CN109488101A - A kind of Gao Nailei level insulation cross-arm for 10kV power distribution network - Google Patents
A kind of Gao Nailei level insulation cross-arm for 10kV power distribution network Download PDFInfo
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- CN109488101A CN109488101A CN201811434477.5A CN201811434477A CN109488101A CN 109488101 A CN109488101 A CN 109488101A CN 201811434477 A CN201811434477 A CN 201811434477A CN 109488101 A CN109488101 A CN 109488101A
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- arm
- card slot
- distribution network
- power distribution
- nailei
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- 238000009413 insulation Methods 0.000 title claims abstract description 25
- 238000009826 distribution Methods 0.000 title claims abstract description 23
- 239000012212 insulator Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims abstract description 5
- 239000004593 Epoxy Substances 0.000 claims abstract description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 4
- 229940106691 bisphenol a Drugs 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims description 18
- 238000012937 correction Methods 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000009422 external insulation Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 claims 1
- 208000025274 Lightning injury Diseases 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 abstract description 2
- 239000012779 reinforcing material Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229920002379 silicone rubber Polymers 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 244000080575 Oxalis tetraphylla Species 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Insulators (AREA)
Abstract
The present invention provides a kind of Gao Nailei level insulation cross-arms for 10kV power distribution network, including inner core, plug, full skirt and surface covering and metal connecting piece；Inner core uses polyurethane foam material, inside foam filling plug；Plug is using the higher bisphenol-A epoxy of intensity as resin matrix, and E glass is as reinforcing material；The HCEP series plastics of full skirt material selection HUNTSMAN company, using automatic pressure gel APG moulding process；Surface covering uses fluorocarbon coating；Lightning impulse withstand voltage is not less than 350kV, and 1000m or less height above sea level creepage distance is not less than 750mm.The present invention selects more reasonable insulating materials, it is intended to insulator crossarm are directly modified to the umbrella skirt construction with some strength and good function, improve the safety of route；In addition, the present invention effectively solves the problems, such as power distribution network lightning stroke trip and insulated conductor breakage caused by lightning stroke by the height above sea level amendment of Insulation Coordination.
Description
Technical field
The invention belongs to power grid construction technical field, in particular to a kind of Gao Nailei level insulation for 10kV power distribution network
Cross-arm.
Background technique
Cross-arm is the common fitting of distribution network, is mainly used for support insulator, controller switching equipment on conducting wire and column, guarantees to lead
Enough safe distances between line.In recent years, with the fast development of distribution network live line work, the continuous improvement of technical level, operation
The deployable electrification project of personnel is also more and more, many all comprising electrification installation or replacement this step of cross-arm in these projects
Suddenly.Currently, cross-arm used in many local distribution networks is mainly iron cross arm, operating personnel relies primarily on hand in actual operation
Arm strength amount is supported cross-arm, and the factors such as electric pole type, line span, erection mode are but also operating personnel needs to have
It is standby that different sizes, the physical fitness and technical capability of the single, double cross-arm of different type are installed, while distribution network live line work personnel are pacifying
When dress or disassembly cross-arm, since job area is limited, cross-arm is easy to shake in installation, disassembly process, leads to cross-arm and adjacent belts
The safe distance of electric body is insufficient, increases operating risk.
In this research field, the country has been developed for multiple product, such as silicon rubber cross-arm, porcelain pole arm, i.e., certain
Silicon rubber or ceramic full skirt are set on the composite material plug of length, increases insulation distance, forms a complete insulator crossarm.
But this 2 kinds of insulator crossarms have deficiency, and silicon rubber insulation cross-arm has full skirt mechanical strength low, and can not stand people, invade vulnerable to worm bird
The disadvantages of disturbing；The shortcomings that ceramic insulation cross-arm has mechanical strength low, easy to damage or fracture.With composite material exploitation and answer
With, purposes of the composite material in transmission facility is more and more wider, especially fiber-reinforced polymer with good insulation performance and
Mechanical performance is widely deployed on transmission line insulator cross-arm.With technology, resin formula, fibre property, protection
The improvement of measure, composite material ageing properties are also improved with economy.
Summary of the invention
The present invention selects more reasonable insulating materials, it is intended to directly insulator crossarm is modified to some strength and good
The umbrella skirt construction of good function, improves the safety of route；In addition, the present invention is effectively solved by the height above sea level amendment of Insulation Coordination
Power distribution network lightning stroke trip and insulated conductor breakage caused by lightning stroke problem.
