CN1480960A - Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike - Google Patents
Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike Download PDFInfo
- Publication number
- CN1480960A CN1480960A CNA031200052A CN03120005A CN1480960A CN 1480960 A CN1480960 A CN 1480960A CN A031200052 A CNA031200052 A CN A031200052A CN 03120005 A CN03120005 A CN 03120005A CN 1480960 A CN1480960 A CN 1480960A
- Authority
- CN
- China
- Prior art keywords
- punctured
- embedded insulator
- gold utensil
- insulator
- insulation
- 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
Links
Images
Landscapes
- Insulators (AREA)
Abstract
The insulator includes arc proof insulator, punctured anchor clamp, insulated conductor, and insulated flexible conductor. The arc proof insulator is utilized to position path of lightning flash over and fix cauterization point of power frequency electric arc. The punctured anchor clamp penetrating insulation layer of insulated conductor is contacts to conductor inside tightly. The insulated flexible conductor connects arc proof insulator with punctured anchor clamp electrically. Thus, when thunder and lightning takes place, discharging happens through arc proof insulator. The invention features no wire to be peeled off, preventing broken wire caused by lightning strike, high safety, easy to implement.
Description
Technical field
The present invention relates to the electric power system overhead distribution, relate in particular to a kind of punctured and embedded insulator that is used to prevent the suspended insulated guide wire lightning-caused breaking, it is applicable to the suspended insulated guide wire of various Setup Types.
Background technology
In order to reduce the overhead distribution fault that external causes such as trees, birds, accumulated snow cause, improve power supply reliability, developed country gradually adopts suspended insulated guide wire from the later stage in the sixties in the world.China begins that from the eighties city overhead distribution net is implemented insulating and transforms pilot.The nineties begins to apply.
Insulated conductor has solved corridor that plain conductor can't resolve and safety problem really, compares with cable, reduced investment, builds soon, and advantage is fairly obvious.But the lightning-caused breaking problem is but very outstanding.Japan reaches a conclusion in the research of early seventies: the insulated conductor thunderbolt must be broken.For example: 1998, lightening activity was strong, the 10kV insulated overhead line generation lightning-caused breaking of Beijing Power Supply Bureau's administration 14 times.Therefore, the lightning-caused breaking problem must be properly settled, the safe operation of overhead insulating power distribution network could be guaranteed.
The lightning-caused breaking principle of insulated conductor has been compared obviously different with plain conductor.When direct lightning strike or lightning induced voltage acted on plain conductor and cause insulator arc-over, the power frequency short circuit current electric arc that continues moved to deviating from the power supply direction along lead under electrodynamic effect, and lead is very little by the probability of serious burn.Insulated conductor is then different, lightning overvoltage at first punctures wire insulation and then causes insulator arc-over, breakdown insulating barrier is a pin hole shape, the power frequency short circuit current electric arc that continues is subjected to the anti-coagulating action that insulate on every side, the arc root can only will fitly be blown at extremely short time inside conductor in the burning of pin hole place.
According to the mechanism of above-mentioned insulated conductor lightning-caused breaking, the corresponding precautionary measures have " dredge and stop up " dual mode." dredging " is exactly with near the local bare wireization of the insulated conductor the insulator, make power frequency arc arc root shift or be fixed on the special gold utensil and burn, thereby guardwire avoids burn.For example, peeling off insulating barrier at insulator and wire coupling place adopts arc protection molded lines folder or the insulated conductor of insulator both sides is peeled off one section insulating barrier and installed preventing arc wire clamp etc. additional." obstruction " is exactly to stop the power frequency continued flow starting the arc behind the lightning stroke flashover.For example, adopt the current-limiting arc-extinguishing angle, i.e. the ring-like external series gap metal oxide arrester of band series connection.
Though above-mentioned dual mode can prevent lightning-caused breaking effectively, there is following deficiency:
1. present existing arc-preventing metal utensil, in use, insulated conductor need be peeled off long length, and exposed part is bigger, and this can have certain influence to the sealing and the insulation of lead.
