CN102129105B - Sectional-insulation single-point grounding operating method for OPGW optical cable - Google Patents
Sectional-insulation single-point grounding operating method for OPGW optical cable Download PDFInfo
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- CN102129105B CN102129105B CN 201110071831 CN201110071831A CN102129105B CN 102129105 B CN102129105 B CN 102129105B CN 201110071831 CN201110071831 CN 201110071831 CN 201110071831 A CN201110071831 A CN 201110071831A CN 102129105 B CN102129105 B CN 102129105B
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Abstract
The invention discloses a sectional-insulation single-point grounding operating method for an optical fiber composite overhead ground wire (OPGW) optical cable. In the method, the OPGW optical cable is divided into a plurality of long plate sections; a plurality of poles and towers are arranged in each long plate section of the OPGW optical cable; a basic pole and tower among the poles and towers is connected with the OPGW optical cable and is grounded through a pre-twisted wire clip; the remaining poles and towers are connected with the OPGW optical cable through suspension insulators; every two adjacent long plate sections are connected on a connection tower; two OPGW optical cables to be connected positioned on the two sides of the connection tower are respectively suspended on a ground wire cross arm of the connection tower through strain insulator strings; and the two OPGW optical cables are led to the cross section of the tower body of the connection tower through leading-down wire clips and are respectively connected into a connection box on the tower body of the connection tower for connecting. The method improves a conventional operating mode that an OPGW is grounded tower by tower on a transmission line, greatly reduces induced current loss, brings great economic benefits to an electric power system, and has a positive significance for constructing an energy-saving and environmentally-friendly transmission line.
Description
Technical field
The invention belongs to the ultra-high-tension power transmission line field, be specifically related to a kind of operation method of OPGW cable segment insulation single-point grounding.
Background technology
At present; China's high pressure, the most of method that adopts OPGW optical cable (Optical Fiber Composite Overhead Ground Wire, full name " Optical Fiber composite overhead Ground Wire ") and common ground wire to be used in conjunction with of extra high voltage network are protected transmission line of electricity.Common ground wire adopts the method for operation of graded insulation single-point grounding single-point grounding single-point grounding usually, and OPGW is its communication function of protection, and optical fiber can not disconnect, and can only adopt the method for operation by tower ground connection all the time.This method of operation by tower ground connection is to realize common shaft tower is interconnected by steel strand wires.
Under normal operation, around wire, can generate an electromagnetic field, between ground wire and wire, can produce electromagnetism and Electrostatic Field Coupling, because ground wire is generally unequal to the distance of each phase conductor, the mutual inductance between them just has difference.Therefore, on ground wire, induction produces longitudinal induction electromotive force and the electrostatic induction voltage distributed along the line.The OPGW optical cable has communication function concurrently because of it, adopts the mode by tower ground connection always, forms loop like this between OPGW optical cable and the earth, has for a long time energy loss in the OPGW optical cable.According to statistics, about 2,300,000 kilowatt hours of 500kV double-circuit line OPGW mono-annual loss consuming electric power.Therefore, change the method for operation of OPGW, make the induction current of wire on OPGW can't form loop, reducing faradic loss has very important meaning to transmission line of electricity.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the object of the invention is to propose a kind of operation method that can reduce the OPGW cable segment insulation single-point grounding of circulation loss.
The present invention is achieved by the following technical solution:
A kind of operation method of OPGW cable segment insulation single-point grounding, it is characterized in that: the OPGW optical cable is divided into to the long section of several dishes, have some shaft towers in the long section of each OPGW reel: in the middle of it, have a base shaft tower to be connected with the OPGW optical cable and ground connection by the preformed armor rods wire clamp, all the other shaft towers all are connected with the OPGW optical cable by suspension insulator; The long section of every two adjacent dishes is continued on the tower that continues, being positioned at the tower both sides of continuing two OPGW optical cables to be continued is suspended on the ground wire cross-arm of the tower that continues by strain insulator string respectively, through drop wire clip, two OPGW optical cables are caused to the tabula face place of the tower tower body that continues, and the splice tray that access is arranged on the tower tower body that continues is respectively continued.
