CN204855773U - Self -correcting coil of CT measurement winding for electric power system - Google Patents

Self -correcting coil of CT measurement winding for electric power system Download PDF

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Publication number
CN204855773U
CN204855773U CN201520554853.XU CN201520554853U CN204855773U CN 204855773 U CN204855773 U CN 204855773U CN 201520554853 U CN201520554853 U CN 201520554853U CN 204855773 U CN204855773 U CN 204855773U
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China
Prior art keywords
winding
self
insulation button
current transformer
groove
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CN201520554853.XU
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Chinese (zh)
Inventor
王欢
项琼
王强
岳长喜
刘浩
朱凯
王雪
彭淑华
陈泽远
杨洪
赵威
徐晨
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
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Abstract

The utility model provides a self -correcting coil of CT measurement winding for electric power system, including draw -in groove switch, primary winding and secondary winding, secondary winding includes the same first winding of ampere turn and secondary winding, the both ends of first winding and secondary winding all are provided with connecting terminal, connecting terminal's middle part all is equipped with a fretwork recess, when the normal during operation of current transformer, first winding and secondary winding pass through draw -in groove switch parallel connection, carry out the self -correcting as current transformer and examine time measuring, first winding and secondary winding disconnect. Compared with the prior art, the utility model provides a pair of self -correcting coil of CT measurement winding for electric power system carries out the error when measuring to the current transformer coil, need not use large -scale liter to flow ware, the long lead that bears the kiloampere and precision standard ware, greatly reduced at the error surveying work of job site to current transformer, simplified the measurement mode of connection, improved work efficiency.

