CN105699725A - Connecting flange of equipotential shielded capacitive voltage transformer - Google Patents
Connecting flange of equipotential shielded capacitive voltage transformer Download PDFInfo
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- CN105699725A CN105699725A CN201410682103.0A CN201410682103A CN105699725A CN 105699725 A CN105699725 A CN 105699725A CN 201410682103 A CN201410682103 A CN 201410682103A CN 105699725 A CN105699725 A CN 105699725A
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- 239000003990 capacitor Substances 0.000 claims abstract description 98
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 8
- 239000002355 dual-layer Substances 0.000 abstract 1
- 239000012212 insulator Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005350 ferromagnetic resonance Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The invention relates to a connecting flange of an equipotential shielded capacitive voltage transformer. The connecting flanges are installed on two ends of each section of a capacitor unit. An O-shaped ring sealing groove is designed in an end surface of the connecting flange, and O-shaped rings of corresponding specifications are used in cooperation, and therefore, the sealing of the capacitor unit can be realized; a circular hole is designed in the center of the connecting flange; a main capacitor supporting insulator is inserted into the circular hole vertically; and dual-layer reliable sealing of a node is realized through the sealing design of the axial O-shaped ring on the end surface and the radial O-shaped ring on the inner side surface of the connecting flange. With the connecting flange provided by the invention adopted, difficulties in assembly, storage and sealing of the capacitor unit can be eliminated, and electrical connection of a shielded capacitor inside the capacitor unit can be realized while serving as an electrode on the condition of satisfying a requirement for mechanical strength.
Description
Technical field
The present invention relates to a kind of power system transformer device, in particular to the adpting flange of a kind of equal potential shielded capacitor voltage transformer。
Background technology
Along with extra-high voltage (exchange 1000kV and more than) technology of transmission of electricity application in engineering, it is necessary to accurately measure extra-high voltage grid voltage and corresponding technical equipment。The wide variety of power frequency high voltage meter of power system mainly has electromagnetic potential transformer and capacitance type potential transformer two kinds (both of which belongs to passive voltage and measures system), substantially disclosure satisfy that 500kV and the requirement of following electric pressure voltage measurement and relay protection。Belong to active voltage the measurement Optical Potential Transformer of system, electronic type voltage transformer to be also at present in research and development and trail run process, the problems such as voltage measurement accuracy, laser life-span, system reliability need to be researched and solved further。
Due to the difficulty that insulate, so electromagnetic potential transformer seldom adopts in the electrical network of ultra-high/extra-high voltage grade。Due to capacitance type potential transformer (CVT) simple in construction, reliability is high, cost is relatively low, is still the capital equipment of ultra-high/extra-high voltage level Grid voltage measurement。But, the design of domestic and international existing CVT is applied to extra-high voltage grid, there is following technical difficulty:
1) stray capacitive currents affects accuracy of measurement:
Traditional capacitance type potential transformer (CVT), owing to there is stray capacitance between capacitive divider high-voltage arm and grounding body or electrical body around, under action of high voltage, stray capacitive currents flows out or flows into high-voltage arm, causes voltage measurement error。This error strengthens along with increasing of electric pressure。NORTHWEST CHINA 750kV electrical network capacitance type potential transformer measured result, the measurement error that stray electrical current (includes capacitance current and insulation sleeve surface leakage current) and causes may be up to more than 0.2%。Electric Field Simulation shows, the CVT of 1000kV, flows into the capacitance current of the earth up to 20mA from potentiometer high-voltage arm, causes significant measurement error。The measure strengthening potentiometer main capacitance amount is generally adopted to reduce the impact of stray electrical current, even if capacitance increases to the class of accuracy also difficult standard reaching 0.1 grade of 10000pf, extra-high voltage CVT。
2) on-the-spot effect difficulty:
