GB2289803A - Outdoor insulating bushing - Google Patents
Outdoor insulating bushing Download PDFInfo
- Publication number
- GB2289803A GB2289803A GB9409020A GB9409020A GB2289803A GB 2289803 A GB2289803 A GB 2289803A GB 9409020 A GB9409020 A GB 9409020A GB 9409020 A GB9409020 A GB 9409020A GB 2289803 A GB2289803 A GB 2289803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ring
- bushing
- insulating bushing
- flange
- enclosure
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 23
- 239000004020 conductor Substances 0.000 claims abstract description 16
- 239000000945 filler Substances 0.000 claims abstract description 5
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 4
- 239000004945 silicone rubber Substances 0.000 claims abstract description 4
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000654 additive Substances 0.000 claims abstract description 3
- 229920002943 EPDM rubber Polymers 0.000 claims abstract 2
- 230000000996 additive effect Effects 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 239000004412 Bulk moulding compound Substances 0.000 abstract description 2
- 239000003677 Sheet moulding compound Substances 0.000 abstract description 2
- 239000002216 antistatic agent Substances 0.000 abstract description 2
- 239000003365 glass fiber Substances 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- -1 Propylene Diene Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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
- H01B17/265—Fastening of insulators to support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
Abstract
In an outdoor insulating bushing for high voltage electrical devices, the insulating bushing 4 is moulded directly and concurrently on to a conductor rod 2 and a flange ring insert 6. The bushing 4 may be of ethylene propylene diene monomer or silicone rubber with an aluminium tri-hydrate filler and an arc-quenching additive, and the ring 6 of dough moulding compound with glass-fibre filler or sheet moulding compound antistatic material. The ring 6 is formed with a deep, circumferential, axial recess 16 and a central boss 18 arranged to be secured by means of anchor inserts 28 in register with an aperture in a wall of an associated enclosure (not shown). The lip 34 provides a secondary seal against the enclosure. Optionally a ring-type current transformer 12 may be positioned on the ring 6 and moulded into the rubber bushing 4 in a concurrent operation, with electrical-stud connections 30 for the transformer passing through the ring 6. <IMAGE>
Description
DESCRIPTION
This invention relates to an outdoor insulating bushing for high voltage electrical devices such as switching devices in which an electrical conductor is led into a switchgear enclosure whilst preventing ingress of moisture into the enclosure or, in some instances, leakage of gas from the enclosure, in an open air environment.
Hitherto, such bushings have been fabricated as rubber sheaths incorporating rain sheds on cast epoxy resin core tubes provided with head and base closures.
By the present invention there is provided an insulating bushing adapted to be sealingly connected through a wall of an electrical enclosure and including an axially extending electrical conductor rod, a rubber bushing moulded directly on to the conductor rod and on to a flange inset ring concurrently, the flange insert ring being arranged to receive threaded bolts securing the insulating bushing to the enclosure.
Axially outwardly of the flange insert ring the rubber bushing is preferably formed with a convoluted external surface, providing rain shed means to reduce any likelihood of flashover or arc creepage.
Optionally, the rubber bushing is moulded directly on to the conductor rod, the flange insert ring and on to a ring current transformer concurrently.
Electrical connection studs for the ring current transformer may be provided extending through the flange insert ring.
Alternatively, the rubber bushing is formulated as a silicone rubber composition.
Desirably, the flange ring insert is moulded in a high strength material having some electrically conductive properties.
