CN104316740A - Coupling capacitance voltage divider with shielding capacitor core - Google Patents
Coupling capacitance voltage divider with shielding capacitor core Download PDFInfo
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- CN104316740A CN104316740A CN201410647877.XA CN201410647877A CN104316740A CN 104316740 A CN104316740 A CN 104316740A CN 201410647877 A CN201410647877 A CN 201410647877A CN 104316740 A CN104316740 A CN 104316740A
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- mask capacitor
- voltage divider
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Abstract
The invention provides a coupling capacitance voltage divider with a shielding capacitor core. The voltage divider comprises a sleeve, an umbrella skirt arranged on the outer wall of the sleeve in a wrapping mode, a primary wiring board and a base, wherein the primary wiring board and the base are installed at the two ends of the sleeve respectively, the umbrella skirt is made of silicone rubber, the sleeve is made of epoxy glass yarn, and the shielding capacitor core and a main capacitor core arranged in the shielding capacitor core are coaxially installed in the sleeve. According to the voltage divider, on the basis that the total capacitance of the coupling capacitance voltage divider is reduced, the stability of the voltage division ratio of the voltage divider is guaranteed, and the comprehensive performance of an EVT is effectively improved.
Description
Technical field
The present invention relates to a kind of voltage divider, specifically relate to a kind of coupling capacitance voltage divider with mask capacitor fuse.
Background technology
Electronic type voltage transformer (Electronic Voltage Transformer, EVT) pass through from voltage divider low-pressure side extracting directly secondary voltage signal, avoid ferroresonance problem and magnetic saturation problem, while improve the dynamic response capability of conventional voltage mutual inductor, achieve the digitizing of voltage divider low-pressure side voltage, these advantages have become the Main way of current mutual inductor development.
Current 110kV to 750kV electric pressure independent support type EVT adopts coupling capacitance voltage divider arrangement substantially, in order to reduce fringing field and proximity effect affects the accuracy of capacitive divider intrinsic standoff ratio, usually the electric capacity of capacitive divider is increased to thousands of about pF; So large electric capacity, causes the weight of voltage divider, volume and cost to increase on the one hand; On the other hand, when there is transient state process in high-voltage fence, the transferring over-voltage amplitude being coupled to electrical secondary system can be made high, and then cause electrical secondary system to occur mess code, deadlock or hardware damage, thus threaten the safety of the electrical secondary system be connected with EVT voltage divider low-pressure side, reduce the reliability of EVT overall operation.
In sum, the electric capacity reducing coupling capacitance voltage divider, to reduction voltage divider weight, volume, improves voltage divider, electrical secondary system functional reliability is significant.The invention provides a kind of coupling capacitance voltage divider with mask capacitor fuse, its electric capacity main body is made up of jointly mask capacitor fuse and main capacitance fuse, on the basis reducing coupling capacitance voltage divider total capacitance, ensure that the stability of voltage divider ratio, effectively improve the combination property of EVT.
Summary of the invention
In order to overcome above-mentioned deficiency existing in prior art, the invention provides a kind of coupling capacitance voltage divider with mask capacitor fuse, mask capacitor fuse and main capacitance fuse form the main body of capacitive divider jointly; On the basis reducing coupling capacitance voltage divider total capacitance, the intrinsic standoff ratio of voltage divider main capacitance can be made not by ectocine, improve the precision of capacitive divider.
Technical scheme provided by the invention is: a kind of coupling capacitance voltage divider with mask capacitor fuse, described voltage divider comprises sleeve, is wrapped in the full skirt of described sleeve outer wall and is arranged on primary connection plate and the base at described sleeve two ends respectively, described full skirt silicon rubber is made, and described sleeve epoxy fibreglass is made; It is characterized in that: be coaxially installed with mask capacitor fuse in described sleeve and be arranged on the main capacitance fuse in described mask capacitor fuse.
Preferably, described main capacitance fuse is cuboid winding capacitance; Described mask capacitor fuse is the electric capacity of the rectangular frame structure formed after hollow out in the middle part of rectangle winding capacitance.
Further, the hollow out face forming openwork part in the middle part of described mask capacitor fuse is four smooth end faces; Described mask capacitor is through energizing the thin spot rejecting described hollow out face medium.
Further, the openwork part in the middle part of described mask capacitor fuse is the rectangle of shape and size similar to described main capacitance fuse shape slightly larger than described main capacitance fuse.
Further, the thickness of described main capacitance fuse equals the thickness of described mask capacitor fuse.
