CN205069359U - Special high tension current transformer with simplify error measurement function - Google Patents

Special high tension current transformer with simplify error measurement function Download PDF

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Publication number
CN205069359U
CN205069359U CN201520856846.5U CN201520856846U CN205069359U CN 205069359 U CN205069359 U CN 205069359U CN 201520856846 U CN201520856846 U CN 201520856846U CN 205069359 U CN205069359 U CN 205069359U
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China
Prior art keywords
winding
current transformer
current
test
error
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CN201520856846.5U
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Inventor
王欢
项琼
冯宇
岳长喜
徐思恩
汪泉
刘浩
王雪
陈泽远
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The utility model provides a special high tension current transformer with simplify error measurement function, current transformer includes: iron core, primary winding N1 and secondary winding, secondary winding includes: experimental winding N2 and test winding nt, coiling primary winding N1 and experimental winding N2 on the iron core, the even coiling of test winding nt is outside at experimental winding N2, is equipped with the insulating film between two windings and keeps apart. The utility model provides a special high tension current transformer with simplify error measurement function: when carrying out the test of the on -the -spot error of special high tension current transformer, greatly reduced the work load of special high tension current transformer test error, the liberation manpower and materials improve work efficiency, the utility model discloses a special high tension current transformer not only can use in special high tension current transformer carries out on -the -spot commissioning test, checies during also can being used for.

