CN205958660U - Intelligent tester of earth leakage protection - Google Patents
Intelligent tester of earth leakage protection Download PDFInfo
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- CN205958660U CN205958660U CN201620586385.9U CN201620586385U CN205958660U CN 205958660 U CN205958660 U CN 205958660U CN 201620586385 U CN201620586385 U CN 201620586385U CN 205958660 U CN205958660 U CN 205958660U
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- earth leakage
- leakage protective
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- 238000012360 testing method Methods 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000009471 action Effects 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 56
- 238000001914 filtration Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 12
- 238000004088 simulation Methods 0.000 abstract description 9
- 230000001012 protector Effects 0.000 abstract description 7
- 230000003245 working effect Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000010356 wave oscillation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an intelligent tester of earth leakage protection, including test box and singlechip, the output that is used for inserting earth -leakage protector's contact state observation circuit is connected to singlechip electricity respectively, an input for producing the simulation able to programme electric leakage electric current source of the even electric leakage electric current that changes, an output and be used for bring -up test instruction for detecting the electric leakage electric current current detection circuit, set up the touch panel's of electric leakage current parameter and demonstration testing result input and output, the output in simulation able to programme electric leakage electric current source still is connected with current detection circuit's input electricity. Adopting the current value of singlechip real time control electric leakage, making the electric leakage electric current evenly increase, can effectively improve the measuring degree of accuracy, measurable quantity and record earth -leakage protector's contact break -time, electric leakage action current and non -operating current provide the important technical indicator of improving the earth -leakage protector working property, detect automatic competently.
Description
Technical field
This utility model is related to electric field and in particular to a kind of earth leakage protective intelligent tester.
Background technology
Earth leakage protective device, abbreviation leakage switch, is RCCB again, is primarily used to when equipment occurs leak current fault
And to there being the personal electrical shock protection of fatal risk, there is overload and short-circuit protection function, can be used to protection circuit or motor
Overload and short circuit, also can under normal circumstances as circuit infrequently conversion start be used, at present, earth leakage protective device conduct
, no matter install and use very universal in city or in rural area, the reliability that it works is direct for a kind of new low-voltage variation electrical equipment
Impact personal safety, is the Electrical Safety protection device that government's mandatory provision is carried out in the U.S., and every two years must change.I
Although state does not have the time limit that mandatory provision is changed to the use of earth leakage protective device, from the point of view of Electrical Safety, periodically right
The detection of earth leakage protective device service behaviour has to do.
Tester for leakage protector be mainly used in test earth leakage protective device residual operating current, electric leakage non-operating current with
And leak electricity movement time, main 3 parameters of reflection electric leakage performance are：Rated residual operating current (I △ n), electric leakage are dynamic
Make time and specified electric leakage non-operating current (I △ n0), I △ n characterizes the sensitivity of electric leakage action, is the electric leakage of earth leakage protective device
Action current value, when electric leakage refers to earth leakage protective device is applied with required residual operating current arrives cut-out circuit movement time
Between, I △ n0 is to prevent False Leakage Protector Operation, the leakage current value being failure to actuate of national Specification, generally takes 0.5I △
N, test residual operating current method be：From starting to apply test electric current less than 0.2I △ n, linearly increase to I in 30s
△ n, if the current value that earth leakage protective device disconnects moment is I △, when meeting I △ n0<I△<During I △ n, the electric leakage of earth leakage protective device
Action current value is qualified, and therefore, uniformly growth will directly affect the accuracy of measurement, using biography to the leakage current value of test
System manually and Motor drive pressure regulator method be difficult to make the current value that test is leaked electricity uniformly increase it is difficult to control measure with
Chance error is poor.
Content of the invention
For solving above-mentioned technical problem, goal of the invention of the present utility model is to provide one kind to make leakage current uniformly increase
Long, the earth leakage protective intelligent tester of the accuracy of measurement can be effectively improved.
