DK3312622T3 - Isolator til elektriske luftledninger med en beskyttet lækstrømsdetektor - Google Patents
Isolator til elektriske luftledninger med en beskyttet lækstrømsdetektor Download PDFInfo
- Publication number
- DK3312622T3 DK3312622T3 DK17194631.2T DK17194631T DK3312622T3 DK 3312622 T3 DK3312622 T3 DK 3312622T3 DK 17194631 T DK17194631 T DK 17194631T DK 3312622 T3 DK3312622 T3 DK 3312622T3
- Authority
- DK
- Denmark
- Prior art keywords
- ring
- insulator according
- electrical overhead
- dielectric
- protective element
- Prior art date
Links
- 239000012212 insulator Substances 0.000 title claims description 56
- 230000001681 protective effect Effects 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000011521 glass Substances 0.000 claims description 14
- 229920002943 EPDM rubber Polymers 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 240000004752 Laburnum anagyroides Species 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
-
- 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
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
-
- 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
- H01B17/005—Insulators structurally associated with built-in electrical equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- 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
- H01B17/04—Chains; Multiple chains
-
- 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
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
-
- 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
- H01B17/56—Insulating bodies
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
- Transformers For Measuring Instruments (AREA)
Claims (12)
1. Isolator til elektriske luftledninger, som omfatter et dielektrisk endeelement (4, 4'), der har en overflade i form af et skørt, og som er aksialt forlænget med et metalbeslag (7, 7') til fastgørelse af isolatoren, og en indretning til detektering af tab af elektrisk overfladestrøm, som strømmer på den udvendige overflade af det dielektriske element, som omfatter en metalring (8) i elektrisk kontakt med den udvendige overflade af det dielektriske element (4, 4') for at opfange tabet af overfladestrømmen, kendetegnet ved, at den omfatter et elektrisk isolerende beskyttelseselement (10) i form af en muffe med krave, hvor muffen af beskyttelseselementet er anbragt mellem ringen (8) og beslaget (7, 7'), og kraven af beskyttelseselementet strækker sig radialt for at rage frem over ringen (8) for at danne en beskyttelsesskærm.
2. Isolator til elektriske luftledninger ifølge krav 1, hvor ringen (8) er klæbet til den udvendige overflade i form af et skørt af det dielektriske element med et strømledende klæbemiddel.
3. Isolator til elektriske luftledninger ifølge krav 1 eller 2, hvor beskyttelseselementet (10) er af ethylenpropylendienmonomer (EPDM) eller af silikone.
4. Isolator til elektriske luftledninger ifølge et af kravene 1 til 3, hvor detekteringsindretningen omfatter en omformer (9A) af lækstrømmen til spænding.
5. Isolator til elektriske luftledninger ifølge krav 4, hvor omformeren (9A) er nedsænket i beskyttelseselementet (10).
6. Isolator til elektriske luftledninger ifølge krav 4, hvor omformeren (9A) er nedsænket i metalbeslaget.
7. Isolator til elektriske luftledninger ifølge krav 4, hvor omformeren (9A) er fjernet fra isolatoren.
8. Isolator til elektriske luftledninger ifølge et af kravene 1 til 7, hvor det dielektriske element (4) er af glas.
9. Isolator til elektriske luftledninger ifølge et af kravene 1 til 7, hvor det dielektriske element (4) er af porcelæn.
10. Isolator til elektriske luftledninger ifølge etaf kravene 1 til 7, hvor det dielektriske element (4') er af syntetisk materiale.
11. Isolator til elektriske luftledninger ifølge et af de foregående krav, hvor kraven (1 OB) af det dielektriske element (4, 4') har en keglestubform.
