CN104979790A - Phase-to-phase spacer spring damping device - Google Patents

Phase-to-phase spacer spring damping device Download PDF

Info

Publication number
CN104979790A
CN104979790A CN201510421740.7A CN201510421740A CN104979790A CN 104979790 A CN104979790 A CN 104979790A CN 201510421740 A CN201510421740 A CN 201510421740A CN 104979790 A CN104979790 A CN 104979790A
Authority
CN
China
Prior art keywords
spring
inter
damping device
phase spacer
phase
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
CN201510421740.7A
Other languages
Chinese (zh)
Other versions
CN104979790B (en
Inventor
王晓涵
张志红
王茂成
陈海亮
李云稀
刘淑莉
谢文丽
王德刚
王金涛
王岩
纪振军
姚伟
王志凤
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.)
Penglai Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
Penglai Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Penglai Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical Penglai Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority to CN201510421740.7A priority Critical patent/CN104979790B/en
Publication of CN104979790A publication Critical patent/CN104979790A/en
Application granted granted Critical
Publication of CN104979790B publication Critical patent/CN104979790B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/12Devices for maintaining distance between parallel conductors, e.g. spacer
    • H02G7/125Damping spacers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/14Arrangements or devices for damping mechanical oscillations of lines, e.g. for reducing production of sound

Landscapes

  • Vibration Prevention Devices (AREA)
  • Springs (AREA)

Abstract

The present invention relates to a phase-to-phase spacer spring damping device which is especially suitable for a 35kV and above overhead transmission line, belonging to the technical field of power industry overhead transmission line equipment. The device comprises a spring cylinder with an upper spring and a lower spring inside. The top of the spring cylinder is provided with an upper connection piece for connecting a phase-to-phase spacer composite insulator. The upper spring and the lower spring are vertically arranged in the spring cylinder which is formed by a half cylinder I and a half cylinder II which are connected. The bottom of the spring cylinder is provided with a through hole for passing a piston type shaft rod which comprises pistons arranged at two ends of the shaft rod and a lower connection piece for connecting a line fitting. The pistons are in the spring cylinder and are between the upper spring and the lower spring, and the lower connection piece is outside the spring cylinder. The phase-to-phase spacer spring damping device has a rainproof function, a spring pressing function and a spring pulling function.