For achieving the above object, this utility model provides following technical scheme：A kind of earth leakage protective is intelligent to be surveyed
Examination instrument, including test casing, described earth leakage protective intelligent tester also includes single-chip microcomputer, and described single-chip microcomputer is electrically connected use
In access earth leakage protective device contact state observation circuit outfan, for produce even variation leakage current programmable
Simulate the input in leakage current source, be used for detecting the outfan of current detection circuit of described leakage current and being used for sending
Test instruction, setting leakage current parameter and the display input of contact panel of testing result and outfan, described compile
The outfan that journey simulates leakage current source also electrically connect with the input of described current detection circuit, described single-chip microcomputer, described tactile
Head status observation circuit, described programmable analog leakage current source and described current detection circuit are built in described test respectively
In casing, the earth leakage protective device incoming end of described contact state observation circuit extends to outside described test casing, described touch-control
Panel is arranged on outside described test casing.
Preferably, described contact panel and described single-chip microcomputer wired connection, described contact panel is fixed on described test box
On the outer wall of body.
Preferably, described contact panel is wirelessly connected with described single-chip microcomputer, and described contact panel is set to PAD structure.
Preferably, described test casing is additionally provided with its interior and passage with its outer wall insertion and described in being accommodated in
In passage or stretch out drawer type shelf outside described test casing, described drawer type shelf is used for fixing described contact shape respectively
The earth leakage protective device incoming end of state observation circuit and the described earth leakage protective device of placement.
Preferably, described programmable analog leakage current source is by sine-wave generator and of ac D/A converting circuit structure
Become.
Preferably, described current detection circuit includes current transformer, some diodes, resistance and amplifier, described electricity
Current transformer connects earth leakage protective device, and described current transformer is used for collecting test electric current, and described test electric current is by described
Diode, described resistance and the filtering of described amplifier, amplification.
Preferably, described contact state observation circuit connects earth leakage protective device, and described contact state observation circuit is contact
Make and break circuit, described contact state observation circuit includes photoelectrical coupler, phase inverter and some diodes and resistance.
Preferably, described single-chip microcomputer is provided with A/D change-over circuit and control circuit, described current detection circuit and described contact
Status monitoring circuit is electrically connected with described A/D change-over circuit respectively, and described A/D change-over circuit is electrically connected with described control circuit,
Described control circuit respectively with button assembly, liquid crystal display, action execution unit and described programmable analog leakage current
Source electrically connects.
Because technique scheme is used, this utility model compared with prior art has following advantages：
1. tester of the present utility model adopts the current value of single-chip microcomputer real-time control electric leakage, so that leakage current is uniformly increased
Long, the accuracy of measurement can be effectively improved, can measure and record the contact break of earth leakage protective device, residual operating current and
Non-operating current, there is provided improve the important technology index of earth leakage protective device service behaviour, detection automatization level is high, can detect
The online earth leakage protective device with non-on-line operation；
2. tester of the present utility model passes through to arrange contact panel, compares traditional button operation, and contact panel uses
Life-span is longer, and contact panel can be fixedly installed, and is movably arranged, and while being detected, operator can be with handheld touch
Panel is away from test equipment, accident so as to avoid an accident, or processes other emergency managements simultaneously；
3. tester of the present utility model passes through to arrange passage and drawer type shelf, when being tested, drawer type shelf
Pull-out, the sudden and violent leakage of incoming end making contact state observation circuit is outside test casing, and makes earth leakage protective device have special placement
Place, when not tested, drawer type shelf withdraws；
4. tester of the present utility model, with single chip computer AT mega32 as core, extends programmable leakage current source, leakage
The ancillary equipment such as the testing circuit of electric current, the observation circuit of contact state, keyboard and display.ATmega32 is based on enhancement mode
8 8-digit microcontrollers of AVR risc architecture, instruction set is advanced, and time for each instruction adopts single clock cycle, and speed is common
8～12 times of 8051 single-chip microcomputers.Operating frequency reaches 16MHz, and in piece, 32K bytes Flash program storage, 1 16, hardware are fixed
When device and 28 bit timing devices, 4 road PWM outputs, 8 road A/D conversions, 1 asynchronous pull-duplex extending serial port, 32 universaling I/O ports.Tool
Have the advantages that low-power consumption, at a high speed, superpower anti-interference, there is in like product higher cost performance.
Brief description
Fig. 1 is the composition block diagram of earth leakage protective intelligent tester disclosed in this utility model；
Fig. 2 is the structural representation of the test casing of earth leakage protective intelligent tester disclosed in this utility model；
Fig. 3 is the structural representation of A/D conversion and control circuit disclosed in this utility model；
Fig. 4 is the structural representation of contact state observation circuit disclosed in this utility model；
Fig. 5 shows for the structure of the of ac D/A converting circuit in programmable analog leakage current source disclosed in this utility model
It is intended to；
Fig. 6 is the structural representation of current detection circuit disclosed in this utility model.
Wherein, 10, test casing；20 single-chip microcomputers；30th, contact state monitoring；40th, programmable analog leakage current source；50、
Current detection circuit；60th, contact panel.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used for this utility model is described, but is not limited to scope of the present utility model.
Referring to Fig. 1 to Fig. 6, as shown in legend therein, a kind of earth leakage protective intelligent tester, including test casing
10 and single-chip microcomputer 20, single-chip microcomputer 20 is electrically connected the output of the contact state observation circuit 30 for accessing earth leakage protective device
Hold, be used for producing the input in programmable analog leakage current source 40 of leakage current of even variation, being used for detecting described leakage
The outfan of current detection circuit 50 of electric current and being used for sends test instruction, setting leakage current parameter and display inspection
Survey the input of contact panel 60 of result and outfan, the outfan in programmable analog leakage current source 40 also with current detecting
The input electrical connection of circuit 50, single-chip microcomputer 20, contact state observation circuit 30, programmable analog leakage current source 40 and electricity
Current detection circuit 50 is built in test casing 10 respectively, and the earth leakage protective device incoming end of contact state observation circuit 30 extends to
Outside test casing 10, contact panel 60 is arranged on outside test casing 10.
Test casing 10 is additionally provided with its interior and passage (not shown in FIG.) with its outer wall insertion and is accommodated in
In passage or stretch out drawer type shelf 11 outside test casing, drawer type shelf 11 is used for respectively fixed contact status monitoring electricity
The earth leakage protective device incoming end on road 30 and placement earth leakage protective device.
Single-chip microcomputer 20 adopts ATmega32 model, and the commencing signal that the leakage current of earth leakage protective device produces passes through program control
System, dynamic and static contact cut-off signal sends into the external interrupt input PD2 of ATmega32, to earth leakage protective by the way of interrupting
The break of the dynamic and static contact of device is detected, button S1 selects as test function, for selecting to measure leakage current or leakage
Electric movement time.Button S2 is used for selecting to simulate a certain shelves in leakage current 50mA, 100mA, 200mA and 500mA.Button S3
It is when movement time is leaked electricity in measurement with S4, for setting the current value of simulation electric leakage, S3 controls the current value that simulation is leaked electricity to increase
Plus, S4 controls the current value of simulation electric leakage to reduce.S5 is test start/stop control button.When measuring leakage current, set
Good parameter presses S5, the gear output data that ATmega32 selects according to S2, makes simulation leakage current increase to maximum from 0,
If simulation leakage current reaches earth leakage protective device action during a certain current value, this current value is exactly actual residual operating current
Value.When movement time is leaked electricity in test, press S5 after setting leakage current parameter, ATmega32 is straight according to the current value setting
The simulation leakage current that life of practicing midwifery sets, realizes measurement and leaks electricity movement time.
Contact state observation circuit 30 connects an earth leakage protective device, and this contact state observation circuit is contactor deenergizing,
And this contact state observation circuit includes a photoelectrical coupler, phase inverter and some diodes and resistance, specifically, this electric leakage
During the dynamic and static contact closure of protector, alternating current passes through rectification, filtering, voltage stabilizing, so that photoelectrical coupler G3 is turned on, this phase inverter A
Exporting 2 feet is high potential；When the dynamic and static contact disjunction of this earth leakage protective device, this photoelectrical coupler G3 ends, and A is defeated for this phase inverter
Going out 2 feet is electronegative potential, the moment terminating as detection of electrical leakage.And, in specific implementation process, when this earth leakage protective device
During dynamic and static contact closure, the electric current of this photoelectrical coupler G3 passes through a mutually dynamic and static contact of this earth leakage protective device, due to flowing through
The electric current of one mutually dynamic and static contact of this earth leakage protective device is the direct current through over commutation, filtering and voltage stabilizing, will not be in earth leakage protective device
In zero sequence current mutual inductor secondary side produce faradic current, therefore, there is no shadow to the residual operating current of earth leakage protective device
Ring.
Programmable analog leakage current source 40 is touched change-over circuit and is constituted by the sine-wave generator of 50Hz, of ac number,
The RC sine wave oscillation circuit of 50Hz is made up of operational amplifier.The amplitude of stable oscillation stationary vibration signal is using non-linear negative feedback,
Meanwhile, the frequency selection circuit of RC sine wave oscillation circuit is constituted it is ensured that oscillation frequency using resistance and the capacity cell of low-temperature coefficient
The stablizing of rate, in order to improve load-carrying ability, sine wave signal output exports through voltage follower.Of ac digital-to-analogue conversion
Circuit is the core in programmable analog leakage current source, and the size of simple alternating current amount amplitude is to be controlled by changing digital quantity
System, has the good linearity, constitutes D/A converting circuit with DAC0808, this device is 8 D/A of binary system Fast Multiplication formula
Chip.In order to improve measuring speed, ensure simulation leakage current accuracy under conditions of, by output current be divided into 50mA,
100mA, 200mA and 500mA fourth gear, the selection of each shelves to be realized by the size of ATmega32 convert resistance R1.In different shelves
Position, the numerical values recited that electric current increases is different.When selecting 50mA gear, electric current is to pass according to 0.196mA (50mA/255)
Increase；When selecting 500mA gear, electric current is to be incremented by according to 1.96mA (500mA/255), therefore, can fully meet and protect for electric leakage
Shield device provides the requirement of linearly increasing leakage current.
Current detection circuit 50 includes a current transformer, some diodes, some resistance and an amplifier, and this electric current is examined
The current transformer of slowdown monitoring circuit 50 connects programmable analog leakage current source 40, and specifically, the primary side of this current transformer is even
It is connected in circuit for electric leakage protector, collect test electric current using mutual inductance phenomenon from the secondary side of this current transformer, and this electricity
The sampling of current transformer determines than by the coil ratio of this current transformer, by this current transformer, programmable analog is leaked
The test electric current that electric current source 40 produces is sampled, and the secondary side output signal of this current transformer is passed through filtering, puts
Big and voltage increase, sends in this current detection circuit after being transformed to the electrode signal that A/D module can gather；?
When this current detection circuit 50 detection test size of current, the cycle according to this test electric current is according to 40 points of each cycle
Sampled, after sampling a cycle, the attenuation multiple according to current transformer and the numerical value of booster tension, calculate reality
Current effective value；And, in specific current detection circuit, when the instantaneous value of alternating current reaches positive peak value, put
Big device output 5V, when the instantaneous value of alternating current reaches negative peak, amplifier exports 0V.
Contact panel 60 and single-chip microcomputer 20 wired connection, contact panel 60 is fixed on the outer wall of test casing 10 or touch-control
Panel 60 is wirelessly connected with single-chip microcomputer 20, and contact panel 60 is set to PAD structure, arranges according to actual needs.
Work process：By current detection circuit real-time detection and gather programmable analog leakage current source generation test
Electric current, and this test electric current is sent to single-chip microcomputer, this single-chip microcomputer is compared with setting value to the test current value of Real-time Collection, should
Single-chip Controlling electric power pressure regulation unit controls the leakage current that programmable analog leakage current source produces to adjust to setting value.
It is more than the description to this utility model embodiment, by the described above to the disclosed embodiments, make ability
Domain professional and technical personnel is capable of or uses this utility model.To multiple modifications of these embodiments specialty to this area
Will be apparent from for technical staff, generic principles defined herein can be without departing from spirit of the present utility model
Or in the case of scope, realize in other embodiments.Therefore, this utility model be not intended to be limited to shown in this article these
Embodiment, and it is to fit to the wide scope consistent with principles disclosed herein and features of novelty.
Claims (8)
1. a kind of earth leakage protective intelligent tester, including test casing it is characterised in that described earth leakage protective intelligent test
Instrument also includes single-chip microcomputer, and described single-chip microcomputer is electrically connected the output of the contact state observation circuit for accessing earth leakage protective device
Hold, be used for producing the input in programmable analog leakage current source of leakage current of even variation, being used for detecting described electric leakage
The outfan of the current detection circuit of electric current and being used for sends test instruction, setting leakage current parameter and display detection knot
The input of the contact panel of fruit and outfan, the outfan in described programmable analog leakage current source also with described current detecting
Circuit input electrical connection, described single-chip microcomputer, described contact state observation circuit, described programmable analog leakage current source with
And described current detection circuit is built in described test casing respectively, the earth leakage protective device of described contact state observation circuit connects
Enter end and extend to outside described test casing, described contact panel is arranged on outside described test casing.
2. earth leakage protective intelligent tester according to claim 1 is it is characterised in that described contact panel and described list
Piece machine wired connection, described contact panel is fixed on the outer wall of described test casing.
3. earth leakage protective intelligent tester according to claim 1 is it is characterised in that described contact panel and described list
Piece machine wirelessly connects, and described contact panel is set to PAD structure.
4. earth leakage protective intelligent tester according to claim 1 is it is characterised in that described test casing is additionally provided with
On its interior and passage with its outer wall insertion and be accommodated in described passage or stretch out the drawer outside described test casing
Formula shelf, described drawer type shelf is used for fixing earth leakage protective device incoming end and the placement of described contact state observation circuit respectively
Described earth leakage protective device.
5. earth leakage protective intelligent tester according to claim 1 is it is characterised in that the electric leakage of described programmable analog is electric
Stream source is made up of sine-wave generator and of ac D/A converting circuit.
6. earth leakage protective intelligent tester according to claim 1 is it is characterised in that described current detection circuit includes
Current transformer, some diodes, resistance and amplifier, described current transformer connects earth leakage protective device, described Current Mutual Inductance
Device is used for collecting test electric current, and described test electric current passes through described diode, described resistance and the filtering of described amplifier, puts
Greatly.
7. the earth leakage protective intelligent tester according to claim foot 1 is it is characterised in that the monitoring of described contact state is electric
Road connects earth leakage protective device, and described contact state observation circuit is contactor deenergizing, and described contact state observation circuit includes
Photoelectrical coupler, phase inverter and some diodes and resistance.
8. earth leakage protective intelligent tester according to claim 1 is it is characterised in that described single-chip microcomputer is provided with A/D turns
Change circuit and control circuit, described current detection circuit and described contact state observation circuit respectively with described A/D change-over circuit
Electrical connection, described A/D change-over circuit electrically connected with described control circuit, described control circuit respectively with button assembly, liquid crystal
Show device, action execution unit and the electrical connection of described programmable analog leakage current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620586385.9U CN205958660U (en) | 2016-06-15 | 2016-06-15 | Intelligent tester of earth leakage protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620586385.9U CN205958660U (en) | 2016-06-15 | 2016-06-15 | Intelligent tester of earth leakage protection |
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| Publication Number | Publication Date |
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| CN205958660U true CN205958660U (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620586385.9U Expired - Fee Related CN205958660U (en) | 2016-06-15 | 2016-06-15 | Intelligent tester of earth leakage protection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710080A (en) * | 2018-08-10 | 2018-10-26 | 江苏创能电器有限公司 | Leakage analog trial jump apparatus and system |
| CN109995143A (en) * | 2019-04-24 | 2019-07-09 | 任金伟 | A kind of electric equipment safety device |
| CN113777520A (en) * | 2021-09-16 | 2021-12-10 | 浪潮商用机器有限公司 | Test method, device, system and medium for board-mounted power supply overcurrent protection |
-
2016
- 2016-06-15 CN CN201620586385.9U patent/CN205958660U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710080A (en) * | 2018-08-10 | 2018-10-26 | 江苏创能电器有限公司 | Leakage analog trial jump apparatus and system |
| CN109995143A (en) * | 2019-04-24 | 2019-07-09 | 任金伟 | A kind of electric equipment safety device |
| CN113777520A (en) * | 2021-09-16 | 2021-12-10 | 浪潮商用机器有限公司 | Test method, device, system and medium for board-mounted power supply overcurrent protection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170215 |