CN105490246B - A kind of alternating electrical polarity correction earth leakage protective device and control method - Google Patents
A kind of alternating electrical polarity correction earth leakage protective device and control method Download PDFInfo
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- CN105490246B CN105490246B CN201510980467.1A CN201510980467A CN105490246B CN 105490246 B CN105490246 B CN 105490246B CN 201510980467 A CN201510980467 A CN 201510980467A CN 105490246 B CN105490246 B CN 105490246B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—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 involving voltage comparison
-
- 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
- H02H3/14—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 occurrence of voltage on parts normally at earth potential
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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Abstract
The invention discloses a kind of alternating electrical polarity correction earth leakage protective device and control method, including correcting drive circuit, leakage protection circuit, microprocessor, it is grounded input, zero line input, live wire input, it is grounded output end, zero line output end and fire wire output end, correction drive circuit is connected with switching relay and data processing circuit, data processing circuit is connected with voltage amplifier circuit, reference voltage generating circuit and status data output circuit, voltage amplifier circuit is connected with decay detection circuit, decay detection circuit is connected with zero line input, status data output circuit is connected with microprocessor；Leakage protection circuit is connected with microprocessor and is connected with the first protective relay and the second protective relay; microprocessor is connected with electric leakage processor and photo-coupler; electric leakage processor is connected with creepage mutual inductor, and photo-coupler is connected with ground connection output end and zero line output end respectively.
Description
Technical field
The present invention relates to a kind of earth leakage protective device and control method, particularly a kind of alternating electrical polarity correction earth leakage protective
Device and control method.
Background technology
Electric equipment earth leakage protective mainly detects whether electrical equipment leaks electricity using the mode of transformer at present, and this mode exists
It can effectively realize creepage protection function under the premise of ground wire of electrical appliance ground connection is reliable, but if during electric equipment unearthed line, this
Kind detection mode, which will fail, can not play creepage protection function；The alternating electrical polarity automatic straightening of electric equipment is frequently with ground wire
Without identification correction conversion, but in the case of no ground line, alternating electrical polarity automatic straightening can not be realized, another
Method is to carry out ADC digital conversion using sensing phases line voltage to realize polarity automatic straightening, but its reliability and stability is poor.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of alternating electrical polarity correction earth leakage protective device and control
Method processed.
Technical scheme is used by the present invention solves its problem：A kind of alternating electrical polarity corrects earth leakage protective device, bag
Include for polarity correction correction drive circuit, for earth leakage protective leakage protection circuit, microprocessor, ground connection input,
Zero line input, live wire input, ground connection output end, zero line output end and fire wire output end, the correction drive circuit connection
There are the switching relay and data processing circuit for controlling K3, K4, K5, K6, the data processing circuit is connected with voltage and put
Big circuit, reference voltage generating circuit and status data output circuit, the voltage amplifier circuit are connected with decay detection circuit,
The decay detection circuit is connected with zero line input, and the status data output circuit is connected with microprocessor；The electric leakage
Protection circuit is connected with microprocessor and is connected with the first protective relay for controlling K1, K2 and for controlling K7, K8
The second protective relay, the microprocessor is connected with electric leakage processor and photo-coupler, and the electric leakage processor is connected with
Creepage mutual inductor, the photo-coupler are connected with ground connection output end and zero line output end respectively.
The achievable polarity automatic straightening of the present invention, overtemperature protection, earth wire charged protecting, unearthed line earth leakage protective, ground connection
The functions such as line earth leakage protective, so as to realize effectively protection to electric equipment, the service life of electric equipment is substantially increased, is improved
The usage safety performance of electric equipment, person electric shock, the accident of economic asset loss is effectively avoided to occur.
