CN203216967U - Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system - Google Patents

Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system Download PDF

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Publication number
CN203216967U
CN203216967U CN 201320012078 CN201320012078U CN203216967U CN 203216967 U CN203216967 U CN 203216967U CN 201320012078 CN201320012078 CN 201320012078 CN 201320012078 U CN201320012078 U CN 201320012078U CN 203216967 U CN203216967 U CN 203216967U
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China
Prior art keywords
current
transformer
current transformer
iron core
interference
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Application number
CN 201320012078
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Chinese (zh)
Inventor
郭绍伟
谢小英
马继先
钱欣
刘少宇
许竞
龙凯华
刘继东
郝震
王淑珍
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State Grid Jibei Electric Power Co Ltd
Original Assignee
Jibei Electric Power Co Ltd Qinhuangdao Electric Power Co
State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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Abstract

The utility model provides a pliers-shaped anti-interference current transformer and a transformer iron core grounding current testing system. The pliers-shaped anti-interference current transformer comprises a measuring current transformer body and a compensation current transformer body, wherein the measuring current transformer body is arranged on a transformer iron core grounding line in a sleeved mode and used for measuring the grounding current of a transformer iron core, the positive electrode of the measuring current transformer body is connected with the positive electrode of an ampere meter, and the negative electrode of the measuring current transformer body is connected with the negative electrode of the ampere meter. The compensation current transformer body is used for compensating the interference current of a leakage magnetic field, wherein the positive electrode of the compensation current transformer body is connected with the negative electrode of the measuring current transformer body, and the negative electrode of the compensation current transformer body is connected with the positive electrode of the measuring current transformer body. By means of the pliers-shaped anti-interference current transformer, interference generated by the leakage magnetic field can be balanced, and the accurate measurement of the grounding current of the transformer iron core can be realized.