12. Isolator til elektriske luftledninger ifølge et af de foregående krav, hvor kraven (1 OB) af beskyttelseselementet gennemskæres på tæt måde af et elektrisk kabel (11), som er forbundet med ringen (8).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1660093A FR3057697B1 (fr) | 2016-10-18 | 2016-10-18 | Isolateur pour lignes electriques aeriennes avec un detecteur de courant de fuite protege |
Publications (1)
Publication Number | Publication Date |
---|---|
DK3312622T3 true DK3312622T3 (da) | 2019-02-04 |
Family
ID=57796547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK17194631.2T DK3312622T3 (da) | 2016-10-18 | 2017-10-03 | Isolator til elektriske luftledninger med en beskyttet lækstrømsdetektor |
Country Status (18)
Country | Link |
---|---|
US (1) | US10274531B2 (da) |
EP (1) | EP3312622B1 (da) |
JP (1) | JP6588063B2 (da) |
CN (1) | CN107958755B (da) |
AU (1) | AU2017245416B2 (da) |
BR (1) | BR102017022300B1 (da) |
CA (1) | CA2982644C (da) |
DK (1) | DK3312622T3 (da) |
ES (1) | ES2705162T3 (da) |
FR (1) | FR3057697B1 (da) |
HU (1) | HUE041702T2 (da) |
MX (1) | MX367219B (da) |
PL (1) | PL3312622T3 (da) |
PT (1) | PT3312622T (da) |
RU (1) | RU2689303C2 (da) |
TN (1) | TN2017025788A1 (da) |
TR (1) | TR201902184T4 (da) |
UA (1) | UA120293C2 (da) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11443155B2 (en) * | 2018-01-19 | 2022-09-13 | Lindsey Manufacturing Company | Insulator leakage current detector and method of detecting insulator leakage current |
KR102157842B1 (ko) * | 2018-11-13 | 2020-09-18 | 한국전력공사 | 현수애자 절연보호 구조체 |
FR3109450B1 (fr) | 2020-04-16 | 2022-04-01 | Sediver | Isolateur de ligne electrique aerienne comprenant un dispositif de mesure de courant de fuite a autonomie prolongee |
IT202200002357A1 (it) * | 2022-02-09 | 2023-08-09 | Eb Rebosio S R L | Isolatore elettrico |
FR3138234B1 (fr) | 2022-07-20 | 2024-06-21 | Sediver | Isolateur pour lignes électriques aériennes avec un dispositif de détection de charge mécanique |
CN115144790B (zh) * | 2022-09-02 | 2022-11-18 | 山东理工大学 | 一种高压绝缘子泄漏电流在线监测***及方法 |
Family Cites Families (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1691330A (en) * | 1927-06-10 | 1928-11-13 | Ohio Brass Co | Insulator |
US1725097A (en) * | 1927-06-16 | 1929-08-20 | Westinghouse Electric & Mfg Co | Insulator structure |
US2023808A (en) * | 1933-02-16 | 1935-12-10 | Locke Insulator Corp | Shielded cemented type insulator |
JPS4215973Y1 (da) * | 1965-12-28 | 1967-09-13 | ||
US3848076A (en) * | 1973-12-17 | 1974-11-12 | H Greber | Supplemental insulation with bypass impedance for electrical lines |
US4107455A (en) * | 1977-06-02 | 1978-08-15 | Richards Clyde N | Linear insulator with alternating nonconductive sheds and conductive shields |
JPS6062719U (ja) * | 1983-10-06 | 1985-05-02 | 日本碍子株式会社 | 耐塩碍子 |
FR2590398B1 (fr) * | 1985-11-15 | 1988-09-09 | Ceraver | Dispositif de protection d'un capot d'isolateur electrique de suspension contre la corrosion |