Further, the reference voltage generating circuit includes the first constant-current source, the second constant-current source, the 3rd constant-current source, first
Triode, the second triode, the 3rd triode, first resistor, second resistance, 3rd resistor, the first NMOS tube, the 2nd NMOS
Pipe；Wherein, the first constant-current source, the second constant-current source, the input of the 3rd constant-current source are connected with power vd D respectively；First constant-current source
Output end be connected respectively with the colelctor electrode of the first triode and the grid of the first metal-oxide-semiconductor；The output end difference of second constant-current source
It is connected with the colelctor electrode of the second triode and the grid of the second metal-oxide-semiconductor；The hair of the emitter stage of first triode and the second triode
Drain electrode of the emitter-base bandgap grading respectively with the first metal-oxide-semiconductor is connected；The source ground of first metal-oxide-semiconductor；The source ground of second metal-oxide-semiconductor；Three or three
The grounded emitter of pole pipe, the base stage of the 3rd triode, colelctor electrode are connected with the second end of first resistor respectively；First resistor
First end, the second end of second resistance are connected with the base stage of the second triode；The first end of second resistance, the second of 3rd resistor
End is connected with the base stage of the first triode；The drain electrode of the first end of 3rd resistor, the output end of the 3rd constant-current source and the second metal-oxide-semiconductor
It is connected to form the output end of the voltage of band-gap reference.
Reference voltage subtracts transmitting for the base voltage of negative temperature coefficient caused by the reference voltage generating circuit of the present invention
The voltage sum of the difference and a positive temperature coefficient of pole tension, caused reference voltage is set hardly to be influenced by temperature, it is stable
Property it is high, and eliminate arithmetic unit amplifier, avoid and imbalance is inputted caused by amplifier Differential Input mismatch, there is height
Precision, low-power consumption, it is simple in construction, practical the characteristics of.
Further, including the first temperature sensor and second temperature sensor, first temperature sensor is respectively with turning
Change relay to connect with microprocessor, the second temperature sensor is connected with the second protective relay and microprocessor respectively.
Further, the first temperature sensor and second temperature sensor include protection shell, thermistor, epoxy resin,
Wire rod, heat-shrinkable T bush, binding post and connector, the protection shell is the monoblock type copper shell of plating nickel on surface, outside the protection
Thermistor is provided with shell, described wire rod one end is installed with heat-shrinkable T bush and is connected with the thermistor, and the wire rod is another
End is connected with the binding post, and the binding post is connected with the connector.This design tool of temperature sensor
There are simple in construction, excellent, the moistureproof moisture-proof of insulation, safe and reliable, efficiency high, energy consumption is low, reaction is fast, steady temperature fluctuation is small, anti-
The features such as interference performance is strong, service life is long.
Further, second protective relay is monopole type relay or ambipolar relay.
Further, including display module, the display module are connected with microprocessor.
Further, including decompression voltage regulator, the decompression voltage regulator respectively with zero line input and live wire input
Connection.
Further, diode and resistance are connected with turn between the photo-coupler and zero line output end.
A kind of control method of alternating electrical polarity correction earth leakage protective device, comprises the following steps：
S10, start；
S20, if power-off, is to go to step S60, no to go to step S30；
S30, polarity automatic straightening；
S40, earth leakage protective, go to step S20;
S50, temperature protection;
S60, terminate.
Further, step S30 comprises the following steps：
S31, detect input voltage value；
S32, magnitude of voltage enhanced processing；
S33, produce benchmark comparison voltage and with detection voltage ratio compared with；
S34, according to voltage comparative result, correction drive circuit is adjusted, and goes to step S41；
Further, step S40 comprises the following steps：
Whether S41, ground wire correctly connect, and are to go to step S43, no to go to step S42；
S42, the cut-out ground wire connection of the first protective relay, the cut-out live wire connection of the second protective relay, go to step S48；
Whether S43, creepage mutual inductor sense electric leakage signal, are to go to step S44, no to go to step S51；
S44, the cut-out live wire connection of the second protective relay；
S45, time delay T；
S46, the second protective relay connect live wire connection；
S47, display module shows corresponding information and sends alarm signal, goes to step S51；
S48, display module shows corresponding information and sends alarm signal, goes to step S60.
Further, step S50 comprises the following steps：
Whether S51, switching relay are more than the maximum temperature of setting, are to go to step S48, no to go to step S52;
Whether S52, the second protective relay are more than the maximum temperature of setting, are to go to step S48, no to go to step S20.
