CN1258193C - Compound post insulator for preventing broken wire of aerial insulated conductor caused by lightning strike - Google Patents
Compound post insulator for preventing broken wire of aerial insulated conductor caused by lightning strike Download PDFInfo
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- CN1258193C CN1258193C CN 03120003 CN03120003A CN1258193C CN 1258193 C CN1258193 C CN 1258193C CN 03120003 CN03120003 CN 03120003 CN 03120003 A CN03120003 A CN 03120003A CN 1258193 C CN1258193 C CN 1258193C
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- field electrode
- post insulator
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- composite post
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Abstract
The present invention discloses a composite strut insulator for preventing the wire break of an aerial insulated conducting wire from lightning strike, which solves a problem of the wire break of the aerial insulated conducting wire caused by the lightning strike and mainly comprises high-voltage electrodes (4, 5), insulated strut components (3, 7, 6) and an insulating protective cover (1) fixed to the outside of the high-voltage electrodes for insulation and arc limitation, wherein the high-voltage electrodes are electrically connected with metal conductors in the inside of an insulated conducting wire tightly in a mode of peeling the insulation layer of the insulated conducting wire (2) for positioning lightning flash over paths and fixing cauterization points of power frequency electric arcs; one end of each insulated strut component is fixed to the high-voltage electrodes, and the other end is earthed; gaps are formed between an inner cavity of the insulating protective cover and the high-voltage electrodes. The present invention has the characteristics of short peeling length of the insulated conducting wire, good properties of lightning strike prevention, wire break prevention and smudginess prevention, simple construction and filling of national technical blanks, and the insulating protective cover is added to the outside of the exposed part of the present invention.
Description
Technical field
The present invention relates to the electric power system overhead distribution, relate in particular to a kind of composite post insulator that is used to prevent the suspended insulated guide wire lightning-caused breaking, it is particularly suitable for using on the 10kV suspended insulated guide wire.
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 present 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 the preventing arc wire clamp 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 preventing arc wire clamp, 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 composite post 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 composite post insulator of suspended insulated guide wire lightning-caused breaking from comprising: high-field electrode, the mode of the insulating barrier by peeling off insulated conductor and the metallic conductor of insulated conductor inside closely electrically connect, be used to locate the lightning flash over path and fixedly power frequency arc burn a little; The insulation column assembly, the one end is high-field electrode fixedly, other end ground connection; And insulation protective hood, be fixed on the high-field electrode outside and be used for insulation and limit arc, leave the gap between insulation protective hood inner chamber and the high-field electrode.
Composite post insulator of the present invention has that the insulated conductor strip length is short, exposed part adds insulation protective hood, anti-lightning strike broken string, antifouling property is good, construction is simple, fill up characteristics such as domestic technique blank.Particularly; it has the following advantages: (1) since the metallic conductor that composite post insulator of the present invention and insulated conductor are peeled off closely electrically connect; the conductor current potential is clamped in high-field electrode; make lightning discharge occur on the high-field electrode all the time; the arc root of the power frequency short circuit current electric arc that continues is fixed on the body of high-field electrode and burns, thereby guardwire avoids burn.(2) because composite post insulator of the present invention only need be peeled off the insulating barrier of a bit of insulated conductor, and install insulation protective hood additional in the outside of high-field electrode, whole insulator does not have exposed part, thereby in the operation of power networks process, can reduce the short circuit accident that causes owing to reasons such as foreign matter collisions; (3) the high-field electrode thickness of composite post insulator of the present invention is bigger, thereby stands multiplex's burning of electric arc frequently.(4) composite post insulator of the present invention is easy for installation, quick, satisfies the action need of job site.(5) external insulation of composite post insulator of the present invention can adopt the silastic material manufacturing, thereby has good antifouling property and weather protection aging.
