CN109801764A - A kind of bushing class plant machinery formula blast resistance construction - Google Patents

A kind of bushing class plant machinery formula blast resistance construction Download PDF

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Publication number
CN109801764A
CN109801764A CN201910190634.0A CN201910190634A CN109801764A CN 109801764 A CN109801764 A CN 109801764A CN 201910190634 A CN201910190634 A CN 201910190634A CN 109801764 A CN109801764 A CN 109801764A
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CN
China
Prior art keywords
ontology
pressure
shielding case
release assembly
blast resistance
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CN201910190634.0A
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Chinese (zh)
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CN109801764B (en
Inventor
张静
陈浩
王柱
杨耀贤
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State Grid Corp of China SGCC
Wuhan NARI Ltd
China Electric Power Research Institute Co Ltd CEPRI
NARI Group Corp
Original Assignee
State Grid Corp of China SGCC
Wuhan NARI Ltd
China Electric Power Research Institute Co Ltd CEPRI
NARI Group Corp
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Priority to CN201910190634.0A priority Critical patent/CN109801764B/en
Publication of CN109801764A publication Critical patent/CN109801764A/en
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Publication of CN109801764B publication Critical patent/CN109801764B/en
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Abstract

The present invention relates to high-tension insulating bushing technical fields, refer specifically to a kind of bushing class plant machinery formula blast resistance construction;Ontology and conducting rod including casing, conducting rod are arranged in ontology, and dielectric is filled in the inner cavity of ontology, and the upper port of the ontology is equipped with top pressure-release assembly, and the pressure release cavity of top pressure-release assembly is connected to the inner cavity of ontology;The lower port of the ontology is equipped with bottom pressure-release assembly, and the pressure release cavity of bottom pressure-release assembly is connected to the inner cavity of ontology;The both ends of the conducting rod are arranged in top pressure-release assembly and bottom pressure-release assembly respectively;Structure of the invention is reasonable, on the basis of not changing existing set tubing apparatus body structure, carries out letting out energy using the mechanical strength endurance impact energy of material, prevents sleeve body explosion to the damaging influence of surrounding objects, reach explosion-proof function;Structure is easily installed, and is convenient for existing set tubing equipment quick-replaceable, has good engineer application and promotional value.