In one embodiment of the invention, as shown in the accompanying, partly cut-away isometric view, an electrical conductor in the form of a cylindrical, copper, conductor rod 2 is provided with an insulating bushing including a directly moulded on rubber bushing 4. The rubber bushing, of Ethelyne Propylene Diene
Monomer or silicone rubber is injection, compression or transfer moulded directly on to the rod 2 and a flange ring insert 6 of Dough Moulding Compound together with glass fibre fillers or Sheet Moulding Compound
Antistatic material. The rubber bushing 4 is formed with a convoluted outer section 8, the convolutions providing rain sheds 10 designed to form an external surface having a low likelihood of flashover or arc creepage.As shown in the embodiment, a ring-type current transformer 12 is also positioned on the flange ring insert 6 and moulded into the rubber bushing 4, but it will be appreciated that this may be omitted in arrangements in which there is no requirement for a current transformer. An inner section 14 is formed with a deep axial recess 16 and a central boss 18 and is arranged to mate with an aperture in the associated enclosure. The conductor rod 2 is drilled and tapped at each end to provide for electrical connections. The flange ring insert 6 is moulded with a cylindrical section 20 having walls 22, 24 tapering from an annular flange 26 provided with six, equi-angularly spaced anchor inserts 28 on a common pitch circle to receive fixing bolts for securing the insulating bushing to an associated enclosure (not shown).Where a current transformer 12 is incorporated within the rubber bushing 4, electrical studs 30 may also be moulded into the flange ring insert 6 to provide connections from the transformer, through the flange ring insert. A circumferential groove 32 is formed in the annular flange 2 of the flange ring insert 6, radially outwardly of the anchor inserts 28 and, where provided, the electrical studs 30, to form an outer, circumferential lip 34 arranged to enhance sealing of the insulating bushing to the associated enclosure.
It will be appreciated that, by moulding the rubber bushing 4 directly on to the conductor rod 2 an impervious seal is obtained between the rubber bushing and the conductor rod. Upon assembly of the insulated bushing on to an associated enclosure an effective bolted seal between the flange ring insert 6 and a seating on the enclosure is readily obtainable thereby preventing ingress of moisture or leakage of insulating gas, such as sulphur hexafluoride, from the associated enclosure. The mating of the inner section with the associated aperture in the enclosure and the mating of the circumferential lip 34 with the seating on the enclosure provide secondary seals, thereby enhancing the sealing of the insulating bushing to the enclosure.
In addition, it will be appreciated that by directly moulding the insulating bushing on to the rod conductor economies of cost, material and time may be achieved over arrangements in which a cast epoxy resin or polyurethane core tube is provided with a rubber sheath and end seals co-acting with electrical conductors.
Furthermore, where it is required to incorporate a current transformer in the assembly moulding the current transformer 12 into the rubber bushing 4 effectively achieves encapsulation of the current transformer as a part of the fabrication operation with corresponding savings.
The rubber between the flange ring and the conductor is subject to high elastical stress and accordingly is formulated such that :
1. It exhibits high dielectric strength.
2. It exhibits high electrical resistivity
(i.e.low loss tangent).
This is achieved by balancing the elastomer formulation, filling material formulation and the method of effecting cross-linking (vulcanisation).
Furthermore the material is required to exhibit high resistance to electrical tracking. Fillers such as aluminium tri-hydrate coupled with arc-quenching additives have been found to be efficacious. In addition, the material is required to be resistant to chemical degradation (with or without any applied electrical stress) due to chemical attack, environmental erosion or the adverse effects of ultra-violet light.
Claims (11)
1. An insulating bushing adapted to be sealingly connected through a wall of an electrical enclosure and including an axially extending electrical conductor rod, a rubber bushing moulded directly on to the conductor rod and on to a flange inset ring concurrently, the flange insert ring being arranged to receive threaded bolts securing the insulating bushing to the enclosure.
2. An insulating bushing as claimed in Claim 1, wherein axially outwardly of the flange insert ring the rubber bushing is formed with a convoluted external surface, providing rain shed means to reduce any likelihood of flashover or arc creepage.
3. An insulating bushing as claimed in Claim 1 or
Claim 2, wherein the rubber bushing is moulded directly on to the conductor rod, the flange insert ring and on to a ring current transformer concurrently.
4. An insulating bushing as claimed in Claim 3, wherein electrical connection studs for the ring current transformer are provided extending through the flange insert ring.
5. An insulating bushing as claimed in any preceding
Claim, wherein the rubber bushing is formulated as an
Ethylene Propylene Diene Monomer composition.
6. An insulating bushing as claimed in any one of
Claims 1 to 4, wherein the rubber bushing is formulated as a silicone rubber composition.
7. An insulating bushing as claimed in Claim 5 or
Claim 6, wherein the rubber bushing includes an aluminium tri-hydrate filler coupled with an arcquenching additive.
