CN102129105A - 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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- CN102129105A CN102129105A CN2011100718314A CN201110071831A CN102129105A CN 102129105 A CN102129105 A CN 102129105A CN 2011100718314 A CN2011100718314 A CN 2011100718314A CN 201110071831 A CN201110071831 A CN 201110071831A CN 102129105 A CN102129105 A CN 102129105A
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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 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 the normal operation, can generate an electromagnetic field around the lead, can produce electromagnetism and electrostatic field coupling between ground wire and the lead, because ground wire is generally unequal to the distance of each phase conductor, the mutual inductance between them just has difference.Therefore, induction produces longitudinal induction electromotive force and the electrostatic induction voltage that distributes along the line on ground wire.The OPGW optical cable has communication function concurrently because of it, adopts the mode by tower ground connection always, forms the loop like this between OPGW optical cable and the earth, has energy loss in the OPGW optical cable midium or long term.According to statistics, about 2,300,000 kilowatt hours of 500kV double-circuit line OPGW one annual loss consuming electric power.Therefore, change the method for operation of OPGW, make the induction current of lead on OPGW can't form the loop, reducing faradic loss has very important meaning to transmission line of electricity.
Summary of the invention
In order to overcome the above-mentioned defective of prior art, the objective 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 the long section of several dishes, have some shaft towers in the long section of each OPGW reel: have a basic shaft tower to be connected with the OPGW optical cable and ground connection by the preformed armor rods wire clamp in the middle of it, all the other shaft towers all link to each other with the OPGW optical cable by suspension insulator; The long section of per two adjacent dishes continues 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 the tabula face place of the Tata body that continues, and insert respectively and be arranged in the Tata splice tray on one's body that continues and continue.
Wherein, described drop wire clip is fixed on the body of the tower master material of the tower that continues, and described splice tray is fixed on the tabula face of the Tata body that continues.
Wherein, the described tower that continues is the tangent tower that anchor support maybe can continue.
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 the passage that is used for clamping 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 places outside, welding unit, its other end to place inside, welding unit, places the wire clamp end of inside, welding unit to be provided with a sealing nut.
Wherein, the inside of described sleeve is arranged with the bolt that is used for fixing the 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 the 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 the insulated part passes through.
Wherein, described insulated part comprises hollow composite insulator and flange, be embedded with in the described hollow composite insulator 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 the insulated part by anchor ear.
Wherein, described drop wire clip comprises insulator, wiring and iron tower fixed mount, and an end of described iron tower fixed mount is connected with the body of the tower master material of the tower that continues, its other end is connected with insulator, and described OPGW optical cable is fixed on the 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.
Description of drawings
The structure principle chart of Fig. 1 operation method of the present invention;
Fig. 2 is the structural representation that continues by the splice tray on the tower that continues;
Fig. 3 is the one-piece construction synoptic 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 the 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-iron 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 basic 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 the figure, all the other shaft towers 3 all link to each other 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 lead produces on OPGW optical cable 1 just can't form the loop, thereby has avoided circulation loss.
The long section of two dishes adjacent in the such scheme is also insulated from each other, and twisted wire still keeps conducting state if two neighboring sections OPGW continues the back outsourcing, will form circulation between the earth point of two long sections of dish 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, continue by the tower 2 that continues between the long section of per two adjacent dishes, its technical scheme as shown in Figure 2, splice tray 6 is fixed on the middle tabula face 8 of tower 2 bodies of the tower that continue, the OPGW optical cable 1 that tower 2 both sides need 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 body of the tower 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 inserts respectively the splice tray 6 that insulate on, continue in the following splicing box.So, guaranteed that promptly optical fiber is unimpeded between the long section of two dishes of OPGW optical cable, made outsourcing twisted wire (being the armor of OPGW) insulated from each other again, provide technical support for realizing the OPGW graded insulation single-point grounding single-point grounding method of operation.
