CN201247300Y - Non-contact DC/AC leakage current tester - Google Patents
Non-contact DC/AC leakage current tester Download PDFInfo
- Publication number
- CN201247300Y CN201247300Y CNU2008201888231U CN200820188823U CN201247300Y CN 201247300 Y CN201247300 Y CN 201247300Y CN U2008201888231 U CNU2008201888231 U CN U2008201888231U CN 200820188823 U CN200820188823 U CN 200820188823U CN 201247300 Y CN201247300 Y CN 201247300Y
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Abstract
The utility model relates to a non-contact double current leakage current tester, which is provided with a detection binding clip. A CPU, a pulse modulation oscillating discharge circuit, an integral amplifying filtering zeroing output feedback circuit, a double current switching sampling control circuit, a feedback balance amplifying circuit, an alternating current leakage current amplifying detecting circuit and a power supply control output circuit are arranged in the non-contact double current leakage current tester, wherein the CPU is connected with the power supply control output circuit, signals of the CPU are delivered to a coil which is arranged on the detection binding clip through the pulse modulation oscillating discharge circuit, signals of the coil are respectively delivered to the CPU and the feedback coil which is arranged on the detection binding clip through the integral amplifying filtering zeroing output feedback circuit, singles of the feedback coil are delivered to the CPU through the double current switching sampling control circuit and the feedback balance amplifying circuit, and signals of a third coil arranged on the detection binding clip are delivered to the CPU through the double current switching sampling control circuit and the alternating current leakage current amplifying detecting circuit. The utility model has the advantages of high measuring precision, simple operation, safe use and the like.
Description
Technical field
The utility model relates to the leakage current field tests, specifically, relate to a kind ofly be used to exchange, the direct current power supply-distribution system over the ground the alternating current-direct current leakage current measurement or be used for the contactless alternating current-direct current leakage current tester of the direct measurement of AC and DC.
Background technology
Be accompanied by the develop rapidly of modern industry, in fields such as electric power, telecommunications, military affairs, railway, meteorology, aviation, oil field, buildings, safety requirements to the alternating current-direct current power supply-distribution system is more and more higher, and especially the requirement aspect the leakage current measurement of system over the ground is strict especially.
At present, traditional leakage current measurement has generally adopted the electromagnetic coupled principle, has for example adopted current transformer, but because problem such as processing technology, thus be good at guaranteeing precision and the accuracy measured, simultaneously, its cost height.Traditional DC leakage current checkout equipment is general to adopt closed perforation structure, and when concrete the use, its must trip circuit of prediction allows this circuit punching and mistake, or is installed in advance on the circuit that needs monitoring, just can detect.Because many electric power systems do not allow to have a power failure and detect, therefore, on this type of electric power system, just be not easy to use traditional DC leakage current checkout equipment, so restricted application of traditional DC leakage current checkout equipment, in addition, adopt traditional DC leakage current checkout equipment to detect and also have problems such as use is dangerous, inconvenient, waste labour.Traditional DC leakage current checkout equipment need contact and can measure, and promptly the user need be connected on checkout equipment in the tested circuit and can measure, and at this moment, relates to problems such as the prediction circuit of triping again, and the use of checkout equipment is restricted again, and is dangerous; Traditional DC leakage current checkout equipment, its electric current split-core type meter all has exposed metal iron core or input and output connection terminal, and it is manipulated and has potential safety hazard.In addition, traditional embedded two iron cores of closed perforation DC leakage current checkout equipment, cost is high relatively, and is heavy again, and it can only install with equipment, belongs in line style more, do not have to transplant property is installed, and want the installation of each point separate configurations, uneconomical.
The utility model content
Technical problem to be solved in the utility model provides a kind of measuring accuracy height, contactless alternating current-direct current leakage current tester simple to operate, safe in utilization.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of contactless alternating current-direct current leakage current tester comprises detector, it is characterized in that:
This detector has the detection binding clip that is used for clamping test line;
In detector, be provided with:
CPU; The pulsed modulation oscillator-amplification circuit; Integration amplification filtering zeroing output feedback circuit; Alternating current-direct current switches the sampling control circuit, is used for switching between DC leakage current pattern and ac leakage stream mode; The feedback equalization amplifying circuit; Ac leakage is banished big detecting circuit; The power supply controlling output circuit is used for realizing start or shutdown;
Described CPU is connected with the power supply controlling output circuit;
Be transferred to behind the output signal pulse modulated oscillator-amplification circuit of described CPU and be located at the coil T1 that detects on the binding clip, the output signal of this coil T1 is transferred to CPU respectively and is located at the tickler T2 that detects on the binding clip behind integration amplification filtering zeroing output feedback circuit, and the output signal of tickler T2 is transferred to CPU after alternating current-direct current switches sampling control circuit, feedback equalization amplifying circuit; Be located at the output signal that detects the tertiary coil T3 on the binding clip and be transferred to CPU after banishing big detecting circuit through alternating current-direct current switching sampling control circuit, ac leakage.
