CN203745537U - High-accuracy transformer iron core grounding current test equipment - Google Patents
High-accuracy transformer iron core grounding current test equipment Download PDFInfo
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- CN203745537U CN203745537U CN201420089928.7U CN201420089928U CN203745537U CN 203745537 U CN203745537 U CN 203745537U CN 201420089928 U CN201420089928 U CN 201420089928U CN 203745537 U CN203745537 U CN 203745537U
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- iron core
- core grounding
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- grounding current
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Abstract
The utility model discloses high-accuracy transformer iron core grounding current test equipment, which comprises a clamp current clip and an iron core grounding current tester electrically connected with the clamp current clip. The iron core grounding current tester comprises an IV circuit conversion module for receiving output current of the clamp current clip, an amplifying circuit module for receiving output signals of the IV circuit conversion module, a shaping and frequency doubling circuit module for receiving output signals of the amplifying circuit module, an AD conversion module for receiving output signals of the amplifying circuit module, and a central processing module for receiving output signals of the AD conversion module and output signals of the shaping and frequency doubling circuit module. The central processing module outputs processed signals via display of a display. The high-accuracy transformer iron core grounding current test equipment can quickly and accurately test the transformer iron core grounding current and has the advantages of strong anti-interference ability, high test accuracy and the like.
Description
Technical field
The utility model relates to electric power system field, particularly a kind of high precision transformer iron core grounding current testing apparatus.
Background technology
Transformer is the most key equipment in electric power system, and its reliability service is directly connected to the safety of whole electrical network.The electric discharge that transformer core causes for fear of floating potential in the time of operation; should adopt one point earth; because being subject to the factors such as short-circuit impact, manufacturing issue or transformer can cause multipoint earthing of iron core in actual use; thereby ground current is sharply increased; cause the local heating of transformer, even burn ground lug, make transformer produce fault; gently cause protection action, heavy cause a serious accident.Therefore to transformer iron core grounding current regularly, avoid causing the effective means of security incident while detecting exactly.
When transformer iron core grounding current is normal, generally only have several milliamperes to tens milliamperes, once but the electric current that breaks down can sharply increase, can reach several amperes or tens amperes.So the testing tool of measuring transformer iron core grounding current need to possess broad measurement range, must meet the 5mA～10A test specification requiring in code.All generally to adopt clamp on amperemeter to measure at present, because common clamp on amperemeter all can only be applicable to measuring larger current signal, all poor for the measuring accuracy of little electric current.In addition, during due to measuring transformer iron core grounding current, transformer is in running status, and the electromagnetic interference (EMI) of its periphery is very strong, the particularly impact of power frequency magnetic field, and common clamp on amperemeter is difficult to eliminate the impact of magnetic interference.So conventionally can cause the discreteness of the measurement result measuring at diverse location, different time very large.
Utility model content
A little less than technical problem to be solved in the utility model is the antijamming capability for the existing testing tool for measuring transformer iron core grounding current, deficiency and the defect such as measuring accuracy is low, provide the transformer iron core grounding current that a kind of antijamming capability is strong, measuring accuracy is high testing apparatus, to address the above problem.
The technical matters that the utility model solves can realize by the following technical solutions:
High precision transformer iron core grounding current testing apparatus, comprises pincerlike electric current folder, also comprises that one presss from both sides with described pincerlike electric current the iron core grounding current tester being electrically connected, and described iron core grounding current tester comprises:
Be used for the IV circuit conversion module of the output current that receives described pincerlike electric current folder,
Be used for the amplifying circuit module of the output signal that receives described IV circuit conversion module,
Be used for shaping and the frequency multiplier circuit module of the output signal that receives described amplifying circuit module,
Be used for the AD modular converter of the output signal that receives described amplifying circuit module, and
Be used for the central processing module of the output signal that receives the output signal of described AD modular converter, described shaping and frequency multiplier circuit module;
Described central processing module shows output by treated signal by a display.
In a preferred embodiment of the present utility model, described central processing module also with operation push-button control linkage.
In a preferred embodiment of the present utility model, the clamp of described pincerlike electric current folder comprises alloy-iron core, current coil layer, electric shield layer, magnetic masking layer from the inside to the outside successively.
Owing to having adopted technical scheme as above, the utility model can test out transformer iron core grounding current rapidly and accurately, and has that antijamming capability is strong, measuring accuracy advantages of higher.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the utility model high precision transformer iron core grounding current testing apparatus.
Fig. 2 is the principle flow chart of iron core grounding current tester of the present utility model.
Fig. 3 is the cross-sectional view of the pincerlike electric current folder of a kind of embodiment of the present utility model.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Shown in Fig. 1 and Fig. 2, high precision transformer iron core grounding current testing apparatus comprises pincerlike electric current folder 100 and iron core grounding current tester 200, and the current output terminal 102 of pincerlike electric current folder 100 is connected by wire 320 with the detection current input terminal 210 of iron core grounding current tester 200.In order to improve the anti-jamming effectiveness of pincerlike electric current folder 100, shown in Fig. 3, the clamp of the pincerlike electric current folder 100 in the present embodiment comprises alloy-iron core 110, current coil layer 120, electric shield layer 130, magnetic masking layer 140 from the inside to the outside successively.