Description

A kind of inter-phase spacer spring damping device
Technical field
The present invention relates to a kind of inter-phase spacer spring damping device, be specially adapted to 35kV and the use of above overhead transmission line, belong to power industry overhead transmission line equipment technical field.
Background technology
In strong wind season, when in wind to power system transmission line wire, certain power will be produced, wire can be brought out thus and produce a kind of self-excited vibration, wave, now, just need to use a kind of conductor spacer with insulating properties and mechanical strength between alternate or loop, each wire mechanically couples together by conductor spacer, and the motion of each wire is restricted mutually, to reach the object suppressing to wave.
At present, some anti-dance devices and conductor spacer are there is in market, such as patent name is: a kind of damping type anti-jiggling machine, publication number are: the utility model patent of 201781254U, which disclose a kind of damping type anti-jiggling machine, comprise spacer, spring vibration-damping component and be connected to the column damping element on described spacer, can distortion power be discharged when wire is waved, effectively improve Anti-pull-press intensity and the elastic effect of spacer.This patent does not relate to telescopic spring dashpot, but adopts spring, and shortcoming is, during spring tension, the junction of spring and other connectors is insecure, under large-tonnage pulling force, easily occur phenomenon of rupture.
Patent name is: a kind of rotary type spring inter-phase spacer, publication number are: the utility model patent of 202663062U, the conductor spacer of this patent is connect by T-shaped veneer and phase insulation, arrange by the elastic construction of spring as energy storage in conductor spacer, when wire between circuit two-phase is waved, constantly stretching and contracting by spring, reach the sufficiency that destruction two phase conductor is waved, reach the object that pilot is waved.This patent does not relate to telescopic spring dashpot, but adopts spring, and shortcoming is, during spring tension, the junction of spring and other connectors is insecure, under large-tonnage pulling force, easily occur phenomenon of rupture.
Patent name is: a kind of spring shock absorption type interphase anti-galloping moves conductor spacer, publication number is: the utility model patent of 103594997A, this patent connects Anti-galloping spring damper at the middle part of two inter-phase spacer insulators by gold utensil, wave self-oscillation energy with release, this patent does not relate to telescopic spring dashpot, but adopts spring, shortcoming is, during spring tension, the junction of spring and other connectors is insecure, under large-tonnage pulling force, easily occur phenomenon of rupture.
Patent name is: a kind of dual spring end weakening type inter-phase spacer, publication number is: the utility model patent of 203760992U, this patent adopts two weakening spring end buffer structure, the self-oscillation energy that two telescopic spring dashpots have very first time absorption and cut down on circuit, reduce to greatest extent and wave energy along inter-phase spacer transmission, avoid the further stressed bending of circuit.This patent content does not introduce internal structure and the operation principle of telescopic spring dashpot further, applicant is through a large amount of internet hunt and patent consulting, for retrieving the associated description of telescopic spring dashpot, therefore telescopic spring dashpot is only a concept, the concrete structure of unexposed telescopic spring dashpot in prior art.
Summary of the invention
What the object of the invention is to the existence of solution prior art does not have rainproof function, unstable technical problem is connected with other connector during spring tension, there is provided one to have rainwater-proof function, the inter-phase spacer spring damping device that stage clip function can play again extension spring function can be played.
Inter-phase spacer spring damping device of the present invention is achieved through the following technical solutions:
A kind of inter-phase spacer spring damping device, its special character is that comprising inside is placed with upper spring 4, the spring strut 16 of lower spring 5, the top of spring strut 16 is provided with the upper connector for connecting inter-phase spacer composite insulator, upper spring 4 and lower spring 5 vertical arrangement in spring strut 16, spring strut 16 is by half cylindrical shell I 2 connected, half cylindrical shell II 3 is formed, the bottom of spring strut 16 is provided with for the passing hole through piston type axostylus axostyle 1, piston type axostylus axostyle 1 comprises the piston 8 being located at axostylus axostyle 9 two ends, for the lower connector of connection line gold utensil, piston 8 is in spring strut 16 and be between upper spring 4 and lower spring 5, lower connector is positioned at the outside of spring strut 16,
Good stage clip, extension spring function can be reached in order to convenient disassembly, one end of described upper spring 4 contacts with the top inner wall of spring strut 16, the other end contacts with the upper surface of piston 8, one end of lower spring 5 contacts with the lower surface of piston 8, and the other end of lower spring 5 contacts with the bottom interior wall of spring strut 16;
In order to piston type axostylus axostyle 1 can be made along axis direction displacement, the passing hole place, bottom of described spring strut 16 is provided with tubular fixed shaft hole 15, and axostylus axostyle 9 is inserted in tubular fixed shaft hole 15;
In order to be connected with inter-phase spacer composite insulator fast, described upper connector comprises is located at half cylindrical shell I 2, half cylindrical shell II 3 top and pin 12 flat with the two grooved be structure as a whole, the flat pin 12 of grooved offers two screws I 13 for the bolt that spins, by bolt, spring strut 16 and inter-phase spacer composite insulator are connected as one;
In order to be connected with line hardware fast, described lower connector comprises the flat-shaped connecting pin 10 be structure as a whole with axostylus axostyle 9, and flat-shaped connecting pin 10 is provided with the screw II 11 for connecting bolt;
The decrement that the bar that described axostylus axostyle 9 is positioned at spring strut 16 outside is grown up in upper spring 4 or lower spring 5;