Description

A kind of self-correcting coil of electric system CT measure winding
Technical field
The utility model relates to power grid operation management field, is specifically related to a kind of self-correcting coil of electric system CT measure winding.
Background technology
The measure winding of electric system Current Transformer (CurrentTransformer, CT) needs to carry out periodicity by the regulation of measurement Law and detects.CT error characteristics periodically detection are the important evidence of accurate evaluation economy operation of power grid.Along with the lifting of electric pressure, GIS pipe diameter and loop length all can increase, and the difficulty of the CT coil being arranged on its surface being carried out to error characteristics test also can increase.Current electric grid engineering is the error testing that carries out before CT coil is installed mainly, and most cases all adopts and waits ampere-turn method, on CT coil, is namely wound around Primary Conductor, or is being provided with a winding wire on the long tank body of CT coil number rice.But this test method is not to the error characteristics commissioning test that CT carries out truly.If will relative method be used to carry out the test of CT error characteristics after CT installs, then need by two outlet casing tubes of GIS, outside it, access the equipment such as standard CT and high-power current lifting device, form a closed cranking test loop.The difficulty that this method is implemented in extra-high voltage project is very large, even if by means of grounding switch, because the through-current capacity of grounding switch only has hundreds of ampere, so can not carry out error measure under stable state big current.Carry out error measure in this way if adopted, just require that the equipment such as isolating switch, disconnector is formed according to big current loop and carry out design operation, this has higher requirement to device fabrication unit.Meanwhile, because test loop is long especially, the capacity requirement of big current current lifting device is often greater than, and causes test unit to there is larger burden in equipment investment and human input.Along with the Fast Construction of extra-high voltage project, number of devices gets more and more, and should consider state-detection and the state estimation of CT, reduces maintenance work amount.
Power current ratio tracing technology is applied in electric system engineering, realizes the on-the-spot self-correcting of engineering CT error characteristics, greatly improve maintenance work efficiency, meet CT periodic error Characteristics Detection demand.CT error characteristics magnitude tracing the most original and the most widely method be exactly CT self-correcting, power current sensor is exactly adopt the mode of 1A:1A to carry out magnitude tracing the earliest.If the material of CT iron core, size, ampere turns is selected suitably, even if do not adopt the means such as compensation, the level of accuracy of CT can reach very high level.Such as, (primary current scope 0-60kA, class of accuracy is 2 × 10 to the current transformer benchmark preserved in national high-voltage metering station -7-1 × 10 -6) be exactly the error calibration adopting self-correcting mode to carry out.At present, the laboratory bearing current ratio magnitude tracing and transmission in developed countries such as Europe, the U.S., Canada all adopts self-correcting means to carry out the demarcation of the most pin-point accuracy grade of current transformer.Wherein, the current transformer error class of accuracy of National Institute of Standards and Technology NIST is 1 × 10 -5; The error class of accuracy of German federal physical technique research institute PTB is 2 × 10 -6-1 × 10 -5; The error class of accuracy of National Research Council of Canada NRC is 2 × 10 -6-1 × 10 -5.
For measurement CT works, CT self correction method is a kind of proven technique, but never adopt on engineering CT, main difficulty is engineering CT except error characteristics require, also has the operating condition that a series of measurement CT such as insulating property, tolerance system short-circuit electric current, long-term work heating does not relate to.In addition, engineer applied CT must method of operating simple, safe and reliable.Therefore need to provide a kind of self-correcting type CT coil design approaches being applicable to extra-high voltage project application.
Summary of the invention
In order to meet the needs of prior art, the utility model provides a kind of self-correcting coil of electric system CT measure winding.
The technical solution of the utility model is:
Described self-correcting coil comprises a winding and Secondary Winding, and described Secondary Winding comprises the first identical winding of ampere turns and the second winding;
The two ends of described first winding are provided with splicing ear, and the two ends of the second winding are also provided with splicing ear; The middle part of described splicing ear is equipped with a hollow out groove;
Described self-correcting coil also comprises a draw-in groove switch:
When current transformer normally works, described first winding is connected by draw-in groove switch in parallel with the second winding;
When current transformer carries out self-correcting detection, described first winding and the second winding disconnect.
Preferably, described draw-in groove switch comprises insulation button a1, insulation button a2, insulation button b1 and insulation button b2; Described insulation button a1 is connected with insulation button b2 by wire, and insulation button a2 is also connected with insulation button b1 by wire;
Each insulation button is provided with a salient point;
Preferably, when the first winding is connected by draw-in groove switch in parallel with the second winding:
The salient point of insulation button a1 embeds in the hollow out groove of the first winding side splicing ear, and the salient point of insulation button b2 embeds in the hollow out groove of the first winding opposite side splicing ear;
The salient point of insulation button b1 embeds in the hollow out groove of the second winding side splicing ear, and the salient point of insulation button a2 embeds in the hollow out groove of the second winding opposite side splicing ear;
Preferably, described first winding and the second winding adopt interval and around mode be wound on the iron core of current transformer;
Preferably, the iron core outer setting of described current transformer has protection box.
Compared with immediate prior art, excellent effect of the present utility model is:
1, a kind of self-correcting coil of electric system CT measure winding that provides of the utility model, when error measure is carried out to current mutual inductor coil, do not need to use large-scale current lifting device, bear the long lead of kiloampere and precision standard device, greatly reduce the error measure work to current transformer in working site, simplify the measurement mode of connection, improve work efficiency;
2, a kind of self-correcting coil of electric system CT measure winding that provides of the utility model, the first winding and the second winding adopt interval and around mode coiling, reduce the leakage reactance between two Secondary Winding;