Earth point a among the present invention should be selected on the middle shaft tower of the long section of each dish as far as possible.The induced potential of lead on OPGW optical cable 1 will raise with the increase of insulating point and earth point distance, and promptly insulating point is far away more apart from earth point, and the induced potential of its accumulation also will be high more.Therefore, earth point a is selected in the induced potential that each centre of coiling long section can reduce the two ends insulating point.
The OPGW insulation gold utensil that uses among 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 applied for shaft tower 3 and the tower 2 that continues, the tangent tower that the tower 2 that continues can maybe can continue for anchor support; The tower of shaft tower 3 without limits, tangent tower, anchor support or other type shaft tower all can.Be characterized in common OPGW preformed armor rods wire clamp, installing the ground wire insulator additional, make the insulation of OPGW optical cable and body of the tower, have the discharge prevention gap on the ground wire insulator, can discharge lightning current or power system operation superpotential energy.The effect of drop wire clip 7 is the body of the tower insulation with downlead with the tower that continues of OPGW optical cable 1 to be continued.
The characteristics of splice tray 6 are that two splicing boxs are insulated from each other up and down among the present invention, and all insulate with the tower 2 that continues, and optical fiber II 618 realizes fibre junction from passing in the insulator 613 between the splicing box up and down.Splicing box and continue and between the tower 2 discharging gap is installed avoids box body damaged by superpotential up and down.
As shown in Figure 3, splice tray 6 mainly is made up of four parts: twisted wire stripper 61, welding unit 62, insulated part 63 and protection gap 64, wherein welding unit 62 is divided into two splicing boxs up and down.
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 the passage 619 that is used 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 the welding unit 62 by hold-down nut 68, one end of wire clamp 66 places outside, its other end of welding unit 62 to place inside, welding unit, places the wire clamp end of inside, welding unit to be 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 peeled off out with optical fiber I 617 earlier before continuing, the end of armor is clamped by wire clamp 66, and by the bolt in the sleeve 69 will be to be continued OPGW optical cable 1 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 the wire clamp 66, play sealing function.
The effect of welding unit 62 are optical fiber I of peeling off out in the OPGW optical cable 1 617 with hollow composite insulator 613 in pre-buried optical fiber II 618 continue, and deposit surplus cable, guarantee fiber optic cable communications.The structural drawing of welding unit 62 as shown in Figure 5, it mainly is divided into two splicing boxs up and down, carry out welding to being positioned at the OPGW optical cable 1 that need continue tower 2 both sides of continuing respectively, two splicing box symmetries are installed in 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 places in the box body 610, the bottom centre place of box body is provided with a confession and is embedded in the circular hole that the optical fiber II 618 in the insulated part 63 passes through, and the fine dish 612 of collection is used for optical fiber I and optical fiber II are carried out welding and deposit the surplus cable of optical fiber.Be provided with two pillars in the box body 610, the fine dish of collection 612 is fixed in the box body 610 through two pillars, and box body 610 and lid 611 are connected by bolt, and the junction box surface is fluted, puts into packing ring during connection in the 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, be embedded in the hollow composite insulator optical fiber II 618 from then on circular hole enter in the welding unit 62 with OPGW optical cable 1 to be continued in optical fiber I 617 continue.
Insulated part 63 effects are with splicing box insulation up and down, make OPGW optical cable 1 be in state of insulation at the position armor that continues.Its structure as shown in Figure 6, insulated part 63 mainly is made up 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 the hollow composite insulator 613.
The effect of drop wire clip 7 is that the OPGW optical cable 1 and the body of the tower of the tower 2 that continues are insulated, and has realized that the insulation of optical cable is drawn down.Its structure comprises insulator 71, wiring 72 and iron tower fixed mount 73 as shown in Figure 9, and this drop wire clip is installed on the body of the tower master material of iron tower by the iron tower fixed mount.Iron tower fixed mount 73 is selected S sections tower fixed mount for use, one end of this S sections tower fixed mount is connected with the body of the tower master material of the tower 2 that continues by bolt, the end of body of the tower 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 by the lower end of bolt with insulator 71.The effect that insulator plays insulation and supports can be insulated the downlead of OPGW optical cable 1 and the body of the tower master material of the tower 2 that continues by insulator, thereby is convenient to realize the method for operation of OPGW cable segment insulation single-point grounding.Insulator 71 can be selected porcelain or composite insulator for use, 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, owing to be surrounded by optical fiber in the armor of OPGW optical cable 1, so the OPGW optical cable should not use the nonflexible line clamping fixed, so the present invention adopts wiring 72 that the OPGW optical cable is fixed on the insulator, be that optical cable has obtained fixing like this, avoided optical cable to sustain damage again simultaneously.