In order to be connected as one by half cylindrical shell I 2, half cylindrical shell II 3 fast, the short transverse both sides of described half cylindrical shell I 2, half cylindrical shell II 3 are equipped with outward extending connecting plate 17, and connecting plate 17 is provided with multiple for the screw II 14 through fastening bolt 6;
In order to prevent water inlet in spring strut 16, rubber gasket 7 is installed in the bottom of described spring strut 16.
Inter-phase spacer spring damping device of the present invention, smart structural design, is arranged on the one or both ends of inter-phase spacer during use, in conductor galloping process, when inter-phase spacer tension, lower spring will compress, and upper spring does not work, when inter-phase spacer pressurized, upper spring will compress, and lower spring does not work, therefore no matter inter-phase spacer tension or pressurized, inter-phase spacer spring damping device of the present invention consumes the energy that line oscillation produces all the time, thus reduce line oscillation amplitude, play anti-dance effect, by the perfect combination of upper spring and lower spring strain, automatically new balance is reached, stage clip function can be played, extension spring function can be played again, achieve the dual-use function of stage clip and extension spring, unstable defect is connected with other connectors when avoiding spring tension, in power industry overhead transmission line equipment technical field, there is good application prospect.
Accompanying drawing explanation
Fig. 1: the structural representation of inter-phase spacer spring damping device of the present invention;
Fig. 2: the structural representation of piston type axostylus axostyle;
The structural representation of Fig. 3: half cylindrical shell I, half cylindrical shell II;
Fig. 4: the structural representation of upper spring and lower spring.
In figure: 1, piston type axostylus axostyle, 2, half cylindrical shell I, 3, half cylindrical shell II, 4, upper spring, 5, lower spring, 6, fastening bolt, 7, rubber gasket, 8, piston, 9, axostylus axostyle, 10, flat-shaped connecting pin, 11, screw II, 12, the flat pin of grooved, 13, screw I, 14, screw II, 15, tubular fixed shaft hole, 16, spring strut, 17, connecting plate.
Embodiment
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing, be used for that the present invention is described further.
Embodiment 1: with reference to figure 1-4.This inter-phase spacer spring damping device, comprises the piston type axostylus axostyle 1 of the flat-shaped connecting pin 10 that bottom is provided with, symmetrical top is provided with half cylindrical shell I 2 and half cylindrical shell II 3, upper spring 4, lower spring 5, some fastening bolts 6 and rubber gasket 7 etc. of the flat pin of grooved 12.Wherein, half cylindrical shell I 2 and half cylindrical shell II 3 are positioned at top, piston type axostylus axostyle 1 is positioned at below, avoid into water corrosion upper spring 4 and lower spring 5, piston type axostylus axostyle 1 is by piston 8, cylinder axostylus axostyle 9, flat-shaped connecting pin 10, screw II 11 forms, half cylindrical shell I 2 and half cylindrical shell II 3 are by the flat pin 12 of grooved, screw I 13, screw II 14 and small semicircle tubular fixed shaft hole 15 form, small semicircle tubular fixed shaft hole 15 guarantees that piston type axostylus axostyle 1 with flat pin is in axis direction displacement, the decrement that the bar that axostylus axostyle 9 is positioned at spring strut 16 outside is grown up in upper spring 4 or lower spring 5, good stage clip can be reached in order to convenient disassembly, extension spring function, one end of upper spring 4 contacts with the top inner wall of spring strut 16, the other end contacts with the upper surface of piston 8, one end of lower spring 5 contacts with the lower surface of piston 8, the other end of lower spring 5 contacts with the bottom interior wall of spring strut 16, in order to be connected with inter-phase spacer composite insulator fast, upper connector comprises is located at half cylindrical shell I 2, half cylindrical shell II 3 top and pin 12 flat with the two grooved be structure as a whole, the flat pin 12 of grooved offers two screws I 13 for the bolt that spins, by bolt, spring strut 16 and inter-phase spacer composite insulator are connected as one, in order to be connected with line hardware fast, lower connector comprises the flat-shaped connecting pin 10 be structure as a whole with axostylus axostyle 9, and flat-shaped connecting pin 10 is provided with the screw II 11 for connecting bolt, in order to be connected as one by half cylindrical shell I 2, half cylindrical shell II 3 fast, the short transverse both sides of half cylindrical shell I 2, half cylindrical shell II 3 are equipped with outward extending connecting plate 17, and connecting plate 17 is provided with multiple for the screw II 14 through fastening bolt 6.
During use, first upper spring 4, piston type axostylus axostyle 1 and lower spring 5 are placed in spring strut 16 respectively, then the upper rubber gasket 7 of pad, be incorporated on half cylindrical shell I 2 with half symmetrical cylindrical shell II 3 again, form the cylindrical tube of a sealing, finally, some fastening bolts 6 are adopted half cylindrical shell I 2 of symmetry and half cylindrical shell II 3 to be tightened to one.
Apparatus of the present invention are arranged on the one or both ends of inter-phase spacer, and in conductor galloping process, when inter-phase spacer tension, lower spring 5 will compress, and upper spring 4 does not work; When inter-phase spacer pressurized, upper spring 4 will compress, and lower spring 5 does not work, therefore no matter inter-phase spacer tension or pressurized, inter-phase spacer spring damping device of the present invention consumes the energy that line oscillation produces all the time, thus reduce line oscillation amplitude, play anti-dance effect, by the perfect combination of upper spring and lower spring strain, automatically reach new balance, stage clip function can be played, extension spring function can be played again, achieve the dual-use function of stage clip and extension spring, when avoiding spring tension, be connected unstable defect with other connectors.
Protection scope of the present invention is not limited to above embodiment; such as innerspring spring strut both can be tubular; also can be designed as square, every inter-phase spacer spring damping device identical or equivalent with invention technical scheme, all belongs to protection scope of the present invention.

