CN106448947A - Method for improving effective distance of air gap of transmission line - Google Patents

Method for improving effective distance of air gap of transmission line Download PDF

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Publication number
CN106448947A
CN106448947A CN201610859768.3A CN201610859768A CN106448947A CN 106448947 A CN106448947 A CN 106448947A CN 201610859768 A CN201610859768 A CN 201610859768A CN 106448947 A CN106448947 A CN 106448947A
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CN
China
Prior art keywords
transmission line
air gap
electricity
wire
improving transmission
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
Application number
CN201610859768.3A
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Chinese (zh)
Other versions
CN106448947B (en
Inventor
杜勇
姚京松
王羽
蓝磊
李柏松
吴军
龙飞
王浩
王惠中
刘晓华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HUBEI CHAONENG ELECTRIC POWER CO Ltd
State Grid Corp of China SGCC
Maintenance Branch of State Grid Hubei Electric Power Co Ltd
Original Assignee
Hubei Super Power & Ultrahigh Pressure Electric Power Technology Development Co Ltd
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Priority to CN201610859768.3A priority Critical patent/CN106448947B/en
Publication of CN106448947A publication Critical patent/CN106448947A/en
Application granted granted Critical
Publication of CN106448947B publication Critical patent/CN106448947B/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06Insulating conductors or cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/30Drying; Impregnating
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/184Sheaths comprising grooves, ribs or other projections

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Bodies (AREA)
  • Insulators (AREA)

Abstract

The invention provides a method for improving the effective distance of the air gap of a transmission line. The method comprises the following steps: insulating paint coating and curing and insulating sheath wrapping. The method can effectively improve the gap insulation level, reduces the breakdown probability, and guarantees safe and stable operation of the line.

