GB2473697A - A triple tension insulator string assembly having a lightning arrestor - Google Patents

A triple tension insulator string assembly having a lightning arrestor Download PDF

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Publication number
GB2473697A
GB2473697A GB201013149A GB201013149A GB2473697A GB 2473697 A GB2473697 A GB 2473697A GB 201013149 A GB201013149 A GB 201013149A GB 201013149 A GB201013149 A GB 201013149A GB 2473697 A GB2473697 A GB 2473697A
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GB
United Kingdom
Prior art keywords
triple
insulator assembly
lightning arrester
tension string
double
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
Application number
GB201013149A
Other versions
GB201013149D0 (en
GB2473697B (en
Inventor
Susumu Suzuki
Masayuki Matsuyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
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NGK Insulators Ltd
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Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of GB201013149D0 publication Critical patent/GB201013149D0/en
Publication of GB2473697A publication Critical patent/GB2473697A/en
Application granted granted Critical
Publication of GB2473697B publication Critical patent/GB2473697B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/05—Suspension arrangements or devices for electric cables or lines
    • 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
    • H01B17/02—Suspension insulators; Strain insulators
    • 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
    • H01B17/02—Suspension insulators; Strain insulators
    • H01B17/06—Fastening of insulator to support, to conductor, or to adjoining insulator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/14—Arcing horns
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/24—Installation of lines or cables on walls, ceilings or floors by means of insulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • 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
    • H01B17/02—Suspension insulators; Strain insulators
    • H01B17/04—Chains; Multiple chains

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Insulators (AREA)
  • Power Engineering (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)

Abstract

A triple yoke 12 is formed by connecting two double yokes 2 having link mounting holes 4 in their both ends with each other coaxially with central one of the link mounting holes 4, and insulator strings are mounted in the link mounting holes 4 through links 5 to form a triple tension string insulator assembly. A lightning arrester 10 is held in the vicinity of the centre axis of the triple tension string insulator assembly by a mounting adaptor 20 that overhangs toward the central link mounting hole 4 from one of the double yokes 2 (figs 5 and 6). A small balance weight 30 is mounted on the other double yoke 2 or outer one of the links 5 to keep balance of weight of the mounting adaptor 20.

