CN203350337U - Current sensor - Google Patents

Current sensor Download PDF

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Publication number
CN203350337U
CN203350337U CN 201320439613 CN201320439613U CN203350337U CN 203350337 U CN203350337 U CN 203350337U CN 201320439613 CN201320439613 CN 201320439613 CN 201320439613 U CN201320439613 U CN 201320439613U CN 203350337 U CN203350337 U CN 203350337U
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CN
China
Prior art keywords
current sensor
module
wiring board
annular core
iron core
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.)
Expired - Fee Related
Application number
CN 201320439613
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Chinese (zh)
Inventor
王金鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAODING TIANTENG ELECTRIC Co Ltd
Original Assignee
BAODING TIANTENG ELECTRIC Co Ltd
Priority date (The priority date 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 date listed.)
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Application filed by BAODING TIANTENG ELECTRIC Co Ltd filed Critical BAODING TIANTENG ELECTRIC Co Ltd
Priority to CN 201320439613 priority Critical patent/CN203350337U/en
Application granted granted Critical
Publication of CN203350337U publication Critical patent/CN203350337U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a current sensor, comprising an annular iron core, a single turn the primary coil, a secondary coil, an iron core circuit board and a current sensor circuit board. The iron core circuit board employs depth negative feedback technology, automatic compensation for the annular iron core is provided, the annular iron core works in an ideal zero magnetic flux state, thereby the current sensor can detects a leakage current of a high voltage electric appliance in an on-line manner with high sensitivity, the measure scope is from hundreds of microamperes to hundreds of mA, the linearity in the measure scope is good, distortion of output waveforms are not easy to happen, and the requirement of insulation on-line monitor on a high voltage electric appliance is satisfied.