Existing CVT measurement error is subject to stray capacitance influences, thus relevant with installation site。After the CVT of ultra-high/extra-high voltage electric pressure installs at the scene, it is necessary to carry out on-the-spot effect, in order to revise the ratio and angular difference that measure when dispatching from the factory。The on-the-spot effect carrying out transformer at ultra-high voltage transformer station is by no means easy。Except extra-high voltage reference capacitor manufacture difficulty, the on-the-spot electromagnetic interference of ultra-high voltage transformer station be also by the important restriction factor of on-the-spot accurately effect comparison。
3) CVT response characteristic problem:
The response characteristic of voltage transformer is proposed increasingly higher requirement by the extensive use of digital relay protection system, it is desirable to transformer secondary voltage should quick and precisely reflect the change of primary voltage。Relevant regulatory requirements, after transformer primary shorted to earth, secondary voltage should be down to less than the 0.1 of initial value within 0.2 second。Existing CVT all adopts the ferromagnetic resonance antivibrator that energy-storage travelling wave tube forms, to suppress issuable ferromagnetic resonance in electromagnetic unit。The introducing of energy-storage travelling wave tube makes the response characteristic of transformer be deteriorated, it is difficult to meet the requirement of extra-high voltage grid relay protection quick and precisely action。
For this series of problem, it is proposed that equal potential shielded capacitor voltage transformer, this transformer has high accuracy, quickly responds, exempts from the feature of on-the-spot effect。Equal potential shielded capacitor voltage transformer has the structure of uniqueness compared to tradition CVT, by equal potential shielded capacitor voltage transformer carrying out reasonable computation and Design of Mechanical Structure to meet the requirements such as electric, the mechanical strength of equivalent potential screen CVT。How realizing the equal potential shielded capacitor voltage transformer assembling between container unit of respectively economizing on electricity is a difficult problem。
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide the adpting flange of a kind of equal potential shielded capacitor voltage transformer, successfully solve capacitor unit to assemble, deposit and seal a difficult problem, while meeting requirement of mechanical strength, achieve again the electrical connection of capacitor unit internal shield capacitor as electrode。
It is an object of the invention to adopt following technical proposals to realize:
The present invention provides the adpting flange of a kind of equal potential shielded capacitor voltage transformer, described equal potential shielded capacitor voltage transformer includes equivalent potential screen capacitor unit, it thes improvement is that, described adpting flange is installed on the two ends of equivalent potential screen capacitor unit, and axially vertical with equivalent potential screen capacitor unit；
The described supports insulative low end face of son is lower than the low end face of adpting flange, to meet the storage requirement of single-unit equivalent potential screen capacitor unit and supports insulative and inner annular electrode thereof are played a protective role。
Further, described equivalent potential screen capacitor unit includes being arranged between upper and lower described adpting flange, main capacitor sequentially coaxially, interior insulant, annular electrode and insulating sleeve from inside to outside；Described main capacitor upper and lower side is equipped with supports insulative being connected with described adpting flange, and described supports insulative is positioned on the axle center of described insulating sleeve；
The top of described insulating sleeve is respectively equipped with the sleeve flange being connected with described adpting flange with bottom；It is arranged symmetrically with several auxiliary capacitors along insulating sleeve inwall circumference between upper and lower described annular electrode；Described auxiliary capacitor is connected with described annular electrode by stud and nut, and described stud extends through described auxiliary capacitor to the described adpting flange of its correspondence；Described stud is provided with spring。
Further, having certain distance between the described pivot flange that described stud end face is corresponding, described certain distance is at least above described auxiliary capacitor axial expansion amount。
Further, the bottom of described auxiliary capacitor is connected with described adpting flange by nut。
Further, described supports insulative attached bag draws together Mume flower contact assembly, the circular hole coaxial at described Mume flower contact assembly and adpting flange center to。
Further, described adpting flange center is provided with and the supports insulative homoaxial circular hole of son, and described supports insulative is inserted vertically in circular hole。
Further, the end face of described adpting flange is provided with O seal groove, with the O vertical with axial direction of the axial O of adpting flange and supports insulative with the use of, it is achieved the sealing of capacitor unit。
