CN107359592A - A kind of SCM Based earth leakage protective detecting system - Google Patents
A kind of SCM Based earth leakage protective detecting system Download PDFInfo
- Publication number
- CN107359592A CN107359592A CN201710700266.0A CN201710700266A CN107359592A CN 107359592 A CN107359592 A CN 107359592A CN 201710700266 A CN201710700266 A CN 201710700266A CN 107359592 A CN107359592 A CN 107359592A
- Authority
- CN
- China
- Prior art keywords
- resistance
- electromagnet
- chip microcomputer
- zero sequence
- sequence current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Abstract
The present invention relates to a kind of SCM Based earth leakage protective detecting system; including live wire, the neutral conductor and zero sequence current mutual inductor; the live wire and the neutral conductor separate some groups of branch roads system units parallel with one another, and every group of branch roads system unit connects through the power port of zero sequence current mutual inductor and system unit；Also include controller, the first electromagnet, normally open push button switch, the second electromagnet and controlling switch；The present invention can play leakage protection to small system unit; control controller built in system can record temperature before and after electric leakage time, electric leakage duration and electric leakage, the change of humidity and data be radioed into director server, and basis is provided for the data analysis of director server；The reset function of the present invention can use single-chip microcomputer or touch screen display control, and remote reset or maintenance worker can be facilitated to reset on the spot.
Description
Technical field
The present invention relates to earth leakage protective field, more particularly to a kind of SCM Based earth leakage protective detecting system.
Background technology
Conventional earth leakage protective device is that live wire and the neutral conductor are passed through into zero sequence current mutual inductor, then that zero-sequence current is mutual
The secondary windings output end of sensor is connected with relay, and relay is connected with electrical apparatus release, when circuit is normal, power firestreak outflow
Electric current with through overload therefrom property line return electric current it is equal, reach balance, now the secondary windings of zero sequence current mutual inductor
Output current is zero；When system is leaked electricity, then the electric current of power firestreak outflow is equal to through the overload electric current that therefrom property line returns
With leakage current sum, i.e. power firestreak outflow electric current forms electric current with the electric current disequilibrium returned by load neutral line
Difference, now according to hall principle, the secondary windings output end of zero sequence current mutual inductor produces electric current, the caused function of current in after
Electrical equipment, makes Control electrical apparatus release, and electrical apparatus release finally disconnects the live wire of main circuit and the neutral conductor, reaches the mesh of electric leakage power-off
's.
Above-mentioned earth leakage protective device can play a very good protection to triangular web, but be set for large-scale numerous and diverse power network
It is standby, then limitation be present.
Grid equipment of today is intended to all the more intelligent and big data, and intelligentized network system can be respectively to small
System unit does Data Detection, for example, the specific orientation of electric leakage system unit can be detected immediately upon, can detect electric leakage at once
Reason, duration that electric leakage occurs etc. can be detected；And big dataization be then the data that intellectualizing system detects can be done it is whole
The data analysis of body, the data such as specific influence and economic loss caused by electric leakage duration are counted, so as to reasonably distribution inspection
Repair task and formulate repair schedule.
The content of the invention
The present invention is adapted to small in view of the above-mentioned problems, a kind of SCM Based earth leakage protective detecting system of offer
The related data of earth leakage protective process is simultaneously recorded feedback by system unit.
A kind of SCM Based earth leakage protective detecting system provided by the invention, including live wire, the neutral conductor and zero sequence electricity
Current transformer, the live wire and the neutral conductor separate some groups of branch roads system units parallel with one another, and every group of branch roads system unit is worn
The power port for crossing zero sequence current mutual inductor and system unit connects, it is characterised in that also including controller, the first electromagnet, often
Open button switch, the second electromagnet and controlling switch；The secondary windings output end of the zero sequence current mutual inductor connects with controller
Connect；The controller is connected with the coiling both ends of the first electromagnet；The magnetic core of first electromagnet is controlled normal by electromagnetic force
Open button switch closure；One end of the normally open push button switch is connected with the live wire of branch roads system unit, normally open push button switch
The other end is connected with coiling one end of the second electromagnet；In the coiling other end and branch roads system unit of second electromagnet
Property line connection；The magnetic core of second electromagnet controls the disconnection of controlling switch by electromagnetic force；
The controller includes power module, single-chip microcomputer and the zero-crossing comparator with being connected respectively with single-chip microcomputer, temperature
Sensor, humidity sensor, memory module, wireless receiving module, wireless sending module and touch screen displays；The zero-sequence current
The secondary windings output end of transformer is connected with zero-crossing comparator；The power module is ups power, and branch roads system unit powers off
Afterwards, power module is that temperature sensor, humidity sensor, memory module, wireless receiving module, wireless sending module, touch screen show
Show device and single-chip microcomputer power supply.