JPH01180470A (ja) * | 1988-01-11 | 1989-07-18 | Sumitomo Electric Ind Ltd | 碍子漏れ電流測定装置 |
GB8802841D0 (en) * | 1988-02-08 | 1988-03-09 | Raychem Ltd | High voltage insulator |
JPH02152120A (ja) * | 1988-12-02 | 1990-06-12 | Ngk Insulators Ltd | 劣化表示碍子 |
JPH02296160A (ja) * | 1989-05-09 | 1990-12-06 | Sumitomo Electric Ind Ltd | 碍子の漏れ電流測定装置 |
JPH04249814A (ja) * | 1990-12-28 | 1992-09-04 | Ngk Insulators Ltd | 碍子 |
AU4632493A (en) * | 1992-06-12 | 1994-01-04 | Maclean-Fogg Company | Weathershed |
JPH06111649A (ja) * | 1992-09-25 | 1994-04-22 | Yazaki Corp | 碍子用塩害防止治具 |
JPH07249332A (ja) * | 1994-03-11 | 1995-09-26 | Meidensha Corp | 避雷器 |
JP3759219B2 (ja) * | 1996-02-07 | 2006-03-22 | 東北特殊鋼株式会社 | 碍子 |
JP3457150B2 (ja) * | 1997-06-18 | 2003-10-14 | 財団法人鉄道総合技術研究所 | セラミックがいし塗膜用シリコーン組成物 |
JP2000067670A (ja) | 1998-08-24 | 2000-03-03 | Nissin Electric Co Ltd | 碍子の漏れ電流測定装置 |
JP2003233116A (ja) * | 2001-12-06 | 2003-08-22 | Fuji Photo Film Co Ltd | 火災監視用写真撮影装置 |
FR2854275B1 (fr) * | 2003-04-23 | 2005-06-03 | Sediver | Isolateur de suspension avec un bouchon d'etancheite |
CN2715164Y (zh) | 2004-07-09 | 2005-08-03 | 杭州东信电力科技有限公司 | 高压输电线路绝缘子泄漏电流集流环 |
DE102008009333A1 (de) * | 2008-02-14 | 2009-08-20 | Lapp Insulator Gmbh & Co. Kg | Feldgesteuerter Verbundisolator |
US8426736B2 (en) * | 2009-07-17 | 2013-04-23 | The Invention Science Fund I Llc | Maintaining insulators in power transmission systems |
WO2011020304A1 (zh) * | 2009-08-21 | 2011-02-24 | 淄博泰光电力器材厂 | 悬式绝缘子和悬式绝缘子组 |
WO2012131180A1 (fr) * | 2011-03-31 | 2012-10-04 | Sediver Societe Europeenne D'isolateurs En Verre Et Composite | Élément diélectrique pour isolateur haute tension à haute résistance mécanique en traction |
JP2012226867A (ja) * | 2011-04-15 | 2012-11-15 | Kansai Electric Power Co Inc:The | ポリマー材料を用いた懸垂がいし |
RU142989U1 (ru) * | 2013-05-15 | 2014-07-10 | Общество с ограниченной ответственностью "Стример Мск" | Высоковольтный изолятор для высоковольтной линии электропередачи и высоковольтная линия электропередачи |
US9535105B2 (en) * | 2013-12-12 | 2017-01-03 | Electric Power Research Institute, Inc. | Apparatus and method for measuring leakage currents on porcelain and glass insulator disc strings |
CN204065306U (zh) * | 2014-09-05 | 2014-12-31 | 钱克猷 | 一种盘式绝缘子串表面泄漏电流集流装置 |
WO2016052314A1 (ja) * | 2014-09-29 | 2016-04-07 | 三菱電機株式会社 | 絶縁劣化監視装置 |
-
2016
- 2016-10-18 FR FR1660093A patent/FR3057697B1/fr active Active
-
2017
- 2017-10-03 EP EP17194631.2A patent/EP3312622B1/fr active Active
- 2017-10-03 PL PL17194631T patent/PL3312622T3/pl unknown
- 2017-10-03 DK DK17194631.2T patent/DK3312622T3/da active
- 2017-10-03 HU HUE17194631A patent/HUE041702T2/hu unknown
- 2017-10-03 ES ES17194631T patent/ES2705162T3/es active Active
- 2017-10-03 TR TR2019/02184T patent/TR201902184T4/tr unknown
- 2017-10-03 PT PT17194631T patent/PT3312622T/pt unknown
- 2017-10-04 TN TNP/2017/000425A patent/TN2017025788A1/fr unknown
- 2017-10-10 JP JP2017196600A patent/JP6588063B2/ja active Active