Further, the O vertical with axial direction of the axial O of described adpting flange and main capacitance supports insulative is with the use of, it is achieved the double-layer seal of node。
Further, the O vertical with axial direction of described supports insulative is positioned on the medial surface of supports insulative。
Further, described adpting flange is taken as capacitor unit internal shield electrode for capacitors, for single-unit equivalent potential screen capacitor unit, all presses for the annular electrode shielded in equivalent potential screen capacitor unit；It is used for connecting electrode for adjacent equivalent potential screen capacitor unit, electrically connects the screened condenser assembly in equivalent potential screen capacitor unit and (include being arranged between upper and lower described adpting flange, main capacitor sequentially coaxially, interior insulant, annular electrode and insulating sleeve from inside to outside；The top of described insulating sleeve is respectively equipped with the sleeve flange being connected with described adpting flange with bottom；It is provided with auxiliary capacitor) between described annular electrode upper and lower side and the adpting flange corresponding with its upper and lower side。
Compared with the prior art, the present invention reaches to provide the benefit that:
Adpting flange provided by the invention achieve to equal potential shielded capacitor voltage transformer CVT reasonable, safely, quickly, install。Installation process fully takes into account the planform of each parts of capacitance type potential transformer CVT, material properties, intensity, electric property, select rational installation steps, parts connected mode cleverly, and avoid using large complicated Work tool so that installment work is simpler and more direct, safety。Achieve screened condenser all press, be electrically connected, capacitor unit sealing, the aspect function such as storage。Meet the aspect requirements such as the design of transformer electric field, mechanical strength, antidetonation, front face area。This adpting flange integrates several functions, is maintained with simple in construction, with low cost。
Adpting flange provided by the invention successfully solves capacitor unit and assembles, deposit and seal a difficult problem, while meeting requirement of mechanical strength, achieves again the electrical connection of capacitor unit internal shield capacitor as electrode。
Accompanying drawing explanation
Fig. 1 is equal potential shielded capacitor voltage transformer structural representation；
The equivalent potential screen capacitor unit that Fig. 2 is B in Fig. 1 is connected with each other amplification axial section；
Fig. 3 is the adpting flange scheme of installation of equal potential shielded capacitor voltage transformer provided by the invention；Wherein: A-equal potential shielded capacitor voltage transformer, B-equivalent potential screen capacitor unit, 1-main capacitor, 2-insulating sleeve, 3-auxiliary capacitor, 4-annular electrode, 5-supports insulative, 6-adpting flange；7-sleeve flange。
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail。
The adpting flange of a kind of capacitor unit for equal potential shielded capacitor voltage transformer provided by the invention, also known as end seal flange。Described equal potential shielded capacitor voltage transformer includes equivalent potential screen capacitor unit, and described adpting flange is installed on the two ends of equivalent potential screen capacitor unit, and axially vertical with equivalent potential screen capacitor unit。
Equivalent potential screen capacitor unit includes being arranged between upper and lower described adpting flange, main capacitor sequentially coaxially, interior insulant, annular electrode and insulating sleeve from inside to outside；Described main capacitor upper and lower side is equipped with supports insulative being connected with described adpting flange, and described supports insulative is positioned on the axle center of described insulating sleeve；The top of described insulating sleeve is respectively equipped with the sleeve flange being connected with described adpting flange with bottom；It is provided with auxiliary capacitor between described annular electrode upper and lower side and the adpting flange corresponding with its upper and lower side。It is arranged symmetrically with several auxiliary capacitors along insulating sleeve inwall circumference between upper and lower described annular electrode；Described auxiliary capacitor is connected with described annular electrode by stud and nut, and described stud extends through described auxiliary capacitor to the described adpting flange of its correspondence；Described stud is provided with spring。Having certain distance between the described pivot flange that stud end face is corresponding, described certain distance is at least above described auxiliary capacitor axial expansion amount。The bottom of auxiliary capacitor is connected with described adpting flange by nut。