Description

TRIPLE TENSION INSULATOR STRING ASSEMBLY HAVING LIGHTNING
PROTECTOR
Field of the Invention
The present invention relates to a triple tension insulator string assembly having a lightning arrester mainly used for overhead transmission lines.
Background of the Invention
Various insulator string assemblies are conventionally used for supporting the power conductors on a steel tower in an insulating manner. When a tensile load applied to the insulator string assembly is high, a double tension insulator assembly or a triple tension insulator string assembly is used as shown in Japanese Patent Publication No.1997-233661. In many cases, a lightning arrester is mounted on the insulator assembly to prevent the line faults of the overhead transmission lines due to flashover of the insulator assembly by lightning.
This lightning arrester is disposed zinc oxide devices in the container in series, which have nonlinear voltage-current characteristics that have high resistance at operating system voltage of its system and have low resistance at lightning overvoltage. The outer side of the lightning arrester is covered with a housing, and a discharge electrode is mounted on an end-fitting of the arrester. Current does not always flow, because the arrester unit isolated from conductor with series gap. But when the lightning strikes on the tower or the conductor, the voltage generated in the insulator assembly is suppressed in according to the voltage-current characteristics of the zinc oxide elements, and follow current is also interrupted in a short time. Therefore, an line fault due to lightning is prevented. In the case of a lightning arrester for transmission line of 275 kV, the arrester has large size, a length with 1 m or more and a weight with several tens of kg.
In the double tension string insulator assembly or the triple tension string insulator assembly, both a tower side and a line side are connected by a flat plate-like metal fitting called yoke so that the tensile load is equally shared by each of the double or triple insulator strings. Fig. 1 is a plan vjewofadoubletensionstringiflsUlatOrasSerflbly. Twotension insulator strings 1 are supported in parallel to each other by a double yoke 2 on the tower side and a double yoke 3 on the line side. Link mounting holes 4 are formed in both ends of each of the yokes. The insulator strings 1 are mounted in the link mounting holes 4 through links 5. Another metal fitting-mounting hole 6 is formed in a center of the double yoke 2, and the metal fitting-mounting hole 6 is connected to a steel tower arm 7.
A triple tension string insulator assembly shown in Fig. 2 has two double yokes 2, link mounting holes 4 are formed in both ends of each of the double yokes 2, the double yokes 2 are connected to each other coaxially with center one of link mounting holes 4, whereby a triple yoke is formed. Each insulator string 1 is mounted to the link mounting holes 4 through links 5. When the power conductor swings or the tension insulator string swings, the two double yokes 2 move, whereby adjustment is automatically performed such that the three tension insulator strings 1 equally share a tensile load.
When the arrester 10 is mounted on the double tension string insulator assembly, the arrester 10 is mounted on a central position of the double yoke 2 with consideration of the weight balance. When the arrester 10 is mounted on the triple tension string insulator assembly, it seems to be possible to employ such a method that the arrester is mounted on a center axis of the triple tension string insulator assembly so that the lightning protector is mounted on a center axis of the double tension string insulator assembly. However, when the arrester is mounted according to this method, it is necessary to fix the arrester by a mounting adaptor that is fixed the two double yokes as shown in Fig. 3. In this case, motion of the two double yokes 2 is hindered by a base of the mounting adaptor shown with hatching, the function for adjusting the tensile load such that the tensile load is equally shared by the insulator strings is hindered. An undue load is applied to the two double yokes 2 and the mounting adaptor that is fixed the two double yokes 2.
To solve this problem, it seems to be possible to employ such a method that the arrester 10 is mounted on a central position of one of the double yokes 2, and a balance weight 11 is mounted on the other double yoke 2 as shown in Fig. 2. However, in the case of an arrester for 275 kV, the weight of the arrester 10 is very heavy as heavy as several tens of kg as described above. Therefore, the weight of the balance weight 11 also becomes equally heavy, and there is a problem that equipment cost is increased, and a installation work on the steel tower is not easy. It is not preferable to omit the balance weight 11 because a special load is applied to the link and a connection metal fitting due to torsion, and strength and durability are deteriorated.
Summary of the Invention
It is an object of the present invention to solve the conventional problem, and to provide a triple tension string insulator assembly having a lightning arrester that can reduce the weight of the balance weight although the tension string insulator assembly includes the heavy arrester, that does not lose weight balance, and that does not impair the function of the triple tension string insulator assembly.
The present invention has been accomplished to solve the above problem, and the invention provides a triple tension string insulator assembly having an arrester in which a triple yoke is formed by connecting two double yokes having link mounting holes in their both ends with each other coaxially with central one of the link mounting holes, wherein the triple tension string insulator assembly comprises: a triple tension string insulator assembly having insulator strings mounted in the link mounting holes through links; the arrester held in the vicinity of the center axis of the triple tension string insulator assembly by a mounting adaptor that overhangs toward the central link mounting hole from one of the double yokes; and preferably a small balance weight mounted on the other double yoke or outer one of the links to keep balance of weight of the mounting adaptor.
It is possible to employ such structures that an arcing horn forming a discharge gap between the end of electrodes of the arrester is mounted between the links on both outer ends of the triple yoke located on the opposite side from the arrester, and that a arrester is mounted instead of the arcing horn, and the discharge gap is formed between the lightning protectors on the both sides.