8. An insulating bushing as claimed in any preceding
Claim, wherein the flange ring insert is moulded in a high strength material having some electrically conductive properties.
9. An insulating bushing as claimed in any preceding
Claim, wherein the flange ring insert is formed with an annular face adapted to mate with a seating formed on an associated enclosure, anchor inserts being provided in the flange ring insert to receive fixing bolts for securing the insulating bushing to the enclosure.
10. An insulating bushing as claimed in Claim 9, wherein the flange ring insert is formed with circumferential lip radially outwardly of the annular flange arranged to enhance sealing of the insulating bushing to the associated enclosure.
11. An insulating bushing arranged and constructed substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9409020A GB2289803B (en) | 1994-05-06 | 1994-05-06 | Outdoor insulating bushing for high voltage electrical devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9409020A GB2289803B (en) | 1994-05-06 | 1994-05-06 | Outdoor insulating bushing for high voltage electrical devices |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9409020D0 GB9409020D0 (en) | 1994-06-22 |
| GB2289803A true GB2289803A (en) | 1995-11-29 |
| GB2289803B GB2289803B (en) | 1997-10-22 |
Family
ID=10754674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9409020A Expired - Lifetime GB2289803B (en) | 1994-05-06 | 1994-05-06 | Outdoor insulating bushing for high voltage electrical devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2289803B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10037328A1 (en) * | 1999-09-21 | 2001-05-17 | Kg Ritz Messwandler G M B H & | Device for taking high-voltage conductors through three-dimensional bodies comprises a closure element and a base element with at least one cavity for accommodation of secondary elements |
| DE10005164A1 (en) * | 2000-02-08 | 2001-08-09 | Abb Research Ltd | Implementation for a high-voltage device |
| EP2618341A2 (en) * | 2012-01-23 | 2013-07-24 | General Electric Company | High voltage bushing assembly |
| EP2626869A3 (en) * | 2012-02-08 | 2015-04-29 | General Electric Company | Corona resistant high voltage bushing assembly |
| WO2019025023A1 (en) * | 2017-08-03 | 2019-02-07 | Südkabel GmbH | Insertable feed-through |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3978277A (en) * | 1974-01-14 | 1976-08-31 | Hughes Aircraft Company | High voltage terminal bushing for use in high voltage circuits |
| US4965407A (en) * | 1988-12-09 | 1990-10-23 | Cooper Industries, Inc. | Modular bushing |
-
1994
- 1994-05-06 GB GB9409020A patent/GB2289803B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3978277A (en) * | 1974-01-14 | 1976-08-31 | Hughes Aircraft Company | High voltage terminal bushing for use in high voltage circuits |
| US4965407A (en) * | 1988-12-09 | 1990-10-23 | Cooper Industries, Inc. | Modular bushing |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10037328A1 (en) * | 1999-09-21 | 2001-05-17 | Kg Ritz Messwandler G M B H & | Device for taking high-voltage conductors through three-dimensional bodies comprises a closure element and a base element with at least one cavity for accommodation of secondary elements |
| DE10005164A1 (en) * | 2000-02-08 | 2001-08-09 | Abb Research Ltd | Implementation for a high-voltage device |
| EP2618341A2 (en) * | 2012-01-23 | 2013-07-24 | General Electric Company | High voltage bushing assembly |
| EP2618341A3 (en) * | 2012-01-23 | 2015-04-29 | General Electric Company | High voltage bushing assembly |
| RU2608182C2 (en) * | 2012-01-23 | 2017-01-17 | Дженерал Электрик Компани | High-voltage bushing assembly |
| EP2626869A3 (en) * | 2012-02-08 | 2015-04-29 | General Electric Company | Corona resistant high voltage bushing assembly |
| RU2608836C2 (en) * | 2012-02-08 | 2017-01-25 | Дженерал Электрик Компани | Corona-proof high-voltage insulation bushing unit and device |
| WO2019025023A1 (en) * | 2017-08-03 | 2019-02-07 | Südkabel GmbH | Insertable feed-through |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2289803B (en) | 1997-10-22 |
| GB9409020D0 (en) | 1994-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20111124 AND 20111129 |
|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20140505 |