In equal potential shielded capacitor voltage transformer structural representation and Fig. 1, the equivalent potential screen capacitor unit of B is connected with each other amplification axial section respectively as illustrated in fig. 1 and 2。
The scheme of installation of adpting flange is as it is shown on figure 3, this adpting flange is installed on the two ends of the container unit that often economizes on electricity, and on its end face, design has O seal groove, is equipped with the O of dimension, it is achieved that the sealing of capacitor unit。Adpting flange center is provided with and the supports insulative homoaxial circular hole of son, and described supports insulative is inserted vertically in circular hole。The double-deck positive sealing of this place's node is realized by radial direction O (with the O on the axially vertical direction) Seal Design on end face axial O herein and medial surface。Rational structural design makes its installment work simple and safe。
After supports insulative installs with this adpting flange; guarantee that the supports insulative low end face of son is not over the low end face of adpting flange by reasonably design, thus ensure that the storage requirement of single-unit capacitor unit and supports insulative and internal electrode being played a protective role。
This adpting flange is taken as the electrode of capacitor unit internal shield capacitor simultaneously, and for single-unit capacitor unit, it serves all pressure effects for screened condenser electrode；For neighboring capacitors unit, it serves the effect connecting electrode, electrically connects the screened condenser assembly in each economize on electricity container unit and (includes being arranged between upper and lower described adpting flange, main capacitor sequentially coaxially, interior insulant, annular electrode and insulating sleeve from inside to outside；The top of described insulating sleeve is respectively equipped with the sleeve flange being connected with described adpting flange with bottom；It is provided with auxiliary capacitor) between described annular electrode upper and lower side and the adpting flange corresponding with its upper and lower side。
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; although the present invention being described in detail with reference to above-described embodiment; the specific embodiment of the present invention still can be modified or equivalent replacement by those of ordinary skill in the field; these are without departing from any amendment of spirit and scope of the invention or equivalent replace, within the claims of the present invention all awaited the reply in application。
Claims (10)
1. the adpting flange of an equal potential shielded capacitor voltage transformer, described equal potential shielded capacitor voltage transformer includes equivalent potential screen capacitor unit, it is characterized in that, described adpting flange is installed on the two ends of equivalent potential screen capacitor unit, and axially vertical with equivalent potential screen capacitor unit supports insulative；
The described supports insulative low end face of son is lower than the low end face of adpting flange, to meet the storage requirement of single-unit equivalent potential screen capacitor unit and supports insulative and inner annular electrode thereof are played a protective role。
2. adpting flange as claimed in claim 1, it is characterised in that described equivalent potential screen capacitor unit includes being arranged between upper and lower described adpting flange, main capacitor sequentially coaxially, interior insulant, annular electrode and insulating sleeve from inside to outside；Described main capacitor upper and lower side is equipped with supports insulative being connected with described adpting flange, and described supports insulative is positioned on the axle center of described insulating sleeve；
The top of described insulating sleeve is equipped with the sleeve flange being connected with described adpting flange with bottom；It is arranged symmetrically with several auxiliary capacitors along insulating sleeve inwall circumference between upper and lower described annular electrode；Described auxiliary capacitor is connected with described annular electrode by stud and nut, and described stud extends through described auxiliary capacitor to the described adpting flange of its correspondence；Described stud is provided with spring。
3. adpting flange as claimed in claim 2, it is characterised in that having certain distance between the described pivot flange that described stud end face is corresponding, described certain distance is at least above described auxiliary capacitor axial expansion amount。
4. adpting flange as claimed in claim 3, it is characterised in that the bottom of described auxiliary capacitor is connected with described adpting flange by nut。