Further, the metal metallized safety film that described rectangle winding capacitance has a self-healing function by two-layer and the polypropylene film be stacked alternately successively between described double-layer metallization safety diaphragm and electric capacity paper through winding, flatten after make through high vacuum dip treating, the two ends of described rectangle winding capacitance are wound around along the direction parallel with described coiling direction and are enclosed with metal connecting sheet.
Further, described main capacitance fuse is arranged in described mask capacitor fuse by the engraved structure of described mask capacitor fuse, in the same plane with described mask capacitor fuse, the metal connecting sheet of described main capacitance fuse is parallel with the metal connecting sheet of described mask capacitor fuse.
Further, the capacity of described main capacitance fuse is suitable with the amount of capacity of described mask capacitor fuse; Described main capacitance fuse is fixed along sleeve axis direction in identical series and parallel connections mode with described mask capacitor fuse, closed assembly is placed in described sleeve inner.
Preferably, described sleeve two ends are respectively arranged with flange, and described sleeve two ends are fixed respectively by described flange and described primary connection plate and described base.
Further, above described primary connection plate, be provided with the high-pressure side shading ring coaxial with described sleeve, above described base, be provided with the low pressure end shading ring coaxial with described sleeve; Described high-pressure side shading ring and described low pressure end shading ring are grading ring.
Further, between the flange of described sleeve bottom end and described base, be provided with O-ring seal, be provided with O-ring seal between the flange on described sleeve top and described primary connection plate, in the seal chamber of described sleeve, be filled with megohmite insulant.
Further, described megohmite insulant is oiliness megohmite insulant or gas-insulated material.
Compared with immediate technical scheme, the present invention has following marked improvement:
1) coupling capacitance voltage divider capacitance provided by the invention reduces greatly, reduces the volume of capacitor type electronic mutual inductor, alleviates the weight of voltage divider, reduces manufacturing cost;
2) at coupling capacitance voltage divider inner additional one deck shielding fuse, this screen layer can eliminate the impact of high-pressure side stray capacitance, not only improve the distribution of voltage divider internal electric field, improve the electric property of voltage divider, also make the output of voltage divider accuracy of measurement and secondary side;
3) multi-layer polypropylene film and electric capacity paper is provided with between the double-layer metallization safety diaphragm of the mask capacitor fuse of coupling capacitance voltage divider provided by the invention, increase the distance between metal electrode, improve the insulating property of mask capacitor fuse internal end surface after hollow out;
4) coupling capacitance voltage divider mask capacitor fuse provided by the invention adopts a kind of new technique to make, and namely rolling hollow out in the middle part of electric capacity, be made into rectangular parallelepiped framed structure, this structure effectively can ensure the homogeneity that internal electric field distributes.
5) main capacitance fuse is be arranged on the rectangle structure in mask capacitor fuse, mask capacitor fuse is equal or relative fixing with main capacitance phase co-altitude current potential, there is good shield effectiveness, thus ensure that the stability of intrinsic standoff ratio on the basis of total capacitance reducing coupling capacitance voltage divider.
6) coupling capacitance voltage divider provided by the invention not only may be used for EVT, can also be used for the runnability improving CVT.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the coupling capacitance voltage divider of band mask capacitor fuse provided by the invention;
Fig. 2 is the structural representation of main capacitance fuse;
Fig. 3 is metal metallized safety film for making winding capacitance and the cross-sectional structure schematic diagram of medium therebetween;
Fig. 4 is the structural representation of mask capacitor fuse;
Fig. 5 is the main capacitance fuse of coupling capacitance voltage divider inside and the scheme of installation of mask capacitor fuse;
Fig. 6 is the main capacitance fuse of coupling capacitance voltage divider inside and the installation sectional view of mask capacitor fuse;
Fig. 7 is the fundamental diagram of the coupling capacitance voltage divider of band mask capacitor fuse;
Wherein 1-high-pressure side shading ring; 2-primary connection plate; 3-upper flange; 4-full skirt; 5-lower flange; 6-sleeve; 7-main capacitance fuse; 8-mask capacitor fuse; 9-low pressure end shading ring; 10-base; 11-metal metallized safety film; 12-film; 13-electric capacity paper; 14-metal connecting sheet.
Embodiment
In order to understand the present invention better, below in conjunction with Figure of description and example, content of the present invention is described further.