Description

A kind of bushing class plant machinery formula blast resistance construction
Technical field
The present invention relates to high-tension insulating bushing technical fields, refer specifically to a kind of explosion-proof knot of bushing class plant machinery formula Structure.
Background technique
Bushing explosion be cause substation occur fire one of the major reasons, although casing occur fire probability compared with It is low, but once because certain reason is on fire, irremediable ruin often is caused to associated devices (such as transformer) other in substation It is bad, or even other neighbouring electrical equipments is caused to damage.The material generallyd use inside bushing at present includes insulating oil, cardboard Deng, be combustibles, meet open fire there is a possibility that sustained combustion.Inside pipe casing insulate the moment punctured, great Liang Qi The pressure wave that body is formed will cause set pipe explosion or the rupture of sleeve bottom sealing structure, common in electrically and mechanically two aspect effects Under lead to casing heavy explosion, the huge energy of generation causes high risk fire.
For this purpose, Chinese patent CN108735438A discloses a kind of explosion-proof bushing lifting seat, it is arranged at least on increasing seat One pressure relief valve realizes the explosion prevention function of casing by detecting the unlatching of inside pipe casing pressure command pressure relief valve.In State patent CN108766683A discloses a kind of explosion-proof type electroceramics cable termination insulator, by will be adjusted to outer in insulator structure Insulating sleeve outer layer is used alumina porcelain by layer, middle layer and internal layer, and in inside pipe casing mosaic glass steel, to realize casing It is explosion-proof.Chinese patent CN106998053A discloses a kind of outdoor cable terminal protection device, by analyzing insulator outdoor terminal Breakdown and explosion point, impact force size, direction and range reach anti-in the size and structure of terminal platform periphery design baffle Quick-fried function.Although above-mentioned explosion-proof program plays certain explosion-proof effect, but keep its integrally-built surrounding enviroment more multiple It is miscellaneous, cost is increased in terms of processing and maintenance, is unfavorable for being widely applied.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In view of the defects and deficiencies of the prior art, the present invention intends to provide one kind is structurally reasonable, the processing is simple, peace Quan Xinggao, the bushing class plant machinery formula blast resistance construction convenient for popularization.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of bushing class plant machinery formula blast resistance construction of the present invention, ontology and conducting rod including casing, Conducting rod is arranged in ontology, and dielectric is filled in the inner cavity of ontology, and the upper port of the ontology is equipped with top discharge Device, the pressure release cavity of top pressure-release assembly are connected to the inner cavity of ontology;The lower port of the ontology is equipped with bottom pressure-release assembly, The pressure release cavity of bottom pressure-release assembly is connected to the inner cavity of ontology;The both ends of the conducting rod be arranged in respectively top pressure-release assembly and Bottom pressure-release assembly.
According to above scheme, the top pressure-release assembly includes hemispheric shielding case, shielding case be hollow structure and its Inner cavity constitutes pressure release cavity, and shielding case is covered in the upper port of ontology and is firmly connected with it, the dome center of shielding case upper end Equipped with through-hole, conducting rod upper end passes through through-hole and constitutes with shielding case and is tightly connected.
According to above scheme, ring heart slot is offered on the outer surface of the shielding case, ring heart slot compartment of terrain ring is located at through-hole Surrounding, several cracking slots are connected on the outside of ring heart slot, be cracked slot being arranged radially along shielding case.
According to above scheme, the lower port of the shielding case is equipped with the support plate of annular, the centre bore of support plate and logical Support tube is connected between hole, the upper end of conducting rod is arranged in the inner hole of support tube.
According to above scheme, the support plate is equipped with several over-voltage holes, and several over-voltage holes are located on the surrounding of support tube, Over-voltage hole is connected to the pressure release cavity of shielding case and the inner cavity of ontology;The upper port of the ontology be equipped with upper flange, support plate with it is upper Flange is fixedly connected, and the bottom surface of support plate is equipped with the seal groove of annular, is equipped with sealing ring in seal groove.
According to above scheme, the bottom pressure-release assembly includes the fixed underpan and parting flange of annular, under conducting rod End sequentially passes through the centre bore of fixed underpan and parting flange;The fixed underpan is fixedly connected with the lower port of ontology, fixed The periphery on chassis is equipped with support ring set, and parting flange is arranged in the lower port of support ring set, parting flange and support ring set Between be connected with fixed link;The parting flange and the setting of fixed underpan interval make the gap between the two constitute pressure release cavity, fixed Chassis is equipped with several vertically communicated passways.
According to above scheme, inner sleeve is equipped in the centre bore of the parting flange, the periphery of parting flange is equipped with outer Sleeve, the lower end of conducting rod are arranged in the inner hole of inner sleeve and are tightly connected with it;The outer sleeve is arranged in support ring set Lower port in, the outer wall of inner sleeve lower end is equipped with jack, and the inner wall of support ring set lower port is equipped with lockhole, fixed link One end is arranged in jack, and the other end of fixed link is inserted in lockhole after passing through outer sleeve.
According to above scheme, locating ring, locating ring lower port and parting flange are equipped on the bottom surface of the fixed underpan Setting is contradicted, the passway of several lateral direction penetratings is offered on locating ring.