Description

Current sensor
Technical field
The application relates to the mutual inductor technical field, particularly relates to a kind of current sensor.
Background technology
In the high-voltage electrical equipment insulation line monitoring device of transformer station, current sensor plays key effect as monitoring equipment, its performance directly affects the reliability and stability of high-voltage electrical equipment cut-off loss measuring accuracy, for guaranteeing the sampling safety to the high-voltage electrical equipment signal, current sensor generally adopts the current transformer of punching structure.
The current sensor of existing single turn core structure, because primary coil only has a circle, therefore, the primary current signal that the primary coil of this kind of current sensor can be sensed is more weak, is difficult to measure the electric current of mA level.But the leakage current of high-tension apparatus is generally in the mA level, and, current sensor is operated in the place of strong electromagnetic, therefore, traditional passive electrical flow sensor can't guarantee the precision and stability of phase tranformation error, is difficult to meet the requirement of the insulated on-line monitoring of high-voltage electrical equipment.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of current sensor, and to solve the technical matters that adopts traditional current transformer mA level electric current can't be detected, technical scheme is as follows:
The application provides a kind of current sensor, comprising: shell, and be arranged on annular core, single primary turn, secondary coil, iron core wiring board and the current sensor wiring board that the interior surface spraying of described shell has insulating material;
Described primary coil is around side of described annular core, and described secondary coil is around another side of described annular core;
Described iron core wiring board connects described annular core, controls described annular core in desirable zero magnetic flux state;
Described current sensor wiring board is connected with the output terminal of described secondary coil, measures the current signal that described secondary coil induction obtains, and obtains the current signal on described single primary turn.
Wherein, described current sensor wiring board comprises: sensor assembly, signal protection module, signal acquisition module, signal processing module, overvoltage protective module and supply module;
The output terminal of described sensor assembly connects the input end of described signal protection module;
The output terminal of described signal protection module connects the input end of described signal acquisition module;
The first output terminal of described signal acquisition module connects the input end of described signal processing module;
The input end of described overvoltage protective module connects the second output terminal of described signal acquisition module;
Described supply module connects respectively the feeder ear of described sensor assembly, described signal protection module, described signal acquisition module and described signal processing module.
Wherein, the material of described annular core is the permalloy that the sheet magnetoconductivity is high, loss is little.
Wherein, described secondary coil adopts compound winding mode on described annular core.
Wherein, described shell is annotated the rapid shaping mode by aluminium and is obtained.
Wherein, be provided with the pickup groove be complementary with described primary coil and secondary coil in described shell upper medial surface.
Wherein, also comprise the shielding can, and in described shielding can is arranged on epoxy resin, wherein,
Be provided with described sensor line plate and described iron core wiring board in described shielding can.
The current sensor that the application provides, comprise annular core, single primary turn, secondary coil, iron core wiring board and current sensor wiring board, wherein said iron core wiring board adopts the deep negative feedback technique, can automatically compensate annular core, make annular core be operated in desirable zero magnetic flux state, thereby make current sensor can high sensitivity detect online the leakage current of high-voltage electrical equipment, measurement range in hundreds of uA level to hundreds of mA level, measurement range internal linear degree is good, output waveform does not produce distortion, can meet the requirement of the insulated on-line monitoring of high-voltage electrical equipment.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation that Fig. 1 is a kind of current sensor of the embodiment of the present application;
The structural representation that Fig. 2 is a kind of current sensor wiring board of the embodiment of the present application.
Embodiment
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all should belong to the scope of the application's protection.
Refer to Fig. 1 and Fig. 2, Fig. 1 shows the structural representation of a kind of current sensor of the embodiment of the present application, and Fig. 2 shows the structural representation of current sensor wiring board.
As shown in Figure 1, described current sensor comprises: the shell (not shown), and be arranged on annular core 1, primary coil 2, secondary coil 3, iron core wiring board 4 and current sensor wiring board 5 in described shell;
The surface spraying of annular core 1 has insulating material, and annular core employing sheet magnetoconductivity is high, and the little permalloy of loss is realized, concrete, annular core 1 is by the permalloy silt form around forming, then at its surperficial winding around, outermost layer adopts the permalloy outer cover to do shielding.
Described primary coil 2 is single-turn circular coil, and it is around a side of described annular core 1;
Described secondary coil 3 adopts compound winding mode another side around described annular core 1, and to the interference employing metallic shield method of electric field, external magnetic field adopts the iron core short-circuit method;
Described iron core wiring board 4 connects described annular core, adopts the deep negative feedback technique automatically to compensate annular core, to control described annular core in desirable zero magnetic flux state;
Described current sensor wiring board 5 is connected with the output terminal of described secondary coil 3, the current signal obtained for measuring secondary coil 3 inductions, and calculate the current signal on primary coil 2 according to the turn ratio between primary coil 2 and secondary coil 3.
Described shell is annotated the technology rapid shaping by aluminium, and is provided with the pickup groove be complementary with described primary coil and secondary coil on the medial surface of shell upper.
Preferably, described current sensor also comprises setting shielding can in the enclosure, be provided with described iron core wiring board and current sensor wiring board in the shielding can, and described shielding can is arranged in epoxy resin, can effectively shield strong electromagnetic, electric field and disturb, with the usable range of the current sensor that enlarges the application.
The current sensor that this enforcement provides is installed in the down conductor of high-voltage electrical equipment, the primary coil single turn is through the ground wire of high-voltage electrical equipment, can not change original mode of connection of high-voltage electrical equipment, and in described current sensor when work, do not contact any position of tested high-voltage electrical equipment.
Concrete, as shown in Figure 2, the current sensor wiring board comprises: sensor assembly 51, signal protection module 52, signal acquisition module 53, signal processing module 54, overvoltage protective module 55 and supply module 56;
Wherein, the output terminal of sensor assembly 51 connects the input end of described signal protection module 52, for the current signal of inductive secondary, and then calculates the current signal on primary coil according to the turn ratio between primary coil and secondary coil.
The output terminal of signal protection module 52 connects the input end of described signal acquisition module 53, for the signal that sensor assembly is obtained, is protected;
The first output terminal of described signal acquisition module connects the input end of described signal processing module 54; the second output terminal connects the input end of overvoltage protective module 55; for the signal to 52 outputs of signal protection module, gathered; and offer signal processing module 54 and processed, described signal is offered to overvoltage protective module 55 simultaneously and judge whether to carry out overvoltage protection.
Supply module 56 connects respectively the feeder ear of described sensor assembly, described signal protection module, described signal acquisition module and described signal processing module, for above-mentioned module provides operating voltage.
The current sensor that the application provides, comprise annular core, single primary turn, secondary coil, iron core wiring board and current sensor wiring board, wherein said iron core wiring board adopts the deep negative feedback technique, can automatically compensate annular core, make annular core be operated in desirable zero magnetic flux state, thereby make current sensor can high sensitivity detect online the leakage current of high-voltage electrical equipment, measurement range in hundreds of uA level to hundreds of mA level, measurement range internal linear degree is good, output waveform does not produce distortion, can meet the requirement of the insulated on-line monitoring of high-voltage electrical equipment.
It should be noted that, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operational zone, and not necessarily requires or imply between these entities or operation the relation of any this reality or sequentially of existing.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the equipment that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection domain.

