CN101202431B - Insulation tower head for power distribution network overhead line - Google Patents
Insulation tower head for power distribution network overhead line Download PDFInfo
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- CN101202431B CN101202431B CN2007101949767A CN200710194976A CN101202431B CN 101202431 B CN101202431 B CN 101202431B CN 2007101949767 A CN2007101949767 A CN 2007101949767A CN 200710194976 A CN200710194976 A CN 200710194976A CN 101202431 B CN101202431 B CN 101202431B
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Abstract
The invention discloses an insulation tower head used for a distribution network overhead line, relating to the field of distribution network overhead line lightning overvoltage protection; wherein, the insulation tower head comprises an insulation pillar which is used for single-circuit or same-rod multi-circuit line. The insulation tower head also comprises a cross arm insulator or a cross arm and a pin-typed/pillar insulator; wherein, an overhead lead is fixed at one end of the cross arm insulator or on the pin-typed/pillar insulator at the end of the cross arm; the other end of the downmost cross arm or the middle part of the cross arm is fixed at the upper end of the insulation pillar; the lower end of the insulation pillar is fixed on the top of a power pole. According to the practical requirement of the system, the insulation pillar, the composite/ceramic cross arm insulator, the insulation/metal cross arm and the pin-typed/pillar insulator can be combined for usage to form the insulation tower head with a plurality of structure types, thus greatly improving the insulation level of the line and effectively preventing the accidents of line trip, insulator damage and insulation lead breakdown, etc. which are caused by lightning induction overvoltage of overhead line.
Description
Technical field
The present invention relates to electric distribution network overhead wire lightning overvoltage protection field, more specifically, relate to insulation tower head for power distribution network overhead line.
Background technology
Electric distribution network overhead wire lead distance perpendicular to the ground is lower, and lightning protection is based on the anti-induction thunder.For built on stilts plain conductor circuit, after lightning overvoltage caused insulator arc-over, the power frequency continued flow electric arc that the continues insulator surface glaze layer that tends to ablate may cause cluster parachute to burst when serious; For the suspended insulated guide wire circuit, after lightning overvoltage causes wire insulation and insulator breakdown flashover, the power frequency continued flow electric arc arc root that continues is subjected to the anticoagulation of insulating barrier, is fixed on the breakdown point place burning on the insulated conductor, and insulated conductor will soon be blown.
At present, the lightning protection measure adopted of electric distribution network overhead wire mainly comprises lightning conducter, protection gap and lightning arrester etc. is installed.Lightning conducter can reduce the induction overvoltage amplitude on the lead by electromagnetic shielding action, reduces the number of times of circuit generation lightning stroke flashover, but effect and not obvious.The protection gap utilizes special gold utensil to limit the lightning impulse discharge path; dredging power frequency continued flow electric arc arc root leaves lead and burns to gold utensil; and the power frequency arc that this gold utensil can tolerate certain energy and number of times burns, and damages thereby effectively protect insulator or insulated conductor to avoid thunderbolt.Circuit reclosing probability of successful has been improved in the protection gap, and shortcoming is that self does not possess the arc extinguishing ability.Lightning arrester utilizes the nonlinear characteristic of metal oxide resistance; absorb the thunder and lightning energy, suppress the power frequency continued flow starting the arc; protection insulator or insulated conductor avoid being struck by lightning when damaging; can prevent transmission line caused by lightning strike; it is a kind of desirable lightning protection measure; shortcoming is that cost is higher, needs periodic maintenance in the running.
Start with from the angle that improves the line insulation level, develop a kind of safeguard procedures that can tolerate the overhead transmission line thunder and lightning induction voltage, prevent the generation of electric distribution network overhead wire lightning strike accident, will have great Practical significance and wide application prospect.