2. use lightning arrester, though protection effect is good, construction and installation complexity, investment are big.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of punctured and embedded insulator that is used to prevent the suspended insulated guide wire lightning-caused breaking that overcomes the new structure of above-mentioned defective of the prior art.
To achieve these goals, of the present inventionly be used to prevent that the punctured and embedded insulator of suspended insulated guide wire lightning-caused breaking from comprising: arc resistance insulation, be installed on the described suspended insulated guide wire, be used to locate the lightning flash over path and fixedly power frequency arc burn a little; The puncture gold utensil, the insulating barrier and the conductor inside that penetrate insulated conductor closely electrically contact; Insulating soft wire is used to electrically connect arc resistance insulation and puncture gold utensil, makes when thunder and lightning takes place, by the arc resistance insulation electron discharge.
Punctured and embedded insulator of the present invention has anti-lightning strike broken string, does not peel off wire insulation, construction is simple, subsidiary insulation protective hood, security reliability height, fill up characteristics such as domestic technique blank.Particularly, it has the following advantages: (1) because puncture gold utensil of the present invention penetrates the insulating barrier of insulated conductor, with the plain conductor close-coupled of inside, the high-field electrode of arc resistance insulation is identical with puncture gold utensil current potential by insulating soft wire.After the thunder discharge, the arc root of the power frequency short circuit current electric arc that continues is fixed on the high-field electrode of arc resistance insulation and burns, thereby guardwire avoids burn.(2) the present invention uses the puncture gold utensil, need not to peel off insulating barrier, can draw high-voltage.The puncture cutter tooth is clamp-oned insulating barrier in the mode of a pressure, and is very little to the wire insulation damage.Stab knife tooth surface coating electrically conductive silicone grease can prevent that moisture from entering lead inside.(3) the high-field electrode thickness of arc resistance insulation is bigger, stands multiplex's burning of electric arc frequently.(4) adopt the torsion nut, make the degree of depth of puncture reasonable, can well contact, can not influence the intensity and the performance of insulated conductor again with insulated conductor.(5) adopted the structure of optimal design, insulating soft wire has been reserved enough length, when overhead transmission line is subjected to displacement, can operate as normal, and the security reliability height.(6) arc resistance insulation is quick and easy for installation, satisfies the action need of job site.(7) mechanical performance of arc resistance insulation, the insulation property of insulation protective hood, antifouling property and weather protection ageing properties are good.
Description of drawings
Fig. 1 is the overall installation schematic diagram of punctured and embedded insulator of the present invention;
Fig. 2 is the general illustration of punctured and embedded insulator puncture gold utensil of the present invention;
Fig. 3 is the schematic diagram of punctured and embedded insulator puncture gold utensil puncture Partial Feature of the present invention;
Fig. 4 is the schematic diagram of arc resistance insulation of punctured and embedded insulator of the present invention;
Fig. 5 is the schematic diagram of high-field electrode feature of arc resistance insulation of punctured and embedded insulator of the present invention;
Fig. 6 a is the wiring schematic diagram that punctured and embedded insulator of the present invention is used for the lightning impulse discharge test;
Fig. 6 b is the volt-ampere characteristic figure after punctured and embedded insulator of the present invention is used for the lightning impulse discharge test;
Fig. 7 a is that punctured and embedded insulator of the present invention is used for the power frequency arc wiring schematic diagram in when test;
Fig. 7 b is that punctured and embedded insulator of the present invention is used for the power frequency arc layout schematic diagram in when test;
Fig. 7 c is the photo of power frequency arc test back punctured and embedded insulator of the present invention.
Embodiment
Specifically describe the specific embodiment of the present invention below with reference to accompanying drawing, wherein identical label is represented identical parts.
With reference now to Fig. 1, specifically describes the concrete structure that is used to prevent the punctured and embedded insulator of suspended insulated guide wire lightning-caused breaking of the present invention, as shown in Figure 1, punctured and embedded insulator of the present invention mainly comprises with the lower part: arc resistance insulation (among the figure be example with the post insulator) 2, puncture gold utensil 3 and insulating soft wire 4.Wherein, puncture gold utensil 3 penetrates the external insulation layer of insulated conductor 1, closely electrically contacts with insulated conductor 1 conductor inside; Insulating soft wire 4 connects arc resistance insulation 2 and puncture gold utensil 3, makes both current potentials identical; When thunder and lightning took place, by 2 discharges of arc resistance insulation, thereby protection insulated conductor 1 was not punctured.
