CN102496446B - Zero magnetic flux direct-current current transformer - Google Patents
Zero magnetic flux direct-current current transformer Download PDFInfo
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- CN102496446B CN102496446B CN201110387916.3A CN201110387916A CN102496446B CN 102496446 B CN102496446 B CN 102496446B CN 201110387916 A CN201110387916 A CN 201110387916A CN 102496446 B CN102496446 B CN 102496446B
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Abstract
The invention provides a zero magnetic flux direct-current current transformer, which comprises a high-voltage body shell, wherein a supporting insulation element is fixed inside the high-voltage body shell, the supporting insulation element is provided with a coil shielding body, and a secondary coil is wrapped inside the coil shielding body; a primary winding passes through a geometric center of the secondary coil and the coil shielding body; the secondary coil comprises an annular iron core T1, an annular iron core T2 and an annular iron core T3; an alternative-current coil N3 is wound on the annular iron core T1; and an excited magnetic coil N1 is wound on the annular ion core T2, and an excited magnetic coil N2 is wound on the annular iron core T3. The zero magnetic flux direct-current current transformer has good full-range linearity, high precision, wide frequency band and large dynamic range.
Description
[technical field]
The present invention relates to high-voltage direct current fields of measurement, particularly a kind of Zero magnetic flux direct-current current transformer.
[background technology]
High voltage direct current transmission is developed rapidly in China, adopts traditional electromagnetic type DC current transformer or DC electronic current transformer in the DC transmission system of most.Although the basic satisfied requirement of measuring in performance, its certainty of measurement is lower.And DC electronic current transformer adopts shunt to gather DC current signal, due to the impact of temperature and manufacturing technology level, limited the precision of shunt.
[inventing type content]
The object of this invention is to provide a kind of Zero magnetic flux direct-current current transformer, to solve the problems of the technologies described above.
In order to address the above problem, the present invention adopts following technical scheme:
A kind of Zero magnetic flux direct-current current transformer, comprises the high pressure body, in the high pressure body, is fixed with support insulators, and support insulators is provided with coil shield, in coil shield, is coated with secondary coil; One time winding passes from the geometric center of secondary coil and coil shield; Described secondary coil comprises annular core T1, annular core T2 and annular core T3; On annular core T1, turn to AC coil N3; On annular core T2, turn to magnetizing coil N1, on annular core T3, turn to magnetizing coil N2.
Described AC coil N3, magnetizing coil N1 and magnetizing coil N2 are contained in magnetic screen box; The material of magnetic screen box is silicon steel.
Described annular core T1, annular core T2 are identical with annular core T3 physical dimension, and external diameter is 420mm, and internal diameter is 400mm, are highly 10mm; Annular core T2 and annular core T3 turn to by the thick permalloy thin coiled stock of 0.1mm, and Magnetic Phase is same; Annular core T1 reels and makes with the thick silicon steel thin belt of 0.35mm.
It is upper that described magnetizing coil N1 is uniformly distributed in annular core T2, and it is upper that magnetizing coil N2 is uniformly distributed in annular core T3, and the winding method of magnetizing coil N1 and magnetizing coil N2 is identical with the number of turn.
Described AC coil N3, magnetizing coil N1 and magnetizing coil N2 are stacked in magnetic screen box with one heart, and described magnetizing coil N1 and magnetizing coil N2 are stacked in magnetic screen box by differential mode.
Described AC coil N3, magnetizing coil N1 and the each half-stack package of magnetizing coil N2 periphery have one deck insulating paper; Described AC coil N3, magnetizing coil N1 and the common half lap of magnetizing coil N2 periphery are surrounded by two-layer insulating paper.
Described magnetic screen box periphery is wound with compensation winding W2, and compensation winding W2 is by the enamelled wire of diameter 1.0mm around forming, and its number of turn is 6000 circles.
Described magnetizing coil N1, magnetizing coil N2, AC coil N3 are that the coiling of 0.5mm enamelled wire forms by diameter, and its number of turn is 1500 circles.