The beneficial effects of the invention are as follows：A kind of alternating electrical polarity correction earth leakage protective device and controlling party that the present invention uses
Method, including corrected for polarity correction drive circuit, for earth leakage protective leakage protection circuit, microprocessor, ground connection it is defeated
Enter end, zero line input, live wire input, ground connection output end, zero line output end and fire wire output end, the correction drive circuit
The switching relay and data processing circuit for controlling K3, K4, K5, K6 are connected with, the data processing circuit is connected with electricity
Amplifying circuit, reference voltage generating circuit and status data output circuit are pressed, the voltage amplifier circuit is connected with decay detection
Circuit, the decay detection circuit are connected with zero line input, and the status data output circuit is connected with microprocessor；It is described
Leakage protection circuit is connected with microprocessor and is connected with the first protective relay for controlling K1, K2 and for controlling
K7, K8 the second protective relay, the microprocessor are connected with electric leakage processor and photo-coupler, and the electric leakage processor connects
Creepage mutual inductor is connected to, the photo-coupler is connected with ground connection output end and zero line output end respectively.The achievable polarity of the present invention
The functions such as automatic straightening, overtemperature protection, earth wire charged protecting, unearthed line earth leakage protective, ground wire earth leakage protective, so as to electricity
Device equipment realizes effectively protection, substantially increases the service life of electric equipment, improves the usage safety performance of electric equipment, have
Effect avoids person electric shock, the accident of economic asset loss from occurring.
Brief description of the drawings
The invention will be further described with example below in conjunction with the accompanying drawings.
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the structure chart of inventive sensor；
Fig. 3 is the control method flow chart of the present invention.
Embodiment
Reference picture 1- Fig. 2, a kind of alternating electrical polarity of the invention correction earth leakage protective device, including corrected for polarity
Correction drive circuit 1, for earth leakage protective leakage protection circuit 2, microprocessor 3, ground connection input 4, zero line input
5th, live wire input 6, ground connection output end 7, zero line output end 8 and fire wire output end 9, the correction drive circuit 1 are connected with use
In control K3, K4, K5, K6 switching relay 10 and data processing circuit 11, the data processing circuit 11 is connected with voltage
Amplifying circuit 12, reference voltage generating circuit 13 and status data output circuit 14, the voltage amplifier circuit 12, which is connected with, to decline
Subtract detection circuit 31, the decay detection circuit 31 is connected with zero line input 5, the status data output circuit 14 and Wei Chu
Reason device 3 connects；The leakage protection circuit 2 be connected with microprocessor 3 and be connected with for control K1, K2 first protect after
Electrical equipment 15 and the second protective relay 16 for controlling K7, K8, the microprocessor 3 are connected with electric leakage processor 17 and optocoupler
Clutch 18, the electric leakage processor 17 are connected with creepage mutual inductor 19, and the photo-coupler 18 is respectively with being grounded output end 7 and zero
Line output terminal 8 connects.
The achievable polarity automatic straightening of the present invention, overtemperature protection, earth wire charged protecting, unearthed line earth leakage protective, ground connection
The functions such as line earth leakage protective, so as to realize effectively protection to electric equipment, the service life of electric equipment is substantially increased, is improved
The usage safety performance of electric equipment, person electric shock, the accident of economic asset loss is effectively avoided to occur.
Preferably, the reference voltage generating circuit 13 includes the first constant-current source, the second constant-current source, the 3rd constant-current source, the
One triode, the second triode, the 3rd triode, first resistor, second resistance, 3rd resistor, the first NMOS tube, the 2nd NMOS
Pipe；Wherein, the first constant-current source, the second constant-current source, the input of the 3rd constant-current source are connected with power vd D respectively；First constant-current source
Output end be connected respectively with the colelctor electrode of the first triode and the grid of the first metal-oxide-semiconductor；The output end difference of second constant-current source
It is connected with the colelctor electrode of the second triode and the grid of the second metal-oxide-semiconductor；The hair of the emitter stage of first triode and the second triode
Drain electrode of the emitter-base bandgap grading respectively with the first metal-oxide-semiconductor is connected；The source ground of first metal-oxide-semiconductor；The source ground of second metal-oxide-semiconductor；Three or three
The grounded emitter of pole pipe, the base stage of the 3rd triode, colelctor electrode are connected with the second end of first resistor respectively；First resistor
First end, the second end of second resistance are connected with the base stage of the second triode；The first end of second resistance, the second of 3rd resistor
End is connected with the base stage of the first triode；The drain electrode of the first end of 3rd resistor, the output end of the 3rd constant-current source and the second metal-oxide-semiconductor
It is connected to form the output end of the voltage of band-gap reference.