The present invention also provides the secondary windings output end of the zero sequence current mutual inductor to the first electromagnet coiling both ends
Circuit structure, it is as follows：
One end of the secondary windings output end of zero sequence current mutual inductor positive input with first comparator respectively
And one end connection of first resistor, the other end of the secondary windings output end of zero sequence current mutual inductor are another with first resistor respectively
One end, one end connection of one end of second resistance, one end of the 4th resistance and the 6th resistance；The other end of the second resistance point
It is not connected with the inverting input of first comparator and one end of 3rd resistor；The output end of the first comparator is respectively with
One end of the other end of three resistance and the 5th resistance connects；The positive input of the other end and the second comparator of 5th resistance
End connection；The inverting input of second comparator is connected with the other end of the 6th resistance and one end of the 7th resistance respectively,
The output end of second comparator and the input of single-chip microcomputer connect；The output I/O mouths of the single-chip microcomputer and one end of the 8th resistance
Connection, the other end of the 8th resistance and the base stage of triode connect；The other end of the emitter stage of triode and the 7th resistance is grounded,
The collector of triode is connected with one end of the 9th resistance；The other end of the 9th resistance positive pole and the first electromagnetism with diode respectively
Winding one end connection of iron；The other end of the negative pole of the diode, the winding other end of the first electromagnet and the 4th resistance point
It is not connected on power module.
As the further optimization of said system, in addition to resetting means；The SR is used to control controlling switch
Closure；Preferably, the resetting means is automatic structure, resetting means is controlled by single-chip microcomputer.
The beneficial effects of the invention are as follows：
A kind of SCM Based earth leakage protective detecting system provided by the invention can play electric leakage to small system unit
Protective effect, the control controller built in system can record electric leakage the time, electric leakage duration and electric leakage before and after temperature, humidity change
Change and data are radioed into director server, basis is provided for the data analysis of director server, while can also be by data feedback
Onto display, the worker to maintenance provides data reference；The reset function of the present invention can use single-chip microcomputer or touch screen display control
System, can facilitate remote reset or maintenance worker to reset on the spot；The present invention also provides the specific control circuit of single-chip microcomputer, this circuit
Electromagnet is controlled using single-chip microcomputer, equipment power supply can be cut off rapidly in 0.1 second, it is ensured that electric leakage will not damage to human body.
Brief description of the drawings
Fig. 1 is a kind of SCM Based earth leakage protective detecting system structural representation of the present invention；
Fig. 2 is controller architecture schematic diagram in system shown in Figure 1；
Fig. 3 is system shown in Figure 1 earth leakage protective control section structural representation.
Embodiment
The present invention is elaborated below in conjunction with specific embodiment.
Embodiment is as shown in figure 1, the present embodiment includes live wire, the neutral conductor and zero sequence current mutual inductor, and the live wire is with
Property line separate some groups of branch roads system units parallel with one another, every group of branch roads system unit passes through zero sequence current mutual inductor, respectively
It is connected with system unit 1, system unit 2 until system unit n power port.
Also include controller, the first electromagnet K1, normally open push button switch SB, the second electromagnet K2 and control in the present embodiment
Switch SA；The secondary windings output end of the zero sequence current mutual inductor is connected with controller；The controller and the first electromagnet
K1 coiling both ends connection；The magnetic core of the first electromagnet K1 normally open push button switch SB closure controlled by electromagnetic force, it is necessary to
Illustrate, the normally open push button switch SB is in normally open, it is necessary to which its closure, button after hand release can just be made by pressing button
Built-in spring can make it return to normally open again；One end of the normally open push button switch SB and the live wire of branch roads system unit
Connection, the normally open push button switch SB other end are connected with the second electromagnet K2 coiling one end；The second electromagnet K2 around
The line other end is connected with the neutral conductor of branch roads system unit；The magnetic core of the second electromagnet K2 controls control to open by electromagnetic force
The disconnection of pass is, it is necessary to which explanation, the controlling switch SA normally make branch roads system unit be on shape in normally off
State.