According to above scheme, the lower port of the ontology is equipped with lower flange, and fixed underpan is fixedly connected with lower flange, Gu The upper surface for determining chassis is equipped with the seal groove of annular, is equipped with sealing ring in seal groove.
According to above scheme, the dielectric includes silicone oil and polyisobutene, and the material of sealing ring includes EP rubbers And silicon rubber.
The present invention also provides a kind of bushings, including the bushing class plant machinery formula blast resistance construction.
The invention has the following beneficial effects: structure of the invention is reasonable, on the basis for not changing existing set tubing apparatus body structure On, it carries out letting out energy using the mechanical strength endurance impact energy of material, prevents sleeve body explosion from breaking to surrounding objects Bad property influences, and reaches explosion-proof function;Structure is easily installed, and is convenient for existing set tubing equipment quick-replaceable, has good work Cheng Yingyong and promotional value.
Detailed description of the invention
Fig. 1 is integral outer structural schematic diagram of the invention;
Fig. 2 is top pressure-release assembly broken isometric viewing angle constructions schematic diagram of the invention;
Fig. 3 is bottom pressure-release assembly side the schematic diagram of the section structure of the invention.
In figure:
1, ontology;2, top pressure-release assembly;3, bottom pressure-release assembly;4, seal groove;11, conducting rod;12, dielectric; 13, upper flange;14, lower flange;21, shielding case;22, through-hole;23, ring heart slot;24, be cracked slot;25, support plate;26, it supports Pipe;27, over-voltage hole;31, fixed underpan;32, ring set is supported;33, locating ring;34, lockhole;35, parting flange;36, outer sleeve; 37, inner sleeve;38, jack;39, fixed link;41, sealing ring.
Specific embodiment
Technical solution of the present invention is illustrated with embodiment with reference to the accompanying drawing.
As shown in Figure 1, a kind of bushing class plant machinery formula blast resistance construction of the present invention, the ontology including casing 1 and conducting rod 11, conducting rod 11 be arranged in ontology 1, in the inner cavity of ontology 1 be filled with dielectric 12, the ontology 1 it is upper Port is equipped with top pressure-release assembly 2, and the pressure release cavity of top pressure-release assembly 2 is connected to the inner cavity of ontology 1;Under the ontology 1 Port is equipped with bottom pressure-release assembly 3, and the pressure release cavity of bottom pressure-release assembly 3 is connected to the inner cavity of ontology 1;The conducting rod 11 Both ends are arranged in top pressure-release assembly 2 and bottom pressure-release assembly 3 respectively;The present invention passes through the top pressure-release assembly 2 at 1 both ends of ontology Explosion Critical Degree control, when the blast pressure in casing is more than critical value, top are realized with the structural strength of bottom pressure-release assembly 3 Portion's pressure-release assembly 2 and bottom pressure-release assembly 3 deformation realize impact energy let out can, prevent sleeve body 1 explosion to surrounding objects Damaging influence reach explosion-proof function;Existing cannula structure is had no need to change, the casing of superpressure damage only needs replacing Top pressure-release assembly 2 and bottom pressure-release assembly 3, structure is easily installed, and is convenient for existing set tubing equipment quick-replaceable.
The top pressure-release assembly 2 includes hemispheric shielding case 21, and shielding case 21 is hollow structure and its inner cavity is constituted Pressure release cavity, shielding case 21 are covered in the upper port of ontology 1 and are firmly connected with it, and the dome center of 21 upper end of shielding case is equipped with Through-hole 22,11 upper end of conducting rod pass through through-hole 22 and constitute with shielding case 21 and be tightly connected;The shielding case 21 is for bearing set The explosive forces of 1 upper end of tube body, shielding case 21 bursts apart enabled when the pressure in ontology 1 is more than the mechanical strength of shielding case 21 Amount is released from 1 upper port of ontology, and then sleeve body 1 can be effectively ensured by the Material Strength of control shielding case 21 and pacifying Entirely, prevent the explosion of ontology 1 to the damaging influence of surrounding objects.
Ring heart slot 23 is offered on the outer surface of the shielding case 21,23 compartment of terrain ring of ring heart slot is located at the four of through-hole 22 Week, the outside of ring heart slot 23 are connected with several cracking slots 24, and be cracked being arranged radially along shielding case 21 of slot 24, the screen of the spherical shape Covering cover 21 can make impact energy be evenly distributed on the inner wall of shielding case 21 with the explosion impact energy of maximum area receiving from below On, 21 surface of shielding case is divided into multiple fan-shaped tortoise plastrons around ring heart slot 23 by several cracking slots 24, when bearing blast impulse, Shielding case 21 can be divided along ring heart slot 24 and cracking slot 24, to keep the response of 21 impact energy of shielding case more sensitive, together Shi Huanxin slot 23 and several cracking slots 24 control shielding case 21 in the decomposition form of explosion time, prevent flying for 21 fragment of shielding case It splashes and surrounding is had an impact.
The lower port of the shielding case 21 is equipped with the support plate 25 of annular, between the centre bore and through-hole 22 of support plate 25 It is connected with support tube 26, the upper end of conducting rod 11 is arranged in the inner hole of support tube 26;The support plate 25 and support tube 26 are used In the support construction of building shielding case 21, support plate 25 connects the lower port of shielding case 21 and is fixed in 1 upper port of ontology On, 26 upper end of support tube connection through-hole 22 links into an integrated entity with the dome of shielding case 21 in turn, when bearing blast impulse, shielding Cover 21 is divided along ring heart slot 24 and cracking slot 24, and 21 part of shielding case in 24 region of ring heart slot connect with support tube 26 and will not fly It splashes, and 21 part of shielding case outside 24 region of ring heart slot is connected to along the division of cracking slot 24 but still in support plate 25, thus anti- Only whole decompose of shielding case 21 generates bomb fragments influence peripheral equipment.