Reference voltage subtracts hair for the base voltage of negative temperature coefficient caused by the reference voltage generating circuit 13 of the present invention
The voltage sum of the difference and a positive temperature coefficient of emitter voltage, caused reference voltage is set hardly to be influenced by temperature, surely
Qualitative height, and arithmetic unit amplifier is eliminated, avoid and imbalance is inputted caused by amplifier Differential Input mismatch, have
High accuracy, low-power consumption, it is simple in construction, practical the characteristics of.
Preferably, including the first temperature sensor 20 and second temperature sensor 21, first temperature sensor 20 divide
Be not connected with switching relay 10 and microprocessor 3, the second temperature sensor 21 respectively with the second protective relay 16 and
Microprocessor 3 connects.
Preferably, the first temperature sensor 20 and second temperature sensor 21 include protection shell 22, thermistor 23, ring
Oxygen tree fat 24, wire rod 25, heat-shrinkable T bush 26, binding post 27 and connector 28, the protection shell 22 are the whole of plating nickel on surface
Body formula copper shell, be provided with thermistor 23 in the protection shell 22, described one end of wire rod 25 be installed with heat-shrinkable T bush 26 and with it is described
Thermistor 23 is connected, and the other end of wire rod 25 is connected with the binding post 27, the binding post 27 with it is described
Connector 28 is connected.This design of temperature sensor has simple in construction, excellent, the moistureproof moisture-proof of insulation, safe and reliable, effect
The features such as rate is high, energy consumption is low, reaction is fast, steady temperature fluctuation is small, strong antijamming capability, long service life.
Preferably, second protective relay 16 is monopole type relay or ambipolar relay.
Preferably, including display module 29, the display module 29 are connected with microprocessor 3.
Preferably, including decompression voltage regulator 30, the decompression voltage regulator 30 are defeated with zero line input 5 and live wire respectively
Enter the connection of end 6.
Preferably, diode and resistance are connected with turn between the photo-coupler 18 and zero line output end 8.
A kind of reference picture 3, control method of alternating electrical polarity correction earth leakage protective device, comprises the following steps：
S10, start；
S20, if power-off, is to go to step S60, no to go to step S30；
S30, polarity automatic straightening；
S40, earth leakage protective, go to step S20;
S50, temperature protection;
S60, terminate.
Preferably, step S30 comprises the following steps：
S31, detect input voltage value；
S32, magnitude of voltage enhanced processing；
S33, produce benchmark comparison voltage and with detection voltage ratio compared with；
S34, according to voltage comparative result, correction drive circuit 1 is adjusted, and goes to step S41；
Preferably, step S40 comprises the following steps：
Whether S41, ground wire correctly connect, and are to go to step S43, no to go to step S42；
S42, the cut-out ground wire connection of the first protective relay 15, the cut-out live wire connection of the second protective relay 16, go to step
S48；
Whether S43, creepage mutual inductor 19 sense electric leakage signal, are to go to step S44, no to go to step S51；
S44, the cut-out live wire connection of the second protective relay 16；
S45, time delay T；
S46, the second protective relay 16 connect live wire connection；
S47, display module 29 shows corresponding information and sends alarm signal, goes to step S51；
S48, display module 29 shows corresponding information and sends alarm signal, goes to step S60.
Further, step S50 comprises the following steps：
Whether S51, switching relay 10 are more than the maximum temperature of setting, are to go to step S48, no to go to step S52;
Whether S52, the second protective relay 16 are more than the maximum temperature of setting, are to go to step S48, no to go to step S20.
The course of work of the present invention：If the alternating electrical polarity of input is correct, switching relay 10 will keep K4, and K6 ends are defeated
Go out correct polarity, if the alternating electrical polarity mistake of input, switching relay 10 will jump to K3, K5 and keep output, so as to
Ensure that alternating electrical polarity is correct；Normal ground and ground wire it is not charged in the case of, when leaking electricity creepage mutual inductor 19 will feel
The electric signal answered is sent to electric leakage processor 17 and is then sent through microprocessor 3, and the second protective relay 16 cut-out live wire connects, simultaneously
Microprocessor 3 drives display unit to show corresponding information and send alarm signal；Do not connect in input grounding tape electricity and ground wire
In the case of, ground wire will form loop with output zero line side through photo-coupler 18, diode and resistance and produce pressure drop driving optocoupler
Clutch 18 exports electric shock signal and is sent to microprocessor 3, the cut-out ground wire connection of the first protective relay 15, the second protection relay
Device 16 cuts off live wire connection；Switching relay 10 is connected with the first temperature sensor 20, and the second protective relay 16 is connected with
Two temperature sensors 21, and the first temperature sensor 20 and second temperature sensor 21 are connected respectively to microprocessor 3, work as detection
When being more than the maximum temperature of setting to the operating temperature of the second protective relay 16 and switching relay 10, the second protective relay
16 will cut off the output of alternating current.