Summary of the invention
The electric pole majority that electric distribution network overhead wire is used is cement pole or Metallic rod (below be referred to as electric pole), and existing tower head has two kinds of patterns, and a kind of is that cross arm insulator self plays cross-arm, upright load effect, constitutes tower head at the fixing cross arm insulator of the head of the mast; Another kind is to pass through anchor ear fixing metal cross-arm, upright load at the head of the mast, cross-arm, the upright load end installation pin type/conventional insulator fixing cord of pillar, metal cross arm, upright load and the whole formation of insulator tower head.The plain conductor insulation against ground is exactly the insulation of insulator, and the insulated conductor insulation against ground is that insulator dielectric adds the wire insulation insulation.
According to an aspect of the present invention, a kind of insulation tower head for power distribution network overhead line is provided, comprise single time or with many loop lines of bar road cross arm insulator, wherein aerial condutor is fixed on an end of cross arm insulator, it is characterized in that: described insulation tower head also comprises insulation column, wherein the other end of nethermost cross arm insulator is fixed to the upper end of insulation column, and the bottom of insulation column is fixed to the top of electric pole.
According to a further aspect in the invention, a kind of insulation tower head for power distribution network overhead line is provided, comprise single time or with many loop lines of bar road with cross-arm, conventional insulator and upright load, wherein aerial condutor is fixed on the conventional insulator, it is characterized in that: described insulation tower head also comprises insulation column, the bottom of described upright load and the middle part of nethermost cross-arm all are fixed to the upper end of insulation column, and the bottom of insulation column is fixed to the top of electric pole.
The present invention starts with from improving the line insulation level angle, the additional insulation column of installing in the electric pole upper end, cross arm insulator is installed by different modes in the insulation column upper end, insulation/metal cross arm, upright load perhaps are installed, insulation column and cross arm insulator, cross-arm, upright load and insulator are used in combination, a kind of insulation tower head for power distribution network overhead line that proposes, it can significantly improve the line insulation level.
Simulation study shows, the maximum thunder and lightning induction voltage amplitude that produces on the electric distribution network overhead wire, generally be no more than 400～500kV, adopt insulation tower head, can make circuit tolerate maximum thunder and lightning induction voltage, prevent the generation of the accidents such as line tripping, insulator damage and insulated conductor broken string that overhead transmission line causes because of the thunder and lightning induction voltage effect.
Innovative point of the present invention:
(1) the present invention sets up insulation column on shaft tower, be used in combination with cross arm insulator or insulation/metal cross arm, conventional insulator, significantly to improve the line insulation level, effectively tolerate the thunder and lightning induction voltage that occurs on the circuit, and then significantly improve line lightning resisting level.Effectively prevented the generation of the accidents such as line tripping, insulator damage and insulated conductor broken string that thunder and lightning induction voltage causes, making the protection of induction thunder no longer is the subject matter of power distribution network lightning protection.
(2) the present invention is simple in structure, and is easy for installation, and it is slightly high that cost has tower head now, compares with adopting lightning conducter, protection gap and lightning arrester, and cost is suitable, but the protection better effects if, the operation Maintenance free.
Description of drawings
Power distribution network 6kV, the 10kV of compound/porcelain-arm insulator pattern that Fig. 1 a is that insulation column according to the present invention adds and 20kV single back line are with the structural representation of insulation tower head;
Fig. 1 b is that insulation column according to the present invention adds power distribution network 6kV, the 10kV of insulation/metal cross arm pattern and the structural representation that the 20kV single back line is used insulation tower head;
Fig. 2 a-2c is three kinds of connected modes according to insulation tower head of the present invention and electric pole;
6kV, the 10kV of compound/porcelain-arm insulator pattern that Fig. 3 a is that the typical insulation column of the present invention adds and 20kV double-circuit line on same pole road are with the structural representation of insulation tower head;
Fig. 3 b is that the typical insulation column of the present invention adds 6kV, the 10kV of insulation/metal cross arm pattern and the structural representation that insulation tower head is used on 20kV double-circuit line on same pole road;
Fig. 4 is 6kV of the present invention, 10kV and 20kV use insulation tower head with bar three loop line roads a structural representation; And
Fig. 5 is 6kV of the present invention, 10kV and 20kV use insulation tower head with bar six loop line roads a structural representation.