5. adpting flange as claimed in claim 1 or 2, it is characterised in that described supports insulative attached bag draws together Mume flower contact assembly, the circular hole coaxial at described Mume flower contact assembly and adpting flange center to。
6. adpting flange as claimed in claim 1, it is characterised in that described adpting flange center is provided with and the supports insulative homoaxial circular hole of son, and described supports insulative is inserted vertically in circular hole。
7. adpting flange as claimed in claim 1, it is characterized in that, the end face of described adpting flange is provided with O seal groove, with the O vertical with axial direction of the axial O of adpting flange and supports insulative with the use of, it is achieved the sealing of capacitor unit。
8. adpting flange as claimed in claim 7, it is characterised in that the O vertical with axial direction of the axial O of described adpting flange and supports insulative is with the use of, it is achieved the double-layer seal of node。
9. adpting flange as claimed in claim 8, it is characterised in that the O vertical with axial direction of described supports insulative is positioned on the medial surface of supports insulative。
10. adpting flange as claimed in claim 1, it is characterized in that, described adpting flange is taken as capacitor unit internal shield electrode for capacitors, for single-unit equivalent potential screen capacitor unit, all presses for the annular electrode shielded in equivalent potential screen capacitor unit；It is used for connecting electrode for adjacent equivalent potential screen capacitor unit, electrically connects the screened condenser assembly in equivalent potential screen capacitor unit。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410682103.0A CN105699725A (en) | 2014-11-24 | 2014-11-24 | Connecting flange of equipotential shielded capacitive voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410682103.0A CN105699725A (en) | 2014-11-24 | 2014-11-24 | Connecting flange of equipotential shielded capacitive voltage transformer |
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| Publication Number | Publication Date |
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| CN105699725A true CN105699725A (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410682103.0A Pending CN105699725A (en) | 2014-11-24 | 2014-11-24 | Connecting flange of equipotential shielded capacitive voltage transformer |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2919481Y (en) * | 2006-06-15 | 2007-07-04 | 武汉高压研究所 | 765kV electromagnetic standard voltage mutual inductor with single stage structure |
| CN201282024Y (en) * | 2008-08-12 | 2009-07-29 | 中国西电电气股份有限公司 | Oil immersion inversion type current transformer |
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
| CN201886877U (en) * | 2010-12-14 | 2011-06-29 | 何平 | Enhanced dual-sealing-structure transformer sleeve pipe |
| CN203084045U (en) * | 2013-01-15 | 2013-07-24 | 安徽继远电网技术有限责任公司 | Extra-high-voltage capacitor voltage divider provided with shielding capacitor |
| CN103713175A (en) * | 2013-12-24 | 2014-04-09 | 北京航天时代光电科技有限公司 | Combined optical transformer for novel GIS |
| CN104681261A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential mask capacitor type voltage transformer |
| CN104678155A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential shielding capacitor type voltage transformer |
| CN104678148A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential shielding capacitor type voltage transformer |
-
2014
- 2014-11-24 CN CN201410682103.0A patent/CN105699725A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2919481Y (en) * | 2006-06-15 | 2007-07-04 | 武汉高压研究所 | 765kV electromagnetic standard voltage mutual inductor with single stage structure |
| CN201282024Y (en) * | 2008-08-12 | 2009-07-29 | 中国西电电气股份有限公司 | Oil immersion inversion type current transformer |
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
| CN201886877U (en) * | 2010-12-14 | 2011-06-29 | 何平 | Enhanced dual-sealing-structure transformer sleeve pipe |
| CN203084045U (en) * | 2013-01-15 | 2013-07-24 | 安徽继远电网技术有限责任公司 | Extra-high-voltage capacitor voltage divider provided with shielding capacitor |
| CN104681261A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential mask capacitor type voltage transformer |
| CN104678155A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential shielding capacitor type voltage transformer |
| CN104678148A (en) * | 2013-11-26 | 2015-06-03 | 国家电网公司 | Equipotential shielding capacitor type voltage transformer |
| CN103713175A (en) * | 2013-12-24 | 2014-04-09 | 北京航天时代光电科技有限公司 | Combined optical transformer for novel GIS |
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Effective date of registration: 20170602 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China-EPRI Electric Power Engineering Co., Ltd. Applicant after: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Smart Grid Institute Applicant before: China-EPRI Electric Power Engineering Co., Ltd. Applicant before: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd. |
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