3, a kind of self-correcting coil of electric system CT measure winding that provides of the utility model, not only can be applied to the on-the-spot commissioning test of current transformer, can also be applied to the units test of current transformer;
4, a kind of self-correcting coil of electric system CT measure winding that provides of the utility model, the first winding and the second winding adopt draw-in groove switch to be connected, and facilitate connection and the replacing of winding.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1: a kind of design concept figure of self-correcting coil of electric system CT measure winding in the utility model embodiment;
Fig. 2: the electric system front elevation of the self-correcting coil of CT measure winding in the utility model embodiment;
Fig. 3: the electric system vertical view of the self-correcting coil of CT measure winding in the utility model embodiment;
Fig. 4: the structural representation of splicing ear in the utility model embodiment;
Fig. 5: the structural representation of draw-in groove switch in the utility model embodiment;
Wherein, 1: splicing ear; 2: the protection box of iron core; 3: Secondary Winding; 4: iron core.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
The specific embodiment of the self-correcting coil of the electric system CT measure winding that the utility model provides as shown in Figure 1,
This self-correcting coil comprises draw-in groove switch, a winding N 1and Secondary Winding.
1, Secondary Winding
As shown in Figure 1, this Secondary Winding comprises the first winding N 2with the second winding N 3.Wherein,
First winding N 2two ends be provided with splicing ear S1 and splicing ear S2, as shown in Figure 4, the middle part of splicing ear is equipped with a hollow out groove;
Second winding N 3two ends be also provided with splicing ear S3 and splicing ear S4, as shown in Figure 4, the middle part of splicing ear is equipped with a hollow out groove.
In the present embodiment the first winding and the second winding adopt interval and around mode be wound on the iron core of current transformer, to reduce the volume leakage reactance between two Secondary Winding.The iron core outer setting of current transformer has protection box.
2, draw-in groove switch:
As shown in Figure 5, this draw-in groove switch comprises insulation button a1, insulation button a2, insulation button b1 and insulation button b2.Wherein,
Insulation button a1 is connected with insulation button b2 by wire, and insulation button a2 is also connected with insulation button b1 by wire, and insulation button a1 and insulation button b1 is as draw-in groove switch breaker in middle K 1two ends, insulation button a2 and insulation button b2 is as draw-in groove switch breaker in middle K 2two ends.And each insulation button is provided with a salient point.
(1) when current transformer normally works, the first winding is connected by draw-in groove switch in parallel with the second winding, is specially:
The salient point of insulation button a1 embeds in the hollow out groove of the first winding side splicing ear, and the salient point of insulation button b2 embeds in the hollow out groove of the first winding opposite side splicing ear; The salient point of insulation button b1 embeds in the hollow out groove of the second winding side splicing ear, and the salient point of insulation button a2 embeds in the hollow out groove of the second winding opposite side splicing ear.
Namely as shown in Figures 4 and 5, K switch 1two ends embed splicing ear S1 and S3 respectively, K switch 2two ends embed splicing ear S2 and S4 respectively.
(2) when current transformer carries out self-correcting detection, the first winding and the second winding disconnect, and specific works process is:
First winding N in the present embodiment 2with the second winding N 3ampere turns identical.
1.: the error information e of the first winding when measurement current transform er normally works 11with the error information e of the second winding 21, adopt the above-mentioned error information of comparative method for measuring in the present embodiment, also can be obtained by the delivery test of current transformer and commissioning test.
2.: by the first winding N 2as new winding, the second winding N 3as Secondary Winding composition self calibration module, by the K switch shown in Fig. 1 1and K 2disconnect, detect the second winding N 3concrete steps comprise:
A, to the first winding N 2pass into electric current C 1;
B, detect the second winding N 3in due to undesirable mutual electromagnetic inductance produce electric current C 2;
C, calculating current C 1with electric current C 2error information e 22;
D, relative error data e 21with error information e 22, judge the second winding N 3whether break down.
3.: by the second winding N 3as new winding, the first winding N 2as Secondary Winding composition self calibration module, by the K switch shown in Fig. 1 1and K 2disconnect, detect the first winding N 2concrete steps comprise:
A, to the second winding N 3pass into electric current C 1;
B, detect the first winding N 2in due to undesirable mutual electromagnetic inductance produce electric current C 2;
C, calculating current C 1with electric current C 2error information e 12;
D, relative error data e 11with error information e 12, judge the first winding N 2whether break down.
Extra-high voltage current mutual inductor coil size is comparatively large, is easily subject to the interference of external magnetic field, finally causes magnetic circuit magnetic flux non-uniform phenomenon comparatively obvious.In addition the transient current owing to producing when system caters to process and system short-circuit state can reach 50kA to 63kA, the transient transcendence formed can produce electrodynamic action to the soft magnetic material of current mutual inductor coil, soft magnetic material is caused to produce striction phenomenon in transient state process, local magnetic permeability changes, and also can produce strong thermal stress etc.Therefore there is protection box as screen layer to alleviate the inconsistent phenomenon of current mutual inductor coil each several part magnetic flux in the iron core outer setting of current transformer in the present embodiment, or adopt the means of balance winding to alleviate the inconsistent phenomenon of current flux amount.
In the utility model, the specific embodiment of the course of work of the self-correcting coil of electric system CT measure winding is:
In the present embodiment, the rated transformation ratio of current mutual inductor coil is 3000A:1A, namely wears a circle with a wire at its hub of a spool, and secondary output current should be 1A, and according to waiting ampere-turn principle, when Secondary Winding is 3000 circle, secondary output current should be 1A.
Using the first winding as new winding, the second winding, still as Secondary Winding, the first winding passes into electric current 1A, then the second winding also should produce the electric current of 1A in theory, calculates the current error of the first winding and the circulation of the second winding.The current error data that the second winding calculated when these current error data and current transformer normally being run circulates compare, thus judge whether the second winding is short-circuited or other damage.Current error data when current transformer normally runs can be obtained by the delivery test of current transformer and commissioning test.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.