When the present invention normally moved at transmission line of electricity, OPGW optical cable 1 was in state of insulation, can not produce circulation loss.When circuit was struck by lightning or fault such as be short-circuited, the discharging gap on insulation gold utensil (mainly containing suspension insulator 4, strain insulator string 5 and drop wire clip 7) and the splice tray 6 was breakdown, and lightning current or superpotential are released.After the fault, discharging gap recovers electric off-state, and the OPGW optical cable reenters normal operating condition.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the field are to be understood that: still can make amendment 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 (10)
1. the operation method of OPGW cable segment insulation single-point grounding, it is characterized in that: the OPGW optical cable is divided into the long section of several dishes, have some shaft towers (3) in the long section of each OPGW reel: have a basic shaft tower to be connected with OPGW optical cable (1) and ground connection by the preformed armor rods wire clamp in the middle of it, all the other shaft towers all link to each other with OPGW optical cable (1) by suspension insulator (4); The long section of per two adjacent dishes continues 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, through drop wire clip (7) the tabula face (8) that two OPGW optical cables (1) cause the tower that continues (2) body of the tower is located, and inserted the splice tray (6) that is arranged on the tower that continues (2) body of the tower respectively and continue.
2. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 1, it is characterized in that: described drop wire clip (7) is fixed on the body of the tower 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) body of the tower.
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 continue for anchor support.
4. as the operation method of the arbitrary described OPGW cable segment insulation of claim 1-3 single-point grounding; it is characterized in that: 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.
5. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 4, it is characterized in that: 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 through hole (65) that the inside of described wire clamp (66) is provided with the passage (619) that is used for clamping OPGW optical cable (1) and passes for the optical fiber I (617) of OPGW optical cable (1), described wire clamp (66) is fixed on the welding unit (62) by hold-down nut (68), one end of described wire clamp (66) places outside, welding unit, its other end places inside, welding unit, places the wire clamp end of inside, welding unit to be provided with a sealing nut (67).
6. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 5, it is characterized in that: the inside of described sleeve (69) is arranged with the bolt that is used for fixing OPGW optical cable (1).
7. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 4, it is characterized in that: 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 the 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 (618) in the insulated part (63) passes through.
8. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 4, it is characterized in that: described insulated part (63) comprises hollow composite insulator (613) and flange (614), be embedded with in the described hollow composite insulator 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.
9. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 4; it is characterized in that: described protection gap portion (64) comprises top electrode (615) and bottom electrode (616), and described top electrode and bottom electrode are separately fixed on the insulated part (63) by anchor ear.
10. the operation method of OPGW cable segment insulation single-point grounding as claimed in claim 2, it is characterized in that: described drop wire clip (7) comprises insulator (71), wiring (72) and iron tower fixed mount (73), one end of described iron tower fixed mount is connected with the body of the tower master material of the tower that continues (2), its other end is connected with insulator, and described OPGW optical cable (1) is fixed on the insulator by wiring.
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| CN102780194A (en) * | 2012-07-06 | 2012-11-14 | 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 |
| CN115308867A (en) * | 2022-10-09 | 2022-11-08 | 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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| CN102692309A (en) * | 2012-05-10 | 2012-09-26 | 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 |
| 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 |
| CN102780194A (en) * | 2012-07-06 | 2012-11-14 | 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 |
| 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 |
| CN115308867A (en) * | 2022-10-09 | 2022-11-08 | 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 |
| 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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