Description

Pincerlike anti-interference current mutual inductor and transformer iron core grounding current test macro
Technical field
The utility model is about the transformer iron core grounding current measuring technology, particularly about a kind of pincerlike anti-interference current mutual inductor (Current Transformer CT) and transformer iron core grounding current test macro.
Background technology
Power industry is the industry in advance of national industry, and the stable development of power industry is the basis of national economy sustainable development.Transformer is as the important component part of electric system, and its running status directly influences the security of system.Along with UHV (ultra-high voltage) and extra-high voltage technology rapid development, net capacity strengthens and coverage rate augmentation, and its fault may cause great harm and influence to electric system and user.
Transformer core is the critical piece of transformer internal delivery, conversion electromagnetic energy, the necessary ground connection of the transformer core of normal operation, and can only one point earth, but transformer core causes local overheating unshakable in one's determination because of multipoint earthing even the accident of burning happens occasionally at the scene.
Whether its operation can effectively be found and react to iron core grounding current normal, in order to improve the power network safety operation level, promote the ability of crime prevention system accident, need a kind of measuring method accurately and effectively and system badly transformer iron core grounding current is measured.
At present, use common reometer to measure in the domestic main dependence tour process, measurement to transformer iron core grounding current is still more coarse, too simple, owing to there is certain stray field around the operating transformer, measurement to iron core grounding current has certain influence, if do not consider the influence of stray field, only being suitable for the common current split-core type meter measures, measurement result has randomness, can't accurately reflect and find to satisfy the requirement of lean and standardized management by the transformer early defect.And the accurate measurement of transformer iron core grounding current does not also have correlative study, lacks basis for estimation, can not guarantee the accuracy of measuring.
The utility model content
The utility model provides a kind of pincerlike anti-interference current mutual inductor, and the interference so that the balance stray field produces realizes the accurate measurement to transformer iron core grounding current.
To achieve these goals, the utility model provides a kind of pincerlike anti-interference current mutual inductor, this pincer anti-interference current mutual inductor comprises: measure current transformer, be enclosed within on the transformer core ground wire, be used for the measuring transformer iron core grounding current, the positive pole of described measurement current transformer connects the positive pole of a reometer, and the negative pole of described measurement current transformer connects the negative pole of described reometer; Compensation current transformer is used for compensation stray field interference current, and the positive pole of described compensation current transformer connects the negative pole of described measurement current transformer, and the negative pole of described compensation current transformer connects the positive pole of described measurement current transformer.
Further, described reometer inside comprises: clamp interface circuit, A/D change-over circuit, digital signal processing circuit and human-machine interface module; The current signal of described measurement current transformer output is converted to voltage signal and carries out filtering through behind the described interface circuit, filtered voltage signal is converted to digital signal through described A/D change-over circuit, and described digital signal carries out entering described human-machine interface module behind the calculus of differences through described digital signal processing circuit.
Further, human-machine interface module comprises: display and keyboard.
Further, comprise in the described reometer: a rechargeable battery.
To achieve these goals, the utility model provides a kind of transformer iron core grounding current test macro, described transformer iron core grounding current test macro comprises: transformer, pincerlike anti-interference current mutual inductor and reometer, described pincerlike anti-interference current mutual inductor comprises: measure current transformer, be enclosed within on the transformer core ground wire, be used for the measuring transformer iron core grounding current, the positive pole of described measurement current transformer connects the positive pole of a reometer, and the negative pole of described measurement current transformer connects the negative pole of described reometer; Compensation current transformer is used for compensation stray field interference current, and the positive pole of described compensation current transformer connects the negative pole of described measurement current transformer, and the negative pole of described compensation current transformer connects the positive pole of described measurement current transformer.
Further, described reometer inside comprises: clamp interface circuit, A/D change-over circuit, digital signal processing circuit and human-machine interface module; The current signal of described measurement current transformer output is converted to voltage signal and carries out filtering through behind the described interface circuit, filtered voltage signal is converted to digital signal through described A/D change-over circuit, and described digital signal carries out entering described human-machine interface module behind the calculus of differences through described digital signal processing circuit.
Further, human-machine interface module comprises: display and keyboard.
Further, comprise in the described reometer: a rechargeable battery.
The beneficial effect of the utility model embodiment is, in the transformer iron core grounding current test macro of the present utility model, when utilizing pincerlike anti-interference current mutual inductor 301 to measure iron core grounding current, can revise because stray field is disturbed the interference current that produces, carry out current compensation, make measurement result more accurate.The configuration design of pincerlike anti-interference current mutual inductor makes and is enclosed within when it is convenient to measure electric current on the transformer core ground wire.Reometer is provided with rechargeable battery, can be there not being under the situation of power supply this reometer of use, and easy to carry.
Description of drawings
Be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of measuring transformer iron core grounding current;
Fig. 2 is that each current phasor when measuring iron core grounding current in the prior art concerns synoptic diagram;
Fig. 3 is the structural representation of the utility model embodiment transformer iron core grounding current test macro;
Fig. 4 is the pictorial diagram of the pincerlike anti-interference current mutual inductor 301 of the utility model embodiment;
Fig. 5 is the open mode synoptic diagram of the pincerlike anti-interference current mutual inductor 301 of the utility model embodiment;
Fig. 6 is the utility model embodiment digital electronic ammeter panel construction synoptic diagram;
Fig. 7 is the structural representation of clamp interface circuit;
Fig. 8 is the structural representation of A/D change-over circuit;
Fig. 9 is the structural representation of digital signal processing circuit;
Figure 10 is the structural representation of human-machine interface module.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
In the prior art, the schematic diagram of measuring transformer iron core grounding current as shown in Figure 1, the two ends of measuring current transformer (CT) 101 directly connect a reometer 102, iron core grounding current generally comprises the interference current ib that brings owing to stray field in true iron core downlead current i a and the measurement, as shown in Figure 2.Stray field around the transformer has very big randomness according to structure and operating condition different, just makes that also interference current ib has randomness.Simultaneously, because the anisotropy of stray field, the direction of interference current ib has randomness equally in the measuring process, even same measurement CT also can't get rid of the influence of stray field from numerical value.
Final actual measurement current value ic=ia+ib, ia is true iron core downlead electric current, ib is the interference current that stray field is brought.
The volume measuring error of bringing for balance interference current in metering circuit, as shown in Figure 3, the utility model embodiment provides a kind of transformer iron core grounding current test macro, this transformer iron core grounding current test macro comprises: transformer 305, pincerlike anti-interference current mutual inductor 301 and reometer 306.Pincerlike anti-interference current mutual inductor 301 comprises: measure current transformer 302 and compensation current transformer 303.
Measure current transformer 302 and be enclosed within on the transformer core ground wire 304, be used for the iron core grounding current of measuring transformer 305.The positive pole of measuring current transformer 302 connects the positive pole of a reometer, and the negative pole of measuring current transformer 303 connects the negative pole of reometer 306.
Compensation current transformer 303 is used for the compensation stray field and disturbs the electric current that produces, and the positive pole of compensation current transformer 303 connects the negative pole of measuring current transformer 302, and the negative pole of compensation current transformer 303 connects the positive pole of measuring current transformer 302.
In the transformer iron core grounding current test macro of the present utility model, when utilizing pincerlike anti-interference current mutual inductor 301 to measure iron core grounding current, can revise because stray field is disturbed the interference current that produces, carry out current compensation, make measurement result more accurate.
Fig. 4 is the pictorial diagram of the pincerlike anti-interference current mutual inductor 301 of the utility model embodiment, and pincerlike anti-interference current mutual inductor 301 is connected to reometer 306 by signal wire 401 as shown in Figure 4.Pincerlike anti-interference current mutual inductor 301 comprises pincerlike parts 402 and handheld component 403, and handheld component 403 is provided with a press section 404.When holding press section 404, the press section 404 that press...withes one's finger down, the movable end 405 of pincerlike parts 402 will form opening, is enclosed within on the transformer core ground wire 406 of transformer 305, as shown in Figure 5.When making the movable end 405 of pincerlike parts 402 open after pressing by press section 404, only need simple physical construction to realize, repeat no more.
Need to prove, measuring current transformer 302 is arranged in the pincerlike parts 402, and compensation current transformer 303 is arranged in the handheld component 403, when pincerlike parts 402 entangle transformer core ground wire 406, measure current transformer 302 and will entangle transformer core ground wire 406, iron core grounding current that can measuring transformer iron core grounding line 406.
Reometer 306 has been shown among Fig. 4, and this reometer is digital electronic ammeter, and the digital electronic ammeter panel construction as shown in Figure 6.
Reometer 306 inside comprise: clamp interface circuit, A/D change-over circuit, digital signal processing circuit and human-machine interface module.Fig. 7 is the structural representation of clamp interface circuit; Fig. 8 is the structural representation of A/D change-over circuit; Fig. 9 is the structural representation of digital signal processing circuit; Figure 10 is the structural representation of human-machine interface module.The current signal of described measurement current transformer output is converted to voltage signal and carries out filtering through behind the described interface circuit, filtered voltage signal is converted to digital signal through described A/D change-over circuit, and described digital signal is carried out entering human-machine interface module behind the calculus of differences through described digital signal processing circuit and shown.Human-machine interface module comprises Keysheet module and display module, and Keysheet module and display module be keyboard and the display screen shown in the digital current surface plate of Fig. 6 specifically.
Preferably, comprise a rechargeable battery in the reometer 306, when reometer 306 inserts the 220V power supplys, just can charge to rechargeable battery, thus this reometer 306 can use under the situation of power supply not having, easy to carry.
Used specific embodiment in the utility model principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims (8)