Embodiment
Specifically describe the embodiment of insulation tower head for power distribution network overhead line of the present invention below in conjunction with accompanying drawing, wherein same or analogous drawing reference numeral is represented same or analogous parts.
At first, be that example is done and specified with 6kV, 10kV and 20kV single back line insulation tower head, its structural representation is seen Fig. 1 a and 1b.Tower head is divided into two kinds of patterns, that is, and and compound/porcelain-arm insulator pattern and insulation/metal cross arm pattern.
Power distribution network 6kV, 10kV and the 20kV single back line insulation tower head of compound/porcelain-arm insulator pattern that Fig. 1 a is that insulation column adds, it mainly comprises insulation column 3 and compound/porcelain-arm insulator 2, compound/the porcelain-arm insulator 2 that wherein adopts the band cluster parachute is as cross-arm, upright load, one end of aerial condutor 1 directly is fixed on compound/porcelain-arm insulator 2, the other end of compound/porcelain-arm insulator 2 is fixed to the upper end of insulation column 3 by flange, and the bottom of insulation column 3 is fixed to head of the mast (not shown).
Fig. 1 b is power distribution network 6kV, 10kV and the 20kV single back line insulation tower head that insulation column adds insulation/metal cross arm pattern, and it mainly comprises insulation column 3, insulation/metal cross arm 4, the upright load 6 of insulation/metal and conventional insulator 5.Aerial condutor 1 directly is fixed on an end of conventional insulator 5, the other end of conventional insulator 5 is respectively fixed to the two ends of insulation/metal cross arm 4 and the upper end of the upright load 6 of insulation/metal, the bottom of the upright load 6 of insulation/metal and the middle part of insulation/metal cross arm 4 all are fixed to the upper end of insulation column 3, and the bottom of insulation column 3 is fixed to head of the mast (not shown).
Wherein insulation column 3 can adopt the porcelain pillar, also can adopt the composite material pillar.
Wherein can adopt high strength, corrosion-resistant, ageing-resistant composite insulating material or metal material as cross-arm, upright load, conventional insulator fixing cord is installed in its end.
For avoiding the part direct lightning strike to cause the alternate puncture flashover of lead, can adopt the three-phase imbalance insulation mode, promptly effectively tolerate under the thunder and lightning induction voltage prerequisite satisfying the three-phase insulation against ground, relatively insulation level is mutually low than the limit in the setting.
In addition, comprise three kinds according to the connected mode of insulation tower head of the present invention and electric pole, that is, and a. metal flange and anchor ear pattern; B. cylinder metal flange pattern; C. interpolation is built pattern, and its schematic diagram is seen Fig. 2 a-Fig. 2 c respectively.
Fig. 2 a is metal flange and anchor ear pattern, directly is fastened on the top of electric pole 8 by metal flange and anchor ear 7; Fig. 2 b is a cylinder metal flange pattern, adopts cylinder metal flange 9, and an end of flange 9 and insulation column 3 pressure injections are integral, and the end of electric pole 8 penetrates the other end inside of drum type brake flange 9, uses the binding material sealing; And Fig. 2 c is that interpolation is built pattern, and with the cylinder pothole that the bottom of insulation column 3 is designed to cave in, electric pole 8 directly inserts, and builds to be integral.
The concrete structure of single back line according to the present invention with insulation tower head more than described, identical with method with many loop lines of bar road with single back line with the mentality of designing of insulation tower head, compound/porcelain-arm insulator the pattern that all adopts insulation column to add, or insulation column adds insulation/metal cross arm, upright load and conventional insulator pattern, can be used in combination according to actual conditions, determine to realize pattern.
Consider that the wind load and the lead deadweight that are subjected to many loop lines of bar road are bigger, single insulation column structure may be difficult to satisfy force request, can adopt many insulation column parallel-connection structures flexibly, by the upper and lower part metal flange insulation column is fixed as one.During practical application, should specifically calculate wind load and lead deadweight according to line loop quantity, and leave enough allowances,, recommend quantity value in parallel in 1～9 scope with this radial diameter and quantity in parallel of selecting insulation column.