Described Zero magnetic flux direct-current current transformer also comprises base and insulator insulator, and described insulator insulator is fixedly connected with base with the described high pressure body.
With respect to prior art, the present invention has the following advantages: the features such as a kind of Zero magnetic flux direct-current current transformer of the present invention guarantees that the omnidistance linearity is good, precision is high in the following manner, bandwidth, dynamic range are large.1. field core adopts the larger permalloy of initial permeability to be placed in the shielding box T5 rolling with 0.35mm silicon steel thin belt as core material with by iron core, thereby reduces the magnetic error that remanent magnetism causes.2. adoption rate, integration, derivative controller and PID controller calculate controlled quentity controlled variable and implement automatic high speed and follow the tracks of, adjust, and it carries out dynamic equilibrium adjustment, makes iron core all the time in " dynamic zero magnetic flux state ".3. adopt the integrated operational amplifier of high-gain and high voltage build-up rate.
[accompanying drawing explanation]
Fig. 1 is contour structures schematic diagram of the present invention;
Fig. 2 is the structural representation of secondary coil of the present invention;
Fig. 3 is schematic diagram of the present invention.
[embodiment]
Below in conjunction with accompanying drawing, type of the present invention is described in further detail.
Refer to shown in Fig. 1, the base 7 support bushing insulators 6 of Zero magnetic flux direct-current current transformer of the present invention, on insulator insulator 6, be fixed with the high pressure body 1, support insulators 5 is housed in the high pressure body 1, support insulators 5 support coils shieldings 3, secondary coil 4 use epoxy glues are fixed in coil shielding 3, and one time winding 2 passes from the geometric center of secondary coil 4 and coil shielding 3.Support insulators 5 plays high-low pressure insulating effect simultaneously.
Refer to shown in Fig. 2, Zero magnetic flux direct-current current transformer secondary coil 4, by three windings, formed, field core T2 (45), field core T3 (48) is separately fixed at protection box 46, in 49, magnetizing coil N1 (47) is outside field core T2 (45), magnetizing coil N2 (410) is outside field core T3 (48), AC coil N3 (42) is around exchanging outside T1 unshakable in one's determination (41), three coils (47, 410, 42) be all fixed in the magnetic screen box T5 being coiled into by 0.35mm silicon-steel sheet coiled, T5 magnetic screen box is by upper cover plate 43, inner cover plate 44, lower cover 411, outer cover plate 412 forms, upper cover plate 43, inner cover plate 44, lower cover 411, outer cover plate 412 rolls by the thick silicon steel thin belt of 0.35mm.
Field core T2 (45) is identical with field core T3 (48) physical dimension, external diameter Φ 420mm, internal diameter Φ 400mm, height 10mm.Field core (45,48) by the thick permalloy thin coiled stock of thickness 0.1mm around, require simultaneously Magnetic Phase with.The winding of magnetizing coil N1 (47) and magnetizing coil N2 (410) by diameter of phi 0.5mm enamelled wire respectively around 1500 circles.During coiling, coil is evenly distributed on whole annulus unshakable in one's determination, and the coil winding on two iron cores is identical, and the number of turn is just the same.With the thick silicon steel thin belt of 0.35mm, reel and exchange T1 unshakable in one's determination (41), its external diameter is Φ 400mm, and internal diameter is Φ 380mm, is highly 7mm.Diameter of phi 0.5mm enamelled wire is exchanging the upper coiling winding W1 of T1 unshakable in one's determination (41), and winding W1 is 1500 circles, becomes AC coil N3 (42).
At the each half-stack package one deck insulating paper of the magnetizing coil N1 (47) winding above, magnetizing coil N2 (410) and AC coil N3 (42) outside; play insulation protection effect; then these three coils are stacked together by concentric manner; wherein two magnetizing coil N1 (47) and magnetizing coil N2 (410) stack by differential mode; magnetizing coil N1, magnetizing coil N2 and tri-coils of AC coil N3 are put into shielding box T5, at the two-layer insulating paper of the outside of shielding box T5 half-stack package.Finally at the skin of shielding box T5, with the enamelled wire coiling of Φ 1.0mm, compensate winding W2, its number of turn is 6000 circles.The two-layer insulating paper of half-stack package again after complete.