Claims (8)

1. an inter-phase spacer spring damping device, it is characterized in that comprising inside is placed with upper spring (4), the spring strut (16) of lower spring (5), the top of spring strut (16) is provided with the upper connector for connecting inter-phase spacer composite insulator, upper spring (4) and lower spring (5) vertical arrangement in spring strut (16), spring strut (16) is by half cylindrical shell I (2) connected, half cylindrical shell II (3) is formed, the bottom of spring strut (16) is provided with for the passing hole through piston type axostylus axostyle (1), piston type axostylus axostyle (1) comprises the piston (8) being located at axostylus axostyle (9) two ends, for the lower connector of connection line gold utensil, piston (8) is positioned at spring strut (16) and is between upper spring (4) and lower spring (5), lower connector is positioned at the outside of spring strut (16).
2. according to a kind of inter-phase spacer spring damping device according to claim 1, it is characterized in that one end of described upper spring (4) contacts with the top inner wall of spring strut (16), the other end contacts with the upper surface of piston (8), one end of lower spring (5) contacts with the lower surface of piston (8), and the other end of lower spring (5) contacts with the bottom interior wall of spring strut (16).
3., according to a kind of inter-phase spacer spring damping device according to claim 1, it is characterized in that the passing hole place, bottom of described spring strut (16) is provided with tubular fixed shaft hole (15), axostylus axostyle (9) is inserted in tubular fixed shaft hole (15).
4. according to a kind of inter-phase spacer spring damping device described in claim 1 or 2, it is characterized in that described upper connector comprise be located at half cylindrical shell I (2), half cylindrical shell II (3) top and with the flat pin of the two grooved be structure as a whole (12), the flat pin of grooved (12) offers two screws I (13) for the bolt that spins, by bolt, spring strut (16) and inter-phase spacer composite insulator are connected as one.
5. according to a kind of inter-phase spacer spring damping device described in claim 1 or 2, it is characterized in that described lower connector comprises the flat-shaped connecting pin (10) be structure as a whole with axostylus axostyle (9), flat-shaped connecting pin (10) is provided with the screw II (11) for connecting bolt.
6., according to a kind of inter-phase spacer spring damping device according to claim 1, it is characterized in that the decrement that the bar that described axostylus axostyle (9) is positioned at spring strut (16) outside is grown up in upper spring (4) or lower spring (5).
7. according to a kind of inter-phase spacer spring damping device described in claim 1 or 6, it is characterized in that the short transverse both sides of described half cylindrical shell I (2), half cylindrical shell II (3) are equipped with outward extending connecting plate (17), connecting plate (17) is provided with multiple for the screw II (14) through fastening bolt (6).
8., according to a kind of inter-phase spacer spring damping device according to claim 1, it is characterized in that rubber gasket (7) is installed in the bottom of described spring strut (16).
CN201510421740.7A 2015-07-18 2015-07-18 A kind of inter-phase spacer spring damping device Active CN104979790B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510421740.7A CN104979790B (en) 2015-07-18 2015-07-18 A kind of inter-phase spacer spring damping device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510421740.7A CN104979790B (en) 2015-07-18 2015-07-18 A kind of inter-phase spacer spring damping device

