CN103698559B - A kind of anti-electromagnetic interference device of clamp on amperemeter - Google Patents
A kind of anti-electromagnetic interference device of clamp on amperemeter Download PDFInfo
- Publication number
- CN103698559B CN103698559B CN201310680329.2A CN201310680329A CN103698559B CN 103698559 B CN103698559 B CN 103698559B CN 201310680329 A CN201310680329 A CN 201310680329A CN 103698559 B CN103698559 B CN 103698559B
- Authority
- CN
- China
- Prior art keywords
- amperemeter
- clamp
- jaw
- halves
- shaped hollow
- 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.)
- Active
Links
- 239000002184 metal Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 5
- 230000005672 electromagnetic field Effects 0.000 description 4
- 230000001131 transforming effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A kind of anti-electromagnetic interference device of clamp on amperemeter; it comprises that one can cover the metallic shield case of clamp on amperemeter jaw; described metallic shield case comprises that two halves can cover from both sides the U-shaped hollow metal housing of clamp on amperemeter jaw; on described two halves U-shaped hollow metal housing, dispose one and cover the metal cap body of clamp on amperemeter jaw from above, and on described metal cap body, be provided with the earth connection link slot for ensureing metal screen case reliable ground; Junction between described two halves U-shaped hollow metal housing is provided with a rectangle space picking out for transformer iron core grounding down lead; It has simple in structure, easy to use, reliable, can effectively improve clamp on amperemeter anti-electromagnetic interference capability, and with Measurement accuracy iron core grounding current value, elevator belt electro-detection level, ensures the features such as power system safety and stability operation.
Description
Technical field
What the present invention relates to is a kind of anti-electromagnetic interference device of clamp on amperemeter, belongs to power measurement technical field.
Background technology
Along with taking the continuous propelling as main power transmission and transformation equipment state overhauling work with electro-detection, increasing fixed and portable charged detection technique is applied to the state-detection of power transmission and transforming equipment, and the detection that do not have a power failure becomes possibility day by day. The state estimation Data Source of electrical network power transmission and transforming equipment more and more lays particular emphasis on the result of the test with electro-detection, and therefore, the degree of accuracy with electro-detection data is particularly important. Operating iron core should be in single-point grounding state, and iron core induces electrostatic charge in alternating electric field, and down conductor will pass through alternating current. But, iron core waits iron core may have multipoint earthing because mounting process is bad, two and above earth point formation loop, and with leakage magnetic flux interlinkage, between earth point, there is the circulation that numerical value is higher, larger circulation makes iron core heating, iron core heating causes between lamination insulation degradation or Gas in Oil of Transformer is separated out, the scaling loss that insulate under high temperature, a large amount of gas evolutions, cause gas action when serious.
Can directly reflect the malfunction of transformer by measuring transformer iron core grounding current---whether there is multipoint earthing of iron core. Electrical network " power transmission and transformation equipment state overhauling testing regulations " regulation, iron core grounding current is Power transformer diagnosis test, answer < 100mA of its measured value. 2000 to 2012,9070 of Jiaxing electrical network power transmission and transforming equipment defect records, related to 841 of main transformers, and 1 of relevant iron core grounding current, for Jia Bei becomes iron core grounding current severe overweight. In power system, conventionally adopt clamp on amperemeter to carry out iron core grounding current band electro-detection.
Clamp on amperemeter operation principle mainly contains two kinds, i.e. ordinary electric current mutual-inductor type and Hall element type. The former is combined by current transformer and ammeter, and its principle is as Fig. 1. The primary winding that just becomes current transformer through circuit-under-test wire unshakable in one's determination wherein induces electric current in secondary coil by ammeter. Thereby make the ammeter that secondary coil is connected have instruction, measure the electric current of test line. Pincerlike meter common accurate is not high, is generally 2.5~5 grades. Hall element type clamp on amperemeter is also magnetic balancing current sensor, as Fig. 2. The magnetic field that the magnetic field that primary current IN produces in magnetism gathering rings place produces by a secondary current compensates, and its offset current IM reflects primary current IN accurately, thereby makes hall device in detecting the duty of zero magnetic flux.
Due to on-the-spot electromagnetic environment complexity, clamp on amperemeter is affected by electromagnetic interference, detects numerical value and has chattering, extremely unstable, affects test accuracy.
According to magnetic field Biot-Savart law:, in the situation that other factors is constant, square being inversely proportional to of the magnetic field intensity of certain point and distance. Therefore, while measuring iron core grounding current, clamp on amperemeter is subject to transformer magnetic field and strongly disturbs. Therefore, under the prerequisite of normative testing, improving accuracy in detection just must manage to make external electromagnetic field interference to be reduced to zone of reasonableness to the impact of clamp on amperemeter test accuracy.
Improve certainty of measurement and can pass through the more excellent product of buying antijamming capability, but cost is high, and this series products does not all provide the test report under strong electromagnetic interference environment.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, and provide a kind of simple in structure, easy to use, reliable, can effectively improve clamp on amperemeter anti-electromagnetic interference capability, with Measurement accuracy iron core grounding current value, elevator belt electro-detection level, the anti-electromagnetic interference device of the clamp on amperemeter of guarantee power system safety and stability operation.
The object of the invention is to complete by following technical solution, the anti-electromagnetic interference device of described clamp on amperemeter, it comprises that one can cover the metallic shield case of clamp on amperemeter jaw, described metallic shield case comprises that two halves can cover from both sides the U-shaped hollow metal housing of clamp on amperemeter jaw, on described two halves U-shaped hollow metal housing, dispose one and cover the metal cap body of clamp on amperemeter jaw from above, and on described metal cap body, be provided with the earth connection link slot for ensureing metal screen case reliable ground.
Junction between described two halves U-shaped hollow metal housing is provided with a rectangle space picking out for transformer iron core grounding down lead.
The invention belongs to the improvement to prior art, it has simple in structure, easy to use, reliable, can effectively improve clamp on amperemeter anti-electromagnetic interference capability, with Measurement accuracy iron core grounding current value, elevator belt electro-detection level, ensures the features such as power system safety and stability operation.
Brief description of the drawings
Fig. 1 is common current mutual inductive type clamp on amperemeter principle schematic described in prior art.
Fig. 2 is Hall element type clamp on amperemeter principle schematic described in prior art.
Fig. 3 is the structural representation of metallic shield case of the present invention.
Fig. 4 is metallic shield structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is done to detailed introduction: Fig. 3, shown in 4, the anti-electromagnetic interference device of clamp on amperemeter of the present invention, it comprises that one can cover the metallic shield case 2 of clamp on amperemeter jaw 1, described metallic shield case 2 comprises that two halves can cover from both sides the U-shaped hollow metal housing 3 of clamp on amperemeter jaw 1, on described two halves U-shaped hollow metal housing 3, dispose a metal cap body 4 that covers clamp on amperemeter jaw 1 from above, and on described metal cap body 4, be provided with the earth connection link slot for ensureing metal screen case reliable ground.
Junction between two halves U-shaped hollow metal housing 3 of the present invention is respectively provided with the rectangular recess of a positioned opposite, and has formed the rectangle space 5 picking out for transformer iron core grounding down lead after the docking of two rectangular recess.
Embodiment: the present invention is through the analysis of clamp on amperemeter basic test principle is drawn, employing metal material to external world electromagnetic field shields, and the electromagnetic field flow through clamp on amperemeter magnetic core and the Hall element that only allow primary coil to produce could manyly farthest reduce external electromagnetic field and disturb. Therefore, the present invention designs and produces metallic shield case and realizes reaching shield effectiveness, considers transformer iron core grounding down lead metallic plate size, therefore long 100mm is left in coated metal screen layer middle part, the space of wide 15mm, sees shown in Fig. 3,4.
Metallic shield case 2 is made up of three parts, is respectively two symmetrical U-shaped hollow metal housing 3 and metal cap bodies 4, and near hollow part wrap insulate adhesive tape, metal cap body 4 is provided with earth connection link slot to ensure metal shielding reliable ground. In the time carrying out iron core reception testing current, first open clamp on amperemeter jaw soldier and block iron core grounding downlead, two symmetrical U-shaped hollow metal housing 3 metals that then close from the side, finally cover metal cap body 4; Finally, read clamp on amperemeter reading.
Claims (2)
1. the anti-electromagnetic interference device of a clamp on amperemeter, it comprises that one can cover the metallic shield case of clamp on amperemeter jaw, it is characterized in that described metallic shield case comprises that two halves can cover from both sides the U-shaped hollow metal housing of clamp on amperemeter jaw, on described two halves U-shaped hollow metal housing, dispose one and cover the metal cap body of clamp on amperemeter jaw from above, and on described metal cap body, be provided with the earth connection link slot for ensureing metal screen case reliable ground.
2. the anti-electromagnetic interference device of clamp on amperemeter according to claim 1, is characterized in that the junction between described two halves U-shaped hollow metal housing is provided with a rectangle space picking out for transformer iron core grounding down lead.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310680329.2A CN103698559B (en) | 2013-12-13 | 2013-12-13 | A kind of anti-electromagnetic interference device of clamp on amperemeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310680329.2A CN103698559B (en) | 2013-12-13 | 2013-12-13 | A kind of anti-electromagnetic interference device of clamp on amperemeter |
Publications (2)
Publication Number | Publication Date |
---|---|
CN103698559A CN103698559A (en) | 2014-04-02 |
CN103698559B true CN103698559B (en) | 2016-05-04 |
Family
ID=50360158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201310680329.2A Active CN103698559B (en) | 2013-12-13 | 2013-12-13 | A kind of anti-electromagnetic interference device of clamp on amperemeter |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN103698559B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104297549A (en) * | 2014-09-11 | 2015-01-21 | 国家电网公司 | Flexible pliers-shaped current tester |
CN105988043B (en) * | 2015-01-30 | 2019-02-19 | 惠州市德赛西威汽车电子股份有限公司 | A kind of manipulator test macro and its test method for electromagnetic interference environment |
CN108267621A (en) * | 2018-03-22 | 2018-07-10 | 广东电网有限责任公司清远供电局 | A kind of jaw type current measurer based on Hall element |
CN110402074A (en) * | 2019-08-15 | 2019-11-01 | 国家电网有限公司 | A kind of screening arrangement suitable for clamp current transducer |
CN110940934A (en) * | 2019-12-06 | 2020-03-31 | 国网辽宁省电力有限公司检修分公司 | Transformer core clamp measuring and displaying device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656418A (en) * | 1986-01-27 | 1987-04-07 | Snap-On Tools Corporation | Molded clamp-type ammeter probe |
JPH0815321A (en) * | 1994-06-30 | 1996-01-19 | Hioki Ee Corp | Current sensor |
CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
CN103267885A (en) * | 2013-05-15 | 2013-08-28 | 河南省电力公司平顶山供电公司 | Anti-electromagnetic-interference pincers-shaped ampere meter device |
CN203630167U (en) * | 2013-12-13 | 2014-06-04 | 国家电网公司 | Electromagnetic interference-preventing device of clip-on ammeter |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5797101B2 (en) * | 2011-09-09 | 2015-10-21 | 日置電機株式会社 | Magnetic sensor and current measuring device |
-
2013
- 2013-12-13 CN CN201310680329.2A patent/CN103698559B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656418A (en) * | 1986-01-27 | 1987-04-07 | Snap-On Tools Corporation | Molded clamp-type ammeter probe |
JPH0815321A (en) * | 1994-06-30 | 1996-01-19 | Hioki Ee Corp | Current sensor |
CN101650403A (en) * | 2009-09-15 | 2010-02-17 | 重庆大学 | Current sensor for polluted insulator leakage of AC high-voltage electric transmission line |
CN103267885A (en) * | 2013-05-15 | 2013-08-28 | 河南省电力公司平顶山供电公司 | Anti-electromagnetic-interference pincers-shaped ampere meter device |
CN203630167U (en) * | 2013-12-13 | 2014-06-04 | 国家电网公司 | Electromagnetic interference-preventing device of clip-on ammeter |
Also Published As
Publication number | Publication date |
---|---|
CN103698559A (en) | 2014-04-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103698559B (en) | A kind of anti-electromagnetic interference device of clamp on amperemeter | |
CA2800551C (en) | Method and apparatus for detecting a magnetic characteristic variable in a core | |
CN106950441B (en) | A kind of sensor for on-line checking transformer DC magnetic bias | |
CN103063895B (en) | Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system | |
CN203191419U (en) | Intelligent electricity meter with diamagnetic structured electromagnetic current transformers | |
CN109975595B (en) | Leakage current sensor and device for resisting interference of power frequency magnetic field | |
Zhu et al. | Energization-status identification of three-phase three-core shielded distribution power cables based on non-destructive magnetic field sensing | |
CN112034230B (en) | Current sensor with spiral shielding shell | |
CN102435813B (en) | A kind of method for collecting current on low-voltage side of electric furnace transformer and protective relaying device | |
CN203084013U (en) | Current detection calliper | |
CN205120840U (en) | Near field magnetoelectric sensor | |
CN203630167U (en) | Electromagnetic interference-preventing device of clip-on ammeter | |
CN212568918U (en) | Electronic current sensor with error self-checking function | |
CN206311657U (en) | A kind of Rogowski coil transient current sensor | |
KR20150108955A (en) | Switchboard For Measuring Current And Electric Power By Magnetic Field | |
EP2948779B1 (en) | Flexible magnetic field sensor | |
CN110836987B (en) | Manganese-copper shunt of three-phase intelligent electric energy meter and application thereof | |
JP2014085248A (en) | Current sensor and current detection method | |
CN104714070A (en) | Current sensor adopting differential coil structure | |
CN103575959B (en) | Novel non-contact three-phase current measuring method | |
CN107478886B (en) | Current sensor and method for detecting current signal thereof | |
CN203350337U (en) | Current sensor | |
CN204228880U (en) | A kind of residual current transformer | |
CN212568917U (en) | Electronic current sensor for electric energy meter | |
CN204495860U (en) | A kind of transformer belt pyroelectric monitor instrument energy taking device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant |