CN102360877A - Dry capacitive electromagnetic type voltage transformer - Google Patents
Dry capacitive electromagnetic type voltage transformer Download PDFInfo
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- CN102360877A CN102360877A CN2011101880113A CN201110188011A CN102360877A CN 102360877 A CN102360877 A CN 102360877A CN 2011101880113 A CN2011101880113 A CN 2011101880113A CN 201110188011 A CN201110188011 A CN 201110188011A CN 102360877 A CN102360877 A CN 102360877A
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Abstract
The invention discloses a dry capacitive electromagnetic type voltage transformer. The dry capacitive electromagnetic type voltage transformer comprises an iron core, a primary winding, and a secondary winding; a high voltage end of the primary winding is provided with an outer electrostatic shield and voltage-sharing shield rings; an earth terminal is provided an inner electrostatic shield; the transformer is characterized in that: the primary winding has a step winding displacement structure; the winding between sections of each step is provided with the voltage-sharing shield ring; and a capacitance shield is arranged between layers of the primary winding and the superposed capacitance of all the voltage-sharing shield rings and the capacitance shields is matched with the capacitance which is required by antiresonance of the transformer. In the transformer, the winding between sections of each step is provided with the voltage-sharing shield ring, and the capacitance shield is arranged between the layers of the winding and the superposed capacitance of all the voltage-sharing shield rings and the capacitance shields is matched with the capacitance which is required by antiresonance of the transformer; the local discharge capacity of the transformer is less than 30pC under voltage of 1.2Um, and is less than 50pC which is required by a national standard, so the important technical problems of electromagnetic type transformer manufacturing industry are solved.
Description
[technical field]
The invention belongs to the electrical installation in a kind of power transmission and transformation line, be specifically related to a kind of dry type and be Capacitive Electromagnetic Voltage Transformer.
[background technology]
At present; In China 35kV level and the following distribution network systems; Remain and adopt the isolated neutral mode, in the electromagnetic potential transformer that is adopted, the ubiquity excitation property is poor, be prone to produce defectives such as ferro resonance and partial discharge quantity be bigger than normal; Especially maximum with ferro resonance to operation power harm, receive it to influence that regular meeting occurs that high voltage fuse blows, equipment is impaired and the phenomenon that causes power failure.Be head it off; Brainstrust has been done long-term and unremitting effort; The conclusion of generally acknowledging is: the supposition electromagnetic potential transformer is a load that is capacitive, just can suppress ferro resonance preferably, and wherein between high-pressure side and earth terminal, inserting high-voltage capacitor is comparatively desirable solution.Chinese patent ZL2006200537961 " dry type is Capacitive Electromagnetic Voltage Transformer " improves by this thinking.The structure of this instrument transformer comprises iron core, winding, secondary winding; Electrostatic shielding and grading ring outside on the high-pressure side of a winding, being provided with; On earth terminal, be provided with interior electrostatic shielding; Its crucial improvements are: between high-pressure side and earth terminal, insert high-voltage capacitor, and outside high-pressure side is provided with electrostatic shielding and grading ring.Facts have proved: between high-pressure side and earth terminal, insert after the high-voltage capacitor; Really the overall capacitance amount and increase capacity current of product have been improved; And play a part antiresonance; Outside high-pressure side is provided with behind electrostatic shielding and the grading ring, help improving before the high-tension coil which floor turn-to-turn and interlayer field intensity, the partial discharge of minimizing product has been measured certain function.But there is following problem in this type product in actual motion: the high-voltage capacitor of access was prone to the slow puncture of generation and causes short circuit after operation a period of time between screen board, therefore have potential safety hazard; Electrostatic shielding and grading ring screen outside high-pressure side is provided with, though reduced partial discharge quantity, but still undesirable.Big factory of domestic a few family also can only reach the 50pC requirement of GB regulation reluctantly as this constructed products partial discharge quantity under 1.2Um voltage.