As shown in Fig. 2 controller noted above includes power module, single-chip microcomputer and the zero passage ratio with being connected respectively with single-chip microcomputer
Compared with device, temperature sensor, humidity sensor, memory module, wireless receiving module, wireless sending module and touch screen displays；Institute
The secondary windings output end for stating zero sequence current mutual inductor is connected with zero-crossing comparator；The power module is ups power, branch road system
Unite after unit power-off, power module is temperature sensor, humidity sensor, memory module, wireless receiving module, wireless transmission mould
Block, touch screen displays and single-chip microcomputer power supply.
When circuit leaks electricity, that is, there is system unit electric current to flow in the earth, cause power firestreak outflow electric current with
The electric current disequilibrium that the neutral conductor returns forms difference between current, and then the secondary windings output end of zero sequence current mutual inductor produces electricity
Stream.Caused electric current passes through zero-crossing comparator, is signaled after zero-crossing comparator processing to single-chip microcomputer, single-chip microcomputer reception signal is made
After judgement, the first electromagnet K1 of control coiling is powered, and after energization, the first electromagnet K1 magnetic core produces magnetic field, the magnetic field
Effect normally open push button switch SB closes normally open push button switch SB, after normally open push button switch SB closures, makes the second electromagnet K2's
Coiling is powered to forming loop, and now, the second electromagnet K2 coiling magnetic core produces magnetic field, magnetic fields controlling switch SA, control
System switch SA is double-pole switch, and controlling switch SA disconnects branch roads system unit, stops the electricity consumption of the system unit, play electric leakage
The effect of protection.
Above-mentioned second electromagnet K2 coiling forms loop using branch roads system unit, and without separately setting power supply, optimize
Structure division, and after controlling switch SA cuts off branch roads system unit, the second electromagnet K2 coiling also disconnects, and makes the second electricity
Magnet K2 functionally mutually agrees with whole circuit, without separately setting control, optimizes control section.
Because power module selects ups power, the disconnection of branch roads system unit can't impact to power module, institute
With power module after a loss of power immediately to temperature sensor, humidity sensor, memory module, wireless receiving module, wireless transmission
Module, touch screen displays and single-chip microcomputer power supply.Single-chip microcomputer is receiving the signal that sends of zero-crossing comparator simultaneously, records power-off
To incoming call time and be stored to memory module, while the letter that single-chip microcomputer also transmits temperature sensor and humidity sensor
Number storage in a storage module.
The data transmitted are also sent to director server by single-chip microcomputer by wireless sending module simultaneously, are the number of director server
Basis is provided according to analysis；Certainly, single-chip microcomputer can also be included corresponding data in touch screen by the touch screen displays being attached thereto
On display, overhaul and refer to for maintenance worker, maintenance worker can also send certain finger to single-chip microcomputer by touch screen displays
Order, to control the leakage protection circuit.
As shown in figure 3, the present embodiment additionally provides the secondary windings output end of zero sequence current mutual inductor to the first electromagnet
The circuit structure at K1 coilings both ends, it is specific as follows：
One end of the secondary windings output end of the zero sequence current mutual inductor inputs with first comparator A1 forward direction respectively
End and the connection of first resistor R1 one end, the other end of the secondary windings output end of zero sequence current mutual inductor respectively with first resistor
The R1 other end, one end connection of second resistance R2 one end, the 4th resistance R4 one end and the 6th resistance R6；Second electricity
The resistance R2 other end is connected with first comparator A1 inverting input and 3rd resistor R3 one end respectively；Described first compares
Device A1 output end is connected with the 3rd resistor R3 other end and the 5th resistance R5 one end respectively；The 5th resistance R5's is another
One end is connected with the second comparator A2 positive input；The inverting input of the second comparator A2 respectively with the 6th resistance
The R6 other end and the 7th resistance R7 one end connect, and the second comparator A2 output end is defeated with single-chip microcomputer (i.e. SCM in Fig. 3)
Enter end connection；The output I/O mouths of the single-chip microcomputer are connected with the 8th resistance R8 one end, the 8th resistance R8 other end and three poles
Pipe Q base stage connection；Triode Q emitter stage and the 7th resistance the R7 other end are grounded, triode Q collector and the 9th resistance
R9 one end connection；The 9th resistance R9 other end connects with diode D positive pole and the first electromagnet K1 winding one end respectively
Connect；The other end of the negative pole of the diode D, the first electromagnet K1 winding other end and the 4th resistance R4 is connected on power supply respectively
In module.