Publications (2)

Publication Number Publication Date
CN104979790A true CN104979790A (en) 2015-10-14
CN104979790B CN104979790B (en) 2017-07-18

Family

ID=54276034

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510421740.7A Active CN104979790B (en) 2015-07-18 2015-07-18 A kind of inter-phase spacer spring damping device

Country Status (1)

Country Link
CN (1) CN104979790B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106356161A (en) * 2016-10-13 2017-01-25 国家电网公司 Viscous damping shielding ring and manufacturing method thereof
CN106786297A (en) * 2017-02-21 2017-05-31 国网山东省电力公司烟台供电公司 A kind of inter-phase spacer vibrationproof anti-dance spring damping device
CN107069627A (en) * 2017-06-12 2017-08-18 国网辽宁省电力有限公司辽阳供电公司 A kind of spring Anti-galloping inter-phase spacer
CN107618403A (en) * 2017-09-18 2018-01-23 西南交通大学 A kind of dropper
CN108336709A (en) * 2018-05-16 2018-07-27 徐赵东 A kind of Anti-galloping vibration absorber of contact line or power transmission line
CN110429544A (en) * 2019-07-19 2019-11-08 国网辽宁省电力有限公司大连供电公司 Double bundle conductor anti-bouncing spacer soft connection device
CN111600261A (en) * 2020-06-29 2020-08-28 固力发电气有限公司 Pre-twisted composite alternate spacer
CN112217171A (en) * 2020-10-13 2021-01-12 陈国防 Electric power is with multidirectional separated time protector in underground

