fault detect to earth-fault protection.
In the present embodiment, the current transformer module 1 can also current transformer 101 and detection coil 201 with
When earth-fault protection breaker 5 can not form regenerative feedback loop, mutual inducing current is not exported to earth-fault protection breaker 5.
Earth-fault protection breaker 5 then when not receiving the mutual inducing current, does not export disconnection control signal.
When the current transformer module 1, detection coil module 2 and earth-fault protection breaker of earth-fault protection
When certain section failure in 5, even if current transformer 101 and detection coil 201 generate mutual inductance, it can not also pass through failure
Part forms regenerative feedback loop with earth-fault protection breaker 5 and generates mutual inducing current.So current transformer module 11 is not
Mutual inducing current can be exported to the earth-fault protection breaker 5.Earth-fault protection breaker 5 will not export disconnection control letter
Number.Therefore, when that can not detect disconnection control signal, show that event has occurred in some component part of earth-fault protection
Barrier, is thus furthermore achieved the fault detect to earth-fault protection.
The composition of the ground-fault protection system of the present embodiment is described further below.
The current transformer module 1 may include current transformer 101, and current transformer 101 is directly connected to ground connection event
Hinder the input terminal of protective breaker 5.The current transformer module 1 can also include current transformer 101 and the first filtered electrical
Road 102, current transformer 101 connect the input terminal of earth-fault protection breaker 5 by the first filter circuit 102.
First filter circuit 102 includes second resistance R2,3rd resistor R3, the 4th resistance R4 and the second capacitance C2.
The first end of the first connecting pin and 3rd resistor R3 of the first end connection current transformer 101 of the second resistance R2.It is described
The first end of the second connection end and the 4th resistance R4 of the second end connection current transformer 101 of second resistance R2.The third
The second end of resistance R3 connects the first input end of the first end and earth-fault protection breaker 5 of the second capacitance C2.Institute
The second end for stating the 4th resistance R4 connects the second end of the second capacitance C2 and the second input of earth-fault protection breaker 5
End.
Detection coil module 2 may include：Detection coil 201 and third capacitance C3.The first of the detection coil 201 connects
End ground connection is connect, the second connection end of the detection coil 201 connects the first end of the third capacitance C3, the third capacitance C3
Second end connection earth-fault protection breaker 5 OSC pins.
Detection coil module 2 can also include：Detection coil 201, third capacitance C3 and for adjusting self-excited oscillatory frequency
The 4th capacitance C4.First connecting pin of the first end connecting detection coil 201 of the 4th capacitance C4, the 4th capacitance C4
Second end connect the first end of the third capacitance C3.
The earth-fault protection can also include：Power module 3.Power module 3 may include full-bridge rectification electricity
Road 801, the first RC circuits and the 2nd RC circuits.
Full bridge rectifier 801 may include：First diode D1, the second diode D2, third diode D3 and the 4th
Diode D4.The anode of the first diode D1 connects the cathode and center line of the second diode D2, the first diode D1
Cathode connect the 4th diode D4 cathode and the first RC circuits first end.The anode of the second diode D2 connects institute
State the anode and ground of third diode D3.The cathode of the third diode D3 connects the anode and phase of the 4th diode D4
Line.
The first RC circuits include：First resistor R1 and the first capacitance C1.The first end of the first resistor R1 connects
The first end of the first RC circuits.The second end of the first resistor R1 connects the first end of the first capacitance C1 and described
The second end of the power end VG, the first capacitance C1 of earth-fault protection breaker 5 are grounded.
The 2nd RC circuits include：5th resistance R5 and the 5th capacitance C5.Described in the first end connection of 5th resistance R5
The first end of first RC circuits.The second end of the 5th resistance R5 connects the first end of the 5th capacitance C5, and suitable for carrying
For the supply voltage VS needed for the detection circuit.The second end of the 5th capacitance C5 is grounded.
The earth-fault protection can also include：Dropout module 4.The dropout module 4 may include：It is silicon-controlled
Q1, the 5th diode D5, tripping coil 401 and the first contact switch K1 and the second contact switch K2.
The TRIG pins of the control pole connection earth-fault protection breaker 5 of the silicon-controlled Q1, control is disconnected for receiving
Signal processed.The anode of the silicon-controlled Q1 connects the cathode of the 5th diode D5, the minus earth of the silicon-controlled Q1.Described
The first end of the anode connection tripping coil 401 of five diode D5, the second end of the tripping coil 401 connect phase line.First
Contact switch K1 is arranged in phase line, and the second contact switch K2 is arranged on center line.The first contact switch K1 is suitable in institute
When stating the energization of tripping coil 401, the connection of phase line and load is disconnected.The second contact switch K2 is suitable in the tripping coil
When 401 energization, the connection of center line and load is disconnected.
The control pole of the silicon-controlled Q1 can also connect earth-fault protection breaker 5 by the second filter circuit
TRIG pins.Second filter circuit includes the 6th resistance R6 and the 6th capacitance C6.The first end of the 6th resistance R6 connects
The TRIG pins of earth-fault protection breaker 5 are connect, the second end of the 6th resistance R6 connects the first end of the 6th capacitance C6
With the control pole of silicon-controlled Q1.The second end of 6th capacitance C6 is grounded.
The earth-fault protection breaker 5 can be in the voltage of the power end VG of the earth-fault protection breaker 5
When less than or equal to supply voltage reset threshold, resetted.It is described to connect when the earth-fault protection breaker 5 resets
Failure delay counter inside earth fault protective breaker 5 is reset.The failure delay counter is for calculating residual current
Or the duration T 1 of mutual inducing current.The leakage current of the phase line that the residual current is well known to those skilled in the art over the ground.
When the voltage of power end VG is more than power reset threshold voltage, resets and decontrol.It resets after decontroling, the earth-fault protection open circuit
Device 5 can calculate the residual current received or mutual inductance current duration T1, when result of calculation is more than fault actions delay Tth
When, it is exported by TRIG pins and disconnects control signal.Fault actions delay Tth is earth-fault protection breaker 5 just
Often when work, it is found that failure occurred up to the time for sending out disconnection control signal.Mutual inductance current duration Tth is generally ability
Time known to field technique personnel.
As shown in Fig. 2, the test signal TST of the present embodiment may include：The of the corresponding AC signal positive half period
The second pulse signal M2 of one pulse signal M1 and the corresponding AC signal negative half-cycle.First pulse signal M1 it is lasting when
Between T11 be less than fault actions and be delayed Tth, the duration T 12 of the second pulse signal M2 is delayed Tth again smaller than fault actions.And
And first pulse signal M1 duration T 11 and the sum of the duration T 12 of the second pulse signal M2 prolong more than fault actions
When Tth.
First pulse signal M1 and the second pulse signal M2 makes current transformer 101 and detection coil 201 generate mutual inductance, when
When current transformer module 1, detection coil module 2 and earth-fault protection breaker 5 do not break down, current transformer module
The 1 mutual inducing current of output.So mutual inductance current duration T1 is equal to the duration T 11 and the second arteries and veins of the first pulse signal M1
Rush the sum of the duration T 12 of signal M2.
When the second diode D2 or the 4th diode D4 failures, that is, when opening a way, in the positive half period of AC signal,
Full bridge rectifier 801 can not provide supply voltage for the power end VG of earth-fault protection breaker 5, can only rely on the first electricity
Hold the charge stored on C1 and provides supply voltage for the power end VG of earth-fault protection breaker 5.Signal generator module 71 exists
The positive half period of AC signal produces the first pulse signal M1 so that earth-fault protection breaker 5 and current transformer mould
Block 1 and detection coil module 2 form regenerative feedback loop so that 5 inside of earth-fault protection breaker forms self-oscillation, described
The OSC pin outputting oscillation signals of earth-fault protection breaker 5.Since earth-fault protection breaker 5 maintains self-oscillation
Larger electric current is needed, therefore the voltage of power end VG drops quickly to supply voltage reset threshold, this makes earth fault protect
Failure delay counter inside shield breaker 5 is reset.
In the negative half-cycle of AC signal, full bridge rectifier 801 restores the power supply to earth fault protective breaker 5
Hold the power supply of VG.But since earth-fault protection breaker 5 resets and has been carried out clearly to the failure delay counter of its inside
Zero, it resets earth fault protective breaker 5 after decontroling and only calculates the corresponding mutual inductance current durations of the second pulse signal M2, and
The corresponding mutual inductance current durations of second pulse signal M2 are less than fault actions delay Tth.Therefore, earth-fault protection open circuit
Device will not export disconnection control signal.
The case where first diode D1 or third diode D3 break down, with above-mentioned second diode D2 or the four or two pole
The case where pipe D4 breaks down is similar.Only in the positive half period of AC signal, there is mutual inductance corresponding with the first pulse signal M1
Electric current input grounding error protection breaker 5.And in the negative half-cycle of AC signal, due to the first diode D1 or the three or two
Pole pipe D3, which breaks down, causes the voltage rapid decrease of power end VG so that earth-fault protection breaker 5 resets and in it
The failure delay counter in portion is reset.It resets the mutual inductance current duration after decontroling and is obviously smaller than fault actions delay
Tth.Therefore, earth-fault protection breaker will not export disconnection control signal.
The present embodiment is can be seen that from the course of work above not only to may be implemented to earth fault protective breaker 5, electricity
The fault detect of current transformer module 1 and detection coil module 2 can also realize the fault detect to power module 3.
It continues to refer to figure 1, signal generator module 71 may include：Zero passage detection module 701 and signal generator 702.It crosses
Zero detection module 701 can export zero-crossing pulse signal CZ when detecting zero crossing of the phase line relative to center line.Signal
Generator 702 generates at least one pulse signal after receiving zero-crossing pulse signal CZ.
The zero passage detection module 701 can connect the anode of silicon-controlled Q1 by playing the 7th resistance R7 of metering function.
5th diode D5 is connected in the positive half period of AC signal.At this point, signal in phase line can by tripping coil 401, lead
Logical the 5th diode D5 and the 7th resistance R7 flows into zero passage detection module 701, the letter that zero passage detection module 701 passes through the inflow
Number obtain zero crossing of the phase line relative to center line.
The detection circuit further includes：Judging module 72.After judging module 72 receives zero-crossing pulse signal CZ, in the friendship
In the negative half-cycle for flowing signal, probe current is exported by its detective pin IS, to judge the earth-fault protection breaker 5
Whether output disconnects control signal.
Optionally, judging module 72 obtains the load resistance state of detective pin IS by the probe current, and according to
Whether the load resistance condition adjudgement earth-fault protection breaker 5 of detective pin IS exports the disconnection control signal.
Specifically, the cathode of the 5th diode D5 of detective pin IS connections of judging module 72, naturally it is also possible to pass through
The cathode of the 5th diode D5 of six diode D6 connections.
When earth-fault protection does not break down, earth-fault protection breaker 5 exists according to test signal TST
The output of TRIG pins disconnects control signal, silicon-controlled Q1 conductings.Judging module 72 is being handed over after receiving zero-crossing pulse signal CZ
It flows in the negative half-cycle of signal and exports probe current from detective pin IS, the voltage of detective pin IS is high level at this time.Conducting
Silicon-controlled Q1 make the load resistance of detective pin IS become low resistive state from high-impedance state, so, detective pin IS is by height
Level is pulled low to low level, forms a pulse.
When earth-fault protection breaks down, earth-fault protection breaker 5 is according to test signal TST in TRIG
Pin does not export disconnection control signal, silicon-controlled Q1 cut-offs.Judging module 72 is exchanging after receiving zero-crossing pulse signal CZ
Probe current is exported from detective pin IS in the negative half-cycle of signal, the voltage of detective pin IS is high level at this time.Cut-off
Silicon-controlled Q1 makes the load resistance of detective pin IS be maintained at high-impedance state, so, the voltage of detective pin IS is also maintained at
High level.
It can thus be seen that the voltage by detecting detective pin IS, it may be determined that the load resistance shape of detective pin IS
State, to judge whether earth-fault protection breaks down.
With continued reference to Fig. 2, it is worth noting that, it is happened at friendship after the disconnection control signal generated according to test signal TST
In the negative half-cycle for flowing signal.Silicon-controlled Q1 is set to be connected although disconnecting control signal, the phases line voltage in negative half-cycle is less than
Neutral voltage so that the 5th diode D5 is in by state.So dduring test, it, will not even if silicon-controlled Q1 is connected
Make to generate electric current on tripping coil 401, the first contact switch K1 and the second contact switch K2 not will disconnect load, to realize
In the case where not turning off load, the test of earth-fault protection is carried out.
The detection circuit can also include：Alarm module 73.Described in alarm module 73 is determined in the judging module 72
When earth-fault protection breaker 5 does not export the disconnection control signal, alarm is carried out.
Specifically, the alarm module 73 may include：LED drive module and LED lamp module.Judging module 72 determines institute
When stating earth-fault protection breaker 5 and not exporting disconnection control signal, LED can be given to drive mould with output alarm signal FAIL
Block.After LED drive module receives alarm signal FAIL, output frequency square-wave signal drives LED light mould to LED lamp module
Block sends out the visualization alarm signal of flicker.The square-wave signal can be 3Hz.
As shown in Figure 1, the detection circuit can also include：Controllable switch SW and signal transmssion line 601.
The control terminal of controllable switch SW is suitable for receiving the test signal TST, the first connecting pin connection of controllable switch SW
First tie point of the signal transmssion line 601, the second connection end ground connection of controllable switch SW.The second of signal transmssion line 601
Tie point connects the second connection end of controllable switch SW.Signal transmssion line between first tie point and the second tie point
601 run through current transformer 101 and detection coil 201.Controllable switch SW is led during the pulse signal of test signal TST occurs
It is logical, it is closed so that being formed with controllable switch SW across current transformer 101 and the signal transmssion line 601 of detection coil 201
Circuit.
Optionally, signal transmssion line 601 can be multiplexed center line, you can the first connecting pin of control switch SW and second connection end
Two tie points of center line are connected, the center line between two tie points of the center line runs through current transformer 101 and detection line
Circle 201.NMOS tube with switching characteristic, NPN triode or the semiconductor devices such as silicon-controlled may be used in the controllable switch SW
Part, conducting resistance are less than or equal to 10 Ω.
Although present disclosure is as above, present invention is not limited to this.Any those skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (16)
1. a kind of ground-fault protection system, which is characterized in that including：Earth-fault protection and detection circuit；
The earth-fault protection includes：Current transformer module, detection coil module and earth-fault protection breaker,
The earth-fault protection breaker connects the current transformer module and the detection coil module；
The current transformer module includes：Current transformer；The detection coil module includes：Detection coil；Phase line is in
Line provides AC signal, and the phase line and center line run through the current transformer and the detection coil；
The current transformer module is suitable for forming mutual inductance in the current transformer and the detection coil, and is connect with described
When earth fault protective breaker forms current path, mutual inducing current is exported to the earth-fault protection breaker；
The earth-fault protection breaker is suitable for disconnecting the phase line, center line and the company of load according to the mutual inducing current output
The disconnection control signal connect；
The detection circuit includes：Signal generator module；
The signal generator module is suitable for output test signal；In a cycle of the AC signal, the test signal
With at least one pulse signal, the pulse signal makes the current transformer and the detection coil generate mutual inductance.
2. ground-fault protection system as described in claim 1, which is characterized in that
The earth-fault protection breaker, when resetting the residual current received after relieving or lasting mutual inducing current suitable for calculating
Between, when result of calculation is more than fault actions and is delayed, exports the disconnection and control signal.
3. ground-fault protection system as claimed in claim 2, which is characterized in that at least one pulse signal adds up
Duration is delayed more than the fault actions；
At least one pulse signal includes：The pulse signal of the correspondence AC signal positive half period, and described in correspondence
The pulse signal of AC signal negative half-cycle；
The aggregated duration of the pulse signal of the corresponding AC signal positive half period is delayed less than the fault actions；
The aggregated duration of the pulse signal of the corresponding AC signal negative half-cycle is delayed less than the fault actions.
4. ground-fault protection system as claimed in claim 2, which is characterized in that the earth-fault protection also wraps
It includes：Power module；
The power module, be suitable for the power module under normal circumstances, provide more than or equal to supply voltage reset threshold
The first supply voltage to the earth-fault protection breaker power end；It breaks down in the power module,
The electricity for being less than or equal to the second source voltage of the supply voltage reset threshold to the earth-fault protection breaker is provided
Source；
The earth-fault protection breaker, suitable for receiving described second in the power end of the earth-fault protection breaker
When supply voltage, resetted.