Described detection binding clip is pincerlike opening shape.
Described detection binding clip is the binding clip that quadric injection mould forms.
The utility model also comprises warning circuit, and this warning circuit is connected with CPU.
The utility model also includes display circuit, and this display circuit is connected with CPU.
Described display circuit is provided with HTN type blue screen LCD.
The utility model is owing to having adopted technique scheme, so it has following beneficial effect:
1), in the utility model, pass through CPU, the pulsed modulation oscillator-amplification circuit, integration amplification filtering zeroing output feedback circuit, alternating current-direct current switches the sampling control circuit, the feedback equalization amplifying circuit, ac leakage is banished the cooperating of circuit such as big detecting circuit, by adopting magnetic balance modulation technique, the utility model can reach the magnetic field of outer DC current generation to the loss that electromagnetic coupled causes and carry out balanced compensated, the position of test line in tested binding clip is also unaffected, do not disturb simultaneously test line, measure more accurately and reliably, wherein the modulating pulse source is by CPU control output, there is not deviation in frequency stabilization, and the accuracy of measurement is reliable;
2), detecting binding clip is the binding clip that quadric injection mould forms, promptly detect binding clip and adopted pincerlike opening mode, by pressing the trigger in the detector of the present utility model, can control the opening and closing of jaw, thereby the clamp test line does not need test line is triped, real once pincers know, it is quick to save time, and has improved yield-power greatly;
3), described detection binding clip moulds the binding clip that forms for secondary system, promptly detect binding clip and adopted quadric injection mould, no bare metal conductor, non-cpntact measurement has ensured operating personnel's personal safety conscientiously, has avoided unnecessary economic loss;
4), detector can adopt single magnet ring, can realize the alternating current-direct current dual-purpose measurement of leaking electricity, cost is low, light weight;
5), employing HTN type blue screen LCD shows that very luxurious directly perceived, convenient dim place and night test;
6), the utility model also has the data interlock memory function, critical value setting sound and light of alarm, peak-value-holding function, the low prompting of battery electric quantity and the function of shutting down automatically;
7), the utility model is provided with multichannel sampling, in conjunction with the advanced algorithm of CPU, realizes that the ac and dc current from 1uA to 3000A or the high precision wide range of leakage current measure;
8), the power supply controlling output circuit adopted the button cell power supply of 2 1.5V, at the bottom of the power consumption utmost point, hand-held detects, and is exquisite convenient;
9), the utility model can be used for all interchanges, direct current power supply-distribution system alternating current-direct current leakage current measurement over the ground, also can be used for the direct measurement of AC and DC electric current, can carry out non-contact measurement from 1uA high sensitivity, high precision, high stability, interference-free, exquisite fuselage, exquisite light, sophisticated technologies, with low cost are suitable for producing in enormous quantities and use;
In a word, the utlity model has low cost, high precision, high stable, characteristics such as multi-functional, simple to operate, safe and practical.
Below in conjunction with the drawings and specific embodiments the utility model is further narrated, but not as to qualification of the present utility model.
Description of drawings
Fig. 1 is the circuit block diagram of embodiment of the present utility model;
Fig. 2 is the circuit theory diagrams of embodiment of the present utility model;
Fig. 3 is the structural representation of embodiment of the present utility model.
Embodiment
As shown in Figure 1, it is the circuit block diagram of present embodiment.A kind of contactless alternating current-direct current leakage current tester comprises detector 1, and this detector 1 has the detection binding clip 2 that is used for vising test line, sees Fig. 3.This detects binding clip 2 is pincerlike opening shape, and it is moulded for secondary system and forms simultaneously.On detector 1, be provided with trigger, control the opening and closing of jaw by operating trigger.In detector 1, be provided with: CPU, the pulsed modulation oscillator-amplification circuit, integration amplification filtering zeroing output feedback circuit, alternating current-direct current switches sampling control circuit, feedback equalization amplifying circuit; Ac leakage is banished big detecting circuit; The power supply controlling output circuit.CPU is connected with the power supply controlling output circuit.Be transferred to behind the output signal pulse modulated oscillator-amplification circuit of CPU and be located at the coil T1 that detects on the binding clip 2, the output signal of this coil T1 is transferred to CPU respectively and is located at the tickler T2 that detects on the binding clip 2 behind integration amplification filtering zeroing output feedback circuit, and the output signal of tickler T2 is transferred to CPU after alternating current-direct current switches sampling control circuit, feedback equalization amplifying circuit; Be located at the output signal that detects the tertiary coil T3 on the binding clip 2 and export to CPU after banishing big detecting circuit through alternating current-direct current switching sampling control circuit, ac leakage.
As shown in Figure 2, it is the circuit theory diagrams of present embodiment.Circuit theory diagrams below in conjunction with present embodiment are described further present embodiment.
CPU：
CPU is made up of chip U3, capacitor C 8, capacitor C 9, quartz crystal unit XT etc., and chip U3 can select the extensive integrated IC of low-power consumption for use, and capacitor C 8, capacitor C 9, quartz crystal unit XT are connected with OS1, the OS2 end of chip U3, are used to provide oscillation frequency.Stabilivolt Z, resistance R 23, resistance R 24, capacitor C 7 are connected with the A5 end of chip U3, provide reference data for CPU carries out A/D.Button S3 is connected with the B4 end of chip U3.When weak point is pressed (being no more than 3 seconds) S3, be used to switch different measurement patterns, when length is pressed (above 3 seconds) S3, can lock video data, and these data are stored function such as in addition, button S3 and button S1 are used in combination can also realize data setting, consult, removing as one group of automatic numbering.The B6 of chip U3, B7 end is connected with the pulsed modulation oscillator-amplification circuit, B6, B7 end output pulsed modulation source.The A0 of chip U3～A2 port is the detection limit of alternating current-direct current leakage current and the input end of magnetic balance modulation voltage.The A3 of chip U3, A4 end is connected with the power supply controlling output circuit for the input/output terminal of power supply control, and wherein A3 port and B4 port are used in combination function, promptly can realize the effect that is used in combination of button S3 and button S1.The B0 port output acoustic alarm signal of chip U3 is connected with resistance R 27, and sound alarm circuit is made up of resistance R 27, hummer SP etc.The A6 port of chip U3 connects resistance R 28, and resistance R 28 is formed the measurement pattern commutation circuit with triode T4, diode D4 and relay K A.
The pulsed modulation oscillator-amplification circuit:
The pulsed modulation oscillator-amplification circuit is given in the B6 of chip U3, B7 end output pulsed modulation source, forms driving source with the coil T1 that detects on the binding clip 2.Pulsed modulation oscillator-amplification circuit element comprises: resistance R 1～R4, comparer A1, coil T1 etc.In the present embodiment, comparer A1～A6 selects for use the military project level to hang down the little power consumption amplifier of power supply.When having DC current I to pass through in detecting binding clip 2, the direct current offset magnetic potential will change the modulating pulse waveform of coil T1, and the waveform after the change is connected to integration amplification filtering zeroing output feedback circuit by the C tap of coil T1.
Integration amplification filtering zeroing output feedback circuit:
Integration amplification filtering zeroing output feedback circuit is made up of resistance R 5～R11, capacitor C 1～C4, adjustable resistance RW, comparer A2, A3, relay switch KA-1, tickler T2.The waveform of coil T1 output is through amplifications such as comparer A2, after capacitor C 2, resistance R 7, capacitor C 3 filtering, take out and the relevant amount of direct current offset magnetic potential size, pass through amplification filtering such as comparer A3 again, give A0 port and the tickler T2 of chip U3, be convenient to CPU and handle computing.