Description

A kind of ultra high voltage current transformer with simplification error measurement function
Technical field
The utility model relates to a kind of current transformer, is specifically related to a kind of ultra high voltage current transformer with simplification error test function.
Background technology
Current transformer as electric power meter is the important evidence of assessment economy operation of power grid.Along with the lifting of electric pressure, a winding side rated current of current transformer constantly increases, and reaches 6000A in 1000kV AC extra high voltage engineering current transformer rated current used.The current mutual inductor coil that current extra-high voltage project uses test error all in a pre-installation, if comparison method test error characteristic will be used after current transformer is installed, then need by two outlet casing tubes of GIS, outside it, access the equipment such as standard current transformer 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, by means of ground connection banister, because its through-current capacity only has hundreds of ampere, so can not carry out error testing under stable state big current (greatly about 3000A ~ 6000A).This method requires when carrying out error testing that the equipment such as circuit breaker, isolating switch is formed according to big current loop and carries out design operation, and this has higher requirement to device fabrication unit.Simultaneously because test loop is long especially, the capacity requirement of big current current lifting device is often greater than the capacity limit value of MVA current transformer itself, causes test unit to there is larger burden in equipment investment and human input.
Utility model content
For overcoming above-mentioned defect, the utility model provides a kind of ultra high voltage current transformer with simplification error measurement function, simplifies electric power transformer field commissioning test medial error measuring process, will greatly improve maintenance work efficiency.
For achieving the above object, concrete technical scheme of the present utility model is as follows:
Have a ultra high voltage current transformer for simplification error measurement function, described current transformer comprises: iron core, a winding N 1and secondary winding, described secondary winding comprises: the test winding N of coiling on described iron core 2with test winding N t;
Described test winding N twith test winding N 2between be provided with dielectric film isolation, described test winding N tthe number of turn be 100 circles.
Described test winding N 2for tapped structure, tap common port is S0, and non-polar end tap is respectively S1, S2 and S3, wherein a winding S0-S1 and winding N 1current ratio be 1500/1A, a winding S0-S2 and winding N 1current ratio be 3000/1A, a winding S0-S3 and winding N 1current ratio be 6000/1A.
During normal operation, a described winding N 1for input, test winding N 2for output, test winding N tbe connected with portable protective gaps.
During error testing, test winding N tas a winding, test winding N 2as secondary winding, composition temporary current instrument transformer, described temporary current instrument transformer and external standard current transformer carry out error testing;
The current ratio of described external standard current transformer is consistent with the current ratio of temporary current instrument transformer.
During error testing, external have the standard current transformer that current ratio is 15/1A, 30/1A and 60/1A no-load voltage ratio, and the accuracy class of described standard current transformer is 0.05 grade.
During error testing, current ratio is the test winding N of the current transformer of 1500/1A ttwo terminals be a winding switching of the standard current transformer of 15/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 15/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 15/1A.
During error testing, current ratio is the test winding N of the current transformer of 3000/1A ttwo terminals be a winding switching of the standard current transformer of 30/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 30/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 30/1A.
During error testing, current ratio is the test winding N of the current transformer of 6000/1A ttwo terminals be a winding switching of the standard current transformer of 60/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 60/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 60/1A.
With immediate prior art ratio, the utility model has following beneficial effect:
When carrying out ultra high voltage current mutual inductor on site error testing, not needing the large-scale current lifting device of multiple stage, precision standard current transformer, greatly reducing the workload of ultra high voltage current transformer test error, liberation manpower and materials, increase work efficiency;
Increase test winding in conventional ultra high voltage current transformer inside, utilization waits ampere-turn principle to reach by increasing the number of turn object reducing electric current, is transformed by big current error test and carries out under small area analysis;
Ultra high voltage current transformer of the present invention not only can carry out using in on-the-spot commissioning test at ultra high voltage current transformer, also may be used for period verification.
Accompanying drawing explanation
Fig. 1 is the structural representation of secondary winding in current transformer.
Fig. 2 is the structural representation of current transformer test winding.
Fig. 3 is current transformer error test schematic diagram.
Embodiment
A kind of ultra high voltage current transformer device with simplification error test function.
Fig. 1 is tapped ultra high voltage current transformer circuit, and wherein S0-S1 is 1500/1A, S0-S2 be 3000/1A, S0-S3 is 6000/1A.Fig. 2 gives the ultra high voltage current transformer line map with simplification error test function.N 1be a winding, N 2for test winding, N tfor test winding.When current transformer normally works, N 2for exporting winding, N tconnect electric discharge device; When carrying out error testing, by N twinding as a winding, N 2winding is as secondary winding, and composition temporary current instrument transformer participates in error testing.Error testing circuit as shown in Figure 3, N twinding and external standard current transformer winding polarity end docks, N 2winding docks with external standard current transformer secondary winding polar end.
There is the ampere-turn principles such as the ultra high voltage current transformer device employing of simplification error test function, for 3000/1A bus style current transformer, test philosophy is described.The ultra high voltage current transformer primary current with simplification error test function is 3000A, and number of ampere turns is 1 circle, and secondary current is 1A, and number of ampere turns is 3000 circles, and secondary winding is N 2, i.e. N 2be 3000 circles.N tbe 100 circles, N ton the rated current 30A that passes through, adopt that multiply is flat is evenly wound on outside around mode.When current transformer normally works, N 2winding is that secondary exports winding, and its number of ampere turns is 3000 ampere-turns, is once punching 1 circle 3000A; When carrying out error testing, N 2winding still exports winding for secondary, and the rated current passed through is 1A, and number of ampere turns is 3000 ampere-turns, N twinding is as a winding, and the rated current passed through is 30A, and number of ampere turns is 3000 ampere-turns.Known according to design, under normal work and error testing state, first and second is all that 3000 ampere-turns are constant, and namely employings waits ampere-turn principle by increasing the number of turn with reaching the order of reduction current value.
To 3000/1A, secondary load 15VA, when the current transformer of power factor (PF) 1.0 carries out error testing, its secondary voltage is 15V, needs capacity to be the current lifting device of 45kVA.Current separate unit current lifting device is generally 20kVA, namely will meet and carry out error test when rated current 120%, needs at least 3 current lifting device series connection to use.When employing waits ampere-turn method, when primary current is reduced to 30A, secondary voltage is that 15V is constant, and total capacity is reduced to 0.45kVA, and employing capacity is the error testing work that the little current lifting device of 1kVA can complete this current transformer.Therefore, there is the power current transformer of simplification error test function when carrying out error testing, the little current lifting device of external 1kVA is only needed to join 0.05 grade of 30/1A standard current transformer, greatly reducing power current transformer, is once particularly the site error test job of the current transformer of big current.
For extra-high voltage project Current Transformer, its coil dimension is comparatively large, easily disturbs by external magnetic field.In addition, because the transient current produced when system caters to process and system short-circuit state can reach 50kA to 63kA, the transient transcendence formed can produce electrodynamic action to CT coil soft magnetic material, performance core of safety valve in gas-fired instrument material is caused to produce striction phenomenon in transient process, local magnetic permeability changes, and also can produce strong thermal stress etc.For this situation, ultra high voltage Current Transformer coil outer can adopt the means of screen or balance winding to alleviate the inconsistent phenomenon of current mutual inductor coil each several part magnetic flux usually.
It is to be understood that, the utility model content and embodiment be intended to prove the utility model the practical application of technical scheme is provided, should not be construed as the restriction to the utility model protection range.Those skilled in the art, under spirit of the present utility model and principle inspire, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.