[summary of the invention]
For solving the problems referred to above that prior art exists; The present invention aims to provide a kind of dry type with novel structure and is Capacitive Electromagnetic Voltage Transformer; This instrument transformer can effectively overcome excitation property poor, be prone to produce defectives such as ferro resonance and partial discharge quantity be bigger than normal; Can not cause the slow breakdown accident of CSET again and cause short circuit, thereby help eliminating the potential safety hazard of distribution network systems.
For realizing above-mentioned purpose; The present invention has adopted following technical scheme: this dry type is Capacitive Electromagnetic Voltage Transformer; Comprise iron core, winding, secondary winding, electrostatic shielding and grading ring outside on the high-pressure side of a said winding, being provided with are provided with interior electrostatic shielding on said earth terminal; It is characterized in that: a said winding is the staged bus-bar construction; On the intersegmental winding of each ladder, be provided with all and press the screen ring, be provided with capacitance plate, and all described capacitances of all pressing overlap capacitance amounts that screen ring and capacitance plate produced and this instrument transformer antiresonance to require are complementary at each interlayer of a said winding.
During practical implementation, the line of the copper conductor of a said winding directly is Ф 0.13mm, and at coil outer diameter one regularly can increase umber of turn one time this moment, strengthens D.C. resistance and falls low magnetic density.
During practical implementation, said capacitance plate is composited by the PMP paper of 0.05mm thickness and the aluminium foil of 0.015mm thickness, and the aluminum foil screen edge is smooth shape.
During practical implementation, said centre all presses the screen ring to be composited by the red copper foil of 0.1mm thickness, the PMP paper of 0.1mm thickness and the semiconductive paper of 0.08mm thickness, all presses the edge of the Width both sides of screen ring to be provided with Ф 4 silicon rubber bars at this.
Beneficial effect: compared with prior art; The present invention is according to the thinking of " the supposition electromagnetic potential transformer is a load that is capacitive; with regard to ability better inhibited ferro resonance "; With winding of staged winding displacement mode coiling, on the intersegmental winding of each ladder, be provided with and all press the screen ring, capacitance plate all is set between winding layers, and make all press the screen ring and the overlap capacitance amount of capacitance plate and the capacitance that this instrument transformer antiresonance requires to be complementary.Thereby solved directly shunt capacitor between high pressure screen and ground connection screen well, be prone between screen board produce slowly puncture and the deficiency that causes short circuit accident, can effectively increase capacitance, reached the requirement that makes instrument transformer be the capacitive antiresonance; Even high pressure end field intensity is improved the instrument transformer surge voltage and is distributed again, reduces partial discharge quantity.Through test determination: this instrument transformer is under 1.2Um, and partial discharge quantity is below the 30pC, less than the requirement of national standard 50pC, thereby has solved the manufacturing great technical barrier of electromagnetic type earthed voltage transformer.
[description of drawings]
For deepening that understanding of the present invention is made further detailed description below in conjunction with accompanying drawing through embodiment.
Fig. 1 is vertical sectional structure sketch map of one embodiment of the invention.
Fig. 2 is the B-B cutaway view of Fig. 1.
Fig. 3 is the electrical schematic diagram of present embodiment.
Fig. 4 is the capacitance plate structure for amplifying sketch map among Fig. 1.
Fig. 5 is the grading ring screen structure for amplifying sketch map among Fig. 1.
Among the figure: primary conductive bar 1, outer electrostatic shielding 2 is all pressed screen ring 3, silicon rubber bar 31, PMP paper 32, Copper Foil 33, semiconductive paper 34, interior electrostatic shielding 4, capacitance plate 5, aluminium foil 51, PMP paper 52,6, inserts A of ground connection inserts, N, unshakable in one's determination 7.
[embodiment]
Referring to Fig. 1, and combine Fig. 2.This dry type is the structure of Capacitive Electromagnetic Voltage Transformer, comprises 7, windings unshakable in one's determination, secondary winding, and the high-pressure side of a winding is provided with outer electrostatic shielding 2 and all presses screen ring 3, electrostatic shielding 4 on earth terminal, being provided with.One time winding adopts the coiling of stairstepping bus-bar construction to form, and has four sections.The laminated core that the permeability magnetic material of 7 employing high-qualitys unshakable in one's determination is processed, the anti-stress of laminated core is strong.One time winding adopts self-binding enamel wire m/3 winding method, and the line of its copper conductor directly is Ф 0.13mm, and at coil outer diameter one regularly can increase umber of turn one time this moment, helps strengthening D.C. resistance and falls low magnetic density.
On the intersegmental winding of each ladder, be provided with all and press screen ring 3, be equipped with capacitance plate 5, and all described capacitances of all pressing overlap capacitance amount that screen ring 3 and capacitance plate 5 produced and the anti-ferro resonance of this instrument transformer to require are complementary at the interlayer of said winding.Calculating through the overlap capacitance amount can reach the coupling requirement, and for example JZWX-35 requirement matching capacitance amount is more than 500pF reaches.
Referring to Fig. 3.Can know from electrical schematic diagram; After adopting many groups all to press the measure of screen ring 3, capacitance plate 5; Greatly increase turn-to-turn, interlayer, intersegmental electric capacity and the direct-to-ground capacitance of instrument transformer, promptly reduced capacitor value and increased capacitance current, can well play the effect that suppresses ferro resonance; Through these major measure, make this type instrument transformer become a brand-new product.On the other hand, evenly the end field intensity is improved surge voltage and is distributed, and has reduced partial discharge quantity, has solved the difficult problem that the local discharging level of 10～35kV electric pressure ground connection electromagnetic potential transformer under 1.2Um voltage is up to state standards.
Referring to Fig. 4.Capacitance plate 5 adopts the aluminium foil 51 of 0.015mm to be composited with 0.05PMP paper 52.Before compound, the equal folding 15mm along the cross direction both sides with aluminium foil 51 makes the edge smooth.When being provided with, be placed on the interlayer of a winding, therebetween or a layer line or two layer lines or multilayer line, the size of looking the required value of its anti-ferro resonance capacitance decides, and plays electric field and the effect that increases the layer capacitance value of being uniformly distributed with.
Referring to Fig. 5.Make and all pressed the screen ring at 3 o'clock; Earlier that the red copper foil 33 of 0.1mm thickness is compound with the PMP paper 32 of 0.1mm thickness; Compound with the semiconductive paper 34 of 0.08mm thickness more afterwards; Placing all pressure screen rings 3 of Φ 4 silicon rubber bars 31 (on the semiconductive paper bag) formation on the edge of its cross direction, in the coiling process, need primary line is welded on the red copper foil 33.
Claims (4)
1. a dry type is Capacitive Electromagnetic Voltage Transformer; Comprise iron core (8), winding, secondary winding; Electrostatic shielding (2) and all press screen ring (3) outside on the high-pressure side of a said winding, being provided with; On said earth terminal, be provided with interior electrostatic shielding (4), it is characterized in that: a said winding is the staged bus-bar construction, on the intersegmental winding of each ladder, is equipped with all to press screen ring (3); Interlayer at a said winding is equipped with capacitance plate (5), and all the described overlap capacitance amount of screen ring (3) and capacitance plate (5) and capacitances of this instrument transformer antiresonance requirement of all pressing are complementary.
2. electromagnetic potential transformer as claimed in claim 1 is characterized in that: the line of the copper conductor of a said winding directly is φ 0.13mm.
3. electromagnetic potential transformer as claimed in claim 1 is characterized in that: said capacitance plate (5) is composited by the PMP paper (52) of 0.05mm thickness and the aluminium foil (51) of 0.015 thickness, and the aluminum foil screen edge is smooth shape.
4. electromagnetic potential transformer as claimed in claim 1; It is characterized in that: said grading ring screen (3) is composited by the red copper foil (33) of 0.1mm thickness, the PMP paper (32) of 0.1mm thickness and the semiconductive paper of 0.08mm thickness, all presses the edge of the Width both sides of screen ring (3) to be provided with φ 4 silicon rubber bars (31) at this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101880113A CN102360877A (en) | 2011-07-06 | 2011-07-06 | Dry capacitive electromagnetic type voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101880113A CN102360877A (en) | 2011-07-06 | 2011-07-06 | Dry capacitive electromagnetic type voltage transformer |
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| CN102360877A true CN102360877A (en) | 2012-02-22 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325556A (en) * | 2013-06-05 | 2013-09-25 | 国家电网公司 | Novel high voltage standard integrated voltage transformer |
| CN104157437A (en) * | 2014-08-07 | 2014-11-19 | 正泰电气股份有限公司 | Electromagnetic voltage transformer with insulation function through capacitive impedance epoxy resin casting |
| CN106053913A (en) * | 2016-05-03 | 2016-10-26 | 北京铁道工程机电技术研究所有限公司 | Field bus type AC current transformer |
| CN106226576A (en) * | 2016-05-03 | 2016-12-14 | 北京铁道工程机电技术研究所有限公司 | A kind of field bus type AC voltage transformer |
| CN107578905A (en) * | 2017-10-17 | 2018-01-12 | 天津市百利纽泰克电气科技有限公司 | A kind of structure and method for improving voltage transformer partial discharge performance |
| CN107808763A (en) * | 2017-11-29 | 2018-03-16 | 大连北方互感器集团有限公司 | Voltage transformer primary winding high-tension shielding apparatus and preparation method thereof |
| CN109086562A (en) * | 2018-10-09 | 2018-12-25 | 云南电网有限责任公司红河供电局 | A kind of anti-resonant electromagnetic formula voltage transformer of high-damping and mutual sensing method |
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2011
- 2011-07-06 CN CN2011101880113A patent/CN102360877A/en active Pending
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| CN2743950Y (en) * | 2004-11-24 | 2005-11-30 | 江苏精科互感器有限公司 | Voltage transformer with resonance resisting capacity |
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| 李志勇等: "35kV环氧浇注电压互感器局放的分析", 《变压器》, vol. 42, no. 10, 31 October 2005 (2005-10-31), pages 8 - 11 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325556A (en) * | 2013-06-05 | 2013-09-25 | 国家电网公司 | Novel high voltage standard integrated voltage transformer |
| CN104157437A (en) * | 2014-08-07 | 2014-11-19 | 正泰电气股份有限公司 | Electromagnetic voltage transformer with insulation function through capacitive impedance epoxy resin casting |
| CN106053913A (en) * | 2016-05-03 | 2016-10-26 | 北京铁道工程机电技术研究所有限公司 | Field bus type AC current transformer |
| CN106226576A (en) * | 2016-05-03 | 2016-12-14 | 北京铁道工程机电技术研究所有限公司 | A kind of field bus type AC voltage transformer |
| CN107578905A (en) * | 2017-10-17 | 2018-01-12 | 天津市百利纽泰克电气科技有限公司 | A kind of structure and method for improving voltage transformer partial discharge performance |
| CN107808763A (en) * | 2017-11-29 | 2018-03-16 | 大连北方互感器集团有限公司 | Voltage transformer primary winding high-tension shielding apparatus and preparation method thereof |
| CN109086562A (en) * | 2018-10-09 | 2018-12-25 | 云南电网有限责任公司红河供电局 | A kind of anti-resonant electromagnetic formula voltage transformer of high-damping and mutual sensing method |
| CN109086562B (en) * | 2018-10-09 | 2023-09-12 | 云南电网有限责任公司红河供电局 | High-damping anti-resonance electromagnetic voltage transformer and mutual inductance method |
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Application publication date: 20120222 |