As shown in Figure 1, the present invention is a kind of coupling capacitance voltage divider with mask capacitor fuse-8, and described voltage divider comprises main capacitance fuse-7, mask capacitor fuse-8, high-pressure side shading ring-1, primary connection plate-2, upper flange-3, full skirt-4, sleeve-6, low pressure end shading ring-9, base-10, lower flange-5;
Sleeve-6 outer wrapping full skirt-4, full skirt-4 silicon rubber is made, and sleeve-6 adopts epoxy fibreglass to make, and full skirt-4 and sleeve-6 form the main body of voltage divider exterior insulation, its insulation and supporting role;
The low side of sleeve-6 is fixed on base-10 by lower flange-5, and rubber seal is provided with between lower flange-5 and base-10, to ensure that sleeve-6 and extraneous gas insulate, arrange its top to be fixed by upper flange-3 and primary connection plate-2, and between upper flange-3 and primary connection plate-2, be provided with rubber seal, to ensure that sleeve-6 and extraneous gas insulate; Be filled with insulating medium in the seal chamber of sleeve-6, described insulating medium is oiliness insulating medium or gas-insulated medium.
The top of primary connection plate-2 is provided with the high-pressure side shading ring-1 coaxial with sleeve-6, is provided with the low pressure end shading ring-9 coaxial with sleeve-6 above base-10; High-pressure side shading ring-1 and low pressure end shading ring-9 are grading ring, for improving the Electric Field Distribution on voltage divider surface.
Coaxial installation main capacitance fuse-7 and mask capacitor fuse-8 in the seal chamber of sleeve-6; As shown in Figure 2: main capacitance fuse-7 is rectangular winding capacitance, and at the two ends of winding capacitance along the direction coated metal brace-14 parallel with coiling direction; As shown in Figure 3: winding capacitance is passed through winding by the metal metallized safety film-11 with self-healing function with the multi-layer polypropylene film-12 be alternately placed on therebetween and electric capacity paper-13, flattens and make through high vacuum dip treating.
As shown in Figure 4: the rectangular frame structure that mask capacitor fuse-8 is made up of hollow out in the middle part of rectangle winding capacitance, mask capacitor fuse-8 four inner faces flushed form middle part openwork part, and through the thin spot rejecting internal end surface medium of energizing; Add multilayer film-12 and electric capacity paper-13 between the double-layer metallization safety diaphragm-11 of mask capacitor fuse-8 and increase distance between metal electrode, thus the insulating property of mask capacitor fuse-8 internal end surface after improve hollow out.Mask capacitor fuse-8 does not change the characteristic of winding capacitance, and fuse internal electric field is evenly distributed; Mask capacitor fuse-8 is identical with the material of the employing of main capacitance fuse-7, and windings is identical.
As shown in Figure 5 and Figure 6: main capacitance fuse-7 is wound into identical thickness with mask capacitor fuse-8, main capacitance fuse-7 is placed on the inside of mask capacitor fuse-8, connected by sheet metal respectively between main capacitance fuse-7 and between mask capacitor fuse-8, main capacitance fuse-7 and mask capacitor fuse-8 are with the inside that identical connected mode is fixed, closed assembly is placed in voltage divider.Main capacitance fuse-7 is suitable with the amount of capacity of mask capacitor fuse-8, and total capacitance can be down to hundreds of pF.Main capacitance is equal or relatively stable at phase co-altitude current potential with mask capacitor, what first extraneous interference had influence on is mask capacitor, mask capacitor serves and weakens the impact of external electrical field change on main capacitance, thus ensure that the stability of voltage divider ratio, its principle of work is as shown in Figure 7: in Fig. 3, C
1, C
2for the main capacitance be made up of main capacitance fuse-7 is used for measuring voltage; C
screenfor by the molecular mask capacitor of the sub-core of mask capacitor; C
h, C
gbe respectively high-pressure side to the stray capacitance of voltage divider and voltage divider stray capacitance over the ground.
These are only embodiments of the invention, be not limited to the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all applying within the right of the present invention awaited the reply.
Claims (12)
1. the coupling capacitance voltage divider with mask capacitor fuse, described voltage divider comprises sleeve, is wrapped in the full skirt of described sleeve outer wall and is arranged on primary connection plate and the base at described sleeve two ends respectively, described full skirt silicon rubber is made, and described sleeve epoxy fibreglass is made; It is characterized in that: be coaxially installed with mask capacitor fuse in described sleeve and be arranged on the main capacitance fuse in described mask capacitor fuse.
2. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 1, is characterized in that: described main capacitance fuse is cuboid winding capacitance; Described mask capacitor fuse is the electric capacity of the rectangular frame structure formed after hollow out in the middle part of rectangle winding capacitance.
3. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 2, is characterized in that: the hollow out face forming openwork part in the middle part of described mask capacitor fuse is four smooth end faces; Described mask capacitor is through energizing the thin spot rejecting described hollow out face medium.
4. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 3, is characterized in that:
Openwork part in the middle part of described mask capacitor fuse is the rectangle of shape and size similar to described main capacitance fuse shape slightly larger than described main capacitance fuse.
5. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 4, is characterized in that:
The thickness of described main capacitance fuse equals the thickness of described mask capacitor fuse.
6. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 2, is characterized in that:
The metal metallized safety film that described rectangle winding capacitance has a self-healing function by two-layer and the polypropylene film be stacked alternately successively between described double-layer metallization safety diaphragm and electric capacity paper through winding, flatten after make through high vacuum dip treating, the two ends of described rectangle winding capacitance are wound around along the direction parallel with described coiling direction and are enclosed with metal connecting sheet.
7. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 4, is characterized in that:
Described main capacitance fuse is arranged in described mask capacitor fuse by the engraved structure of described mask capacitor fuse, in the same plane with described mask capacitor fuse, the metal connecting sheet of described main capacitance fuse is parallel with the metal connecting sheet of described mask capacitor fuse.
8. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 7, is characterized in that:
The capacity of described main capacitance fuse is suitable with the amount of capacity of described mask capacitor fuse; Described main capacitance fuse is fixed along sleeve axis direction in identical series and parallel connections mode with described mask capacitor fuse, closed assembly is placed in described sleeve inner.
9. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 1, is characterized in that: described sleeve two ends are respectively arranged with flange, and described sleeve two ends are fixed respectively by described flange and described primary connection plate and described base.
10. a kind of coupling capacitance voltage divider with mask capacitor fuse as claimed in claim 9, it is characterized in that: above described primary connection plate, be provided with the high-pressure side shading ring coaxial with described sleeve, above described base, be provided with the low pressure end shading ring coaxial with described sleeve; Described high-pressure side shading ring and described low pressure end shading ring are grading ring.
11. a kind of coupling capacitance voltage dividers with mask capacitor fuse as claimed in claim 9, it is characterized in that: between the flange of described sleeve bottom end and described base, be provided with O-ring seal, be provided with O-ring seal between the flange on described sleeve top and described primary connection plate, in the seal chamber of described sleeve, be filled with megohmite insulant.
12. a kind of coupling capacitance voltage dividers with mask capacitor fuse as claimed in claim 11, is characterized in that: described megohmite insulant is oiliness megohmite insulant or gas-insulated material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410647877.XA CN104316740B (en) | 2014-11-14 | 2014-11-14 | A kind of coupled capacitor divider with mask capacitor fuse |
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| CN201410647877.XA CN104316740B (en) | 2014-11-14 | 2014-11-14 | A kind of coupled capacitor divider with mask capacitor fuse |
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| CN104316740A true CN104316740A (en) | 2015-01-28 |
| CN104316740B CN104316740B (en) | 2018-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199120A (en) * | 2016-06-22 | 2016-12-07 | 西北核技术研究所 | Interpolation type thin-film capacitor voltage divider |
| CN109116079A (en) * | 2018-10-24 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of inscribed touch type capacitor divider for GIS |
| CN113358962A (en) * | 2021-06-15 | 2021-09-07 | 合肥航太电物理技术有限公司 | Experimental device for compact impulse voltage generator and voltage divider |
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| WO2012141609A1 (en) * | 2011-04-11 | 2012-10-18 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | Capacitive voltage divider for hermetically sealed unitized distribution devices |
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| CN204228794U (en) * | 2014-11-14 | 2015-03-25 | 国家电网公司 | A kind of coupling capacitance voltage divider with mask capacitor fuse |
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2014
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199120A (en) * | 2016-06-22 | 2016-12-07 | 西北核技术研究所 | Interpolation type thin-film capacitor voltage divider |
| CN106199120B (en) * | 2016-06-22 | 2018-10-26 | 西北核技术研究所 | Interpolation type thin-film capacitor voltage divider |
| CN109116079A (en) * | 2018-10-24 | 2019-01-01 | 云南电网有限责任公司电力科学研究院 | A kind of inscribed touch type capacitor divider for GIS |
| CN109116079B (en) * | 2018-10-24 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Internal contact type capacitive voltage divider for GIS |
| CN113358962A (en) * | 2021-06-15 | 2021-09-07 | 合肥航太电物理技术有限公司 | Experimental device for compact impulse voltage generator and voltage divider |
| CN113358962B (en) * | 2021-06-15 | 2022-03-22 | 合肥航太电物理技术有限公司 | Experimental device for compact impulse voltage generator and voltage divider |
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| CN104316740B (en) | 2018-08-14 |
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