The present invention is specially a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network, and the insulator crossarm includes interior
Core, plug, full skirt and surface covering and metal connecting piece；Inner core uses polyurethane foam material, inside foam filling plug；
Plug is the main load component of whole cross-arm, and using the higher bisphenol-A epoxy of intensity as resin matrix, E glass is as increasing
Strong material, the moulding process of profile are pull-winding technique；The main function of full skirt is to increase creep distance, guarantees the outer exhausted of cross-arm
Edge is horizontal, to reach the functional requirement of substitution insulator；The HCEP series plastics of full skirt material selection HUNTSMAN company, are adopted
With automatic pressure gel APG moulding process；Surface covering use fluorocarbon coating, effect be further increase cross-arm surface hydrophobic,
Weather-proof function；Metal connecting piece effect in both ends is is separately connected tower body and hanging wire fitting, for conventional galvanized part；The insulator crossarm
Lightning impulse withstand voltage be not less than 350kV, 1000m or less height above sea level creepage distance is not less than 750mm.
Further, the insulator crossarm dry arcing distance is modified with height above sea level, and altitude correction factor formula isIn formula, H2 is insulator crossarm infield height above sea level；H1 is insulator crossarm test site height above sea level；M is
Height above sea level modifying factor, power frequency, lightning voltage take 1, and switching overvoltage takes 0.75.
Further, in height above sea level≤1000m, altitude correction factor k=1, dry arcing distance >=600mm；In 1000m
When < height above sea level≤2000m, altitude correction factor k=1.131, dry arcing distance >=680mm；2000m < height above sea level≤
When 3000m, altitude correction factor k=1.278, dry arcing distance >=770mm；In 3000m < height above sea level≤4000m, height above sea level
Correction factor k=1.445, dry arcing distance >=870mm.
Further, the insulator crossarm further includes a support frame, and support frame as described above is using epoxy resin as basic
Material.
Further, the connection card slot of support frame as described above uses embedded card slot: one precision of design is higher, is bonded bucket arm
The clamp groove component of car bucket, when use, are directly inserted into internal conflict edge, complete installation.
Further, the connection card slot of support frame as described above uses left-hand thread absorption type card slot: one insertion card slot of design, and
Card slot wood low side installs a left-hand thread component, when use by bracket be inserted into headwall, then by left-hand thread component left-hand thread in interior headwall from
And fixed card slot, when being not used, the absorption of left-hand thread component is packed up.
Further, the connection card slot of support frame as described above confines formula card slot using bolt: one insertion card slot of design, and
Card slot wood low side installs a bolt member, when use by bracket be inserted into headwall, then bolt is tightened in interior headwall to solid
Determine card slot；When being not used, derotation bolt is packed up.
Further, the load strut of support frame as described above uses fixed inclined support structure: one fixed diagonal brace of design makes
Triangle must be integrally formed.
Further, the load strut of support frame as described above uses the collapsible inclined support structure in middle part: one diagonal brace of design, intermediate
Position is openable, passes through pin when use and links.
Further, the load strut of support frame as described above uses the collapsible inclined support structure in end: one diagonal brace of design, end
It is openable, pass through pin when use and links.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of insulator crossarm of the present invention；
Fig. 2 is the structural schematic diagram of the embedded card slot of insulator crossarm of the present invention；
Fig. 3 is the structural schematic diagram of insulator crossarm left-hand thread absorption type card slot of the present invention；
Fig. 4 is the structural schematic diagram that insulator crossarm bolt of the present invention confines formula card slot.
Specific embodiment
With reference to the accompanying drawing to a kind of specific implementation of the Gao Nailei level insulation cross-arm for 10kV power distribution network of the present invention
Mode elaborates.
10kV distribution insulator crossarm of the present invention includes inner core, plug, full skirt and surface covering and metal connecting piece, such as Fig. 1
It is shown.Inner core uses polyurethane foam material, inside foam filling plug, had both prevented internal infiltration, and had improved interior insulation level,
Cross-arm total quality is not increased again；Using traditional manual foam process.
Plug is the main load component of whole cross-arm, therefore more demanding to the mechanical property of materials.It is higher using intensity
Bisphenol-A epoxy as resin matrix, E glass can satisfy intensity requirement as reinforcing material；The moulding process of profile is to draw
Squeeze-winding process.Pultrusion is capable of the profile of continuous production interface complexity, while can guarantee in profile have higher fiber to contain
Amount；It is Wrapping formed, it can increase the bending resistance of material, antitorque and anti-cracking performance.