- 2017-10-11 RU RU2017136105A patent/RU2689303C2/ru active
- 2017-10-13 AU AU2017245416A patent/AU2017245416B2/en active Active
- 2017-10-16 CA CA2982644A patent/CA2982644C/fr active Active
- 2017-10-17 US US15/786,017 patent/US10274531B2/en active Active
- 2017-10-17 UA UAA201709966A patent/UA120293C2/uk unknown
- 2017-10-17 MX MX2017013386A patent/MX367219B/es active IP Right Grant
- 2017-10-17 BR BR102017022300-0A patent/BR102017022300B1/pt active IP Right Grant
- 2017-10-18 CN CN201710970608.0A patent/CN107958755B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
JP2018067540A (ja) | 2018-04-26 |
BR102017022300A2 (pt) | 2018-06-12 |
CA2982644C (fr) | 2019-06-25 |
PL3312622T3 (pl) | 2019-05-31 |
US10274531B2 (en) | 2019-04-30 |
AU2017245416B2 (en) | 2019-01-17 |
EP3312622A1 (fr) | 2018-04-25 |
RU2017136105A3 (da) | 2019-04-11 |
RU2017136105A (ru) | 2019-04-11 |
TR201902184T4 (tr) | 2019-03-21 |
NZ736388A (en) | 2019-01-25 |
RU2689303C2 (ru) | 2019-05-27 |
UA120293C2 (uk) | 2019-11-11 |
FR3057697B1 (fr) | 2020-02-14 |
MX2017013386A (es) | 2018-09-28 |
JP6588063B2 (ja) | 2019-10-09 |
HUE041702T2 (hu) | 2019-05-28 |
EP3312622B1 (fr) | 2018-11-21 |
FR3057697A1 (fr) | 2018-04-20 |
PT3312622T (pt) | 2019-01-23 |
CA2982644A1 (fr) | 2018-04-18 |
ES2705162T3 (es) | 2019-03-22 |
CN107958755A (zh) | 2018-04-24 |
CN107958755B (zh) | 2019-07-09 |
AU2017245416A1 (en) | 2018-05-10 |
TN2017025788A1 (fr) | 2019-04-12 |
US20180106846A1 (en) | 2018-04-19 |
BR102017022300B1 (pt) | 2023-03-14 |
MX367219B (es) | 2019-08-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK3312622T3 (da) | Isolator til elektriske luftledninger med en beskyttet lækstrømsdetektor | |
US4467387A (en) | Combination strut insulator and lightning arrester | |
US20030022556A1 (en) | Cable terminal | |
CN102906955A (zh) | 高压直流电缆终端装置 | |
US9970976B2 (en) | Composite insulator for an overhead power line with a protected leakage current detector | |
KR101146480B1 (ko) | 초고압 전력케이블 접속함의 부분방전측정용 연결단자함 | |
NZ736388B (en) | An overhead power line insulator with a protective leakage current detector | |
RU152791U1 (ru) | Сквозной наконечник внутристенного кабеля | |
US10444271B2 (en) | Device for monitoring an electrical conductor and electrical installaton comprising such a device | |
CN115458257A (zh) | 用于地线分段绝缘化的装置、保护设备及方法 | |
CN209232509U (zh) | 一种避雷器用硅橡胶防护罩 | |
US20080024141A1 (en) | Method and apparatus for insulating riggers | |
CN105810370A (zh) | 一种组合式透明复合悬式绝缘子 | |
KR20060036469A (ko) | 비접촉식 센서 | |
CN107424690B (zh) | 一种绝缘子防污增爬裙 | |
CN214099286U (zh) | 一种悬浮式防雷绝缘子结构 | |
EP2099038A1 (en) | An electric insulator and a method of producing such an electric insulator | |
CN210182162U (zh) | 一种抗击穿瓷绝缘子 | |
KR102633469B1 (ko) | 자기 애자 누설전류 검출장치 | |
CN209591684U (zh) | 一种抗老化绝缘子 | |
JP6169118B2 (ja) | 電力ケーブルの気中終端接続部 | |
CN106935446B (zh) | 连接装置及断路器极柱 | |
CN112198610A (zh) | 一种分段绝缘智能光缆接头盒 | |
JPS636708A (ja) | 避雷機能を具備する絶縁支持装置 |