Wherein, puncture gold utensil 3 and insulating soft wire 4 and insulating soft wire 4 and the 2 closely electrical couplings of arc resistance insulation, identical to guarantee its current potential, and can stand the impact of short circuit current.
Fig. 2 is the schematic diagram of the puncture gold utensil 3 in the punctured and embedded insulator of the present invention, and as shown in FIG., puncture gold utensil 3 is made up of torsion nut 5, top board 6, lower platen 7 and insulating cover 8.Upper and lower pressing plate 6,7 can have different shape and size, but will satisfy following requirement, as Fig. 3, on top board 6 and lower platen 7 and insulated conductor 1 contacted surface, leaves groove 9 respectively, plays the effect of fixing cord.The end radius of circle R of groove 9 and the radius of insulated conductor 1 are complementary, the middle part of groove 9 is the cutter tooth of thorn-like, the quantity of cutter tooth is preferably about 6-48, the point of a knife of all cutters tooth is positioned on the cylindrical profile face that radius is R1, radius R 1 is complementary with insulated conductor 1 conductor inside section radius, and error is positive and negative 5 millimeters.The surface applied conductive seal glue of cutter tooth.After last lower lock block compressed lead, it was approximately the 0.5-5 millimeter at a distance of the clearance distance D between the closest approach.Compress upper and lower pressing plate 6,7 by torsion nut 5, make cutter tooth penetrate the lead external insulation layer, with the tight electrical coupling of metal of inside.The torsion nut can rupture under the stress of regulation, thus make puncture part both with the lead close-coupled, can not influence the intensity and the performance of insulated conductor 1 again.
Wherein, insulating cover 8 is placed in the outside of puncture gold utensil 3, adopts the organic composite material manufacturing, has good flame retardancy, weather resistance and insulation property.Insulating cover 8 can have different shape and size, even can be coated on puncture gold utensil 3 outside global formations, but insulating cover 8, insulating soft wire 4 and the coupling part between them of puncture gold utensil 3 should strict sealing prevent entering of moisture and burning of electric arc.
Wherein, the insulating material of insulating soft wire 4 also has good flame retardancy, weather resistance and insulation property, and insulating soft wire 4 two ends closely electrically connect with puncture gold utensil 3 and arc resistance insulation 2 respectively.When puncture gold utensil 3 is installed and the distance between arc resistance insulation 2 keep 80 millimeters at least, to guarantee that when aerial condutor is subjected to displacement punctured and embedded insulator of the present invention can operate as normal.
Fig. 4 is the overall installation figure of arc resistance insulation (among the figure be example with the post insulator) 2, as shown in the figure, arc resistance insulation 2 mainly comprises with the lower part: the high-field electrode of forming by high-field electrode body 12 and high-field electrode briquetting 13, by insulated part 11, on connect gold utensil 14, lower link gold utensil 15 is formed insulation assembly, insulation protective hood 10.Wherein, the conductor inside of high-field electrode and insulating soft wire 4 closely electrically connects, to have identical current potential with high-tension line.
Insulated part 11 adopts porcelain insulating or organic combined insulated, and upper and lower connection gold utensil 14 and 15 is separately fixed at the two ends up and down of insulated part 11.Can closely electrically connect connecting gold utensil 14 on high-field electrode and the insulation assembly by watering modes such as dress, screw thread or welding, also can will go up connection gold utensil 14 earlier and make a part, connect with insulated part 11 again with the high-field electrode body by means such as casting or machinings.One end of insulation assembly is by lower link gold utensil 15 ground connection, and the other end is by the fixing high-field electrode of last connection gold utensil 14; Insulation protective hood 10 is fixed on the outside of high-field electrode, plays the effect of insulation and limit arc, leaves the gap between its inner chamber and the high-field electrode.
