EP1103988B1 - SEmi-capacitance graded bushing insulator of the type with insulating gas filling, such as SF6 - Google Patents
SEmi-capacitance graded bushing insulator of the type with insulating gas filling, such as SF6 Download PDFInfo
- Publication number
- EP1103988B1 EP1103988B1 EP00107732A EP00107732A EP1103988B1 EP 1103988 B1 EP1103988 B1 EP 1103988B1 EP 00107732 A EP00107732 A EP 00107732A EP 00107732 A EP00107732 A EP 00107732A EP 1103988 B1 EP1103988 B1 EP 1103988B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitance
- insulating
- semi
- graded bushing
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012212 insulator Substances 0.000 title description 8
- 239000004020 conductor Substances 0.000 claims description 16
- 239000011888 foil Substances 0.000 claims description 9
- 229910052573 porcelain Inorganic materials 0.000 claims description 8
- 230000005684 electric field Effects 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 9
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 6
- 238000010292 electrical insulation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/26—Lead-in insulators; Lead-through insulators
- H01B17/28—Capacitor type
Definitions
- the present invention concerns a semi-capacitance graded bushing insulator of the type with insulating filling of a gas, such as for example sulphur hexafluoride (SF 6 ).
- a gas such as for example sulphur hexafluoride (SF 6 ).
- the present invention aims to provide a semi-capacitance graded bushing insulator which permits the exposure in air of a high-tension conductor capable of carrying current in the connection between an aerial line and an electrical apparatus such as for example a switch, a gas insulated system (GIS), a gas insulated line (GIL) and similar, containing gas under pressure.
- an electrical apparatus such as for example a switch, a gas insulated system (GIS), a gas insulated line (GIL) and similar, containing gas under pressure.
- GIS gas insulated system
- GIL gas insulated line
- US 3,467,938 discloses condenser bushings of the type provided by winding layers of electrical insulation, and a method for attaching electrical conductors to the conducting condenser elements and leading the conductors to the outside of the insulation without subsequently cutting the insulation.
- a condenser bushing comprising layers of insulation material is wound around a central conductor.
- Conductive condenser elements or foils are placed between layers of the insulation at properly determined radially spaced intervals throughout the buildup of layers of electrical insulating material.
- a conductor is attached to the conductor foils or condenser elements when they are placed in position between the layers of electrical insulation.
- the conductor is wound between the layers of insulation and played along with the insulation at a slight displacement of each turn of the conductor and fed out beyond the last turn of the electrical insulation where the conductor may be connected to an appropriate terminal. While this prior art system solves the problem of bringing connection to the outside of the insulation where it may be connected to a proper terminal, in this system the coil is wounded on a lathe, a fact that may create possible defects, such as undesired ovalization defects in the roundness of the lathe made coil.
- the main object of the present invention is that of reducing to the maximum extent the cost of the apparatus for voltages equal to or greater than 220 kV.
- the insulating space between the central conductor and the flange is divided into two parts.
- the first part is formed by the insulating gas and the second part, nearer the flange, is formed by an insulating capacitance body of reduced dimensions having (i) an insulation of plastics material, usually polypropylene, impregnated with SF 6 , or (ii) an insulation of resin-impregnated paper.
- the dimensions of the insulation while being limited by the width of the insulating sheet, permit good distribution of the electrical field around the flange and along a good part of the external insulator. Distribution of the electric field relative to the upper part is ensured by the prolongation of the tube on which the insulating capacitance body is wound and which operates as a distribution electrode. That distribution electrode and the upper electrode, at the potential of the head 3 and the upper plate 2, permit good longitudinal distribution also in the upper zone of the porcelain and in the contiguous region of the head of the graded bushing.
- the electric field including the radial field, is distributed uniformly by taking account of the capacitance of the two insulating means calculated with the respective dielectric constants.
- the gradients are contained in the limits permitted by the two types of dielectric.
- the other great advantage is that the gas which surrounds the conductor also acts as a carrier for transfer of the heat produced by the current flowing in the conductor.
- the bushing is formed by a conductor 1 fixed to a plate 2, in the upper part, and in the lower part it is fixed by way of a movable contact 4 to the fixed electrode 5 of the gas insulated bus-duct 6.
- the bushing also includes an insulating capacitance body 7 formed by a winding of insulating material, in general plastics film or resin-impregnated paper, into which conductive or semi-conductive foils 8 are inserted as armatures, wound on a tube 9 which is prolonged with respect to the insulating body in such a way as to operate as an electrode which is suitably screened with end rings 10.
- the insulating capacitance body 7 is supported within a flange 11 which is fixed with respect to the external porcelain 12 by way of a cemented collar 13, and is fixed to an insulating tube 14 of glass fibre-reinforced resin disposed in the interior of the porcelain 12 to forestall the thermal shock caused by a possible internal short-circuit.
- the assembly is filled with insulating gas under pressure, generally SF 6 .
- the capacitance comprising the conductor 1 and the electrode 6 as plates or foils, and the gas as dielectric, is disposed in cascade relationship with the capacitance of the insulating capacitance body and thus stabilises distribution of the voltage which is suitably calculated taking into account the respective dielectric constants.
- an electrode 15 is connected to the plate 2 and thus to the full voltage.
- a capacitance tap 18 which, besides checking the capacitance and the tg ⁇ of the bushing, can with suitable capacitive matching be used as a tap for measuring the voltage and/or for actuation of members for protecting the high-tension line.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Insulating Bodies (AREA)
Description
- The present invention concerns a semi-capacitance graded bushing insulator of the type with insulating filling of a gas, such as for example sulphur hexafluoride (SF6).
- The present invention aims to provide a semi-capacitance graded bushing insulator which permits the exposure in air of a high-tension conductor capable of carrying current in the connection between an aerial line and an electrical apparatus such as for example a switch, a gas insulated system (GIS), a gas insulated line (GIL) and similar, containing gas under pressure.
- The current state of the art involves three systems for affording a graded bushing insulator of the type indicated, namely:
- 1 - A graded bushing insulator filled with gas, generally SF6, with a fixed electrode or electrodes for improved distribution of the radial and longitudinal electrical gradient (Figure 1). This system is normally used for voltages which are not very high, that is to say up to 220 kV, and is certainly the most economical but it does not permit ideal distribution of the electrical field both in the radial direction and the longitudinal direction. When there is a wish to use it for voltages of higher than 220 kV the dimensions, both in terms of length and diameter, become very large and, bearing in mind also the mechanical stresses which derive therefrom, the costs involved are very high.
- 2 - Insulator having an insulating capacitance body of the resin impregnated paper type Figure 2). In this case distribution of the electric field is much better since it is ensured by a discrete number of plates or foils which are inserted during winding of the insulating body. While being of smaller dimensions, they do not exploit the highly insulating properties of sulphur hexafluoride but do use the technology normally employed in the various types of graded bushings used in conjunction with apparatuses filled with oil or in a wall bushing.The disadvantage of that system lies in the high level of cost and the excessive weight of the assembly.
- 3 - Capacitance graded bushing gas impregnated plastics film type insulator (Figure 2).
-
- In this case also, the same advantages and disadvantages as described hereinbefore are involved. Having regard to the limited dimensions of the reels of plastics film, the operation of winding the insulating body has to be implemented, not continuously with a single sheet of film but by means of ribbons, with a system similar to that used in cables. A negative aspect is also linked to the greater degree of difficulty of introducing the foils or plates and longitudinal impregnation of the gas in insulating bodies of dimensions involving some metres in length.
- Moreover, US 3,467,938 discloses condenser bushings of the type provided by winding layers of electrical insulation, and a method for attaching electrical conductors to the conducting condenser elements and leading the conductors to the outside of the insulation without subsequently cutting the insulation. In this prior art system, a condenser bushing comprising layers of insulation material is wound around a central conductor. Conductive condenser elements or foils are placed between layers of the insulation at properly determined radially spaced intervals throughout the buildup of layers of electrical insulating material. A conductor is attached to the conductor foils or condenser elements when they are placed in position between the layers of electrical insulation. The conductor is wound between the layers of insulation and played along with the insulation at a slight displacement of each turn of the conductor and fed out beyond the last turn of the electrical insulation where the conductor may be connected to an appropriate terminal. While this prior art system solves the problem of bringing connection to the outside of the insulation where it may be connected to a proper terminal, in this system the coil is wounded on a lathe, a fact that may create possible defects, such as undesired ovalization defects in the roundness of the lathe made coil.
- The main object of the present invention is that of reducing to the maximum extent the cost of the apparatus for voltages equal to or greater than 220 kV.
- The insulating space between the central conductor and the flange is divided into two parts. The first part is formed by the insulating gas and the second part, nearer the flange, is formed by an insulating capacitance body of reduced dimensions having (i) an insulation of plastics material, usually polypropylene, impregnated with SF6, or (ii) an insulation of resin-impregnated paper. The dimensions of the insulation, while being limited by the width of the insulating sheet, permit good distribution of the electrical field around the flange and along a good part of the external insulator. Distribution of the electric field relative to the upper part is ensured by the prolongation of the tube on which the insulating capacitance body is wound and which operates as a distribution electrode. That distribution electrode and the upper electrode, at the potential of the
head 3 and the upper plate 2, permit good longitudinal distribution also in the upper zone of the porcelain and in the contiguous region of the head of the graded bushing. - The electric field, including the radial field, is distributed uniformly by taking account of the capacitance of the two insulating means calculated with the respective dielectric constants. The gradients are contained in the limits permitted by the two types of dielectric.
- The advantages of that system lie in the use of an insulating capacitance body, of reduced dimensions and weight, which can be wound continuously with the advantage of easier insertion of the plates or foils and with the option, in the case of plastics film, of impregnation which is facilitated by the reduced longitudinal dimensions.
- The other great advantage is that the gas which surrounds the conductor also acts as a carrier for transfer of the heat produced by the current flowing in the conductor.
- Those advantages manifest themselves in a substantial cost reduction.
- The semi-capacitance graded bushing according to the present invention is described hereinafter with reference to two embodiments which are illustrated in Figure 3.
- As illustrated in Figure 3 the bushing is formed by a conductor 1 fixed to a plate 2, in the upper part, and in the lower part it is fixed by way of a
movable contact 4 to the fixed electrode 5 of the gas insulated bus-duct 6. The bushing also includes aninsulating capacitance body 7 formed by a winding of insulating material, in general plastics film or resin-impregnated paper, into which conductive or semi-conductive foils 8 are inserted as armatures, wound on a tube 9 which is prolonged with respect to the insulating body in such a way as to operate as an electrode which is suitably screened withend rings 10. The insulatingcapacitance body 7 is supported within aflange 11 which is fixed with respect to theexternal porcelain 12 by way of a cementedcollar 13, and is fixed to an insulatingtube 14 of glass fibre-reinforced resin disposed in the interior of theporcelain 12 to forestall the thermal shock caused by a possible internal short-circuit. The assembly is filled with insulating gas under pressure, generally SF6. The capacitance, comprising the conductor 1 and theelectrode 6 as plates or foils, and the gas as dielectric, is disposed in cascade relationship with the capacitance of the insulating capacitance body and thus stabilises distribution of the voltage which is suitably calculated taking into account the respective dielectric constants. - In order further to improve distribution of the electrical field in the zone around the
terminal electrode 16, anelectrode 15 is connected to the plate 2 and thus to the full voltage. - In addition there can be provided further
intermediate electrodes 17, shown in broken lines in Figure 3, which are used in particular for very high voltages, that is to say higher than 550 kV. - As a further alternative, instead of the
external porcelain 12 it would be possible to use a cylindrical insulating container which may or may not be equipped with fins of a polymer material such as silicone, EPDM and others. - In both the embodiments there is also provided a
capacitance tap 18 which, besides checking the capacitance and the tgδ of the bushing, can with suitable capacitive matching be used as a tap for measuring the voltage and/or for actuation of members for protecting the high-tension line.
Claims (6)
- A semi-capacitance graded bushing comprising:-a conductor (1) fixed, in the upper part, to a plate (2) of the head (3) and, in the lower part, by way of a movable contact (4) to the fixed electrode (5) of the gas insulated bus-duct (6);an external porcelain housing (12);an insulating capacitance body (7) formed by a winding of insulating material, generally plastics film or resin-impregnated paper, into which are inserted the conductive or semi-conductive foils as armatures (8);
a glass fibre-reinforced resin tube (14) disposed in the interior of the porcelain (12), in that the assembly is filled with insulating gas under pressure, generally SF6, and in that the capacitance having the conductor (1) and the electrode (9) as foils and the gas as dielectric, is in cascade relationship with the capacitance of the insulating capacitance body (7) and thus stabilises distribution of the voltage which is suitably calculated taking into account also the respective dielectric constants. - A semi-capacitance graded bushing according to claim 1 characterised in that an electrode (15) for distribution of the electrical field in the zone around the terminal electrode (16) is connected to the plate (2) and thus to the full voltage.
- A semi-capacitance graded bushing according to claim 2 characterised in that there is provided inside filed with response of March 25, 2005 the tube at least one further intermediate electrode (17) which is used in particular for very high voltages, that is to say voltages higher than 550 kV.
- A semi-capacitance graded bushing according to any one of claims 1 to 3 characterised in that there is provided a capacitance tap (18) which, besides controlling the capacitance and the tgδ of the graded bushing, can with suitable capacitive matching be used as a tap for measuring voltage and/or for actuation of members for protection for the high-tension line.
- A semi-capacitance graded bushing according to any one of claims 1 to 4 characterised in that the insulating capacitance body (7) is wound on the tube (9) and fixed to the glass fibre-reinforced resin tube (14), the outer armature (8) being optionally connected to the flange (11).
- A semi-capacitance graded bushing according to any one of the preceding claims characterised in that, instead of the external porcelain (12), there is used a cylindrical insulating container which may or may not be equipped with fins of a polymer material such as silicone, EPDM or others.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI992481 | 1999-11-26 | ||
IT1999MI002481A IT1313854B1 (en) | 1999-11-26 | 1999-11-26 | SEMI-CONDENSER THROUGH ISOLATOR OF THE GAS-INSULATING FILLING TYPE, SUCH AS SF6. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1103988A2 EP1103988A2 (en) | 2001-05-30 |
EP1103988A3 EP1103988A3 (en) | 2002-01-02 |
EP1103988B1 true EP1103988B1 (en) | 2005-11-30 |
Family
ID=11384037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00107732A Expired - Lifetime EP1103988B1 (en) | 1999-11-26 | 2000-04-11 | SEmi-capacitance graded bushing insulator of the type with insulating gas filling, such as SF6 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1103988B1 (en) |
DE (1) | DE60024399T2 (en) |
IT (1) | IT1313854B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101506911B (en) * | 2006-08-31 | 2011-04-06 | Abb技术有限公司 | High voltage bushing |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL206279B1 (en) * | 2004-06-29 | 2010-07-30 | Abb Spółka Z Ograniczoną Odpowiedzialnościąabb Spółka Z Ograniczoną Odpowiedzialnością | Capacitive insulating body of a high voltage culvert |
EP1624311A1 (en) * | 2004-08-06 | 2006-02-08 | Passoni & Villa Fabbrica Isolatori e Condensatori S.p.A. | Combined current and voltage measurement transformer of the capacitor bushing type |
CN100505120C (en) * | 2004-11-01 | 2009-06-24 | 王如璋 | Dry type mutual inductor with optical signal output |
CN101572140B (en) * | 2009-05-27 | 2011-08-17 | 江苏省电力公司无锡供电公司 | Ground wire grounded insulator structure |
EP3103124B1 (en) | 2014-02-05 | 2017-11-15 | ABB Schweiz AG | Condenser core |
CN109559861A (en) * | 2018-11-23 | 2019-04-02 | 国网江苏省电力有限公司经济技术研究院 | A kind of dry type high-voltage capacitor core |
CN112038015B (en) * | 2020-09-01 | 2022-06-03 | 沈阳工业大学 | Design method of wall bushing of capacitive high-temperature solid electric heat storage device |
EP3989242A1 (en) * | 2020-10-23 | 2022-04-27 | Hitachi Energy Switzerland AG | Flange for an electrical bushing and electrical bushing |
CN112530645B (en) * | 2020-12-19 | 2022-02-18 | 醴陵华鑫电瓷科技股份有限公司 | Hollow composite insulator |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3647938A (en) * | 1971-03-24 | 1972-03-07 | Westinghouse Electric Corp | Condenser bushing with flexible conductor connections attached to the condenser elements |
JPH0727739B2 (en) * | 1990-11-30 | 1995-03-29 | 日本碍子株式会社 | Explosion-proof porcelain tube for gas-filled insulation equipment and its manufacturing method |
-
1999
- 1999-11-26 IT IT1999MI002481A patent/IT1313854B1/en active
-
2000
- 2000-04-11 EP EP00107732A patent/EP1103988B1/en not_active Expired - Lifetime
- 2000-04-11 DE DE60024399T patent/DE60024399T2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101506911B (en) * | 2006-08-31 | 2011-04-06 | Abb技术有限公司 | High voltage bushing |
Also Published As
Publication number | Publication date |
---|---|
DE60024399D1 (en) | 2006-01-05 |
ITMI992481A0 (en) | 1999-11-26 |
EP1103988A2 (en) | 2001-05-30 |
ITMI992481A1 (en) | 2001-05-26 |
IT1313854B1 (en) | 2002-09-24 |
DE60024399T2 (en) | 2006-08-17 |
EP1103988A3 (en) | 2002-01-02 |
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