The triple tension string insulator assembly having the lightning arrester of the present invention holds the lightning arrester in the vicinity of a center axis of the triple tension string insulator assembly by a mounting adaptor of the arrester that overhangs toward a central link mounting hole from one of double yokes, and the triple tension string insulator assembly has a small balance weight for keeping the balance of the weight of the mounting adaptor. Therefore, even if the lightning arrester is heavy as heavy as several tens of kg, the entire insulator assembly does not get out of balance. Therefore, the balance weight can be reduced in weight, and since the weight balance does not lose balance, a special load caused by torsion is not applied to the connecting metal fitting.
Brief Description of the Drawings
Fig. 1 is a plan view of a double tension string insulator assembly having a lightning arrester; Fig. 2 is a plan view of a conventional triple tension string insulator assembly having a lightning arrester; Fig. 3 is an explanatory diagram showing a state where a mounting adaptor for the arrester is mounted astride two double yokes; Fig. 4 is a plan view of a triple tension string insulator assembly having a lightning arrester according to the present invention; Fig. 5 is a front view of the triple tension string insulator assembly having the lightning arrester of the invention; and Fig. 6 is an enlarged plan view of a mounting adaptor for the lightning arrester.
Detailed Description of the Invention
An embodiment of the present invention will be described below.
FIgs. 4 and 5 show an embodiment of the invention. Link mounting holes 4 are formed in both ends of each of two double yokes 2. The two double yokes 2 are connected to each other coaxially with the central link mounting holes 4 such that the double yokes 2 can bend, whereby a triple yoke 12 is formed.
In this embodiment, a tower side and a line side of the triple yoke 12 have the same structures, and an insulator string 1 is mounted on each link-mounting hole 4 through a link 5. A metal fitting-mounting hole 6 is formed in a center portion of each double yoke 2 on the tower side, and the double yoke 2 are connected to a steel tower arm through another link 13 and a metal fitting 14. Another metal fitting-mounting hole 6 is formed also in a center portion of the double yoke 2 on the line side, and electric feeding lines 18 are connected to the metal fitting-mounting holes 6 through other links 16 and another metal fitting 17.
In this embodiment, the lightning arrester 10 is fixed to the triple yoke 12 on the tower side by a mounting adaptor for the arrester 20. Zinc oxide elements are disposed in series in the lightning arrester 10 themselves as described above, an outer side of the lightning arrester 10 is covered with an outer housing, and an electrode is mounted on an end-fitting of the arrester. As shown in Fig. 6, the mounting adaptor 20 has a base 21 fixed to one of the double yokes 2 through a bolt, a the base plate of mounting adaptor 22 on a tip end thereof extends such as to overhang toward central one of the link mounting holes.
According to this structure, the heavy lightning arrester 10 is held in the vicinity of the center axis of the triple tension string insulator assembly, and the lightning protector 10 is mounted astride the two yokes 2 of the triple tension string insulator assembly such that motion of the yokes 2 is not hindered. The expression "in the vicinity of the center axis of the triple tension string insulator assembly" means that a deviation of about a diameter of the lightning protector 10 from the center axis of the triple tension string insulator assembly is permitted.
However, even if the lightning arrester 10 is held in the vicinity of the center axis of the triple tension string insulator assembly as described above, the weight of one of the double yokes 2 is increased by the weight of the mounting adaptor 20. Hence, according to the invention, a small balance weight 30 is mounted on the other double yoke 2 or its outer side link to solve the unbalanced weight. This small balance weight is a steel plated with zinc galvanizing for example. Its weight is only about 10 kg or less, and this is much lighter than the conventional balance weight 11 of several tens of kg shown in Fig. 2. Therefore, production cost is inexpensive, and the mounting operation on the steel tower becomes easy. The lightning arrester 10 is mounted at the location slightly deviated from the center axis of the triple tension string insulator assembly toward the opposite side as described above.
According to this configuration, the small balance weight 11 can be reduced in weight.
An arcing horn 40 is mounted between both the outer end links 5 and 5 of the triple yoke 12 located on the opposite side from the lightning arrester 10. The arcing horn 40 forms a -discharge gap G between electrodes of the lightning arrester 10. ThemountingmethOdOf the arcing horn 40 is not especially limited, a shape of the arcing horn 40 can variously be changed, and it is also possible to mount a lightning protector instead of the arcing horn 40.
The triple tension string insulator assembly having the lightning protector of the invention having the above-described configuration is the same as the conventional insulator assembly having the lightning arrester in that a tensile load is equally shared by the insulator strings 1 by supporting the three insulator strings 1 by the triple yoke 12, damage of the insulator assembly and flashover between the arcing horns are avoided by flowing lightning surge current to the lightning arrester 10 through the discharge gap G when the lightning strikes. However, according to the triple tension string insulator assembly having the lightning arrester of the invention, the entire weight balance is kept by the small balance weight 30 that is much lighter than that of the conventional technique, and a load caused by torsion can be prevented from generating in the connecting metal fitting.
Therefore, the production cost is reduced as compared with the conventional technique, and the installation work on the steel tower can become easy.
Although the lightning arrester 10 is mounted on the tower side of the insulator string 1 in the above-described embodiment, the lightning arrester 10 can be mounted on the line side. The lightning protectors 10 can be mounted on both the tower side and line side.