Description

A kind of method for improving transmission line of electricity the air gap coverage
Technical field
The invention belongs to power transmission line electrical fault prevention and control field, more particularly to a kind of transmission line of electricity the air gap of improving have The method of effect distance.
Background technology
Transmission line of electricity is the element of electrical network, with circuit distance, coverage big the features such as, often face each The impact of complicated geographical environment and climatic environment is planted, when adverse environment causes circuit operation failure, circuit will be directly affected Safe and reliable operation, even can cause large area blackout when serious.Extraneous various unfavorable conditions are likely to result in power transmission line Air gap distance on road between the alternate or wire of wire and ground thing reduces, when the electrical strength of this gap distance is not resistant to During by system highest operating voltage, disruptive discharge will occur, prevent the power grid accident for causing because of line fault to be particularly large area Power outage, is still the most important thing of circuit maintenance work.The electric discharge master that transmission line of electricity air gap distance is not enough and causes There are 3 kinds of forms:Wire is in electric discharge, wire between the electric discharge of shaft tower component, wire to periphery object discharge.Transmission line of electricity sheath is to carry One of high transmission line of electricity gap coverage means, have lightweight, no aggravation mild wind to transmission line of electricity parcel insulating sheath and shake The dynamic and advantage such as conductor cord disconnection, strand broking, current applied research is still few.Coatings RTV is with its distinctive hydrophobicity, hydrophobic Animal migration, excellent resistance to Flashover Characteristics and long-acting, weather-proof the advantages of become the first-selection of power system power transmission and transforming equipment antifouling work Coating, its raising effect is significant to flashover voltage, the country there is no people using RTV (room temperature vulcanized silicone rubber) insulant as defeated Electric wire lead insulation coating is wrapped up for improving transmission line of electricity the air gap coverage with reference to insulating sheath.
Content of the invention
In view of this, in order to overcome the deficiencies in the prior art, the invention provides a kind of improve transmission line of electricity the air gap The method of coverage, improves the air gap coverage, effectively administers between power transmission line route, between wire and atural object, distance is not Foot and then situation about puncturing.
In order to achieve the above object, technical scheme is as follows:
A kind of method for improving transmission line of electricity the air gap coverage, comprises the following steps:
1) coating of coatings, in the groove between steel core and aluminum stranded conductor surface stock, coats at least three times PTV insulation materials Material, per the minor tick regular hour, finally coats to certain thickness and makes conductive line surfaces in certain shape;
2) solidify, the wire that coating is completed is hung 20 hours~30 hours at normal temperatures, makes leading for coating coatings Line is fully cured;
3) insulating sheath is wrapped up, and the two ends of insulating sheath possess projection and groove respectively, are applied in raised and groove respectively RTV insulant is covered, raised and groove is closed up, at the gap for closing up, irrigate RTV insulant.
Further, step 1) in, the interval time be more than 20 minutes~50 minutes.
Further, step 2) in, the external diameter of the wire after solidification should be not less than the external diameter of the wire before solidification 1/5.
Further, the sheath is buckle-type.
Further, raised mutually the pressing with the groove can be closed up in hollow cylindrical.
Further, step 3) in, the insulating sheath is silicone rubber.
Further, the thickness of the insulating sheath be not less than 2~5 millimeters.
Beneficial effects of the present invention are:Under same air clearance distance, the method can effectively improve gap insulation level, subtract Little breakdown probability, ensures circuit safe and stable operation.
(1) under the premise of substantially conductor load is not increased, can effective lifting lead wire transmission line insulator characteristic, identical gap Under distance, wire improves at least 15% to atural object the air gap coverage, and between wire, the air gap coverage improves lifting More than 30%, improve the normal running clearance coverage of transmission line of electricity and ensure circuit safe and stable operation;
(2) clearance distance deficiency under extraneous various unfavorable conditions effectively can be administered, and wire is between the electric discharge of shaft tower component, wire Electric discharge, wire to periphery object discharge situation, online between will not hit when air gap distance significantly reduces between line and atural object Wear and even result in tripping operation stoppage in transit;
(3) coatings being coated to transmission line of electricity and wraps up insulating sheath can be applicable on built transmission line of electricity, between pair Stand-off distance carries out improvement from wretched insufficiency circuit and remedies, and also can be applicable on newly-built circuit, ensures defeated when alleviating transmission of electricity corridor anxiety The big problem of electric line safe distance difficulty.
Description of the drawings
Fig. 1 is a kind of transmission line of electricity coating PTV insulant of method for improving transmission line of electricity the air gap coverage Structural representation;
Fig. 2 is a kind of knot of the transmission line of electricity parcel insulating sheath of method for improving transmission line of electricity the air gap coverage Structure schematic diagram;
1st, steel core;2nd, aluminum stranded conductor;3rd, PTV insulant;4th, buckle;5th, insulating sheath.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with the accompanying drawings and embodiment, right The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not For limiting the present invention.
A kind of method for improving transmission line of electricity the air gap coverage is to administering transmission line wire to shaft tower structure During part electric discharge, should use in electric transmission line isolator high-pressure side side of wire;When puncturing between improvement line, should use in transmission line of electricity shelves Away from each maximum arc sag;During for administering wire to periphery object discharge, should use in wire easily near periphery object Place.
Embodiment 1
As shown in figure 1, a kind of method for improving transmission line of electricity the air gap coverage, comprises the following steps:
1) coating of coatings, in the groove between steel core 1 and 2 surface stock of aluminum stranded conductor, at least three times PTV insulation of coating Material 3, per the minor tick time of 30 minutes, finally coats to certain thickness and makes conductive line surfaces in certain shape;This is certain Shape can be approximately cylindric.
2) solidify, the wire that coating is completed is hung 20 hours~30 hours at normal temperatures, makes leading for coating coatings Line is fully cured;The external diameter of the wire after solidification should be not less than the external diameter 1/5 of the wire before solidification.
3) insulating sheath is wrapped up, the two ends of insulating sheath 5 possess projection and groove respectively.Applied in raised and groove respectively RTV insulant is covered, raised and groove is closed up, as shown in Fig. 2 buckle 4 is formed, the buckle 4 for closing up still suffers from certain gap, RTV insulant need to be irrigated at the gap for closing up, at 4 bonding of buckle and gap, supplementary irrigation RTV insulant 3 ensures insulating sheath 5 close up rear seamless no electric weak spot, and wherein, sheath is buckle-type.
Projection is mutually pressed with groove can close up in hollow cylindrical.Insulating sheath is silicone rubber.Additionally, insulating sheath Thickness be not less than 3 millimeters.
It is proved to administer effect through test by a kind of measure of the raising transmission line of electricity the air gap coverage for constituting above Fruit is good, and under identical clearance distance, line improves at least 15% to atural object the air gap coverage, between line the air gap effectively away from More than 30% is lifted from improving, enforcement is simple, add effect with stable, reliable no bad pair.
Embodiment 2
A kind of method for improving transmission line of electricity the air gap coverage, comprises the following steps:
1) coating of coatings, in the groove between steel core 1 and 2 surface stock of aluminum stranded conductor, coats n times PTV insulant 3, per the minor tick time of 50 minutes, finally coat to certain thickness and conductive line surfaces are made in certain shape;This certain shape Can be approximately cylindric.
2) solidify, the wire that coating is completed is hung 20 hours~30 hours at normal temperatures, makes leading for coating coatings Line is fully cured;The external diameter of the wire after solidification should be not less than the external diameter 1/5 of the wire before solidification.
3) insulating sheath is wrapped up, the two ends of insulating sheath 5 possess projection and groove respectively.Applied in raised and groove respectively RTV insulant is covered, raised and groove is closed up, buckle 4 is formed, the buckle 4 for closing up still suffers from certain gap, need to close up Irrigate at gap supplementary irrigation RTV insulant 3 at RTV insulant, 4 bonding of buckle and gap ensure insulating sheath 5 close up after no Gap no electric weak spot.Wherein, sheath is buckle-type.
Projection is mutually pressed with groove can close up in hollow cylindrical.Insulating sheath is silicone rubber, additionally, insulating sheath Thickness be not less than 4 millimeters.
It is proved to administer effect through test by a kind of measure of the raising transmission line of electricity the air gap coverage for constituting above Fruit is good, and under identical clearance distance, line improves at least 15% to atural object the air gap coverage, between line the air gap effectively away from More than 30% is lifted from improving, enforcement is simple, add effect with stable, reliable no bad pair.
Embodiment described above only have expressed embodiments of the present invention, and its description is more concrete and detailed, but can not Therefore the restriction being interpreted as to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, Without departing from the inventive concept of the premise, some deformation can also be made and is improved, these belong to the protection model of the present invention Enclose.Therefore, the protection domain of patent of the present invention should be defined by claims.

Claims (7)

1. a kind of method for improving transmission line of electricity the air gap coverage, it is characterised in that comprise the following steps:
1) coating of coatings, in the groove between steel core and aluminum stranded conductor surface stock, coats at least three times PTV insulant, Per the minor tick regular hour, finally coat to certain thickness and conductive line surfaces are made in certain shape;
2) solidify, the wire that coating is completed is hung 20 hours~30 hours at normal temperatures, makes the wire of coating coatings complete All solidstate;
3) insulating sheath is wrapped up, and the two ends of insulating sheath possess projection and groove respectively, are respectively coated with RTV in raised and groove Insulant, raised and groove is closed up, and irrigates RTV insulant at the gap for closing up.
2. a kind of method for improving transmission line of electricity the air gap coverage according to claim 1, it is characterised in that:Step In rapid 1), the interval time be more than 20 minutes~50 minutes.
3. a kind of method for improving transmission line of electricity the air gap coverage according to claim 1, it is characterised in that:Step In rapid 2), the external diameter of the wire after solidification should be not less than the external diameter 1/5 of the wire before solidification.
4. a kind of method for improving transmission line of electricity the air gap coverage according to claim 1, it is characterised in that:Institute Sheath is stated for buckle-type.
5. a kind of method for improving transmission line of electricity the air gap coverage according to claim 4, it is characterised in that:Institute State raised mutually pressing with the groove to close up in hollow cylindrical.
6. a kind of method for improving transmission line of electricity the air gap coverage according to claim 1, it is characterised in that:Step In rapid 3), the insulating sheath is silicone rubber.
7. a kind of method for improving transmission line of electricity the air gap coverage according to claim 6, it is characterised in that:Institute The thickness for stating insulating sheath be not less than 2~5 millimeters.
CN201610859768.3A 2016-09-27 2016-09-27 A kind of method for improving transmission line of electricity the air gap coverage Active CN106448947B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112217184A (en) * 2020-10-19 2021-01-12 国网河北省电力有限公司检修分公司 Method for eliminating fault of substation 3/2 wiring protection dead zone

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101707342A (en) * 2009-11-17 2010-05-12 芜湖明远电线电缆有限责任公司 Cable head
CN202711808U (en) * 2012-05-08 2013-01-30 山东大学 Insulation-type carbon fiber composite core wire
JP2015118835A (en) * 2013-12-19 2015-06-25 株式会社オートネットワーク技術研究所 Insulated wire
CN204808983U (en) * 2015-07-30 2015-11-25 苏州沃尔兴电子科技有限公司 Buckle formula insulating sheath pipe
CN205050586U (en) * 2015-10-15 2016-02-24 安徽双诚电线电缆有限公司 Dampproofing and waterproofing aluminum alloy cable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101707342A (en) * 2009-11-17 2010-05-12 芜湖明远电线电缆有限责任公司 Cable head
CN202711808U (en) * 2012-05-08 2013-01-30 山东大学 Insulation-type carbon fiber composite core wire
JP2015118835A (en) * 2013-12-19 2015-06-25 株式会社オートネットワーク技術研究所 Insulated wire
CN204808983U (en) * 2015-07-30 2015-11-25 苏州沃尔兴电子科技有限公司 Buckle formula insulating sheath pipe
CN205050586U (en) * 2015-10-15 2016-02-24 安徽双诚电线电缆有限公司 Dampproofing and waterproofing aluminum alloy cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112217184A (en) * 2020-10-19 2021-01-12 国网河北省电力有限公司检修分公司 Method for eliminating fault of substation 3/2 wiring protection dead zone

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Effective date of registration: 20180612

Address after: 100000 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing

Co-patentee after: Hubei Electric Power Co., Ltd. maintenance company

Patentee after: State Grid Corporation of China

Co-patentee after: Hubei Chaoneng Electric Power Co., Ltd.

Address before: 430074 3, 60-65 two village, Wuli pier, Hanyang District, Wuhan, Hubei.

Patentee before: Hubei Super Power & Ultrahigh Pressure Electric Power Technology Development Co., Ltd.

TR01 Transfer of patent right