The support plate 25 is equipped with several over-voltage holes 27, and several over-voltage holes 27 are located on the surrounding of support tube 26, over-voltage Hole 27 is connected to the pressure release cavity of shielding case 21 and the inner cavity of ontology 1;The upper port of the ontology 1 is equipped with upper flange 13, support plate 25 are fixedly connected with upper flange 13, and the bottom surface of support plate 25 is equipped with the seal groove 4 of annular, are equipped with sealing ring 41 in seal groove 4; The upper flange 13 is existing sleeve pipe structure, and replacing structure of the support plate 25 as existing blind flange connects shielding case 21 Onto 1 upper port of ontology, repacking is very convenient, while support plate 25 is transmitted to the pressure in ontology 1 by over-voltage hole 27 On shielding case 21, the joint face between support plate 25 and upper flange 13 realizes sealing by sealing ring 41.
As shown in figure 3, the bottom pressure-release assembly 3 includes the fixed underpan 31 and parting flange 35 of annular, conducting rod 11 Lower end sequentially pass through the centre bore of fixed underpan 31 and parting flange 35;The lower port of the fixed underpan 31 and ontology 1 is solid Fixed connection, the periphery of fixed underpan 31 are equipped with support ring set 32, and parting flange 35 is arranged in the lower port of support ring set 32, Fixed link 39 is connected between parting flange 35 and support ring set 32;The parting flange 35 makes with the setting of the interval of fixed underpan 31 Gap between the two constitutes pressure release cavity, and fixed underpan 31 is equipped with several vertically communicated passways;31 He of fixed underpan It is connected between parting flange 35 by support ring set 32, pressure release cavity is between three, and passway is by pressure release cavity and 1 inner cavity of ontology Connection, so that the pressure in ontology 1 is allow to be conducted to parting flange 35, when the blast pressure postcritical in ontology 1, Parting flange 35 and support ring set 32 between fixed link 39 generate deformation, thus disconnect parting flange 35 and support ring set 32 it Between connection, parting flange 35, which is detached from support ring set 32, releases the pressure in pressure release cavity, and then prevents 1 internal pressure of ontology from crossing high yield Raw explosion impacts external equipment.
Inner sleeve 37 is equipped in the centre bore of the parting flange 35, the periphery of parting flange 35 is equipped with outer sleeve 36, The lower end of conducting rod 11 is arranged in the inner hole of inner sleeve 37 and is tightly connected with it;The outer sleeve 36 is arranged in support ring set In 32 lower port, the outer wall of 37 lower end of inner sleeve is equipped with jack 38, and the inner wall of support 32 lower port of ring set is equipped with lockhole 34, one end of fixed link 39 is arranged in jack 38, and the other end of fixed link 39 is inserted in lockhole 34 after passing through outer sleeve 36; For the inner sleeve 37 for assembling conducting rod 11 and constituting sealing cooperation between the two, sealing cooperation can be used mechanical engagement sealing It is realized with sealing element mode;Explosion energy in the ontology 1 passes to parting flange 35 from passway, and pressure is in outer sleeve 36 Shearing force is generated between support ring set 32, which makes fixed link 39 generate deformation, to make its outer end from lockhole 34 Abjection, therefore, the critical value of bottom pressure-release assembly 3 is the compression strength of fixed link 39, passes through the diameter ruler to fixed link 39 The very little and strength of materials is measured, and can be effectively ensured when there is explosive event in ontology 1, fixed link 39 can preferential deformation make point It is detached from from flange 35, so that impact energy be made to release from 1 lower port of ontology, guarantees that ontology 1 will not occur decomposing situation because of explosion, It avoids having an impact external device.
Locating ring 33 is equipped on the bottom surface of the fixed underpan 31,33 lower port of locating ring is set with the conflict of parting flange 35 It sets, the passway of several lateral direction penetratings is offered on locating ring 33, the locating ring 33 positions it from 35 inside of parting flange, Fixed link 39 is set to be directed at lockhole 34.
The lower port of the ontology 1 is equipped with lower flange 14, and fixed underpan 31 is fixedly connected with lower flange 14, fixed underpan 31 upper surface is equipped with the seal groove 4 of annular, is equipped with sealing ring 41 in seal groove 4;The lower flange 14 is existing casing knot Structure replaces existing blind flange by fixed underpan 31, and the lower port that parting flange 35 is installed to ontology 1 is constructed pressure release cavity, Guarantee the leakproofness of pressure release cavity by seal groove 4 and sealing ring 41, and then is answered by the explosion of the deformation strength control of fixed link 39 Power critical point guarantees that ontology 1 will not generate decomposition situation in explosion time.
The dielectric 12 includes silicone oil and polyisobutene, and the material of sealing ring 41 includes EP rubbers and silicon rubber, The material of the dielectric 12 and sealing ring 41 is corresponding relationship, when the dielectric 12 of inside pipe casing is silicone oil, be can be selected When inside pipe casing dielectric 12 is polyisobutene, silicon rubber is can be selected as close in material of the EP rubbers as sealing ring 41 The material of seal 41.
The present invention also provides a kind of bushings, including the bushing class plant machinery formula blast resistance construction.
The above description is only a preferred embodiment of the present invention, thus it is all according to the configuration described in the scope of the patent application of the present invention, The equivalent change or modification that feature and principle are done, is included in the scope of the patent application of the present invention.