High-field electrode briquetting 13 can have different shape and size with body 12.But high-field electrode will satisfy following requirement.As shown in Figure 5, on briquetting 13 and body 12 and insulated conductor 1 contacted surface, define groove 18, the radius of the radius R of groove and insulated conductor 1 is complementary, and plays the effect of fixing and support wire.High-field electrode should have enough thickness along the lead direction, and this thickness is preferably about 35-150 millimeter, so that bear repeatedly burning of power frequency arc.
The insulation protective hood 10 of high-field electrode outside adopts the organic composite material manufacturing, has good flame retardancy, weather resistance and insulation property.Can keep about 2-60 mm clearance between the inner chamber of insulation protective hood 10 and the high-field electrode, error range is no more than positive and negative 10 millimeters along blow-by and concordant substantially with the edge, the end of high-field electrode at its end.Satisfying under the situation of above-mentioned requirements, insulation protective hood 10 can be selected different shape and size.
More than described the concrete structure of punctured and embedded insulator of the present invention,, further specified the implementation result of punctured and embedded insulator of the present invention below by test data:
1. lightning impulse discharge test
This test is in order to check under the lightning impulse effect, and whether can flashover all on arc resistance insulation 2 of punctured and embedded insulator, promptly locate the power frequency arc path effectively, and definite lightning impulse discharge voltage value.
Test connection is shown in Fig. 6 a, and each parts is respectively among the figure: arc resistance insulation 2 of impulse voltage generator G, oscilloscope S, resitstance voltage divider D, insulated conductor 1, punctured and embedded insulator of the present invention and puncture gold utensil 3.The positive polarity lightning impulse discharge voltage U50% of punctured and embedded insulator and the result of the test of volt-second characteristic see the following form and accompanying drawing 6b.
| Atmospheric conditions: td=23 ℃ tw=17.5 ℃ air pressure 101.4kPa | |||||||
| Discharge voltage mean value (kV) | 267.52 | 275.64 | 292.78 | 315.72 | 315.95 | 343.30 | 394.82 |
| Time to chopping mean value (μ s) | 3.96 | 2.59 | 2.35 | 1.87 | 1.58 | 1.25 | 0.96 |
| Discharge path | Each point of discharge carries out 20 tests, and the path all is that high-field electrode is to the steel pin | ||||||
| U50％ (kV) | 267 | ||||||
Result of the test shows, all occurs at flashover under the Lightning Over-voltage effect on arc resistance insulation 2 of punctured and embedded insulator of the present invention, can locate the power frequency arc path effectively.
2. power frequency arc test
This test is the effect that can the degree of burning for arc resistance insulation 2 of checking power frequency continued flow electric arc arc root behind the lightning stroke flashover be fixed on burning on arc resistance insulation 2 of punctured and embedded insulator of the present invention, punctured and embedded insulator and guardwire avoid burning.
Test connection is shown in Fig. 7 a, and each parts is respectively among the figure: power supply P, switch tool K, transformer T, isolating switch K1, K2, reactor L1, current transformer CT, arc resistance insulation 2 and puncture gold utensil 3, and arrange according to Fig. 7 b.The about 12.5kA of amplitude of short circuit, duration 0.23s, the test of the short circuit power frequency of closing a floodgate arcing.
Result of the test shows, electric arc arc root is fixed on burning on arc resistance insulation 2 of punctured and embedded insulator of the present invention, and guardwire avoids burn effectively.
Fig. 7 c is the photo of test back punctured and embedded insulator of the present invention, and high-field electrode burns vestige on it, but insulated conductor is not burnt.
Above result of the test shows that punctured and embedded insulator of the present invention can prevent 10kV suspended insulated guide wire lightning-caused breaking effectively.
In addition, arc resistance insulation in the punctured and embedded insulator of the present invention is not limited to use the post insulator in the foregoing description, also can use the insulator of suspension insulator and other form, dependency structure can be changed accordingly with reference to foregoing, this is very clearly for those of ordinary skills, for avoiding repetition in the description of this omission to it.