1. a pincerlike anti-interference current mutual inductor is characterized in that, described pincerlike anti-interference current mutual inductor comprises:
Measure current transformer, be enclosed within on the transformer core ground wire, be used for the measuring transformer iron core grounding current, the positive pole of described measurement current transformer connects the positive pole of a reometer, and the negative pole of described measurement current transformer connects the negative pole of described reometer;
Compensation current transformer is used for compensation stray field interference current, and the positive pole of described compensation current transformer connects the negative pole of described measurement current transformer, and the negative pole of described compensation current transformer connects the positive pole of described measurement current transformer.
2. pincerlike anti-interference current mutual inductor according to claim 1 is characterized in that, described reometer inside comprises: clamp interface circuit, A/D change-over circuit, digital signal processing circuit and human-machine interface module;
The current signal of described measurement current transformer output is converted to voltage signal and carries out filtering through behind the described interface circuit, filtered voltage signal is converted to digital signal through described A/D change-over circuit, and described digital signal carries out entering described human-machine interface module behind the calculus of differences through described digital signal processing circuit.
3. pincerlike anti-interference current mutual inductor according to claim 2 is characterized in that human-machine interface module comprises: display and keyboard.
4. pincerlike anti-interference current mutual inductor according to claim 3 is characterized in that, comprises in the described reometer: a rechargeable battery.
5. a transformer iron core grounding current test macro is characterized in that, described transformer iron core grounding current test macro comprises: transformer, and pincerlike anti-interference current mutual inductor and reometer, described pincerlike anti-interference current mutual inductor comprises:
Measure current transformer, be enclosed within on the transformer core ground wire, be used for the measuring transformer iron core grounding current, the positive pole of described measurement current transformer connects the positive pole of a reometer, and the negative pole of described measurement current transformer connects the negative pole of described reometer;
Compensation current transformer is used for compensation stray field interference current, and the positive pole of described compensation current transformer connects the negative pole of described measurement current transformer, and the negative pole of described compensation current transformer connects the positive pole of described measurement current transformer.
6. transformer iron core grounding current test macro according to claim 5 is characterized in that, described reometer inside comprises: clamp interface circuit, A/D change-over circuit, digital signal processing circuit and human-machine interface module;
The current signal of described measurement current transformer output is converted to voltage signal and carries out filtering through behind the described interface circuit, filtered voltage signal is converted to digital signal through described A/D change-over circuit, and described digital signal carries out entering described human-machine interface module behind the calculus of differences through described digital signal processing circuit.
7. transformer iron core grounding current test macro according to claim 6 is characterized in that human-machine interface module comprises: display and keyboard.
8. transformer iron core grounding current test macro according to claim 7 is characterized in that, comprises in the described reometer: a rechargeable battery.
CN 201320012078 2013-01-10 2013-01-10 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system Active CN203216967U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320012078 CN203216967U (en) 2013-01-10 2013-01-10 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320012078 CN203216967U (en) 2013-01-10 2013-01-10 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system