Wherein, described drop wire clip is fixed on the tower body master material of the tower that continues, and described splice tray is fixed on the tabula face of the tower tower body that continues.
Wherein, the described tower that continues is the tangent tower that anchor support maybe can be continued.
Wherein, described splice tray comprises twisted wire stripper, welding unit, insulated part and protection gap portion; described welding unit comprises two upper and lower splicing boxs that are symmetricly set on the insulated part two ends; all be connected with a twisted wire stripper on each splicing box, described protection gap portion is connected with insulated part by anchor ear.
Wherein, described twisted wire stripper comprises wire clamp, sealing nut, hold-down nut and the sleeve that is sheathed on the wire clamp outside, the through hole that the inside of described wire clamp is provided with passage for clamping the OPGW optical cable and passes for the optical fiber I of OPGW optical cable, described wire clamp is fixed on the welding unit by hold-down nut, one end of described wire clamp is placed in outside, welding unit, its other end is placed in inside, welding unit, and the wire clamp end that is placed in inside, welding unit is provided with a sealing nut.
Wherein, the inside of described sleeve is arranged with for the fixing bolt of OPGW optical cable.
Wherein, the splicing box of described welding unit comprises the fine dish of box body, lid and collection, and the fine dish of described collection is fixed in box body by pillar, and the bottom centre place of described box body is provided with a confession and is embedded in the circular hole that the optical fiber II in insulated part passes through.
Wherein, described insulated part comprises hollow composite insulator and flange, in described hollow composite insulator, be embedded with the OPGW optical cable in the optical fiber I optical fiber II that carries out welding, described flange is fixed on the metalwork of the upper and lower both sides of hollow composite insulator through crimping, and flange is connected with two splicing boxs of welding unit by bolt.
Wherein, described protection gap portion comprises top electrode and bottom electrode, and described top electrode and bottom electrode are separately fixed on insulated part by anchor ear.
Wherein, described drop wire clip comprises insulator, wiring and steel tower fixed mount, and an end of described steel tower fixed mount is connected with the tower body master material of the tower that continues, its other end is connected with insulator, and described OPGW optical cable is fixed on insulator by wiring.
Beneficial effect of the present invention is: the method for operation of OPGW cable segment insulation single-point grounding has been improved traditional OPGW optical cable method of operation by tower ground connection on transmission line of electricity, greatly reduced the induction current loss, for electric system has brought huge economic benefit, and then played positive effect to building " energy-saving and environmental protection " type transmission line of electricity.
The accompanying drawing explanation
The structure principle chart of Fig. 1 operation method of the present invention;
Fig. 2 is the structural representation continued by the splice tray on the tower that continues;
Fig. 3 is the one-piece construction schematic diagram of splice tray;
Fig. 4 is the structural representation of twisted wire stripper;
Fig. 5 is the structural representation of welding unit;
Fig. 6 is the structural representation of insulated part;
Fig. 7 is the front view that the protection gap portion combines with insulated part;
Fig. 8 is the vertical view that the protection gap portion combines with insulated part;
Fig. 9 is the structural representation of drop wire clip;
Wherein, 1-OPGW optical cable (Optical Fiber composite overhead Ground Wire), the 2-tower that continues, 3-shaft tower, 4-suspension insulator, 5-strain insulator string, 6-splice tray, 7-drop wire clip, 8-tabula face, 9-ground wire cross-arm;
61-twisted wire stripper, 62-welding unit, the 63-insulated part, 64-protects gap, the 65-through hole, 66-wire clamp, 67-sealing nut, the 68-hold-down nut, 69-sleeve, 610-box body, the 611-lid, the fine dish of 612-collection, 613-hollow composite insulator, the 614-flange, 615-top electrode, 616-bottom electrode, 617-optical fiber I, 618-optical fiber II, 619-passage;
The 71-insulator, 72-wiring, 73-steel tower fixed mount.