Although invention has been described; but foregoing description just for illustrative purposes; the invention is not restricted to above-mentioned specific descriptions in conjunction with the accompanying drawings; those of ordinary skills can not break away from the various changes of spirit of the present invention to it, and protection scope of the present invention is limited by the accompanying Claim book.
Claims (18)
1. punctured and embedded insulator that is used to prevent the suspended insulated guide wire lightning-caused breaking is characterized in that comprising:
Arc resistance insulation (2) is installed on the described suspended insulated guide wire, be used to locate the lightning flash over path and fixedly power frequency arc burn a little; Puncture gold utensil (3), the insulating barrier and the conductor inside that penetrate insulated conductor (1) closely electrically contact;
Insulating soft wire (4) is used to electrically connect arc resistance insulation (2) and puncture gold utensil (3), makes when thunder and lightning takes place, and discharges by arc resistance insulation (2).
2. punctured and embedded insulator as claimed in claim 1, it is characterized in that: described puncture gold utensil is by top board (6), lower platen (9) and insulating cover (8) are formed, define the groove (9) of fixing cord between the contacted surface of upper holder block and lower lock block and insulated conductor, the end radius of circle (R) of groove is complementary with the radius of insulated conductor, the middle part of groove is provided with the cutter tooth of a plurality of thorn-likes, the point of a knife of each cutter tooth is positioned on the cylindrical profile face that is complementary with insulated conductor conductor inside section radius, make after described puncture gold utensil compresses lead described cutter tooth penetrate lead external insulation layer and with the tight electrical coupling of metal of inside.
3. punctured and embedded insulator as claimed in claim 2 is characterized in that: the surface applied conductive seal glue of described cutter tooth.
4. punctured and embedded insulator as claimed in claim 2 is characterized in that: the quantity of described cutter tooth is 6-48.
5. punctured and embedded insulator as claimed in claim 2 is characterized in that: after lower platen compresses lead on the described puncture gold utensil, be the 0.5-5 millimeter at a distance of the distance (D) between the closest approach therebetween.
6. punctured and embedded insulator as claimed in claim 2 is characterized in that: described puncture gold utensil also comprises the torsion nut (5) that is used for fixing lower platen, and the torsion nut can rupture under the stress of regulation.
7. punctured and embedded insulator as claimed in claim 2 is characterized in that: the strict sealing of insulating cover, insulating soft wire and the coupling part between them of puncture gold utensil.
8. punctured and embedded insulator as claimed in claim 1 or 2 is characterized in that: the length of insulating soft wire keeps 80 millimeters at least.
9. punctured and embedded insulator as claimed in claim 1 or 2 is characterized in that: described arc resistance insulation is post insulator.
10. punctured and embedded insulator as claimed in claim 2 is characterized in that: the insulating cover of described puncture gold utensil outside adopts the organic composite material manufacturing.
11. punctured and embedded insulator as claimed in claim 1 or 2, it is characterized in that: arc resistance insulation further comprises: the high-field electrode (12 that electrically connects with insulating soft wire, 13), insulation assembly and insulation protective hood (10), wherein on described high-field electrode and the contacted surface of insulated conductor, be respectively equipped with groove (18), the radius of its radius (R) and insulated conductor is complementary, and wherein leaves the gap between the inner chamber of insulation protective hood and the high-field electrode.
12. punctured and embedded insulator as claimed in claim 11 is characterized in that: described high-field electrode is made up of briquetting (13) and body (12).
13. punctured and embedded insulator as claimed in claim 11 is characterized in that: high-field electrode is constructed so that along the thickness of lead direction it can bear repeatedly burning of power frequency arc.
14. punctured and embedded insulator as claimed in claim 13 is characterized in that: high-field electrode is the 35-150 millimeter along the thickness of lead direction.
16. punctured and embedded insulator as claimed in claim 11 is characterized in that: described insulation assembly by insulated part (11), on connect gold utensil (14) and lower link gold utensil (15) is formed, upper and lower connection gold utensil is separately fixed at the two ends up and down of insulated part.
17. punctured and embedded insulator as claimed in claim 16 is characterized in that: insulated part adopts porcelain insulating or organic combined insulated.