Description of drawings
Fig. 1 is the overall installation schematic diagram of composite post insulator of the present invention;
Fig. 2 is the vertical high-field electrode body schematic diagram of composite post insulator of the present invention;
Fig. 3 is the vertical high-field electrode briquetting schematic diagram of composite post insulator of the present invention;
Fig. 4 is a body schematic diagram under the horizontal high-pressure electrode of composite post insulator of the present invention;
Fig. 5 is the horizontal high-pressure electrode briquetting schematic diagram of composite post insulator of the present invention;
Fig. 6 is the horizontal high-pressure electrode upper body schematic diagram of composite post insulator of the present invention;
Fig. 7 a and Fig. 7 b are respectively the schematic diagrames of two kinds of insulation protective hoods of vertical high-field electrode of composite post insulator of the present invention;
Fig. 8 a is the wiring schematic diagram that composite post insulator of the present invention is used for the lightning impulse discharge test;
Fig. 8 b is the volt-ampere characteristic figure after composite post insulator of the present invention is used for the lightning impulse discharge test;
Fig. 9 a is that composite post insulator of the present invention is used for the power frequency arc wiring schematic diagram in when test;
Fig. 9 b is that composite post insulator of the present invention is used for the power frequency arc layout schematic diagram in when test;
Fig. 9 c is the photo after the composite post insulator power frequency arc test 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 composite post insulator of suspended insulated guide wire lightning-caused breaking of the present invention, as shown in Figure 1, composite post insulator of the present invention mainly comprises with the lower part: the high-field electrode of being made up of high-field electrode body 5 and high-field electrode briquetting 4; By insulated part 3, on connect gold utensil 6, lower link gold utensil (steel pin) 7 is formed the insulation column assembly; Insulation protective hood 1.Wherein,, make the metallic conductor close-coupled of high-field electrode and insulated conductor 2 inside, make itself and high-tension line have identical current potential by peeling off the mode of wire insulation, be used to locate the lightning flash over path and fixedly power frequency arc burn a little.
Upper and lower connection gold utensil 6,7 is separately fixed at the two ends up and down of insulated part 3.Can going up of insulation column assembly be connected gold utensil 6 by screw thread or welding manner connects with high-field electrode body 5, also can will go up connection gold utensil 6 earlier and make a part, connect with insulated part 3 again with high-field electrode body 5 by means such as casting or machinings.One end of insulation column assembly is by lower link gold utensil 7 ground connection, and the other end is by the fixing high-field electrode of last connection gold utensil 6; The insulated part 3 of insulation column assembly adopts organic combined insulated, has good flame retardancy, weather resistance and insulation property.Insulation protective hood 1 is fixed on the high-field electrode outside, plays the effect of insulation and limit arc, leaves the gap between its inner chamber and the high-field electrode.
Fig. 2 and Fig. 3 show the vertical high-field electrode body 5 and the high-field electrode briquetting 4 of composite post insulator of the present invention respectively, as shown in the figure, on briquetting 4 and body 5 and the contacted surface of insulated conductor of peeling off, leave groove 8 respectively, play the effect of fixing cord.Groove 8 middle parts are a sulculus, two ends are vats, the arc radius of sulculus and big slot cross-section bottom is respectively RA and RB, the radius R A of sulculus is complementary with the plain conductor radius of peeling off, the radius of the radius R B of vat and unstripped insulated conductor is complementary, and the length H2 of sulculus is less than the strip length of lead, and the length H1 of whole groove is greater than the length of wire stripping, preferably, the two ends vat comprises at least 3 millimeters unstripped insulated conductors respectively.High-field electrode is having enough thickness along the lead direction, and this thickness is preferably about 30-150 millimeter, so that bear repeatedly burning of power frequency arc.
In addition, the body of high-field electrode can have different shape and size with briquetting, Fig. 4-Figure 6 shows that the high-field electrode briquetting and the body of another kind of shape.With above-mentioned description basically identical to Fig. 2 and Fig. 3, but high-field electrode wherein comprises high-field electrode briquetting shown in Fig. 5 and the high-field electrode body that comprises the body the first half shown in the body the latter half shown in Fig. 4 and Fig. 6.For fear of repetition, omit detailed description at this.
With reference now to Fig. 7 a and 7b,, it is respectively the insulation protective hood of two kinds of forms of the vertical high-field electrode of composite post insulator of the present invention.Wherein Fig. 7 a is the overlap joint button, and Fig. 7 b is a board plug type.Insulation protective hood 1 is installed on the outside of high-field electrode, plays the insulating protection effect, and it can adopt the organic composite material manufacturing, has good flame retardancy, weather resistance and insulation property.The profile of insulation protective hood 1 and size also can have other selection.When mounted, make and to keep about 2-60 mm clearance between the inner chamber of insulation protective hood 1 and the high-field electrode, error range is no more than positive and negative 10 millimeters along concordant substantially with the edge, the end of high-field electrode at the end of insulation protective hood 1, and the bottom of insulation protective hood 1 can not seal.
More than described the concrete structure of composite post insulator of the present invention,, further specified the advantage of composite post 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 can whether flashover all occurs on the composite post insulator, promptly locate the power frequency arc path effectively, and definite lightning impulse discharge voltage value.
Test connection is shown in Fig. 8 a, and each parts is respectively among the figure: impulse voltage generator G, oscilloscope S, resitstance voltage divider D, insulated conductor 2 and composite post insulator of the present invention 12.