Embodiment
Below in conjunction with accompanying drawing, operation method of the present invention is further described in detail.
The principle of operation method of the present invention as shown in Figure 1, this OPGW optical cable comprises the long section of some dishes, in the long section of a dish of OPGW, only there is a base shaft tower 3 directly to be connected and ground connection with OPGW optical cable 1 by common preformed armor rods wire clamp, the i.e. a of earth point shown in figure, all the other shaft towers 3 all are connected with OPGW optical cable 1 by suspension insulator 4.Like this, in the long section of a dish of OPGW, one point earth is only arranged, all the other put equal insulation against ground, and the induction current that wire produces on OPGW optical cable 1 just can't form loop, thereby has avoided circulation loss.
The long section of two dishes adjacent in such scheme is also insulated from each other, if two sections adjacent OPGW continue, rear outsourcing twisted wire still keeps conducting state, will between the earth point of two long sections of dish, form circulation so, can cause loss equally.Yet the OPGW optical cable has communication function concurrently, its inner optical fiber must guarantee that communication is unimpeded, therefore just need to use the technology that continues that insulate, between the long section of every two adjacent dishes, by the tower 2 that continues, continued, its technical scheme as shown in Figure 2, splice tray 6 is fixed on the tabula face 8 in the middle of tower 2 tower bodies that continue, the OPGW optical cable 1 that tower 2 both sides need to continue that continues is suspended on the ground wire cross-arm 9 of the tower 2 that continues by strain insulator string 5, arrive the tower body middle part of the tower 2 that continues through insulation drop wire clip 7, the OPGW optical cable 1 of tower 2 both sides of continuing accesses respectively the upper of insulating splice closure 6, in lower splicing box, continued.So, between the long section of two dishes of OPGW optical cable, guaranteed that optical fiber is unimpeded, made again outsourcing twisted wire (being the armor of OPGW) insulated from each other, for realizing the OPGW graded insulation single-point grounding single-point grounding method of operation, provide technical support.
Earth point a in the present invention should be selected on the shaft tower in the middle of the long section of each dish as far as possible.The induced potential of wire on OPGW optical cable 1 will raise with the increase of insulating point and earth point distance, and insulating point is far away apart from earth point, and the induced potential of its accumulation also will be higher.Therefore, earth point a is selected in to the induced potential that each centre of coiling long section can reduce the two ends insulating point.
The OPGW insulation fitting used in the present invention mainly contains suspension insulator 4, strain insulator string 5 and drop wire clip 7.Suspension insulator 4 and strain insulator string 5 are respectively used to shaft tower 3 and the tower 2 that continues, the tangent tower that the tower 2 that continues can maybe can be continued for anchor support; The tower of shaft tower 3 is restriction not, and tangent tower, anchor support or other type shaft tower all can.Be characterized in installing ground insulator additional in common OPGW preformed armor rods wire clamp, make OPGW optical cable and tower body insulation, on ground insulator, with the discharge prevention gap, can discharge lightning current or power system operation superpotential energy.The effect of drop wire clip 7 is the tower body insulation with the tower that continues by the downlead of OPGW optical cable 1 to be continued.
In the present invention, the characteristics of splice tray 6 are that upper and lower two splicing boxs are insulated from each other, and all with the tower 2 that continues, insulate, and optical fiber II 618 passes in the insulator 613 between upper and lower splicing box, realizes fibre junction.Upper and lower splicing box and continue, between tower 2, discharging gap is installed, avoid box body damaged by superpotential.
As shown in Figure 3, splice tray 6 mainly is comprised of four parts: twisted wire stripper 61, welding unit 62, insulated part 63 and protection gap 64, wherein welding unit 62 is divided into upper and lower two splicing boxs.
As shown in Figure 4, twisted wire stripper 61 comprises wire clamp 66, sealing nut 67, hold-down nut 68 and the sleeve 69 that is sheathed on wire clamp 66 outsides, the through hole 65 that the inside of wire clamp 66 is provided with passage 619 for clamping OPGW optical cable 1 and passes for the optical fiber I 617 of OPGW optical cable 1, wire clamp 66 is fixed on welding unit 62 by hold-down nut 68, outside, its other end that one end of wire clamp 66 is placed in welding unit 62 are placed in inside, welding unit, and the wire clamp end that is placed in inside, welding unit is provided with a sealing nut 67.The effect of twisted wire stripper 61 is that the optical fiber I 617 in the OPGW optical cable is peeled off out from the armor twisted wire, realizes the photodetachment purpose of armor twisted wire and optical fiber I.Wire clamp 66 passes from the box wall of box body 610, and fixing at the box body external application hold-down nut 68 of box body 610.OPGW optical cable 65 to be continued was first peeled off out by optical fiber I 617 before continuing, the end of armor is clamped by wire clamp 66, and OPGW optical cable 1 that will be to be continued by the bolt in sleeve 69 is firmly fixing, and the optical fiber I617 in the OPGW optical cable passes from wire clamp 66, enters splicing box inside.In installation process, wire clamp 66 and box body 610, wire clamp 66 and sealing nut 67, all have rubber washer between OPGW optical cable 1 and wire clamp 66, plays sealing function.
The effect of welding unit 62 are optical fiber I 617 of peeling off out in OPGW optical cable 1 with hollow composite insulator 613 in pre-buried optical fiber II 618 continued, and deposit remaining cable, guarantee fiber optic cable communications.The structural drawing of welding unit 62 as shown in Figure 5, it mainly is divided into upper and lower two splicing boxs, carry out welding to being positioned at the OPGW optical cable 1 that need to continue tower 2 both sides of continuing respectively, two splicing box symmetries are arranged on the two ends of insulated part 63, each splicing box comprises the fine dish 612 of box body 610, lid 611 and collection, the fine dish 612 of collection is placed in box body 610, the bottom centre of box body place is provided with a confession and is embedded in the circular hole that the optical fiber II 618 in insulated part 63 passes through, and the fine dish 612 of collection is for carrying out welding to optical fiber I and optical fiber II and depositing cable more than optical fiber.Be provided with two pillars in box body 610, the fine dish 612 of collection is fixed in box body 610 through two pillars, and box body 610 is bolted with lid 611, and the junction box surface is fluted, puts into packing ring during connection in groove, plays sealing function.The xsect of box body 610 can be regular polygon or circle.There is a circular hole in the bottom centre of box body, and the optical fiber II 618 optical fiber I 617 that from then on circular hole enters in the OPGW optical cable 1 that welding unit 62 is interior and to be continued be embedded in the hollow composite insulator is continued.
Insulated part 63 effect is by upper and lower splicing box insulation, make OPGW optical cable 1 at the position armor continued in state of insulation.Its structure as shown in Figure 6, insulated part 63 mainly is comprised of hollow composite insulator 613 and flange 614, be embedded with optical fiber II 618 in the hollow composite insulator, flange is fixed on the metalwork of the upper and lower both sides of hollow composite insulator through crimping, and flange is connected with two splicing boxs of welding unit 62 by bolt, interface is encased inside rubber, plays sealing effectiveness.Minimum arcing distance >=the 100mm of hollow composite insulator, the nominal creepage distance is chosen 250～500mm according to actual OPGW induced potential; The nominal height of hollow composite insulator is 100～200mm.Be embedded with 4m～6m optical fiber II 618 in hollow composite insulator 613.