The main function of full skirt is to increase creep distance, guarantees that the external insulation of cross-arm is horizontal, to reach the function of substitution insulator
It can require；The HCEP series plastics of full skirt material selection HUNTSMAN company, the resin have good electrical property, mechanicalness
Energy, weatherability and hydrophobicity.Using automatic pressure gel APG moulding process；APG technology can shorten cure cycle, by routine
5~6h foreshorten to 20~30min, moreover it is possible to make the cure shrinkage of epoxy resin be reduced to 0.25% from 1%~3%~
0.45%, the compactness of finished product structure is greatly improved, its insulation performance, mechanical strength etc. are improved.
Surface covering uses fluorocarbon coating, and effect is to further increase cross-arm surface hydrophobic, weather-proof function；Both ends metal connects
Fitting effect is is separately connected tower body and hanging wire fitting, for conventional galvanized part.
The lightning impulse withstand voltage of the insulator crossarm is not less than 350kV, and 1000m or less height above sea level creepage distance is not small
In
750mm.The insulator crossarm dry arcing distance is modified with height above sea level, and altitude correction factor formula isIn formula, H2 is insulator crossarm infield height above sea level；H1 is insulator crossarm test site height above sea level；M is
Height above sea level modifying factor, power frequency, lightning voltage take 1, and switching overvoltage takes 0.75.In height above sea level≤1000m, height above sea level amendment system
Number k=1, dry arcing distance >=600mm；In 1000m < height above sea level≤2000m, altitude correction factor k=1.131, dry arc distance
From >=680mm；In 2000m < height above sea level≤3000m, altitude correction factor k=1.278, dry arcing distance >=770mm；?
When 3000m < height above sea level≤4000m, altitude correction factor k=1.445, dry arcing distance >=870mm.
The insulator crossarm further includes a support frame, and support frame as described above is using epoxy resin as basic material.
As shown in Fig. 2, the connection card slot of support frame as described above uses embedded card slot: one precision of design is higher, fitting bucket
The clamp groove component of arm car bucket, when use, are directly inserted into internal conflict edge, complete installation.
As shown in figure 3, the connection card slot of support frame as described above uses left-hand thread absorption type card slot: one insertion card slot of design, and
Bracket is inserted into interior headwall in card slot wood low side one left-hand thread component of installation, use, then by left-hand thread component left-hand thread in interior headwall
To fixed card slot, when being not used, the absorption of left-hand thread component is packed up.
As shown in figure 4, the connection card slot of support frame as described above confines formula card slot using bolt: one insertion card slot of design, and
One bolt member is installed in card slot wood low side, when use by bracket be inserted into headwall, then by bolt be tightened in interior headwall to
Fixed card slot；When being not used, derotation bolt is packed up.
Further, the load strut of support frame as described above uses fixed inclined support structure: one fixed diagonal brace of design makes
Triangle must be integrally formed.
Further, the load strut of support frame as described above uses the collapsible inclined support structure in middle part: one diagonal brace of design, intermediate
Position is openable, passes through pin when use and links.
Further, the load strut of support frame as described above uses the collapsible inclined support structure in end: one diagonal brace of design, end
It is openable, pass through pin when use and links.
Finally it should be noted that only illustrating technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair a specific embodiment of the invention
Change or equivalent replacement, but these modifications or change are being applied among pending claims.
Claims (10)
1. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network, which is characterized in that the insulator crossarm include inner core,
Plug, full skirt and surface covering and metal connecting piece；Inner core uses polyurethane foam material, inside foam filling plug；Core
Stick is the main load component of whole cross-arm, and using the higher bisphenol-A epoxy of intensity as resin matrix, E glass is as enhancing
Material, the moulding process of profile are pull-winding technique；The main function of full skirt is to increase creep distance, guarantees the external insulation of cross-arm
Level, to reach the functional requirement of substitution insulator；The HCEP series plastics of full skirt material selection HUNTSMAN company use
Automatic pressure gel APG moulding process；Surface covering uses fluorocarbon coating, and effect is to further increase cross-arm surface hydrophobic, resistance to
Wait function；Metal connecting piece effect in both ends is is separately connected tower body and hanging wire fitting, for conventional galvanized part；The insulator crossarm
Lightning impulse withstand voltage is not less than 350kV, and 1000m or less height above sea level creepage distance is not less than 750mm.
2. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 1, which is characterized in that institute
Insulator crossarm dry arcing distance is stated as height above sea level is modified, altitude correction factor formula isIn formula, H2For insulation
Cross-arm infield height above sea level；H1For insulator crossarm test site height above sea level；M is height above sea level modifying factor, power frequency, thunder and lightning electricity
Pressure takes 1, and switching overvoltage takes 0.75.
3. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 2, which is characterized in that
When height above sea level≤1000m, altitude correction factor k=1, dry arcing distance >=600mm；In 1000m < height above sea level≤2000m
When, altitude correction factor k=1.131, dry arcing distance >=680mm；In 2000m < height above sea level≤3000m, height above sea level amendment system
Number k=1.278, dry arcing distance >=770mm；In 3000m < height above sea level≤4000m, altitude correction factor k=1.445 is done
Arc distance is from >=870mm.
4. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 3, which is characterized in that institute
Stating insulator crossarm further includes a support frame, and support frame as described above is using epoxy resin as basic material.
5. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that institute
The connection card slot of support frame is stated using embedded card slot: one precision of design is higher, and the clamp groove component that fitting bucket arm vehicle is conflicted internally makes
Used time is directly inserted into internal conflict edge, completes installation.
6. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that institute
The connection card slot of support frame is stated using left-hand thread absorption type card slot: one insertion card slot of design, and one is installed in card slot wood low side
Left-hand thread component, when use by bracket be inserted into headwall, then by left-hand thread component left-hand thread in interior headwall to fixed card slot, be not used
When, the absorption of left-hand thread component is packed up.
7. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that institute
The connection card slot for stating support frame confines formula card slot using bolt: one insertion card slot of design, and installs one in card slot wood low side
Bolt member, when use by bracket be inserted into headwall, then bolt is tightened in interior headwall to fixed card slot；When being not used, instead
Rotation bolt is packed up.
8. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that institute
The load strut of support frame is stated using fixed inclined support structure: one fixed diagonal brace of design makes that triangle is integrally formed.
9. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that institute
The load strut for stating support frame uses the collapsible inclined support structure in middle part: one diagonal brace of design, intermediate position is openable, and when use is logical
Cross pin link.
10. a kind of Gao Nailei level insulation cross-arm for 10kV power distribution network according to claim 4, which is characterized in that
The load strut of support frame as described above uses the collapsible inclined support structure in end: one diagonal brace of design, end is openable, and when use passes through
Pin link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811434477.5A CN109488101A (en) | 2018-11-28 | 2018-11-28 | A kind of Gao Nailei level insulation cross-arm for 10kV power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811434477.5A CN109488101A (en) | 2018-11-28 | 2018-11-28 | A kind of Gao Nailei level insulation cross-arm for 10kV power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109488101A true CN109488101A (en) | 2019-03-19 |
Family
ID=65698040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811434477.5A Pending CN109488101A (en) | 2018-11-28 | 2018-11-28 | A kind of Gao Nailei level insulation cross-arm for 10kV power distribution network |
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| Country | Link |
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| CN (1) | CN109488101A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017052A (en) * | 2019-04-30 | 2019-07-16 | 河北盛达电力器材有限公司 | A kind of compound cross-arm |
| CN112018696A (en) * | 2020-08-26 | 2020-12-01 | 国网上海市电力公司 | 10kV insulated conductor line trip protection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280276A (en) * | 2013-05-24 | 2013-09-04 | 国家电网公司 | Composite cross arm and manufacturing process thereof |
| CN105427969A (en) * | 2015-12-28 | 2016-03-23 | 南京电气高压套管有限公司 | Hollow paste-injected post insulator employing vacuum impregnated fiber |
| CN106320797A (en) * | 2016-08-25 | 2017-01-11 | 陕西泰普瑞电工绝缘技术有限公司 | Hard umbrella skirt composite insulated cross arm for use at high voltage and manufacturing device and method thereof |
| CN208122459U (en) * | 2018-03-08 | 2018-11-20 | 廊坊北熔电气股份有限公司 | A kind of circular rod type lightning protection insulator crossarm |
-
2018
- 2018-11-28 CN CN201811434477.5A patent/CN109488101A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280276A (en) * | 2013-05-24 | 2013-09-04 | 国家电网公司 | Composite cross arm and manufacturing process thereof |
| CN105427969A (en) * | 2015-12-28 | 2016-03-23 | 南京电气高压套管有限公司 | Hollow paste-injected post insulator employing vacuum impregnated fiber |
| CN106320797A (en) * | 2016-08-25 | 2017-01-11 | 陕西泰普瑞电工绝缘技术有限公司 | Hard umbrella skirt composite insulated cross arm for use at high voltage and manufacturing device and method thereof |
| CN208122459U (en) * | 2018-03-08 | 2018-11-20 | 廊坊北熔电气股份有限公司 | A kind of circular rod type lightning protection insulator crossarm |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017052A (en) * | 2019-04-30 | 2019-07-16 | 河北盛达电力器材有限公司 | A kind of compound cross-arm |
| CN112018696A (en) * | 2020-08-26 | 2020-12-01 | 国网上海市电力公司 | 10kV insulated conductor line trip protection method |
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Application publication date: 20190319 |
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