It is described above, simply presently preferred embodiments of the present invention, the invention is not limited in above-mentioned embodiment, as long as
It reaches the technique effect of the present invention with identical means, should all belong to protection scope of the present invention.
Claims (9)
1. a kind of alternating electrical polarity corrects earth leakage protective device, it is characterised in that：Correction including being corrected for polarity drives electricity
Road (1), for earth leakage protective leakage protection circuit (2), microprocessor (3), ground connection input (4), zero line input (5),
Live wire input (6), ground connection output end (7), zero line output end (8) and fire wire output end (9), the correction drive circuit (1)
It is connected with the switching relay (10) and data processing circuit (11) for controlling K3, K4, K5, K6, the data processing circuit
(11) voltage amplifier circuit (12), reference voltage generating circuit (13) and status data output circuit (14), the electricity are connected with
Pressure amplifying circuit (12) is connected with decay detection circuit (31), and the decay detection circuit (31) is connected with zero line input (5),
The status data output circuit (14) is connected with microprocessor (3)；The leakage protection circuit (2) connects with microprocessor (3)
Connect and be connected with the first protective relay (15) for controlling K1, K2 and the second protective relay for controlling K7, K8
(16), the microprocessor (3) is connected with electric leakage processor (17) and photo-coupler (18), electric leakage processor (17) connection
There is creepage mutual inductor (19), the photo-coupler (18) is connected with ground connection output end (7) and zero line output end (8) respectively；Including
Display module (29), the display module (29) are connected with microprocessor (3)；Including decompression voltage regulator (30), the decompression
Mu balanced circuit (30) is connected with zero line input (5) and live wire input (6) respectively.
A kind of 2. alternating electrical polarity correction earth leakage protective device according to claim 1, it is characterised in that：The benchmark electricity
Generation circuit (13) is pressed to include the first constant-current source, the second constant-current source, the 3rd constant-current source, the first triode, the second triode, the 3rd
Triode, first resistor, second resistance, 3rd resistor, the first NMOS tube, the second NMOS tube；Wherein, the first constant-current source, second
Constant-current source, the input of the 3rd constant-current source are connected with power vd D respectively；The output end of first constant-current source respectively with the first triode
Colelctor electrode and the first metal-oxide-semiconductor grid connection；The output end of second constant-current source respectively with the colelctor electrode of the second triode and
The grid connection of two metal-oxide-semiconductors；The drain electrode with the first metal-oxide-semiconductor respectively of the emitter stage of the emitter stage of first triode and the second triode
It is connected；The source ground of first metal-oxide-semiconductor；The source ground of second metal-oxide-semiconductor；The grounded emitter of 3rd triode, the three or three pole
The base stage of pipe, colelctor electrode are connected with the second end of first resistor respectively；The first end of first resistor, the second end of second resistance and
The base stage of second triode is connected；The first end of second resistance, the second end of 3rd resistor are connected with the base stage of the first triode；
The drain electrode of the first end of 3rd resistor, the output end of the 3rd constant-current source and the second metal-oxide-semiconductor is connected to form the voltage of band-gap reference
Output end.
A kind of 3. alternating electrical polarity correction earth leakage protective device according to claim 1, it is characterised in that：Including the first temperature
Spend sensor (20) and second temperature sensor (21), first temperature sensor (20) respectively with switching relay (10) and
Microprocessor (3) connects, and the second temperature sensor (21) connects with the second protective relay (16) and microprocessor (3) respectively
Connect.
A kind of 4. alternating electrical polarity correction earth leakage protective device according to claim 3, it is characterised in that：First temperature passes
Sensor (20) and second temperature sensor (21) include protection shell (22), thermistor (23), epoxy resin (24), wire rod
(25), heat-shrinkable T bush (26), binding post (27) and connector (28), the protection shell (22) are the monoblock type of plating nickel on surface
Copper shell, is provided with thermistor (23) in protection shell (22), described wire rod (25) one end be installed with heat-shrinkable T bush (26) and with
The thermistor (23) is connected, and wire rod (25) other end is connected with the binding post (27), the terminals
Sub (27) are connected with the connector (28).