Claims (8)

1. have a ultra high voltage current transformer for simplification error measurement function, described current transformer comprises: iron core, a winding N 1and secondary winding, it is characterized in that: described secondary winding comprises: the test winding N of coiling on described iron core 2with test winding N t;
Described test winding N twith test winding N 2between be provided with dielectric film isolation, described test winding N tthe number of turn be 100 circles.
2. current transformer according to claim 1, is characterized in that: described test winding N 2for tapped structure, tap common port is S0, and non-polar end tap is respectively S1, S2 and S3, wherein a winding S0-S1 and winding N 1current ratio be 1500/1A, a winding S0-S2 and winding N 1current ratio be 3000/1A, a winding S0-S3 and winding N 1current ratio be 6000/1A.
3. current transformer according to claim 1, is characterized in that: when normally running, a described winding N 1for input, test winding N 2for output, test winding N tbe connected with portable protective gaps.
4. current transformer according to claim 1, is characterized in that: during error testing, test winding N tas a winding, test winding N 2as secondary winding, composition temporary current instrument transformer, described temporary current instrument transformer and external standard current transformer carry out error testing;
The current ratio of described external standard current transformer is consistent with the current ratio of temporary current instrument transformer.
5. current transformer according to claim 1, is characterized in that: during error testing, and external have the standard current transformer that current ratio is 15/1A, 30/1A and 60/1A no-load voltage ratio, and the accuracy class of described standard current transformer is 0.05 grade.
6. current transformer according to claim 1, is characterized in that: during error testing, and current ratio is the test winding N of the current transformer of 1500/1A ttwo terminals be a winding switching of the standard current transformer of 15/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 15/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 15/1A.
7. current transformer according to claim 1, is characterized in that: during error testing, and current ratio is the test winding N of the current transformer of 3000/1A ttwo terminals be a winding switching of the standard current transformer of 30/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 30/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 30/1A.
8. current transformer according to claim 1, is characterized in that: during error testing, and current ratio is the test winding N of the current transformer of 6000/1A ttwo terminals be a winding switching of the standard current transformer of 60/1A respectively with current ratio; Test winding N 2polar end and current ratio are access the K terminal of error of measurement formula mutual-inductor tester HE after the polar end of the secondary winding side of the standard current transformer of 60/1A is connected; Test winding N 2non-polar end through the Tx terminal of Burden box access error of measurement formula mutual-inductor tester HE; Current ratio is the To terminal of the non-polar end access error of measurement formula mutual-inductor tester HE of the secondary winding side of the standard current transformer of 60/1A.
CN201520856846.5U 2015-10-29 2015-10-29 Special high tension current transformer with simplify error measurement function Active CN205069359U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405468A (en) * 2016-09-05 2017-02-15 国网天津市电力公司 Extra-high voltage transformer verification method using switching device
CN107544045A (en) * 2016-06-24 2018-01-05 中国电力科学研究院 A kind of system and method for being detected to self-correcting type current transformer error

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107544045A (en) * 2016-06-24 2018-01-05 中国电力科学研究院 A kind of system and method for being detected to self-correcting type current transformer error
CN107544045B (en) * 2016-06-24 2020-04-17 中国电力科学研究院 System and method for detecting error of self-correcting current transformer
CN106405468A (en) * 2016-09-05 2017-02-15 国网天津市电力公司 Extra-high voltage transformer verification method using switching device

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