The effect of drop wire clip 7 is the tower body insulation that make OPGW optical cable 1 and the tower 2 that continues, under the insulation that has realized optical cable is drawn.Its structure as shown in Figure 9, comprises insulator 71, wiring 72 and steel tower fixed mount 73, and this drop wire clip is arranged on the tower body master material of steel tower by the steel tower fixed mount.Steel tower fixed mount 73 is selected S sections tower fixed mount, one end of this S sections tower fixed mount is connected with the tower body master material of the tower 2 that continues by bolt, the end of tower body master material holds out against the middle bending part at S sections tower fixed mount, and the other end of S sections tower fixed mount is connected with the lower end of insulator 71 by bolt.The effect that insulator plays insulation and supports, can insulate the downlead of OPGW optical cable 1 and the tower body master material of the tower 2 that continues by insulator, thereby be convenient to realize the method for operation of OPGW cable segment insulation single-point grounding.Insulator 71 can be selected porcelain or composite insulator, and insulator is creepage than distance >=170mm, structure height >=200mm.OPGW optical cable 1 is fixed on the upper end of insulator 71 by omnipotent wiring 72, be surrounded by optical fiber in armor due to OPGW optical cable 1, so the OPGW optical cable should not be used nonflexible line clamping fixed, therefore the present invention adopts wiring 72 that the OPGW optical cable is fixed on insulator, be that optical cable has obtained fixing like this, avoided again optical cable to sustain damage simultaneously.
When the present invention normally moves at transmission line of electricity, OPGW optical cable 1, in state of insulation, can not produce circulation loss.When circuit is struck by lightning or the fault such as be short-circuited, the discharging gap on insulation fitting (mainly containing suspension insulator 4, strain insulator string 5 and drop wire clip 7) and splice tray 6 is breakdown, and lightning current or superpotential are released.After fault, discharging gap recovers electric off-state, and the OPGW optical cable reenters normal operating condition.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of this claim scope.
Claims (5)
1. the operation method of OPGW cable segment insulation single-point grounding, it is characterized in that: the OPGW optical cable is divided into to the long section of several dishes, have some shaft towers (3) in the long section of each OPGW reel: in the middle of it, have a base shaft tower to be connected with OPGW optical cable (1) and ground connection by the preformed armor rods wire clamp, all the other shaft towers all are connected with OPGW optical cable (1) by suspension insulator (4); The long section of every two adjacent dishes is continued on the tower that continues (2), being positioned at the tower that continues (2) both sides two OPGW optical cables (1) to be continued is suspended on the ground wire cross-arm (9) of the tower that continues (2) by strain insulator string (5) respectively, the tabula face (8) that two OPGW optical cables (1) is caused to the tower that continues (2) tower body through drop wire clip (7) is located, and the splice tray (6) that access is arranged on the tower that continues (2) tower body is respectively continued;
Described splice tray (6) comprises twisted wire stripper (61), welding unit (62), insulated part (63) and protection gap portion (64), described welding unit comprises two upper and lower splicing boxs that are symmetricly set on the insulated part two ends, all be connected with a twisted wire stripper on each splicing box, described protection gap portion is connected with insulated part by anchor ear;
Described twisted wire stripper (61) comprises wire clamp (66), sealing nut (67), hold-down nut (68) and the sleeve (69) that is sheathed on wire clamp (66) outside, the inside of described wire clamp (66) be provided with passage (619) for clamping OPGW optical cable (1) and for the optical fiber I(617 of OPGW optical cable (1)) through hole (65) that passes, described wire clamp (66) is fixed on welding unit (62) by hold-down nut (68), one end of described wire clamp (66) is placed in outside, welding unit, its other end is placed in inside, welding unit, the wire clamp end that is placed in inside, welding unit is provided with a sealing nut (67),
The splicing box of described welding unit (62) comprises box body (610), lid (611) and the fine dish of collection (612), the fine dish of described collection is fixed in box body by pillar, and the bottom centre place of described box body is provided with a confession and is embedded in the optical fiber II(618 in insulated part (63)) circular hole that passes through;
Described insulated part (63) comprises hollow composite insulator (613) and flange (614), in described hollow composite insulator, be embedded with OPGW optical cable (1) in optical fiber I(617) the optical fiber II(618 that carries out welding), described flange is fixed on the metalwork of the upper and lower both sides of hollow composite insulator through crimping, and flange is connected with two splicing boxs of welding unit (62) by bolt;
Described protection gap portion (64) comprises top electrode (615) and bottom electrode (616), and described top electrode and bottom electrode are separately fixed on insulated part (63) by anchor ear.