Claims (11)

1. a kind of bushing class plant machinery formula blast resistance construction, ontology (1) and conducting rod (11) including casing, conducting rod (11) it is arranged in ontology (1), is filled with dielectric (12) in the inner cavity of ontology (1), it is characterised in that: the ontology (1) Upper port be equipped with top pressure-release assembly (2), the pressure release cavity of top pressure-release assembly (2) is connected to the inner cavity of ontology (1);It is described The lower port of ontology (1) is equipped with bottom pressure-release assembly (3), and the pressure release cavity of bottom pressure-release assembly (3) and the inner cavity of ontology (1) connect It is logical;The both ends of the conducting rod (11) are arranged in top pressure-release assembly (2) and bottom pressure-release assembly (3) respectively.
2. bushing class plant machinery formula blast resistance construction according to claim 1, it is characterised in that: the top discharge Device (2) includes hemispheric shielding case (21), and shielding case (21) is hollow structure and its inner cavity constitutes pressure release cavity, shielding case (21) it covers in the upper port of ontology (1) and is firmly connected with it, the dome center of shielding case (21) upper end is equipped with through-hole (22), conducting rod (11) upper end passes through through-hole (22) and constitutes with shielding case (21) and is tightly connected.
3. bushing class plant machinery formula blast resistance construction according to claim 2, it is characterised in that: the shielding case (21) it is offered on outer surface ring heart slot (23), ring heart slot (23) compartment of terrain ring is located at the surrounding of through-hole (22), ring heart slot (23) several cracking slots (24) are connected on the outside of, be cracked slot (24) being arranged radially along shielding case (21).
4. bushing class plant machinery formula blast resistance construction according to claim 2, it is characterised in that: the shielding case (21) lower port is equipped with the support plate (25) of annular, is connected with support between the centre bore and through-hole (22) of support plate (25) It manages (26), the upper end of conducting rod (11) is arranged in the inner hole of support tube (26).
5. bushing class plant machinery formula blast resistance construction according to claim 4, it is characterised in that: the support plate (25) several over-voltage holes (27) are equipped with, several over-voltage holes (27) are located on the surrounding of support tube (26), over-voltage hole (27) connection The pressure release cavity of shielding case (21) and the inner cavity of ontology (1);The upper port of the ontology (1) is equipped with upper flange (13), support plate (25) it is fixedly connected with upper flange (13), the bottom surface of support plate (25) is equipped with the seal groove (4) of annular, sets in seal groove (4) There are sealing ring (41).
6. bushing class plant machinery formula blast resistance construction according to claim 1, it is characterised in that: the bottom discharge Device (3) includes the fixed underpan (31) and parting flange (35) of annular, and the lower end of conducting rod (11) sequentially passes through fixed underpan (31) and the centre bore of parting flange (35);The fixed underpan (31) is fixedly connected with the lower port of ontology (1), fixed underpan (31) periphery is equipped with support ring set (32), and parting flange (35) is arranged in the lower port of support ring set (32), partition method Fixed link (39) are connected between blue (35) and support ring set (32);The parting flange (35) sets with fixed underpan (31) interval It sets the gap between making the two and constitutes pressure release cavity, fixed underpan (31) is equipped with several vertically communicated passways.
7. bushing class plant machinery formula blast resistance construction according to claim 6, it is characterised in that: the parting flange (35) inner sleeve (37) are equipped in centre bore, the periphery of parting flange (35) is equipped with outer sleeve (36), conducting rod (11) Lower end is arranged in the inner hole of inner sleeve (37) and is tightly connected with it;The outer sleeve (36) is arranged in support ring set (32) In lower port, the outer wall of inner sleeve (37) lower end is equipped with jack (38), and the inner wall of support ring set (32) lower port is equipped with lock Hole (34), one end of fixed link (39) are arranged in jack (38), and the other end of fixed link (39) passes through outer sleeve (36) and inserts afterwards In lockhole (34).
8. bushing class plant machinery formula blast resistance construction according to claim 7, it is characterised in that: the fixed underpan (31) it is equipped on bottom surface locating ring (33), locating ring (33) lower port and parting flange (35) contradict and are arranged, locating ring (33) passway of several lateral direction penetratings is offered on.
9. bushing class plant machinery formula blast resistance construction according to claim 7, it is characterised in that: the ontology (1) Lower port be equipped with lower flange (14), fixed underpan (31) is fixedly connected with lower flange (14), the upper end of fixed underpan (31) Face is equipped with the seal groove (4) of annular, is equipped with sealing ring (41) in seal groove (4).
10. bushing class plant machinery formula blast resistance construction according to claim 9, it is characterised in that: the insulation is situated between Matter (12) includes silicone oil and polyisobutene, and the material of sealing ring (41) includes EP rubbers and silicon rubber.
11. a kind of bushing, it is characterised in that: including bushing class equipment machine described in claim 1-10 any one Tool formula blast resistance construction.
CN201910190634.0A 2019-03-13 2019-03-13 Mechanical explosion-proof structure of high-voltage sleeve equipment Active CN109801764B (en)