A kind of 5. alternating electrical polarity correction earth leakage protective device according to claim 1, it is characterised in that：The optical coupling
Diode and resistance are connected with turn between device (18) and zero line output end (8).
6. a kind of control method applied to any described alternating electrical polarity correction earth leakage protective device of claim 1 to 5, its
It is characterised by, comprises the following steps：
S10, start；
S20, if power-off, is to go to step S60, no to go to step S30；
S30, polarity automatic straightening；
S40, earth leakage protective, go to step S20；
S50, temperature protection；
S60, terminate.
A kind of 7. control method of alternating electrical polarity correction earth leakage protective device according to claim 6, it is characterised in that
Step S30 comprises the following steps：
S31, detect input voltage value；
S32, magnitude of voltage enhanced processing；
S33, produce benchmark comparison voltage and with detection voltage ratio compared with；
S34, according to voltage comparative result, correction drive circuit (1) is adjusted, and goes to step S40.
A kind of 8. control method of alternating electrical polarity correction earth leakage protective device according to claim 6, it is characterised in that
Step S40 comprises the following steps：
Whether S41, ground wire correctly connect, and are to go to step S43, no to go to step S42；
S42, the first protective relay (15) cut-out ground wire connection, the second protective relay (16) cut-out live wire connection, go to step
S48；
Whether S43, creepage mutual inductor (19) sense electric leakage signal, are to go to step S44, no to go to step S50；
S44, the second protective relay (16) cut-out live wire connection；
S45, time delay T；
S46, the second protective relay (16) connect live wire connection；
S47, display module (29) shows corresponding information and sends alarm signal, goes to step S50；
S48, display module (29) shows corresponding information and sends alarm signal, goes to step S60.
A kind of 9. control method of alternating electrical polarity correction earth leakage protective device according to claim 8, it is characterised in that
Step S50 comprises the following steps：
Whether S51, switching relay (10) are more than the maximum temperature of setting, are to go to step S48, no to go to step S52；
Whether S52, the second protective relay (16) are more than the maximum temperature of setting, are to go to step S48, no to go to step S20.
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| CN201510980467.1A CN105490246B (en) | 2015-12-22 | 2015-12-22 | A kind of alternating electrical polarity correction earth leakage protective device and control method |
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| CN201510980467.1A CN105490246B (en) | 2015-12-22 | 2015-12-22 | A kind of alternating electrical polarity correction earth leakage protective device and control method |
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| CN107123252A (en) * | 2017-05-27 | 2017-09-01 | 南京林洋电力科技有限公司 | A kind of M BUS trailing frogs and its intelligent switching circuit |
| CN107302739B (en) * | 2017-07-18 | 2021-06-04 | 深圳致摩科技有限公司 | Microphone box electric leakage judging and protecting system |
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| US7714587B2 (en) * | 2007-06-29 | 2010-05-11 | Caterpillar Inc. | Systems and methods for detecting a faulty ground strap connection |
| WO2009126247A1 (en) * | 2008-04-07 | 2009-10-15 | Technology Research Corporation | Over heating detection and interrupter circuit |
| US9577423B2 (en) * | 2013-04-11 | 2017-02-21 | Eaton Corporation | Power system including a load panel protecting a facility from a broken or missing neutral of a split phase electrical distribution configuration |
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| FR2842663A1 (en) * | 2002-07-18 | 2004-01-23 | Schneider Electric Ind Sa | DEVICE FOR MONITORING NEUTRAL AND EARTH BREAKAGE, AND ELECTRICAL SWITCHING APPARATUS COMPRISING SUCH A DEVICE |
| CN201243203Y (en) * | 2008-07-25 | 2009-05-20 | 比亚迪股份有限公司 | Safety protection device for electric appliance |
| CN201488255U (en) * | 2009-08-28 | 2010-05-26 | 宁波方太厨具有限公司 | Electric heater with earth wire live detection function |
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| CN205304219U (en) * | 2015-12-22 | 2016-06-08 | 张正怡 | Earthleakage protective equipment is corrected to alternating current polarity |
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