Typically see Fig. 3, Fig. 4 and Fig. 5 with the insulation tower head structural representation with many loop lines of bar road, wherein Fig. 3 a shows 6kV, 10kV and the 20kV double-circuit line on same pole road insulation tower head that insulation column adds compound/porcelain-arm insulator pattern, Fig. 3 b shows 6kV, 10kV and the 20kV double-circuit line on same pole road insulation tower head that insulation column adds insulation/metal cross arm pattern, Fig. 4 and Fig. 5 show respectively 6kV, 10kV and 20kV with bar three loop line roads with insulation tower head with bar six loop line road insulation tower heads.
With reference to figure 3a, the double-circuit line on same pole road that adds compound/porcelain-arm insulator pattern at insulation column is with in the insulation tower head, nethermost compound/porcelain-arm insulator 2 is fixed to the upper end of insulation column 3.With reference to figure 3b, the double-circuit line on same pole road that adds insulation/metal cross arm pattern at insulation column is used in the insulation tower head, and the bottom of the upright load 6 of insulation/metal and the middle part of nethermost insulation/metal cross arm 4 all are fixed to the upper end of insulation column 3.
Fig. 4 and Fig. 5 show respectively with bar three loop line roads usefulness insulation tower head with bar six loop line road insulation tower heads, and have wherein used the parallel-connection structure of many insulation columns 3, and promptly the insulation column group 10.
Since with bar two return, circuits such as three times and six times are known in the field with existing tower head structure, so in the present invention it is done concrete description.In addition, the parameter of insulation tower head comprises mechanical performance parameter and geometric parameter.Mechanical performance parameter refers to that insulation column, cross arm insulator, cross-arm, upright load should be able to tolerate the synergy of lead wind load torsion and lead gravity pressure and do not damage, geometric parameter refers to that the total insulation against ground distance in insulation column, cross arm insulator, cross-arm, upright load and conventional insulator combination back is satisfying under the prerequisite that system's power-frequency voltage requires, should satisfy the requirement of tolerance circuit thunder and lightning induction voltage, as for the lead phase spacing, and, can determine with reference to existing tower head method for designing and technical conditions with loop, many loop lines of bar road spacing.
Although the present invention is specified above, the equivalent process that those of ordinary skills also can revise some concrete structure in above-mentioned or imagine other is realized the present invention.Therefore, the present invention specifically is not limited to the detailed process of above-mentioned execution mode, although for example only described power distribution network 6kV, 10kV and 20kV electric pressure in the specification, certainly, the present invention can be applicable in the tower head of other distribution system electric pressure, as long as insulation column is increased in the bottom of common tower head structure, make to have increased lead insulation height over the ground, then can produce the similar techniques effect; Although and for example only described in the specification with bar twoly return, three times and six loop line roads, certainly, it is contemplated that out also that for those of ordinary skills other is with many loop lines of bar road.
Although present invention is described, foregoing description the invention is not restricted to above-mentioned specific descriptions in conjunction with the accompanying drawings just for illustrative purposes.Those of ordinary skills can carry out various changes and not break away from spirit of the present invention it, and protection scope of the present invention is limited by the accompanying Claim book.
Claims (10)
1. insulation tower head for power distribution network overhead line, comprise single time or with many loop lines of bar road with cross arm insulator (2), wherein aerial condutor (1) is fixed on an end of cross arm insulator (2), it is characterized in that:
Described insulation tower head also comprises insulation column (3), and the other end of wherein nethermost cross arm insulator (2) is fixed to the upper end of insulation column (3), and the bottom of insulation column (3) is fixed to the top of electric pole (8).
2. insulation tower head according to claim 1, wherein said cross arm insulator (2) is compound/porcelain-arm insulator.