From the foregoing, after the response that the corresponding second comparator A2 output ends of single-chip microcomputer are sent is interrupted, from single-chip microcomputer
I/O mouths export high level and drive the first electromagnet K1 coiling conducting to triode Q, triode Q, finally realize earth leakage protective
Function, monolithic function make circuit rapid cut-out power supply in 0.1 second, also correspond to that wound of the electric current to human body can be cut off rapidly
Evil, it is ensured that personal safety.
Because power module provides direct current, so in foregoing circuit, at the first electromagnet K1 coiling both ends simultaneously
A diode D is joined, a back-emf loop is formed when this is to prevent the first electromagnet K1 coiling deenergization, is kept away
Back-emf caused by exempting from impacts or damaged element to circuit.
On the basis of above-described embodiment, a resetting means can also be increased and be used for controlling controlling switch SA, work as electric leakage
After maintenance terminates, worker can be closed by resetting means controlling switch SA makes the branch roads system element circuit turn on again；When
So, resetting means can be further improved, i.e., from automatic mechanical device, such as from micro-machine or minitype cylinder etc.
To press controlling switch, robot apparatus directly can be connected with single-chip microcomputer, and operator can control monolithic with touch screen displays
Machine, single-chip microcomputer is controlled resetting means, reach the purpose of control controlling switch SA closures.
The single-chip microcomputer is also connected with wireless receiving module, and director server can be sent out by the wireless receiving module to single-chip microcomputer
The number of delivering letters, to control controlling switch SA, remote reset function is realized, adds the intelligence degree of system.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of scope is protected, although being explained with reference to preferred embodiment to the present invention, one of ordinary skill in the art should
Work as understanding, technical scheme can be modified or equivalent substitution, without departing from the reality of technical solution of the present invention
Matter and scope.
Claims (4)
1. a kind of SCM Based earth leakage protective detecting system, including live wire, the neutral conductor and zero sequence current mutual inductor, the fire
Line and the neutral conductor separate some groups of branch roads system units parallel with one another, and every group of branch roads system unit passes through zero sequence current mutual inductor
It is connected with the power port of system unit, it is characterised in that also including controller, the first electromagnet, normally open push button switch, the second electricity
Magnet and controlling switch；The secondary windings output end of the zero sequence current mutual inductor is connected with controller；The controller and
The coiling both ends connection of one electromagnet；The magnetic core of first electromagnet controls normally open push button switch to close by electromagnetic force；Institute
The one end for stating normally open push button switch is connected with the live wire of branch roads system unit, the other end of normally open push button switch and the second electromagnet
Coiling one end connection；The coiling other end of second electromagnet is connected with the neutral conductor of branch roads system unit；Described second
The magnetic core of electromagnet controls the disconnection of controlling switch by electromagnetic force；
The controller includes power module, single-chip microcomputer and zero-crossing comparator, TEMP with being connected respectively with single-chip microcomputer
Device, humidity sensor, memory module, wireless receiving module, wireless sending module and touch screen displays；The zero sequence current mutual inductance
The secondary windings output end of device is connected with zero-crossing comparator；The power module is ups power, after the power-off of branch roads system unit,
Power module is temperature sensor, humidity sensor, memory module, wireless receiving module, wireless sending module, touch screen displays
And single-chip microcomputer power supply.
A kind of 2. SCM Based earth leakage protective detecting system according to claim 1, it is characterised in that the zero sequence electricity
The circuit structure at the secondary windings output end of current transformer to the first electromagnet coiling both ends is as follows：
One end of the secondary windings output end of the zero sequence current mutual inductor respectively with the positive input of first comparator and
One end connection of one resistance, the other end of the secondary windings output end of zero sequence current mutual inductor are another with first resistor respectively
End, one end connection of one end of second resistance, one end of the 4th resistance and the 6th resistance；The other end difference of the second resistance
It is connected with the inverting input of first comparator and one end of 3rd resistor；The output end of the first comparator is respectively with the 3rd
One end of the other end of resistance and the 5th resistance connects；The other end of 5th resistance and the positive input of the second comparator
Connection；The inverting input of second comparator is connected with the other end of the 6th resistance and one end of the 7th resistance respectively, the
The output end of two comparators and the input of single-chip microcomputer connect；The output I/O mouths of the single-chip microcomputer and one end of the 8th resistance connect
Connect, the other end of the 8th resistance and the base stage of triode connect；The other end of the emitter stage of triode and the 7th resistance is grounded, and three
The collector of pole pipe is connected with one end of the 9th resistance；The other end of the 9th resistance positive pole and the first electromagnet with diode respectively
Winding one end connection；The other end difference of the negative pole of the diode, the winding other end of the first electromagnet and the 4th resistance
It is connected on power module.
3. a kind of SCM Based earth leakage protective detecting system according to claim 1 or claim 2, it is characterised in that also include
Resetting means；The SR is used to control controlling switch to close.
4. a kind of SCM Based earth leakage protective detecting system according to claim 3, it is characterised in that described to reset dress
Automatic structure is set to, resetting means is controlled by single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710700266.0A CN107359592A (en) | 2017-08-16 | 2017-08-16 | A kind of SCM Based earth leakage protective detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710700266.0A CN107359592A (en) | 2017-08-16 | 2017-08-16 | A kind of SCM Based earth leakage protective detecting system |
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| Publication Number | Publication Date |
|---|---|
| CN107359592A true CN107359592A (en) | 2017-11-17 |
Family
ID=60287145
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710700266.0A Pending CN107359592A (en) | 2017-08-16 | 2017-08-16 | A kind of SCM Based earth leakage protective detecting system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201146162Y (en) * | 2007-11-23 | 2008-11-05 | 上海市电力公司 | Earth leakage protective breaker for non-motion dead region |
| EP2017934A2 (en) * | 2007-07-19 | 2009-01-21 | Honeywell International Inc. | Method of providing a secondary means of overload protection and leakage current protection in applications using solid state power controllers |
| CN202789474U (en) * | 2012-10-04 | 2013-03-13 | 孟祥卿 | Alarm control device for hydraumatic blowout-preventing controller in petroleum drilling |
| CN205265232U (en) * | 2015-12-28 | 2016-05-25 | 安徽理工大学 | Novel colliery low -voltage power supply network selective earth lea kage protection in pit device |
| CN106803631A (en) * | 2016-12-30 | 2017-06-06 | 宁波市恒祺电子科技有限公司 | Leakage protecting plug, water-heater system and its method |
-
2017
- 2017-08-16 CN CN201710700266.0A patent/CN107359592A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2017934A2 (en) * | 2007-07-19 | 2009-01-21 | Honeywell International Inc. | Method of providing a secondary means of overload protection and leakage current protection in applications using solid state power controllers |
| CN201146162Y (en) * | 2007-11-23 | 2008-11-05 | 上海市电力公司 | Earth leakage protective breaker for non-motion dead region |
| CN202789474U (en) * | 2012-10-04 | 2013-03-13 | 孟祥卿 | Alarm control device for hydraumatic blowout-preventing controller in petroleum drilling |
| CN205265232U (en) * | 2015-12-28 | 2016-05-25 | 安徽理工大学 | Novel colliery low -voltage power supply network selective earth lea kage protection in pit device |
| CN106803631A (en) * | 2016-12-30 | 2017-06-06 | 宁波市恒祺电子科技有限公司 | Leakage protecting plug, water-heater system and its method |
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Application publication date: 20171117 |
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