Claims (3)

  1. CLAIMS: l.A triple tension string insulator assembly having a lightning arrester in which a triple yoke is formed by connecting two double yokes having link mounting holes in their both ends with each other coaxially with central one of the link mounting holes, wherein the triple tension string insulator assembly comprises: a triple tension string insulator assembly having insulator strings mounted in the link mounting holes through links; the lightning arrester held in the vicinity of the center axis of the triple tension string insulator assembly by a horn-mounting metal fitting that overhangs toward the central link mounting hole from one of the double yokes; and a balance weight mounted on the other double yoke or outer one of the links to keep balance of weight of the mounting adaptor.
  2. 2. The triple tension string insulator assembly having a lightning arrester according to claim 1, wherein the lightning arrester or an arcing horn forming a discharge gap between discharge electrodes of the lightning arrester is mounted between the links on both outer ends of the triple yoke located on the opposite side from the lightning protector.
  3. 3. A triple tension string insulator assembly having a lightning arrester, substantially as herein described with reference to and as shown in Figs. 4 to 6 of the accompanying drawings.
GB201013149A 2009-09-18 2010-08-04 Triple tension insulator string assembly having lightning protector Expired - Fee Related GB2473697B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009216922A JP4878058B2 (en) 2009-09-18 2009-09-18 Triple tension insulator with lightning arrester

Publications (3)

Publication Number Publication Date
GB201013149D0 GB201013149D0 (en) 2010-09-22
GB2473697A true GB2473697A (en) 2011-03-23
GB2473697B GB2473697B (en) 2013-12-04

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GB201013149A Expired - Fee Related GB2473697B (en) 2009-09-18 2010-08-04 Triple tension insulator string assembly having lightning protector

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JP (1) JP4878058B2 (en)
KR (1) KR101644194B1 (en)
GB (1) GB2473697B (en)
HK (1) HK1151129A1 (en)
TW (1) TWI460950B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102280227A (en) * 2011-07-15 2011-12-14 山东电力集团公司烟台供电公司 Composite insulator tension string of overhead transmission line
CN102280226A (en) * 2011-07-15 2011-12-14 山东电力集团公司烟台供电公司 Composite insulator suspension string in overhead transmission line
JP5830482B2 (en) * 2013-03-21 2015-12-09 日本碍子株式会社 Lightning arrester mounting structure in tension insulator
CN104252926A (en) * 2014-10-13 2014-12-31 国家电网公司 Combined type strain insulator string of overhead transmission line
CN104252925A (en) * 2014-10-13 2014-12-31 国家电网公司 Combined insulator suspension string of overhead power transmission line
CN109300632A (en) * 2018-10-31 2019-02-01 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of linking insulator structure with lightning arrester
CN109961618B (en) * 2019-03-22 2020-09-01 国网湖南省电力有限公司 Composite insulator V-shaped arrangement anti-string-falling treatment and warning method

Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH09233661A (en) * 1996-02-26 1997-09-05 Kansai Electric Power Co Inc:The Three point supported double strain clamp

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JPH0621134Y2 (en) * 1990-06-18 1994-06-01 関西電力株式会社 Large bundle diameter multiconductor transmission line insulator
JPH04267011A (en) * 1991-02-22 1992-09-22 Ngk Insulators Ltd Lighting insulator device for power transmission line
JPH06162853A (en) * 1992-11-20 1994-06-10 Ngk Insulators Ltd Jumper wire supporting insulator device
JP2002093256A (en) * 2000-09-18 2002-03-29 Ngk Insulators Ltd Lightning protection insulator set
JP2003217790A (en) * 2002-01-17 2003-07-31 Asahi Tec Corp Lightning arresting device
JP2004303624A (en) * 2003-03-31 2004-10-28 Furukawa Electric Co Ltd:The Method of adjusting gap between arcing horns
JP4731171B2 (en) * 2005-01-17 2011-07-20 中国電力株式会社 A series of suspended insulator devices and their grounded metal fittings
JP5058493B2 (en) * 2006-02-13 2012-10-24 旭テックＴｄｍ株式会社 Tensile insulator

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Publication number Priority date Publication date Assignee Title
JPH09233661A (en) * 1996-02-26 1997-09-05 Kansai Electric Power Co Inc:The Three point supported double strain clamp

Also Published As

Publication number Publication date
KR20110031113A (en) 2011-03-24
JP4878058B2 (en) 2012-02-15
KR101644194B1 (en) 2016-07-29
TW201112556A (en) 2011-04-01
TWI460950B (en) 2014-11-11
HK1151129A1 (en) 2012-01-20
JP2011065928A (en) 2011-03-31
GB201013149D0 (en) 2010-09-22
GB2473697B (en) 2013-12-04

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