Refer to shown in Fig. 3, Zero magnetic flux direct-current current transformer comprises three ring-shaped cores (T1, T2, T3).Field core T2 and T3 are a pair of magnetic characteristic and the identical magnet ring of physical dimension, and W3 and W4 are respectively the field windings of T2 and T3.Excitatory with symmetrical sine-wave current, all penetration depth is saturated to make field core T2 and T3.The winding of field core T2 and T3 is to be connected like this, for AC excitation winding, and one of them iron core, total direct current flux is consistent with exchange flux direction, and another is unshakable in one's determination upper, total direct current flux and exchange flux opposite direction.Total direct current flux is the algebraical sum of magnetic flux and the magnetic flux that balanced balanced current I2 produces of primary current I1 generation, i.e. W1I1-W2I2.When iron core is during without DC magnetizing, the flux change that exciting curent produces is symmetrical.When iron core has DC magnetizing, the total BH curve symmetry of field core T2 and T3 is damaged, and produces even-order harmonic.Even-order harmonic amplitude and phase place reflect the size and Orientation of D.C. magnetic field.Magnetic flux in two iron cores, wherein odd harmonic component amplitude equates, phase place is identical.And even-order harmonic component amplitude equates, single spin-echo.W3 and W4 winding are also done to detect winding simultaneously, and because these two windings are differential concatenations, the odd harmonic of induced voltage is cancelled out each other, and even-order harmonic superposes mutually, by the current waveform of load resistance, produces distortion.This distortion voltage converts current signal I2 to after voltage amplifier, band pass filter, synchronous demodulator, PID control and power amplifier, send into balance winding W2, the magnetomotive force of its generation and magnetomotive force that measured current I 1 produces are compared, thereby measure measured current I 1.
Claims (9)
1. a Zero magnetic flux direct-current current transformer, it is characterized in that, comprise the high pressure body (1), in the high pressure body (1), be fixed with support insulators (5), support insulators (5) is provided with coil shield (3), is coated with secondary coil (4) in coil shield (3); A winding (2) passes from the geometric center of secondary coil (4) and coil shield (3); Described secondary coil (4) comprises annular core T1, annular core T2 and annular core T3; On annular core T1, be wound with AC coil N3; On annular core T2, be wound with magnetizing coil N1, on annular core T3, be wound with magnetizing coil N2; Described annular core T2, annular core T3 are separately fixed in the first protection box (46), the second protection box (49).
2. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 1, is characterized in that, described AC coil N3, magnetizing coil N1 and magnetizing coil N2 are contained in magnetic screen box; The material of magnetic screen box is silicon steel.
3. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 2, is characterized in that, described annular core T1, annular core T2 are identical with annular core T3 physical dimension, and external diameter is 407mm, and internal diameter is 393mm, is highly 7mm; Annular core T2 and annular core T3 turn to by the thick permalloy thin coiled stock of 0.1mm, and Magnetic Phase is same; Annular core T1 reels and makes with the thick silicon steel thin belt of 0.35mm.
4. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 3, it is characterized in that, it is upper that described magnetizing coil N1 is uniformly distributed in annular core T2, and it is upper that magnetizing coil N2 is uniformly distributed in annular core T3, and the winding method of magnetizing coil N1 and magnetizing coil N2 is identical with the number of turn.
5. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 4, it is characterized in that, described AC coil N3, magnetizing coil N1 and magnetizing coil N2 are stacked in magnetic screen box with one heart, and described magnetizing coil N1 and magnetizing coil N2 are stacked in magnetic screen box by differential mode.
6. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 5, is characterized in that, described AC coil N3, magnetizing coil N1 and the each half-stack package of magnetizing coil N2 periphery have one deck insulating paper; Described AC coil N3, magnetizing coil N1 and the common half lap of magnetizing coil N2 periphery are surrounded by two-layer insulating paper.
7. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 5, is characterized in that, described magnetic screen box periphery is wound with compensation winding N4, and compensation winding N4 is by the enamelled wire of diameter 1.0mm around forming, and its number of turn is 6000 circles.