Wherein, positive polarity lightning impulse discharge voltage, U50% and the volt-second characteristic of composite post insulator are shown in following table and accompanying drawing 8b curve:
| Atmospheric conditions: td=23 ℃ tw=17.5 ℃ air pressure 101.4kPa | |||||||
| Discharge voltage mean value (kV) | 268.53 | 275.54 | 292.82 | 315.82 | 315.96 | 343.28 | 395.84 |
| Time to chopping mean value (μ s) | 3.95 | 2.58 | 2.36 | 1.86 | 1.59 | 1.24 | 0.95 |
| 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) | 269 | ||||||
Above-mentioned result of the test shows, all occurs on the composite post insulator 12 at flashover under the Lightning Over-voltage effect, 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 the high-field electrode of checking power frequency continued flow electric arc arc root behind the lightning stroke flashover be fixed on burning, composite post insulator 12 on the composite post insulator 12 and guardwire avoid burning.
Test connection is shown in Fig. 9 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 and composite post insulator 12, and arrange according to Fig. 9 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 that after composite post insulator 12 was installed, electric arc arc root was fixed on the high-field electrode and burns, and guardwire avoids burn effectively.
Fig. 9 c is the photo of power frequency arc test back composite post insulator, and high-field electrode burns vestige on it, but insulated conductor is not burnt.
Above result of the test shows that composite post insulator of the present invention can prevent 10kV suspended insulated guide wire lightning-caused breaking effectively.
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 (9)
1. composite post insulator that is used to prevent the suspended insulated guide wire lightning-caused breaking is characterized in that comprising:
High-field electrode (4,5), the mode of the insulating barrier by peeling off insulated conductor (2) and the metallic conductor of insulated conductor inside closely electrically connect, be used to locate the lightning flash over path and fixedly power frequency arc burn a little;
Insulation column assembly (3,7,6), the one end is high-field electrode fixedly, other end ground connection; And
Insulation protective hood (1) is fixed on the high-field electrode outside and is used for insulation and limit arc, leaves the gap between insulation protective hood inner chamber and the high-field electrode.
2. composite post insulator as claimed in claim 1, it is characterized in that, described high-field electrode further comprises high-field electrode briquetting (4) and high-field electrode body (5), on briquetting and body and the contacted surface of insulated conductor of peeling off, be respectively equipped with the groove (8) of fixing cord, the middle part of wherein said groove is a sulculus, two ends are vats, the arc radius (RA) of bottom, sulculus cross section is complementary with the radius of the plain conductor of peeling off, and the radius of the arc radius (RB) of big slot cross-section bottom and unstripped insulated conductor is complementary, the length of sulculus (H2) is less than the strip length of lead, and the length of whole groove is greater than the length of wire stripping.
3. composite post insulator as claimed in claim 2 is characterized in that, the vat at two ends comprises at least 3 millimeters unstripped insulated conductors respectively.
4. composite post insulator as claimed in claim 1 or 2 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.
5. composite post insulator as claimed in claim 4 is characterized in that, high-field electrode is the 30-150 millimeter along the thickness of lead direction.
6. composite post insulator as claimed in claim 1 or 2, it is characterized in that, described insulation column assembly further comprises: insulated part (3), on connect gold utensil (6), lower link gold utensil (7), upper and lower connection gold utensil is separately fixed at the two ends up and down of insulated part.
7. composite post insulator as claimed in claim 6 is characterized in that insulated part adopts organic combined insulated material.
8. composite post insulator as claimed in claim 1 or 2 is characterized in that, its bottom does not seal along concordant substantially with the edge, the end of high-field electrode at the end of insulation protective hood.
9. composite post insulator as claimed in claim 1 or 2 is characterized in that, the 2-60 mm clearance is arranged between insulation protective hood inner chamber and the high-field electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03120003 CN1258193C (en) | 2003-03-10 | 2003-03-10 | Compound post 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 03120003 CN1258193C (en) | 2003-03-10 | 2003-03-10 | Compound post insulator for preventing broken wire of aerial insulated conductor caused by lightning strike |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1480959A CN1480959A (en) | 2004-03-10 |
| CN1258193C true CN1258193C (en) | 2006-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03120003 Expired - Lifetime CN1258193C (en) | 2003-03-10 | 2003-03-10 | Compound post insulator for preventing broken wire of aerial insulated conductor caused by lightning strike |
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| Country | Link |
|---|---|
| CN (1) | CN1258193C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496428B (en) * | 2011-12-09 | 2014-12-31 | 奉化市供电局 | 10KV overhead line porcelain bottle protection device |
| CN103997009B (en) * | 2014-05-29 | 2016-08-31 | 国家电网公司 | A kind of method preventing suspended insulated guide wire ablation |
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2003
- 2003-03-10 CN CN 03120003 patent/CN1258193C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1480959A (en) | 2004-03-10 |
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Granted publication date: 20060531 |