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CN201910190634.0A CN109801764B (en) 2019-03-13 2019-03-13 Mechanical explosion-proof structure of high-voltage sleeve equipment

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Application Number Priority Date Filing Date Title
CN201910190634.0A CN109801764B (en) 2019-03-13 2019-03-13 Mechanical explosion-proof structure of high-voltage sleeve equipment

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CN109801764B CN109801764B (en) 2024-03-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113241718A (en) * 2021-05-28 2021-08-10 长园电力技术有限公司 Cable intermediate head

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201590643U (en) * 2009-12-25 2010-09-22 江苏安靠超高压电缆附件有限公司 Explosion-proof cable outdoor terminal
US20180269639A1 (en) * 2014-10-01 2018-09-20 Ormazabal Protection & Automation, S.L.U. Insulated High-Voltage Adapter
CN209544041U (en) * 2019-03-13 2019-10-25 国网电力科学研究院武汉南瑞有限责任公司 A kind of bushing class plant machinery formula blast resistance construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201590643U (en) * 2009-12-25 2010-09-22 江苏安靠超高压电缆附件有限公司 Explosion-proof cable outdoor terminal
US20180269639A1 (en) * 2014-10-01 2018-09-20 Ormazabal Protection & Automation, S.L.U. Insulated High-Voltage Adapter
CN209544041U (en) * 2019-03-13 2019-10-25 国网电力科学研究院武汉南瑞有限责任公司 A kind of bushing class plant machinery formula blast resistance construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113241718A (en) * 2021-05-28 2021-08-10 长园电力技术有限公司 Cable intermediate head
CN113241718B (en) * 2021-05-28 2022-02-15 长园电力技术有限公司 Cable intermediate head

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