CN202422986U - Low current detection mutual inductor for suppressing power frequency electromagnetic interference - Google Patents
Low current detection mutual inductor for suppressing power frequency electromagnetic interference Download PDFInfo
- Publication number
- CN202422986U CN202422986U CN2011205463961U CN201120546396U CN202422986U CN 202422986 U CN202422986 U CN 202422986U CN 2011205463961 U CN2011205463961 U CN 2011205463961U CN 201120546396 U CN201120546396 U CN 201120546396U CN 202422986 U CN202422986 U CN 202422986U
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- iron core
- cavity shell
- high conductivity
- power frequency
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Abstract
The utility model relates to a low current detection mutual inductor for suppressing power frequency electromagnetic interference, and belongs to the technical field of detectors. According to the technical field, the low current detection mutual inductor comprises a high-conductivity cavity shell (1), an insulation filling material (2) and an electromagnetic compatible (EMC) iron core (3), wherein the EMC iron core is fixed in the high-conductivity cavity shell; the insulation filling material is positioned between the EMC iron core and the high-conductivity cavity shell; a rectangular window is formed on the high-conductivity cavity shell; a central window overlapped with the rectangular window is formed on the EMC iron core; a fixing hole (5) and a fixing piece are arranged on two sides at the front end of the high-conductivity cavity shell; and the high-conductivity cavity shell is grounded through the fixing piece. Static electricity interference is shielded by the cavity shell made of a high-conductivity material and the high grounding; static magnetic interference is shielded by a shielding body made of a high magnetic conduction material; the magnetism of the EMC iron core is protected by the anti-impact shell and the insulation filling material; and therefore, the reliability of the low current detection mutual inductor is further improved.
Description
Technical field
The utility model relates to a kind of weak current that suppresses the power frequency electromagnetic interference and detects instrument transformer, belongs to the detecting instrument technical field.
Background technology
Current transformer is the common current sensing means of industry spot.At present, generally be employed in coiling on the annular core both at home and abroad, the method for outer coating insulation material is produced current transformer.Can know that from the design feature and the handling characteristics of current transformer the electromagnetic interference energy that influences the current transformer certainty of measurement mainly is coupled through radiativity and transmits.The radiativity coupling mainly comprises three kinds of modes, wherein electrostatic interference and magnetostatic interference having the greatest impact to certainty of measurement.The current transformer product of background technology much can reach higher certainty of measurement under the environment of no electromagnetic interference.But in the environment that electrostatic interference and magnetostatic interference are arranged, its measured value can produce certain deviation, and especially when measured signal is power frequency weak current signal, measured value will depart from actual current value far away, can't guarantee certainty of measurement.
The utility model content
The purpose of the utility model provides a kind of weak current that suppresses the power frequency electromagnetic interference and detects instrument transformer, can suppress the power frequency electromagnetic interference, under complex environment, accurately measures power frequency weak current signal, solves the problems referred to above that background technology exists.
The technical scheme of the utility model is: the weak current that suppresses the power frequency electromagnetic interference detects instrument transformer; Comprise high conductivity cavity shell, insulation filling material and EMC iron core; The EMC iron core is fixed on high conductivity cavity enclosure, and insulation filling material is between EMC iron core and high conductivity shell.
Said high conductivity cavity shell upper and lower surfaces is provided with rectangular window; The EMC iron core also is provided with the center window that overlaps with it; Circuit to be detected window thus passes, and high conductivity cavity shell front end both sides are provided with fixing hole, fixture, and high conductivity cavity shell is through fixture ground connection.
Said EMC iron core coated outside high permeability materials, EMC iron core outermost layer twines the high-temperature insulation adhesive tape.
High conductivity cavity shell front end is provided with the metal water joint, and the outlet of EMC iron core is drawn from the metal water joint.High conductivity cavity shell is provided with sealing plate, and sealing plate is fixed with straight pin.
The beneficial effect of the utility model is: cavity shell and good earth shielding electrostatic interference that the utility model is made through using high conductivity material; The shield that the weak current detection instrument transformer of inhibition power frequency electromagnetic interference is manufactured through high permeability materials shields magnetostatic interference, and relies on shock resistance shell and insulation filling material protection EMC iron core magnetic, further improves the reliability of the utility model.
Description of drawings
Fig. 1 is the external structure sketch map of the utility model;
Fig. 2 is the internal structure sketch map of the utility model;
Among the figure: 1, high conductivity cavity shell, 2, insulation filling material, 3, the EMC iron core, 4, the metal water joint, 5, fixing hole, 6, straight pin.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further through embodiment.
