EP0843322A2 - Composite insulators - Google Patents
Composite insulators Download PDFInfo
- Publication number
- EP0843322A2 EP0843322A2 EP97308997A EP97308997A EP0843322A2 EP 0843322 A2 EP0843322 A2 EP 0843322A2 EP 97308997 A EP97308997 A EP 97308997A EP 97308997 A EP97308997 A EP 97308997A EP 0843322 A2 EP0843322 A2 EP 0843322A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shed
- portions
- diameter
- small
- housing
- 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
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- 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
- H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
Definitions
- the present invention relates to composite insulators. More particularly, the invention relates to staggered shed type composite insulator which comprises a core member made of FRP or the like and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material and in which the housing is constituted by larger-diameter shed portions and small-diameter shed portions alternatingly arranged via sheath portions.
- Fig. 1 shows a staggered shed type composite insulator in which a housing includes shed portions having the same large diameter and those having the same small diameter alternatively arranged one by one.
- Fig. 2 shows a staggered shed type composite insulator in which a housing includes large-diameter shed portions and small-diameter shed portions arranged such that two shed portions having the same small diameter are arranged between two adjacent large-diameter shed portions having the same diameter.
- Fig. 1 shows a staggered shed type composite insulator in which a housing includes shed portions having the same large diameter and those having the same small diameter alternatively arranged one by one.
- Fig. 2 shows a staggered shed type composite insulator in which a housing includes large-diameter shed portions and small-diameter shed portions arranged such that two shed portions having the same small diameter are arranged between two adjacent large-diameter shed portions having the same diameter.
- Fig. 1 shows a staggered shed type composite insulator in which
- FIG. 3 shows a staggered shed type composite insulator in which a housing includes large-diameter shed portions and small-diameter shed portions arranged such that two small-diameter shed portions having different diameters are arranged between two adjacent large-diameter shed portions having the same diameter.
- “Staggered shed type composite insulator” to which the present invention is applicable means a shed portion-provided composite insulators comprising a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, in which the housing comprises large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portions are alternatively arranged via the sheath portions.
- the small-diameter shed portions may have the same diameter or different diameters.
- the large-diameter shed portions may also have the same diameter or different diameters.
- the pollution withstand voltage characteristic is accordingly improved.
- the composite insulator in which the housing can be arbitrarily molded different from the conventional porcelain insulators it is considered a desirable design from the standpoint of the pollution withstand voltage characteristic that the 1/p value is increased as much as possible by prolonging the leakage distance as much as possible relative to a given length of the insulator, that is, by extending the shed portions radially as much as possible and decreasing a distance between adjacent shed portions as much as possible.
- the present inventors proceeded with their study on the shape of the staggered shed type composite insulator from the standpoint of the pollution withstand voltage. As a result, it was clarified that there is some relationship between a straight distance from the tip of a large-diameter shed portion to a small-diameter shed portion and the pollution withstand voltage, and that the straight distance from the tip of the large-diameter shed portion to the small-diameter shed portion needs be optimized from the standpoint of the pollution withstand voltage (Second aspect of the Invention)
- the pollution withstand voltage is related to the ratio between the radial projection length "a" of the large-diameter shed portion and the axial unit length "p" of the housing, and that the ratio between the radial projection length "a” of the large-diameter shed portion and the axial unit length "p” of the housing needs to be optimized from the standpoint of the pollution withstand voltage (Third aspect of the invention).
- the present inventors made experiments and study in which pollution tests were actually conducted to examine (1) the relationship between the 1/p value and the pollution withstand voltage, (2) the relationship between the pollution withstand voltage and the straight distance "c" from the tip of the large-diameter shed portion to that of the small-diameter shed portion, and (3) the relationship between the pollution withstand voltage and the ratio "p/a" of the axial unit length "p” to the radial projection length "a” of the large-diameter shed portion.
- the pollution withstand voltage characteristic is not improved in one-way direction with respect to the 1/p value, but the pollution withstand voltage has a local maximum at an appropriate 1/p value, and decreases as the 1/p goes beyond this value so that the pollution withstand voltage exhibits a parabola-shaped characteristic. It was also clarified that by affording this appropriate 1/p value to the housing, the pollution withstand voltage characteristic is exhibited to the maximum to remove the necessity to excessively increase the volume of the rubbery material and solve the above problems.
- the staggered shed type composite insulator comprises a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the respective sheath portions, wherein "1/p” is in a range from 4.3 to 5.0 in which "1" and "p” are a unit surface-leakage distance and an axial unit length of the housing, respectively. (0005-1)
- the staggered shed type composite insulator comprises a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the respective sheath portions, wherein the straight distance from a radially outermost tip of the large-diameter shed portion to that of the small-diameter shed portion (a shed tip-to-tip distance) is 32 to 40 mm.