Claims (5)

1. an electric system self-correcting coil for CT measure winding, described self-correcting coil comprises a winding and Secondary Winding, it is characterized in that, described Secondary Winding comprises the first identical winding of ampere turns and the second winding;
The two ends of described first winding are provided with splicing ear, and the two ends of the second winding are also provided with splicing ear; The middle part of described splicing ear is equipped with a hollow out groove;
Described self-correcting coil also comprises a draw-in groove switch:
When current transformer normally works, described first winding is connected by draw-in groove switch in parallel with the second winding;
When current transformer carries out self-correcting detection, described first winding and the second winding disconnect.
2. the electric system self-correcting coil of CT measure winding as claimed in claim 1, it is characterized in that, described draw-in groove switch comprises insulation button a1, insulation button a2, insulation button b1 and insulation button b2; Described insulation button a1 is connected with insulation button b2 by wire, and insulation button a2 is also connected with insulation button b1 by wire;
Each insulation button is provided with a salient point.
3. the electric system self-correcting coil of CT measure winding as claimed in claim 2, is characterized in that, when the first winding is connected by draw-in groove switch in parallel with the second winding:
The salient point of insulation button a1 embeds in the hollow out groove of the first winding side splicing ear, and the salient point of insulation button b2 embeds in the hollow out groove of the first winding opposite side splicing ear;
The salient point of insulation button b1 embeds in the hollow out groove of the second winding side splicing ear, and the salient point of insulation button a2 embeds in the hollow out groove of the second winding opposite side splicing ear.
4. the electric system self-correcting coil of CT measure winding as claimed in claim 1, is characterized in that, described first winding and the second winding adopt interval and around mode be wound on the iron core of current transformer.
5. the electric system self-correcting coil of CT measure winding as claimed in claim 1, it is characterized in that, the iron core outer setting of described current transformer has protection box.
CN201520554853.XU 2015-07-28 2015-07-28 Self -correcting coil of CT measurement winding for electric power system Active CN204855773U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106291431A (en) * 2016-10-24 2017-01-04 中国科学院上海应用物理研究所 A kind of tracking accuracy measuring method of current sensor
WO2017016370A1 (en) * 2015-07-28 2017-02-02 中国电力科学研究院 Method of designing ultra-high voltage ct coil having self-calibration function
CN107170563A (en) * 2017-05-09 2017-09-15 中国电力科学研究院 A kind of current transformer and its method for self-calibrating with self-calibration function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017016370A1 (en) * 2015-07-28 2017-02-02 中国电力科学研究院 Method of designing ultra-high voltage ct coil having self-calibration function
CN106291431A (en) * 2016-10-24 2017-01-04 中国科学院上海应用物理研究所 A kind of tracking accuracy measuring method of current sensor
CN106291431B (en) * 2016-10-24 2018-11-27 中国科学院上海应用物理研究所 A kind of tracking accuracy measurement method of current sensor
CN107170563A (en) * 2017-05-09 2017-09-15 中国电力科学研究院 A kind of current transformer and its method for self-calibrating with self-calibration function

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