8. a kind of Zero magnetic flux direct-current current transformer as claimed in claim 1, is characterized in that, described magnetizing coil N1, magnetizing coil N2 are that the coiling of 0.5mm enamelled wire forms by diameter, and its number of turn is 1500 circles.
9. a kind of Zero magnetic flux direct-current current transformer as described in any one in claim 1 to 8, it is characterized in that, described Zero magnetic flux direct-current current transformer also comprises base (7) and insulator insulator (6), and described insulator insulator (6) is fixedly connected with base (7) with the described high pressure body (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110387916.3A CN102496446B (en) | 2011-11-29 | 2011-11-29 | Zero magnetic flux direct-current current transformer |
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| CN201110387916.3A CN102496446B (en) | 2011-11-29 | 2011-11-29 | Zero magnetic flux direct-current current transformer |
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| CN102496446A CN102496446A (en) | 2012-06-13 |
| CN102496446B true CN102496446B (en) | 2014-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017016769A1 (en) * | 2015-07-24 | 2017-02-02 | Siemens Aktiengesellschaft | Zero flux current transformer |
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| CN103632826B (en) * | 2012-08-23 | 2018-01-16 | 西门子公司 | Current transformer and current sensing means |
| CN105304303B (en) * | 2015-09-30 | 2017-08-04 | 中国计量科学研究院 | A kind of accurate alterating and direct current current transformer |
| CN106018912A (en) * | 2016-05-23 | 2016-10-12 | 北京柏艾斯科技有限公司 | High-precision universal alternative and direct current measuring device |
| CN107817372B (en) * | 2017-12-14 | 2023-10-27 | 华中科技大学 | Direct current and alternating current heavy current sensing head and metering device |
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| CN110676038A (en) * | 2018-07-02 | 2020-01-10 | 福迪威（上海）工业仪器技术研发有限公司 | Current transformer |
| DE102018219803A1 (en) * | 2018-11-19 | 2020-05-20 | Siemens Aktiengesellschaft | Current transformer module for a switchgear and corresponding switchgear |
| CN114113737B (en) * | 2021-11-30 | 2023-05-23 | 江苏科兴电器有限公司 | 150kV zero-flux direct current transformer |
| CN114284047B (en) * | 2022-03-04 | 2022-06-14 | 山西省机电设计研究院有限公司 | Open-close bus type high-precision zero-flux current transformer and error compensation method |
| CN114660370B (en) * | 2022-05-20 | 2022-11-01 | 保定天威保变电气股份有限公司 | Copper magnetic shielding measuring device under harmonic and direct current combined excitation |
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| US4117437A (en) * | 1976-07-02 | 1978-09-26 | Asea Aktiebolag | Top core type current transformer structure |
| EP0658271B1 (en) * | 1992-09-02 | 1996-04-24 | Siemens Aktiengesellschaft | Current transformer |
| CN1547224A (en) * | 2003-12-15 | 2004-11-17 | 上海电器科学研究所（集团）有限公司 | A DC current transformer |
| CN2667632Y (en) * | 2003-12-01 | 2004-12-29 | 王日新 | Inverted dry type high voltage current mutual inductor |
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2011
- 2011-11-29 CN CN201110387916.3A patent/CN102496446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4117437A (en) * | 1976-07-02 | 1978-09-26 | Asea Aktiebolag | Top core type current transformer structure |
| EP0658271B1 (en) * | 1992-09-02 | 1996-04-24 | Siemens Aktiengesellschaft | Current transformer |
| CN2667632Y (en) * | 2003-12-01 | 2004-12-29 | 王日新 | Inverted dry type high voltage current mutual inductor |
| CN1547224A (en) * | 2003-12-15 | 2004-11-17 | 上海电器科学研究所（集团）有限公司 | A DC current transformer |
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| WO2017016769A1 (en) * | 2015-07-24 | 2017-02-02 | Siemens Aktiengesellschaft | Zero flux current transformer |
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| CN102496446A (en) | 2012-06-13 |
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