- the staggered shed type composite insulator comprises a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the respective sheath portions, wherein the ratio "p/a" is 0.75 to 1.0 in which "p" and "a” are the axial unit length between the adjacent large-diameter shed portions and the radial projection length of the large-diameter shed portion, respectively.
- This ratio is equally applicable to a case where the large-diameter shed portions have the same radial projection length and a case where all the large-diameter shed portions do not have the same radial projection length. That is, the ratio "p/a" is 0.75 to 1.0 in any case.
- the staggered shed type composite insulator according to the fourth aspect of the present invention comprises a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the sheath portions, said composite insulator having two or more of the features of the first to the third aspects of the present invention.
- “resistive voltage” of the ordinate means "withstand voltage per unit effective length (for example, 1 m)", that is, “50 % F.O.V. (flashover voltage) per unit effective length", which is a value obtained by dividing the average flashover voltage by the axial length of the insulator. Since the pollution withstand voltage is proportional to the 50 % F.O.V value, the former can be known from the latter.
- the pollution withstand voltages shown in Table 1 and Figures 5 to 7 are not absolute values, but relative values.
- Pollution withstand voltage characteristic of variously shaped shed portions of composite insulators Pitch p mm Radial projection lengths of shed portions a+b mm Leakage distance per each pitch 1/p mm p/a Tip-to-tip-distance between sheds mm ESDD, mg/cm 2 0.5 0.03 Pollution withstand voltage (Relative value) 50 70+50 5.32 0.71 32 90 93 55 70+50 4.93 0.79 34 95 99 60 70+50 4.60 0.86 36 100 102 70 70+50 4.09 1.00 40 98 95 75 70+50 3.88 1.07 42.5 97 92 80 70+50 3.70 1.14 45 94 88 85 70+50 3.54 1.21 47 91 85
- the optimum "1/p" value is not always identical over all conditions, but slightly changes depending upon the degree of pollution.
- the polluted degree can be represented by an equivalent salt deposit density (abbreviated as ESDD).
- ESDD equivalent salt deposit density
- the polluted degree was set at 0.03 to 0.5 mg/cm 2 , which range almost covers almost all possible cases in actually used states. This is the reason why the above range was employed in the experiments. The other experiments discussed below were also conducted in this range.
- the 1/p value which gives a value almost substantially not different from the maximum value in the polluted degree range of 0.03 to 0.5 mg/cm 2 in the actual use condition may be set in any point within the narrow range of 4.65 ⁇ 0.35.
- a composite insulator which always gives nearly the maximum pollution-resisting voltage characteristic over substantially all the actual use condition can be obtained.
- the pollution withstand voltage takes its maximum value somewhere with respect to the changes in the "1/p” value, the shed tip-to-tip distance "c" and/or the ratio "p/a” of the axial unit length to the radial projection length "a" of the large-diameter shed portion of the housing.
Landscapes
- Insulators (AREA)
Abstract
Description
(0005-1)
Pollution withstand voltage characteristic of variously shaped shed portions of composite insulators | ||||||
Pitch p mm | Radial projection lengths of shed portions a+b mm | Leakage distance per each | p/a | Tip-to-tip-distance between sheds mm | ESDD, mg/cm2 | |
0.5 | 0.03 | |||||
Pollution withstand voltage (Relative value) | ||||||
50 | 70+50 | 5.32 | 0.71 | 32 | 90 | 93 |
55 | 70+50 | 4.93 | 0.79 | 34 | 95 | 99 |
60 | 70+50 | 4.60 | 0.86 | 36 | 100 | 102 |
70 | 70+50 | 4.09 | 1.00 | 40 | 98 | 95 |
75 | 70+50 | 3.88 | 1.07 | 42.5 | 97 | 92 |
80 | 70+50 | 3.70 | 1.14 | 45 | 94 | 88 |
85 | 70+50 | 3.54 | 1.21 | 47 | 91 | 85 |
Claims (4)
- A staggered shed type composite insulator comprising a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the sheath portions, wherein "1/p" is in a range from 4.3 to 5.0 in which "1" and "p" are a unit surface-leakage distance and an axial unit length of the housing, respectively.
- A staggered shed type composite insulator comprising a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the respective sheath portions, wherein a straight distance from a radially outermost tip of the large-diameter shed portion to that of the small-diameter shed portion (a shed tip-to-tip distance) is 32 to 40 mm.