On the guidance panel 200a of iron core grounding current tester 200, be provided with lattice lcd display 220 and some operation push-buttons 230.The inside of iron core grounding current tester 200 has IV circuit conversion module 201, amplifying circuit module 202, shaping and frequency multiplier circuit module 203, AD modular converter 204 and central processing module 205.Wherein, IV circuit conversion module 201 is for receiving the detection electric current of being exported by the current output terminal 102 of pincerlike electric current folder 100; Amplifying circuit module 202 is for receiving the output signal of processing through IV circuit conversion module 201; Shaping and frequency multiplier circuit module 203 are for receiving the output signal of processing through amplifying circuit module 202; AD modular converter 204 is for receiving the output signal of processing through amplifying circuit module 202; Central processing module 205 is for receiving the output signal of processing through AD modular converter 204 and the output signal of passing through shaping and frequency multiplier circuit module 203; Central processing module 205 shows output by treated signal by lattice lcd display 220.
Utilize the utility model can adopt two kinds of method of testings to test transformer iron core grounding current, principle of work of the present utility model is as follows:
Utilize conventional method to test transformer iron core grounding current:
Pincerlike electric current folder 100 is clipped in to the periphery of tested transformer core grounding wire 210, make the clamp center 101 of tested transformer core grounding wire 210 through pincerlike electric current folder 100, now the testing circuit of pincerlike electric current folder 100 will be admitted to iron core grounding current tester 200, carry out analyzing and processing by IV circuit conversion module 201, amplifying circuit module 202, shaping and frequency multiplier circuit module 203, AD modular converter 204 and central processing module 205, finally show output by lattice lcd display 220.
Utilize vector superposed anti-interference method to test transformer iron core grounding current:
To the jaw of pincerlike electric current folder 100 is tested near tested transformer core grounding wire 210 sides, record current test data by iron core grounding current tester 200, and then the pincerlike electric current folder 100 of translation, make pincerlike electric current folder 100 be clipped in the periphery of tested transformer core grounding wire 210, make the clamp center 101 of tested transformer core grounding wire 210 through pincerlike electric current folder 100, now the testing circuit of pincerlike electric current folder 100 will be admitted to iron core grounding current tester 200, by IV circuit conversion module 201, amplifying circuit module 202, shaping and frequency multiplier circuit module 203, AD modular converter 204 and central processing module 205 carry out analyzing and processing, and central processing module 205 is undertaken vector superposed by the data of the data of this test and test last time, obtain final test data and show output by lattice lcd display 220.This method of testing can be offset pincerlike electric current folder 100 undesired signals that cannot shield, and is applicable to the environment that transformer side has high-intensity magnetic field to disturb.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. high precision transformer iron core grounding current testing apparatus, comprises pincerlike electric current folder, it is characterized in that, also comprise that one presss from both sides with described pincerlike electric current the iron core grounding current tester being electrically connected, described iron core grounding current tester comprises:
Be used for the IV circuit conversion module of the output current that receives described pincerlike electric current folder,
Be used for the amplifying circuit module of the output signal that receives described IV circuit conversion module,
Be used for shaping and the frequency multiplier circuit module of the output signal that receives described amplifying circuit module,
Be used for the AD modular converter of the output signal that receives described amplifying circuit module, and
Be used for the central processing module of the output signal that receives the output signal of described AD modular converter, described shaping and frequency multiplier circuit module;
Described central processing module shows output by treated signal by a display.
2. high precision transformer iron core grounding current testing apparatus as claimed in claim 1, is characterized in that, described central processing module also with operation push-button control linkage.
3. high precision transformer iron core grounding current testing apparatus as claimed in claim 1, is characterized in that, the clamp of described pincerlike electric current folder comprises alloy-iron core, current coil layer, electric shield layer, magnetic masking layer from the inside to the outside successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420089928.7U CN203745537U (en) | 2014-02-28 | 2014-02-28 | High-accuracy transformer iron core grounding current test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420089928.7U CN203745537U (en) | 2014-02-28 | 2014-02-28 | High-accuracy transformer iron core grounding current test equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745537U true CN203745537U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420089928.7U Expired - Fee Related CN203745537U (en) | 2014-02-28 | 2014-02-28 | High-accuracy transformer iron core grounding current test equipment |
Country Status (1)
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| CN (1) | CN203745537U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764929A (en) * | 2015-03-10 | 2015-07-08 | 三峡大学 | Grounding current testing device for portable transformer iron core |
| CN104849540A (en) * | 2015-05-07 | 2015-08-19 | 国家电网公司 | Power transmission and transformation startup debugging micro current measuring pliers |
| CN105203834A (en) * | 2015-08-24 | 2015-12-30 | 国网山东省电力公司聊城供电公司 | Transformer iron core and clamp member current standard exceeding alarm instrument |
| CN106199164A (en) * | 2016-06-28 | 2016-12-07 | 国网河南桐柏县供电公司 | A kind of measuring method of transformer iron core grounding current |
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
-
2014
- 2014-02-28 CN CN201420089928.7U patent/CN203745537U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764929A (en) * | 2015-03-10 | 2015-07-08 | 三峡大学 | Grounding current testing device for portable transformer iron core |
| CN104849540A (en) * | 2015-05-07 | 2015-08-19 | 国家电网公司 | Power transmission and transformation startup debugging micro current measuring pliers |
| CN105203834A (en) * | 2015-08-24 | 2015-12-30 | 国网山东省电力公司聊城供电公司 | Transformer iron core and clamp member current standard exceeding alarm instrument |
| CN106199164A (en) * | 2016-06-28 | 2016-12-07 | 国网河南桐柏县供电公司 | A kind of measuring method of transformer iron core grounding current |
| CN106199164B (en) * | 2016-06-28 | 2019-07-12 | 国网河南桐柏县供电公司 | A kind of measurement method of transformer iron core grounding current |
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
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| Date | Code | Title | Description |
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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: 20140730 Termination date: 20150228 |
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| EXPY | Termination of patent right or utility model |