Alternating current-direct current switches the sampling control circuit:
Present embodiment is designed to the dual-purpose measurement of alternating current-direct current leakage current, independent operation S3 button, and two kinds of signals of the exportable height of the A6 port of chip U3 are by the power failure state that gets of triode T4 pilot relay KA coil.During normal boot-strap, present embodiment enters the DC leakage current pattern of measuring automatically, the A6 port output low signal of chip U3, i.e. and relay switch KA-1 closure, relay switch KA-2 is in the I end, and relay switch KA-3 disconnects.When pressing the S3 button, the A6 port of chip U3 is exported high signal, triode T4 conducting, and relay K A coil gets electric, and KA-1 disconnects, and KA-2 connects the H end, and relay switch KA-3 connects, and transfers the ac leakage stream mode to and tests.The common port COM2 of rotary switch KB is connected with the common port COM1 of relay K A, access point as sampling, rotate described rotary switch KB, can make 1～5 termination of common port COM2 and rotary switch KB logical respectively, promptly by inserting different sample resistances, resistance R 01～R05 in the different sample resistance corresponding diagram, thus realize that 5 grades (300uA, 3mA, 300mA, 30A, 3000A) measures.In addition, present embodiment also can realize gear switch with CPU software control circuit, and does not influence protection domain of the present utility model.
The feedback equalization amplifying circuit:
When measuring DC leakage current, by tickler T2, amount after the sampling enters the feedback equalization amplifying circuit that resistance R 12～R15, comparer A4 form, send into the A1 port of CPU again, CPU revises the amount that enters the A0 port automatically according to this amount, make the displayed value of present embodiment consistent, make the displayed value true and accurate with the actual leakage current of passing detection binding clip 2.
Ac leakage is banished big detecting circuit:
It is to measure according to the electromagnetic coupled principle that ac leakage stream detects, mainly respond to by tertiary coil T3, the sample of signal of sensing is after enter the A2 port of CPU behind relay switch KA-3, resistance R 16～R22, capacitor C 5, C6, C14, comparer A5, A6, the amplification demodulators such as diode D1, D2, CPU shows reflection ac leakage flow valuve through calculation process again.
The power supply controlling output circuit:
The power supply controlling output circuit is made up of power supply VCC, triode T1, T2, capacitor C 10～capacitor C 13, chip U1, chip U2, switch S 1, resistance R 25, R26, VCC is the button cell of 2 1.5V, triode T1 is a switching tube, and chip U1, U2 are respectively positive and negative conversion output voltage stabilizing IC.When lacking by S1 (being no more than 3 seconds), CPU wakes up from dormancy, high signal of A4 port output, receive triode T2 through resistance R 25, make triode T2 conducting, the base voltage of triode T1 is dragged down, triode T1 opens and exports cell voltage and gives chip U1, chip U1, U2 output obtains generating positive and negative voltage power supply road work, realizes start.The long S2 (above 3 seconds) that presses, low signal of A4 port output of CPU, triode T2 ends, and the base voltage of triode T1 uprises, and triode T1 disconnects no-output, finishes shutdown, and CPU enters dormant state.Present embodiment has automatic shutdown function, when start work shutdown automatically after 5 minutes, to reduce battery consumption.
Display circuit:
Display circuit is connected with B1～B3 port of CPU by serial communication mode, and wherein display circuit is provided with HTN type blue screen LCD.
Warning circuit:
In the present embodiment, warning circuit is a sound alarm circuit, and this sound alarm circuit is made up of resistance R 27, hummer SP etc., can certainly adopt optical alarm circuit etc., and does not influence protection domain of the present utility model.The B0 port output acoustic alarm signal of its chips U3 is connected with resistance R 27.
Detect binding clip 2:
Detecting binding clip 2 can be made up of singlecore, shielding box etc., make by the quadric injection mould processing technology, its M-N section and whole binding clip all do not have the bare metal conductor, have improved the security of measuring greatly, have ensured operating personnel's personal safety and unnecessary economic loss conscientiously.
As required, present embodiment can independently be produced to only measuring DC leakage current or only measuring the split-core type meter that ac leakage flows, promptly single pincerlike contactless interchange or DC leakage current tester; Perhaps, the client do not influence protection domain of the present utility model for providing the pincerlike leakage current testing sensor of online noncontact.
In a word; though described embodiment of the present utility model in conjunction with the accompanying drawings; but those skilled in the art can make various distortion or modification within the scope of the appended claims; as long as be no more than the described protection domain of claim of the present utility model, all should be within protection domain of the present utility model.
Claims (6)
1, a kind of contactless alternating current-direct current leakage current tester comprises detector, it is characterized in that:
This detector has the detection binding clip that is used for clamping test line;
In detector, be provided with:
CPU; The pulsed modulation oscillator-amplification circuit; Integration amplification filtering zeroing output feedback circuit; Alternating current-direct current switches the sampling control circuit; The feedback equalization amplifying circuit; Ac leakage is banished big detecting circuit; The power supply controlling output circuit is used for realizing start or shutdown;
Described CPU is connected with described power supply controlling output circuit;
Be transferred to behind the output signal pulse modulated oscillator-amplification circuit of described CPU and be located at the coil (T1) that detects on the binding clip, the output signal of this coil (T1) is transferred to CPU respectively and is located at the tickler (T2) that detects on the binding clip behind integration amplification filtering zeroing output feedback circuit, and the output signal of tickler (T2) is transferred to CPU after alternating current-direct current switches sampling control circuit, feedback equalization amplifying circuit; Be located at the output signal that detects the tertiary coil (T3) on the binding clip and be transferred to CPU after banishing big detecting circuit through alternating current-direct current switching sampling control circuit, ac leakage.
2, contactless alternating current-direct current leakage current tester according to claim 1, it is characterized in that: described detection binding clip is pincerlike opening shape.
3, contactless alternating current-direct current leakage current tester according to claim 1 and 2, it is characterized in that: described detection binding clip is the binding clip that quadric injection mould forms.
4, contactless alternating current-direct current leakage current tester according to claim 1, it is characterized in that: also comprise warning circuit, this warning circuit is connected with CPU.
5, contactless alternating current-direct current leakage current tester according to claim 1, it is characterized in that: also include display circuit, this display circuit is connected with CPU.
6, contactless alternating current-direct current leakage current tester according to claim 5, it is characterized in that: described display circuit is provided with HTN type blue screen LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201888231U CN201247300Y (en) | 2008-08-19 | 2008-08-19 | Non-contact DC/AC leakage current tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201888231U CN201247300Y (en) | 2008-08-19 | 2008-08-19 | Non-contact DC/AC leakage current tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201247300Y true CN201247300Y (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201888231U Expired - Fee Related CN201247300Y (en) | 2008-08-19 | 2008-08-19 | Non-contact DC/AC leakage current tester |
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| Country | Link |
|---|---|
| CN (1) | CN201247300Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081117A (en) * | 2010-12-14 | 2011-06-01 | 大庆百米马流体控制系统有限公司 | Pumping unit power hand-held test instrument and application method thereof |
| CN105547334A (en) * | 2015-12-15 | 2016-05-04 | 重庆梅安森科技股份有限公司 | Multi-shift sensor |
-
2008
- 2008-08-19 CN CNU2008201888231U patent/CN201247300Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081117A (en) * | 2010-12-14 | 2011-06-01 | 大庆百米马流体控制系统有限公司 | Pumping unit power hand-held test instrument and application method thereof |
| CN102081117B (en) * | 2010-12-14 | 2015-07-08 | 大庆百米马流体控制系统有限公司 | Pumping unit power hand-held test instrument and application method thereof |
| CN105547334A (en) * | 2015-12-15 | 2016-05-04 | 重庆梅安森科技股份有限公司 | Multi-shift sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU YITAI ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: LUAN HAODONG Effective date: 20090904 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090904 Address after: B, North Industrial Zone, north of Baiyun Avenue, Baiyun District, Guangdong, Guangzhou Province, 510440, Jixian Patentee after: ETCR Electronic Technology Company Address before: Room 301, Guangdong science and Technology Department building, 171 Xin Xin Road, Guangdong, Guangzhou Province, China: 510040 Patentee before: Luan Haodong |
|
| C56 | Change in the name or address of the patentee |
Owner name: GUANGZHOU YITAI ELECTRONIC TECHNOLOGY CO., LTD. Free format text: NEW ADDRESS: NO.2, YAJUYUEBANSHANHAOTINGCUIYUN TWO STREET, NO.1168, TONGHE ROAD, BAIYUN DISTRICT, GUANGZHOU CITY, GUANGDONG PROVINCE, ZIP CODE:510515 |
|
| CP02 | Change in the address of a patent holder |
Address after: Two street 1168 agile mid villa Chui City Baiyun District of Guangzhou City, Guangdong Province, and the same road No. 2, zip code: 510515 Patentee after: ETCR Electronic Technology Company Address before: B, North Industrial Zone, north of Baiyun Avenue, Baiyun District, Guangdong, Guangzhou Province, 510440, Jixian Patentee before: ETCR Electronic Technology Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20140819 |
|
| EXPY | Termination of patent right or utility model |