3. insulation tower head for power distribution network overhead line, comprise single time or with many loop lines of bar road with cross-arm (4), conventional insulator (5) and upright carry on a shoulder pole (6), wherein aerial condutor (1) is fixed on the conventional insulator (5), it is characterized in that:
Described insulation tower head also comprises insulation column (3), and the middle part of the bottom of described upright load (6) and nethermost cross-arm (4) all is fixed to the upper end of insulation column (3), and the bottom of insulation column (3) is fixed to the top of electric pole (8).
4. insulation tower head according to claim 3, wherein said cross-arm (4) is composite insulation cross arm or metal cross arm, and described upright load (6) is upright load of compound inslation or the upright load of metal.
5. according to claim 1 or 3 described insulation tower heads, wherein use the parallel-connection structure of a plurality of insulation columns (3).
6. insulation tower head according to claim 5, wherein the value of the quantity in parallel of insulation column (3) is in 1～9 scope.
7. according to claim 1 or 3 described insulation tower heads, wherein said insulation column (3) is fastened on the electric pole (8) by flange and anchor ear (7).
8. according to claim 1 or 3 described insulation tower heads, wherein said insulation column (3) is integral with an end pressure injection of flange (9), and electric pole (8) penetrates the other end inside of described flange (9), and uses the binding material sealing.
9. according to claim 1 or 3 described insulation tower heads, the pothole that wherein said insulation column (3) bottom is designed to cave in, electric pole (8) directly inserts, and builds and be integral.
10. according to claim 1 or 3 described insulation tower heads, wherein said insulation column (3) adopts porcelain pillar or composite material pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101949767A CN101202431B (en) | 2007-12-07 | 2007-12-07 | Insulation tower head for power distribution network overhead line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101949767A CN101202431B (en) | 2007-12-07 | 2007-12-07 | Insulation tower head for power distribution network overhead line |
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| Publication Number | Publication Date |
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| CN101202431A CN101202431A (en) | 2008-06-18 |
| CN101202431B true CN101202431B (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101949767A Active CN101202431B (en) | 2007-12-07 | 2007-12-07 | Insulation tower head for power distribution network overhead line |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102054545B (en) * | 2009-11-11 | 2012-08-29 | 西北电网有限公司 | 750 kV lattice composite cross-arm insulator |
| CN103993772A (en) * | 2014-06-05 | 2014-08-20 | 国家电网公司 | 110kV lattice composite tower |
| CN105470665A (en) * | 2014-09-11 | 2016-04-06 | 国家电网公司 | Lightening proof method of electric pole and lightening proof electric pole |
| CN107154296A (en) * | 2016-03-02 | 2017-09-12 | 国网辽宁省电力有限公司鞍山供电公司 | The antifouling composite insulation cross arms of 10kV |
| CN108412289A (en) * | 2018-04-28 | 2018-08-17 | 华北电力科学研究院有限责任公司 | A kind of insulation electric pole of 10kV high-tension lines |
| CN108386056A (en) * | 2018-04-28 | 2018-08-10 | 华北电力科学研究院有限责任公司 | A kind of insulation head of 10kV high-tension lines |
| CN111293662B (en) * | 2020-05-13 | 2020-10-09 | 湖南省湘电试研技术有限公司 | Method, device and equipment for determining discharge path control parameters of insulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1247925A2 (en) * | 2001-04-06 | 2002-10-09 | ABB PATENT GmbH | Device for increasing the height of high tension cable masts |
| CN1531619A (en) * | 2001-06-14 | 2004-09-22 | ABB�ɷ�����˾ | Pole-top insulator |
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2007
- 2007-12-07 CN CN2007101949767A patent/CN101202431B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1247925A2 (en) * | 2001-04-06 | 2002-10-09 | ABB PATENT GmbH | Device for increasing the height of high tension cable masts |
| CN1531619A (en) * | 2001-06-14 | 2004-09-22 | ABB�ɷ�����˾ | Pole-top insulator |
Non-Patent Citations (1)
| Title |
|---|
| JP平6-162849A 1994.06.10 |
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