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Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103063895A (en) * 2013-01-10 2013-04-24 华北电力科学研究院有限责任公司 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system
CN110568255A (en) * 2019-09-27 2019-12-13 上海锐开电气有限公司 Sensor for on-site display of clamp-type iron core grounding current during transformer main transformer operation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103063895A (en) * 2013-01-10 2013-04-24 华北电力科学研究院有限责任公司 Pliers-shaped anti-interference current transformer and transformer iron core grounding current testing system
CN110568255A (en) * 2019-09-27 2019-12-13 上海锐开电气有限公司 Sensor for on-site display of clamp-type iron core grounding current during transformer main transformer operation

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C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee
CP01 Change in the name or title of a patent holder

Address after: 100045 Beijing city Xicheng District Fuxingmenwai Nan Xiang Di Zang an 1

Patentee after: North China Electrical Power Research Institute LLC

Patentee after: Qinhuangdao Power Supply Company of State Grid Jibei Electric Power Company Limited

Patentee after: State Grid Corporation of China

Address before: 100045 Beijing city Xicheng District Fuxingmenwai Nan Xiang Di Zang an 1

Patentee before: North China Electrical Power Research Institute LLC

Patentee before: Jibei Electric Power Company Limited, Qinhuangdao Electric Power Company

Patentee before: State Grid Corporation of China

CP03 Change of name, title or address

Address after: 066000 Haiyang Road, Qinhuangdao Harbour District, Hebei, No. 50

Patentee after: Qinhuangdao Power Supply Company of State Grid Jibei Electric Power Company Limited

Patentee after: North China Electrical Power Research Institute LLC

Patentee after: State Grid Corporation of China

Address before: 100045 Beijing city Xicheng District Fuxingmenwai Nan Xiang Di Zang an 1

Patentee before: North China Electrical Power Research Institute LLC

Patentee before: Qinhuangdao Power Supply Company of State Grid Jibei Electric Power Company Limited

Patentee before: State Grid Corporation of China