Claims (7)

1. a current sensor, is characterized in that, comprising: shell, and be arranged on annular core, single primary turn, secondary coil, iron core wiring board and the current sensor wiring board that the interior surface spraying of described shell has insulating material;
Described primary coil is around side of described annular core, and described secondary coil is around another side of described annular core;
Described iron core wiring board connects described annular core, controls described annular core in desirable zero magnetic flux state;
Described current sensor wiring board is connected with the output terminal of described secondary coil, measures the current signal that described secondary coil induction obtains, and obtains the current signal on described single primary turn.
2. current sensor according to claim 1, is characterized in that, described current sensor wiring board comprises: sensor assembly, signal protection module, signal acquisition module, signal processing module, overvoltage protective module and supply module;
The output terminal of described sensor assembly connects the input end of described signal protection module;
The output terminal of described signal protection module connects the input end of described signal acquisition module;
The first output terminal of described signal acquisition module connects the input end of described signal processing module;
The input end of described overvoltage protective module connects the second output terminal of described signal acquisition module;
Described supply module connects respectively the feeder ear of described sensor assembly, described signal protection module, described signal acquisition module and described signal processing module.
3. current sensor according to claim 1, is characterized in that, the material of described annular core is the permalloy that the sheet magnetoconductivity is high, loss is little.
4. current sensor according to claim 1, is characterized in that, described secondary coil adopts compound winding mode on described annular core.
5. current sensor according to claim 1, is characterized in that, described shell is annotated the rapid shaping mode by aluminium and obtained.
6. current sensor according to claim 1, is characterized in that, is provided with the pickup groove be complementary with described primary coil and secondary coil in described shell upper medial surface.
7. current sensor according to claim 1, is characterized in that, also comprises the shielding can, and, in described shielding can is arranged on epoxy resin, wherein, be provided with described sensor line plate and described iron core wiring board in described shielding can.
CN 201320439613 2013-07-23 2013-07-23 Current sensor Expired - Fee Related CN203350337U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320439613 CN203350337U (en) 2013-07-23 2013-07-23 Current sensor

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Application Number Priority Date Filing Date Title
CN 201320439613 CN203350337U (en) 2013-07-23 2013-07-23 Current sensor

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CN203350337U true CN203350337U (en) 2013-12-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105277842A (en) * 2015-11-27 2016-01-27 国网山东省电力公司济南供电公司 Leakage electric current sensor for electrical device and leakage electric current signal extracting method
CN108663559A (en) * 2017-03-27 2018-10-16 株式会社田村制作所 Current detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105277842A (en) * 2015-11-27 2016-01-27 国网山东省电力公司济南供电公司 Leakage electric current sensor for electrical device and leakage electric current signal extracting method
CN105277842B (en) * 2015-11-27 2018-06-12 国网山东省电力公司济南供电公司 A kind of power equipment leakage current sensor and leakage current signal extracting method
CN108663559A (en) * 2017-03-27 2018-10-16 株式会社田村制作所 Current detector

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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: 20131218

Termination date: 20160723

CF01 Termination of patent right due to non-payment of annual fee