5. ground-fault protection system as claimed in claim 2, which is characterized in that the earth-fault protection also wraps
It includes：Power module；
The power module includes：Full bridge rectifier and the first RC circuits；
The first input end of the full bridge rectifier connects the phase line, the second input terminal connection of the full bridge rectifier
The center line, the first output end of the full bridge rectifier connect the first end of the first RC circuits, the full-bridge rectification
The second output terminal of circuit is grounded；
The first RC circuits include：The first end of first resistor and the first capacitance, the first resistor connects the first RC
The second end of the first end of circuit, the first resistor connects the first end of first capacitance and the earth-fault protection is broken
The power end of road device, the second end ground connection of first capacitance；
The earth-fault protection breaker, the voltage suitable for the power end in the earth-fault protection breaker are less than or wait
When supply voltage reset threshold, resetted.
6. ground-fault protection system as claimed in claim 5, which is characterized in that the full bridge rectifier includes：First
Diode, the second diode, third diode and the 4th diode；
The anode of first diode connects the second input terminal of the cathode and the full bridge rectifier of the second diode, institute
State the first output end of the cathode and the full bridge rectifier of cathode the 4th diode of connection of the first diode；
The anode of second diode connects the second output of the anode and the full bridge rectifier of the third diode
End；
The cathode of the third diode connects the first input of the anode and the full bridge rectifier of the 4th diode
End.
7. ground-fault protection system as described in claim 1, which is characterized in that the earth-fault protection also wraps
It includes：Dropout module；
The dropout module includes：Silicon-controlled, the 5th diode, tripping coil and contact switch；
The silicon-controlled control pole is suitable for receiving the disconnection and controls signal, and the silicon-controlled anode connects the 5th diode
Cathode, the silicon-controlled minus earth；
The first end of the anode connection tripping coil of 5th diode；
The second end of the tripping coil connects the phase line；
The contact switch is arranged in phase line and center line, and the contact switch is suitable for disconnecting institute when the tripping coil is powered
State the connection of phase line and center line and load.
8. ground-fault protection system as described in claim 1, which is characterized in that the detection circuit further includes：Adjudicate mould
Block；
The judging module controls signal suitable for judging whether the earth-fault protection breaker outputs the disconnection.
9. ground-fault protection system as claimed in claim 8, which is characterized in that the judging module is suitable in the friendship
It flows and exports probe current in the negative half-cycle of signal, controlled with judging whether the earth-fault protection breaker exports the disconnection
Signal processed.
10. ground-fault protection system as claimed in claim 9, which is characterized in that the earth-fault protection also wraps
It includes：Dropout module；
The dropout module includes：Silicon-controlled, the 5th diode, tripping coil and contact switch
The silicon-controlled control pole is suitable for receiving the disconnection and controls signal, and the silicon-controlled anode connects the 5th diode
Cathode and detective pin, the silicon-controlled minus earth；
The first end of the anode connection tripping coil of 5th diode；
The second end of the tripping coil connects the phase line；
The contact switch is arranged in phase line and center line, and the contact switch is suitable for disconnecting institute when the tripping coil is powered
State the connection of phase line and center line and load；
The detective pin is suitable for receiving the probe current.
11. ground-fault protection system as claimed in claim 10, which is characterized in that the judging module, suitable for passing through
The load resistance state that probe current obtains the detective pin is stated, and according to the load resistance condition adjudgement of the detective pin
Whether the earth-fault protection breaker exports the disconnection control signal.
12. ground-fault protection system as claimed in claim 8, which is characterized in that the detection circuit further includes：Alarm mould
Block；
The alarm module, suitable for determining that the earth-fault protection breaker does not export the disconnection control in the judging module
When signal processed, alarm is carried out.
13. ground-fault protection system as described in claim 1, which is characterized in that the signal generator module includes：Zero passage
Detection module and signal generator；
The zero passage detection module, suitable for when detecting zero crossing of the phase line relative to the center line, exporting zero passage arteries and veins
Rush signal；
The signal generator, suitable for after receiving the zero-crossing pulse signal, generating at least one pulse signal.
14. ground-fault protection system as claimed in claim 13, which is characterized in that the detection circuit further includes：Judgement
Module；
The judging module is suitable for output probe current, to judge it is described disconnected whether the earth-fault protection breaker exports
Open control signal.
15. ground-fault protection system as described in claim 1, which is characterized in that the detection circuit further includes：Controllably open
Pass and signal transmssion line；
The control terminal of the controllable switch is suitable for receiving the test signal, described in the first connecting pin connection of the controllable switch
First tie point of signal transmssion line, the second connection end ground connection of the controllable switch；
Second tie point of the signal transmssion line connects the second connection end of the controllable switch；
Signal transmssion line between first tie point and the second tie point runs through the current transformer and the detection line
Circle.
16. ground-fault protection system as claimed in claim 15, which is characterized in that during the signal transmssion line multiplexing is described
Line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/926,339 US10923899B2 (en) | 2017-03-21 | 2018-03-20 | Ground fault protection system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710170208 | 2017-03-21 | ||
| CN2017101702081 | 2017-03-21 |
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| CN108631263B CN108631263B (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810204668.6A Active CN108631263B (en) | 2017-03-21 | 2018-03-13 | Ground fault protection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474466A (en) * | 2019-01-23 | 2020-07-31 | 本德尔有限两合公司 | Circuit arrangement for detecting closed switch contacts and for protecting ground conductor against interruption in single-phase or polyphase supply lines |
| CN111474422A (en) * | 2019-01-24 | 2020-07-31 | 上海复旦微电子集团股份有限公司 | Ground fault protection system |
| CN111864694A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Residual current protection circuit |
| CN111864691A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
| CN115173362A (en) * | 2022-07-12 | 2022-10-11 | 无锡友达电子有限公司 | Leakage protection device with self-checking function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1437813A2 (en) * | 2003-01-09 | 2004-07-14 | Goodrich Corporation | Apparatus for and method of ground fault detection |
| CN201219092Y (en) * | 2008-06-02 | 2009-04-08 | 比亚迪股份有限公司 | Ground fault interrupter |
| CN101983465A (en) * | 2008-03-27 | 2011-03-02 | 西门子工业公司 | Device, system and method for automatic self-test for a ground fault interrupter |
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN102315621A (en) * | 2010-07-06 | 2012-01-11 | 益而益(集团)有限公司 | Electric wire connection protecting device with self-checking function |
-
2018
- 2018-03-13 CN CN201810204668.6A patent/CN108631263B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1437813A2 (en) * | 2003-01-09 | 2004-07-14 | Goodrich Corporation | Apparatus for and method of ground fault detection |
| CN101983465A (en) * | 2008-03-27 | 2011-03-02 | 西门子工业公司 | Device, system and method for automatic self-test for a ground fault interrupter |
| CN201219092Y (en) * | 2008-06-02 | 2009-04-08 | 比亚迪股份有限公司 | Ground fault interrupter |
| CN102315621A (en) * | 2010-07-06 | 2012-01-11 | 益而益(集团)有限公司 | Electric wire connection protecting device with self-checking function |
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474466A (en) * | 2019-01-23 | 2020-07-31 | 本德尔有限两合公司 | Circuit arrangement for detecting closed switch contacts and for protecting ground conductor against interruption in single-phase or polyphase supply lines |
| CN111474466B (en) * | 2019-01-23 | 2022-12-30 | 本德尔有限两合公司 | Circuit arrangement and method for detecting closed switch contacts and for protecting ground conductors against interruption |
| CN111474422A (en) * | 2019-01-24 | 2020-07-31 | 上海复旦微电子集团股份有限公司 | Ground fault protection system |
| CN111864694A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Residual current protection circuit |
| CN111864691A (en) * | 2019-04-30 | 2020-10-30 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
| CN111864694B (en) * | 2019-04-30 | 2022-09-27 | 上海复旦微电子集团股份有限公司 | Residual current protection circuit |
| US11705717B2 (en) | 2019-04-30 | 2023-07-18 | Shanghai Fudan Microelectronics Group Company Limited | Ground fault circuit interrupter |
| CN115173362A (en) * | 2022-07-12 | 2022-10-11 | 无锡友达电子有限公司 | Leakage protection device with self-checking function |
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