18. punctured and embedded insulator as claimed in claim 11 is characterized in that: the end of insulation protective hood, is along blow-by along concordant substantially with the edge, the end of high-field electrode at the end of insulation protective hood.
19. punctured and embedded insulator as claimed in claim 18 is characterized in that: the 2-30 mm clearance is arranged between the inner chamber of insulation protective hood and the high-field electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03120005 CN1238864C (en) | 2003-03-10 | 2003-03-10 | Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03120005 CN1238864C (en) | 2003-03-10 | 2003-03-10 | Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1480960A true CN1480960A (en) | 2004-03-10 |
| CN1238864C CN1238864C (en) | 2006-01-25 |
Family
ID=34152787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03120005 Expired - Lifetime CN1238864C (en) | 2003-03-10 | 2003-03-10 | Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1238864C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390978A (en) * | 2015-11-11 | 2016-03-09 | 国家电网公司 | Lightning-caused breakage preventing method for insulated overhead line |
-
2003
- 2003-03-10 CN CN 03120005 patent/CN1238864C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390978A (en) * | 2015-11-11 | 2016-03-09 | 国家电网公司 | Lightning-caused breakage preventing method for insulated overhead line |
| CN105390978B (en) * | 2015-11-11 | 2018-06-22 | 国家电网公司 | The anti-lightning strike broken string method of insulated over-head line |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1238864C (en) | 2006-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201075637Y (en) | Puncture type lightning protection equipment for preventing aerial insulated wire lightning stroke yarn cutting | |
| CN202058515U (en) | Insulating overhead line insulator lightning protection overvoltage protector | |
| CN201307473Y (en) | Lightning protector for 10 kV line | |
| CN1290241C (en) | Arc tight punctured anchor clamp for preventing broken wire of aerial insulated conductor caused by lightning strike | |
| CN2622817Y (en) | Puncture clamped insulator for preventing overhead insulating lead from breaking by lighting stroke | |
| CN101546637A (en) | Installation hardware for connecting insulated conductor and insulator | |
| CN201348907Y (en) | Lightning protector of 10kV line | |
| CN1238864C (en) | Punctured and embedded insulator for preventing broken wire of aerial insulated conductor caused by lightning strike | |
| CN111293661B (en) | Bidirectional lightning protection disconnection protection method and device for insulated conductor | |
| CN201051641Y (en) | Arrester with external serial gap | |
| CN101174497A (en) | Lightning protection supporting insulator and insulated cable used with it | |
| CN202650738U (en) | Electric discharge clamping porcelain insulator | |
| CN200983490Y (en) | Arc penetration resisting gold instrument preventing air insulation lead from thunder shock and breaking | |
| CN1258193C (en) | Compound post insulator for preventing broken wire of aerial insulated conductor caused by lightning strike | |
| CN100550551C (en) | Prevent the are-tight puncture gold utensil that the suspended insulated guide wire lightning-caused breaking is used | |
| CN2610539Y (en) | Arc-tight puncture armour clamp for preventing breakage of overhead insulated wire by thunderstrike | |
| CN201663021U (en) | Bidirectional lightning protection pillar insulator | |
| CN207265416U (en) | A kind of 10kV exchanges overhead transmission line arc blowing type lightning protection device | |
| CN2645186Y (en) | Composite strut insulator for preventing overhead insulated wire lightning stroke breakage | |
| CN108257744A (en) | Overhead insulated conductor lightning protection strikes off line apparatus | |
| CN211606057U (en) | Bidirectional lightning protection and disconnection protection device for insulated conductor | |
| CN103971865A (en) | Discharge gap cross-arm insulator | |
| CN2847475Y (en) | Metal oxide lightning arrester with external series gap for protective insulation conductor | |
| CN204614563U (en) | A kind of asymmetric penetrating electrodes for Penetrative lightning arrester | |
| CN101105991A (en) | Penetration type lightning protection metal fittings for preventing breaking of suspended insulated guide wire by lighting strike |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060125 |
|
| CX01 | Expiry of patent term |