CN103698559A - Electromagnetic interference prevention device for tong type ammeter - Google Patents
Electromagnetic interference prevention device for tong type ammeter Download PDFInfo
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- CN103698559A CN103698559A CN201310680329.2A CN201310680329A CN103698559A CN 103698559 A CN103698559 A CN 103698559A CN 201310680329 A CN201310680329 A CN 201310680329A CN 103698559 A CN103698559 A CN 103698559A
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- electromagnetic interference
- amperemeter
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- type ammeter
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Abstract
The invention provides an electromagnetic interference prevention device for a tong type ammeter. The electromagnetic interference prevention device comprises a metal shielding cover case capable of covering the tong type ammeter, wherein the metal shielding cover case comprises two halves of U-shaped hollow metal casings capable of covering jaws of the tong type ammeter from the two sides, a metal cap body covering the jaws of the tong type ammeter from the upper side is arranged above the two halves of the U-shaped hollow metal casing, in addition, a grounding wire connecting groove capable of ensuring the reliable grounding of the metal shielding casing is formed in the metal cap body, and a connecting part between the two halves of U-shaped hollow metal casings is provided with a rectangular gap used for connecting out a grounding lead-out wire of a transformer iron core. The electromagnetic interference prevention device has the characteristics that the structure is simple, the use is convenient and reliable, the electromagnetic interference resistance capability of the tong type ammeter can be effectively improved, the grounding current value of an iron core can be accurately measured, the charged detection level is improved, the safe and stable operation of an electric power system can be ensured, and the like.
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 take 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 not having a power failure to detect 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 test findings with electro-detection, therefore, particularly important with the accuracy of electro-detection data.Operating iron core should be in single-point grounding state, and iron core induces static charge in alternating electric field, and down conductor will pass through alternating current.Yet, iron core waits iron core may have multipoint earthing because mounting process is bad, two and above earth point formation loop, and with leakage 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.
The malfunction that can directly reflect 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, and its measured value is answered <100mA.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 electric system, conventionally adopt clamp on amperemeter to carry out iron core grounding current band electro-detection.
Clamp on amperemeter principle of work mainly contains two kinds, i.e. ordinary electric current mutual-inductor type and Hall element type.The former is combined by current transformer and reometer, 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 reometer.Thereby make the reometer that secondary coil is connected have indication, 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.
Because on-the-spot electromagnetic environment is complicated, clamp on amperemeter is affected by electromagnetic interference, detects numerical value and has jump phenomena, 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.While therefore 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 measuring accuracy 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 assurance 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 from above, cover the metal cap body of clamp on amperemeter jaw, and on described metal cap body, be provided with for guaranteeing the ground wire link slot of 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, guarantees the features such as power system safety and stability operation.
Accompanying drawing explanation
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.
Embodiment
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 for guaranteeing the ground wire link slot of 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 only allow electromagnetic field that primary coil produces flow through clamp on amperemeter magnetic core and Hall element, 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 sheet metal size, therefore long 100mm is left in coated metal screen layer middle part, the space of wide 15mm, sees shown in Fig. 3,4.
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 from above, cover the metal cap body of clamp on amperemeter jaw, and on described metal cap body, be provided with for guaranteeing the ground wire link slot of 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310680329.2A CN103698559B (en) | 2013-12-13 | 2013-12-13 | A kind of anti-electromagnetic interference device of clamp on amperemeter |
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| CN103698559A true CN103698559A (en) | 2014-04-02 |
| CN103698559B CN103698559B (en) | 2016-05-04 |
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| CN201310680329.2A Active CN103698559B (en) | 2013-12-13 | 2013-12-13 | A kind of anti-electromagnetic interference device of clamp on amperemeter |
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Cited By (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 |
| CN105988043A (en) * | 2015-01-30 | 2016-10-05 | 惠州市德赛西威汽车电子股份有限公司 | Manipulator test system applicable to electromagnetic interference environment and test method thereof |
| CN108169539A (en) * | 2018-03-22 | 2018-06-15 | 广东电网有限责任公司清远供电局 | A kind of tong-type ammeter based on Hall effect |
| 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 (6)
| 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 |
| US20130063140A1 (en) * | 2011-09-09 | 2013-03-14 | Hioki Denki Kabushiki Kaisha | Magnetic sensor and current measuring apparatus |
| 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 |
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2013
- 2013-12-13 CN CN201310680329.2A patent/CN103698559B/en active Active
Patent Citations (6)
| 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 |
| US20130063140A1 (en) * | 2011-09-09 | 2013-03-14 | Hioki Denki Kabushiki Kaisha | Magnetic sensor and current measuring apparatus |
| 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 |
Cited By (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 |
| CN105988043A (en) * | 2015-01-30 | 2016-10-05 | 惠州市德赛西威汽车电子股份有限公司 | Manipulator test system applicable to electromagnetic interference environment and test method thereof |
| CN108169539A (en) * | 2018-03-22 | 2018-06-15 | 广东电网有限责任公司清远供电局 | A kind of tong-type ammeter based on Hall effect |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN103698559B (en) | 2016-05-04 |
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