2. the operation method of OPGW cable segment as claimed in claim 1 insulation single-point grounding, it is characterized in that: described drop wire clip (7) is fixed on the tower body master material of the tower that continues (2), and described splice tray (6) is fixed on the tabula face (8) of the tower that continues (2) tower body.
3. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 1, is characterized in that: the tangent tower that the described tower that continues (2) maybe can be continued for anchor support.
4. the operation method of OPGW cable segment as claimed in claim 1 insulation single-point grounding is characterized in that: the inside of described sleeve (69) is arranged with for the fixing bolt of OPGW optical cable (1).
5. the operation method of OPGW cable segment as claimed in claim 2 insulation single-point grounding, it is characterized in that: described drop wire clip (7) comprises insulator (71), wiring (72) and steel tower fixed mount (73), one end of described steel tower fixed mount is connected with the tower body master material of the tower that continues (2), its other end is connected with insulator, and described OPGW optical cable (1) is fixed on insulator by wiring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110071831 CN102129105B (en) | 2011-03-24 | 2011-03-24 | Sectional-insulation single-point grounding operating method for OPGW optical cable |
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| CN 201110071831 CN102129105B (en) | 2011-03-24 | 2011-03-24 | Sectional-insulation single-point grounding operating method for OPGW optical cable |
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| CN102129105B true CN102129105B (en) | 2013-12-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102692309B (en) * | 2012-05-10 | 2014-12-10 | 南方电网科学研究院有限责任公司 | Power transmission line wind tunnel test system and method applied to typhoon field |
| CN102780194B (en) * | 2012-07-06 | 2015-03-18 | 广东电网公司电力科学研究院 | Loss reducing method for overhead ground wire of double circuit electric transmission line on the same tower |
| CN103779821A (en) * | 2014-02-19 | 2014-05-07 | 国家电网公司 | Method and circuit structure for lowering corrosion to tower footings and grounding devices from direct current grounding electrode |
| CN115308867B (en) * | 2022-10-09 | 2023-01-06 | 长飞光纤光缆股份有限公司 | Leading-down piece of OPGW and method for leading-down insulated optical unit by adopting leading-down piece |
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| US5970199A (en) * | 1996-12-11 | 1999-10-19 | Act Communications, Inc. | Frame for supporting fiber optic cable splices |
| CN101174011A (en) * | 2007-12-03 | 2008-05-07 | 国网武汉高压研究院 | Earthing mode of optical fiber compound overhead ground wire and earthing pilot arc clearance |
| CN201549859U (en) * | 2009-12-04 | 2010-08-11 | 西北电网有限公司 | Grounded system of high-tension transmission line |
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- 2011-03-24 CN CN 201110071831 patent/CN102129105B/en active Active
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|---|---|---|---|---|
| US5970199A (en) * | 1996-12-11 | 1999-10-19 | Act Communications, Inc. | Frame for supporting fiber optic cable splices |
| CN101174011A (en) * | 2007-12-03 | 2008-05-07 | 国网武汉高压研究院 | Earthing mode of optical fiber compound overhead ground wire and earthing pilot arc clearance |
| CN201549859U (en) * | 2009-12-04 | 2010-08-11 | 西北电网有限公司 | Grounded system of high-tension transmission line |
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| Title |
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