The weak current that suppresses the power frequency electromagnetic interference detects instrument transformer, comprises high conductivity cavity shell 1, insulation filling material 2 and EMC iron core 3, and the EMC iron core is fixed on high conductivity cavity enclosure, and insulation filling material is between EMC iron core and high conductivity shell.Said high conductivity cavity shell upper and lower surfaces is provided with rectangular window; The EMC iron core also is provided with the center window that overlaps with it; Circuit to be detected window thus passes, and high conductivity cavity shell front end both sides are provided with fixing hole 5, fixture, and high conductivity cavity shell is through fixture ground connection.
Said EMC iron core coated outside high permeability materials, EMC iron core outermost layer twines the high-temperature insulation adhesive tape.
High conductivity cavity shell front end is provided with metal water joint 4, and the outlet of EMC iron core is drawn from the metal water joint.High conductivity cavity shell is provided with sealing plate, and sealing plate is fixed with straight pin 6.
The operation principle of the utility model: electrostatic interference is mainly from electrostatic field and low-frequency alternating electric field, and through electrostatic field induction effect and magnetostatic field coupling, influences the magnetic flux in the current transformer, and then makes and export induced current generation deviation.To this problem, this device uses high conductivity material to make shell, and shell is through the fixing hole good earth.Can make the electrostatic interference and the most magnetostatic interference of this device shielding overwhelming majority in this way.Mainly from steady current, permanent magnet and low-frequency alternating current field, this interference directly acts on magnetic flux unshakable in one's determination in magnetostatic interference, disturbs the output induced current.To this problem, this device uses high permeability materials to make the iron core shield.Influence shield magnetic screen usefulness be not shield ground connection whether, but shield conduction continuity.The shield of the utility model design adopts loop structure, only in the inboard 1cm slit that keeps of iron core, as tested current flux path.This design can farthest guarantee the conduction continuity of shield, shields above-mentioned magnetostatic interference.Simultaneously, consider that high permeability materials can greatly lose magnetic under the condition of mechanical shock, cause screening effectiveness to descend.The high conductivity material physical strength that this device making shell is used is big, shock resistance, and the cushioning effect of passing through insulation filling material again can well be protected the EMC iron core, has further strengthened the stability of this device.
Claims (4)
1. a weak current that suppresses the power frequency electromagnetic interference detects instrument transformer; It is characterized in that: comprise high conductivity cavity shell (1), insulation filling material (2) and EMC iron core (3); The EMC iron core is fixed on high conductivity cavity enclosure, and insulation filling material is between EMC iron core and high conductivity shell.
2. the weak current according to the said inhibition power frequency electromagnetic interference of claim 1 detects instrument transformer; It is characterized in that: said high conductivity cavity shell upper and lower surfaces is provided with rectangular window; The EMC iron core also is provided with the center window that overlaps with it; High conductivity cavity shell front end both sides are provided with fixing hole (5), fixture, and high conductivity cavity shell is through fixture ground connection.
3. the weak current according to claim 1 or 2 said inhibition power frequency electromagnetic interference detects instrument transformer, it is characterized in that: said EMC iron core coated outside high permeability materials, EMC iron core outermost layer twines the high-temperature insulation adhesive tape.
4. the weak current according to claim 1 or 2 said inhibition power frequency electromagnetic interference detects instrument transformer, and it is characterized in that: high conductivity cavity shell front end is provided with metal water joint (4), and the outlet of EMC iron core is drawn from the metal water joint; High conductivity cavity shell is provided with sealing plate, and sealing plate is fixed with straight pin (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205463961U CN202422986U (en) | 2011-12-23 | 2011-12-23 | Low current detection mutual inductor for suppressing power frequency electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205463961U CN202422986U (en) | 2011-12-23 | 2011-12-23 | Low current detection mutual inductor for suppressing power frequency electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202422986U true CN202422986U (en) | 2012-09-05 |
Family
ID=46747722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205463961U Expired - Fee Related CN202422986U (en) | 2011-12-23 | 2011-12-23 | Low current detection mutual inductor for suppressing power frequency electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202422986U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849725A (en) * | 2015-05-22 | 2015-08-19 | 广州杰赛科技股份有限公司 | Positioning and tracking device, and positioning and tracking system |
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
-
2011
- 2011-12-23 CN CN2011205463961U patent/CN202422986U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849725A (en) * | 2015-05-22 | 2015-08-19 | 广州杰赛科技股份有限公司 | Positioning and tracking device, and positioning and tracking system |
| CN106338628A (en) * | 2016-11-16 | 2017-01-18 | 中国电子科技集团公司第四十研究所 | Protection device for power-frequency interference of broadband microwave access |
| CN106338628B (en) * | 2016-11-16 | 2019-03-01 | 中国电子科技集团公司第四十一研究所 | A kind of protective device of wide-band microwave access Hz noise |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20131223 |