- A staggered shed type composite insulator comprising a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the respective sheath portions, wherein the ratio "p/a" is 0.75 to 1.0 in which "p" and "a" are an axial unit length between the adjacent large-diameter shed portions and a radial projection length of the large-diameter shed portion, respectively.
- A staggered shed type composite comprising a core member and a housing provided around the outer peripheral face of the core member and made of an insulating polymeric material, said housing comprising large-diameter shed portions, small-diameter shed portions and sheath portions arranged such that the large-diameter shed portions and the small-diameter shed portion are alternatively arranged via the sheath portions arranged alternatively via the respective sheath portions, wherein the composite insulator has two or more features selected from the following (1) through (3):(1) "1/p" is in a range from 4.3 to 5.0 in which "1" and "p" are a unit surface-leakage distance and an axial unit length of the housing, respectively;(2) the straight distance from a radially outermost tip of the large-diameter shed portion to that of the small-diameter shed portion (a shed tip-to-tip distance) is 32 to 40 mm; and(3) a ratio "p/a" is 0.75 to 1.0 in which "p" and "a" are an axial unit length between the adjacent large-diameter shed portions and a radial projection length of the large-diameter shed portion, respectively.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30261196 | 1996-11-14 | ||
JP302611/96 | 1996-11-14 | ||
JP30261196A JP3445454B2 (en) | 1996-11-14 | 1996-11-14 | Composite insulator |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0843322A2 true EP0843322A2 (en) | 1998-05-20 |
EP0843322A3 EP0843322A3 (en) | 1998-12-23 |
EP0843322B1 EP0843322B1 (en) | 2002-05-08 |
Family
ID=17911074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970308997 Revoked EP0843322B1 (en) | 1996-11-14 | 1997-11-10 | Composite insulators |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0843322B1 (en) |
JP (1) | JP3445454B2 (en) |
DE (1) | DE69712442T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3079159A4 (en) * | 2014-05-21 | 2017-07-19 | Beijing Railway Institute Of Mechanical & Electrical Engineering Co., Ltd. | Electric multiple unit car-roof antifouling flash composite insulator |
EP3147914A4 (en) * | 2014-05-21 | 2018-01-03 | Beijing Railway Institute Of Mechanical & Electrical Engineering Co., Ltd. | Interface puncturing-proof electric multiple unit car-roof composite insulator |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101567238B (en) * | 2008-04-24 | 2011-01-12 | 抚顺电瓷制造有限公司 | Direct-current solid-core post porcelain insulator |
CN101834040A (en) * | 2010-04-26 | 2010-09-15 | 山西省电力公司阳泉供电分公司 | Specially synthetic insulator of transmission line of 220kV |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991006106A1 (en) * | 1989-10-17 | 1991-05-02 | Raychem Limited | Electrical insulator |
WO1995006552A2 (en) * | 1993-09-03 | 1995-03-09 | Raychem Corporation | Molding methods, track resistant silicone elastomer compositions and improved molded parts with better arcing, flashover and pollution resistance |
-
1996
- 1996-11-14 JP JP30261196A patent/JP3445454B2/en not_active Expired - Lifetime
-
1997
- 1997-11-10 DE DE1997612442 patent/DE69712442T2/en not_active Revoked
- 1997-11-10 EP EP19970308997 patent/EP0843322B1/en not_active Revoked
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991006106A1 (en) * | 1989-10-17 | 1991-05-02 | Raychem Limited | Electrical insulator |
WO1995006552A2 (en) * | 1993-09-03 | 1995-03-09 | Raychem Corporation | Molding methods, track resistant silicone elastomer compositions and improved molded parts with better arcing, flashover and pollution resistance |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3079159A4 (en) * | 2014-05-21 | 2017-07-19 | Beijing Railway Institute Of Mechanical & Electrical Engineering Co., Ltd. | Electric multiple unit car-roof antifouling flash composite insulator |
EP3147914A4 (en) * | 2014-05-21 | 2018-01-03 | Beijing Railway Institute Of Mechanical & Electrical Engineering Co., Ltd. | Interface puncturing-proof electric multiple unit car-roof composite insulator |
US10179594B2 (en) | 2014-05-21 | 2019-01-15 | Beijing Railway Institute Of Mechanical & Electrical Engineering Co., Ltd. | Anti-pollution-flashover locomotive roof composite insulator |
Also Published As
Publication number | Publication date |
---|---|
DE69712442D1 (en) | 2002-06-13 |
EP0843322A3 (en) | 1998-12-23 |
JPH10144166A (en) | 1998-05-29 |
EP0843322B1 (en) | 2002-05-08 |
DE69712442T2 (en) | 2002-12-12 |
JP3445454B2 (en) | 2003-09-08 |
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