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003102124A (en) * 2001-09-25 2003-04-04 Nasu Denki Tekko Co Ltd Apparatus for holding overhead cable
CN201797285U (en) * 2010-04-19 2011-04-13 河北省电力研究院 Device for preventing vibration of power transmission line
CN102227073A (en) * 2011-03-01 2011-10-26 东北电力大学 Damping spring vibration-proof hammer
CN103490360A (en) * 2013-09-13 2014-01-01 国家电网公司 Semi-solid single-point waving prevention device
CN203589658U (en) * 2013-11-28 2014-05-07 国家电网公司 Spring damping type interphase anti-galloping spacer
CN204793962U (en) * 2015-07-18 2015-11-18 国网山东蓬莱市供电公司 Alternate conductor spacer spring damping device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003102124A (en) * 2001-09-25 2003-04-04 Nasu Denki Tekko Co Ltd Apparatus for holding overhead cable
CN201797285U (en) * 2010-04-19 2011-04-13 河北省电力研究院 Device for preventing vibration of power transmission line
CN102227073A (en) * 2011-03-01 2011-10-26 东北电力大学 Damping spring vibration-proof hammer
CN103490360A (en) * 2013-09-13 2014-01-01 国家电网公司 Semi-solid single-point waving prevention device
CN203589658U (en) * 2013-11-28 2014-05-07 国家电网公司 Spring damping type interphase anti-galloping spacer
CN204793962U (en) * 2015-07-18 2015-11-18 国网山东蓬莱市供电公司 Alternate conductor spacer spring damping device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106356161A (en) * 2016-10-13 2017-01-25 国家电网公司 Viscous damping shielding ring and manufacturing method thereof
CN106356161B (en) * 2016-10-13 2017-08-29 国家电网公司 Viscous damping formula shading ring and preparation method thereof
CN106786297A (en) * 2017-02-21 2017-05-31 国网山东省电力公司烟台供电公司 A kind of inter-phase spacer vibrationproof anti-dance spring damping device
CN106786297B (en) * 2017-02-21 2019-01-22 国网山东省电力公司烟台供电公司 A kind of inter-phase spacer vibrationproof anti-dance spring damping device
CN107069627A (en) * 2017-06-12 2017-08-18 国网辽宁省电力有限公司辽阳供电公司 A kind of spring Anti-galloping inter-phase spacer
CN107069627B (en) * 2017-06-12 2019-03-12 国网辽宁省电力有限公司辽阳供电公司 A kind of spring Anti-galloping inter-phase spacer
CN107618403A (en) * 2017-09-18 2018-01-23 西南交通大学 A kind of dropper
CN107618403B (en) * 2017-09-18 2023-07-07 西南交通大学 Integral hanger
CN108336709A (en) * 2018-05-16 2018-07-27 徐赵东 A kind of Anti-galloping vibration absorber of contact line or power transmission line
CN110429544A (en) * 2019-07-19 2019-11-08 国网辽宁省电力有限公司大连供电公司 Double bundle conductor anti-bouncing spacer soft connection device
CN111600261A (en) * 2020-06-29 2020-08-28 固力发电气有限公司 Pre-twisted composite alternate spacer
CN112217171A (en) * 2020-10-13 2021-01-12 陈国防 Electric power is with multidirectional separated time protector in underground

Also Published As

Publication number Publication date
CN104979790B (en) 2017-07-18

Similar Documents

Publication Publication Date Title
CN104979790A (en) Phase-to-phase spacer spring damping device
CN102684124B (en) Five-rod lead-waving resistant power vibration absorber for transmission lines
CN204626690U (en) The double steel tube anti-flex of Self-resetting supports
CN204243685U (en) The anti-subspan oscillation conductor spacer of a kind of damping adjusting type
CN203026883U (en) Damping rubber galloping preventing spacer
CN202004408U (en) Anti-oscillation vibration reduction damping spring conductor spacer
CN204793962U (en) Alternate conductor spacer spring damping device
CN103594997A (en) Spring shock absorption type alternate waving-preventing spacing bar
CN203026882U (en) Shape memory alloy anti-galloping spacer
CN207234355U (en) A kind of anti-freeze conductor spacer of elastic damping
CN203352101U (en) Anti-vibration system of overhead transmission lines
CN204947532U (en) A kind of inter-phase spacer dual spring damping device
CN204118660U (en) Wind-powered electricity generation electrical power transmission system
CN202917920U (en) Damping type anti-galloping device
CN204161148U (en) The anti-dancing device of electrified railway strong wind district additive wire
CN103606872A (en) Anti-corona six-bundle conductor spacer
CN204215849U (en) Dry-type air-core reactor starframe
CN208674830U (en) A kind of big damping Anti-galloping device
CN202126896U (en) Pin type ceramic insulator
CN102340119A (en) Structure for preventing flashover of power transmission circuit by windage yaw
CN203456834U (en) Multifunctional separate-type spacer
CN202384725U (en) Structure for preventing windage yaw flashover of power transmission line
CN203039319U (en) Anti-corona aluminium pipe interval rod
CN110011253B (en) Double-hanging-point adapter plate device for single-column composite insulation cross arm of power transmission line
CN204441800U (en) A kind of 500kV compact line V-type replacing insulator string jig

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant