CN217113936U - Insulating optical unit optical fiber composite overhead ground wire and overhead transmission line comprising same - Google Patents
Insulating optical unit optical fiber composite overhead ground wire and overhead transmission line comprising same Download PDFInfo
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- CN217113936U CN217113936U CN202220526442.XU CN202220526442U CN217113936U CN 217113936 U CN217113936 U CN 217113936U CN 202220526442 U CN202220526442 U CN 202220526442U CN 217113936 U CN217113936 U CN 217113936U
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Abstract
The utility model discloses an insulating optical unit optical fiber composite overhead ground wire and an overhead transmission line comprising the same, which comprises a first insulating optical unit, a second insulating optical unit and a plurality of metal single wires, wherein the first insulating optical unit comprises a first insulating sleeve and a sensing optical fiber; the second insulating optical unit comprises a second insulating sleeve and a communication optical fiber, the materials of the first insulating sleeve and the second insulating sleeve are selected from PTEE, ETFE or PEEK, and the second insulating sleeve is filled with fiber paste. The insulating sleeve of the insulating light unit of the utility model has excellent performances of high insulation, high temperature resistance, high strength, heat insulation and the like, and improves the thermal capacity and the short-circuit current performance; after the insulating optical unit optical fiber composite overhead ground wire is subjected to electric/optical separation on the power pole tower, the lower end of the power pole tower is uncharged, and the whole-process insulating single-point grounding is adopted, so that the line loss of a power transmission line is greatly reduced, the energy consumption and the ice melting are reduced; and according to different monitored objects, real-time monitoring is realized by adopting corresponding optical fibers and measurement technologies.
Description
Technical Field
The utility model belongs to the technical field of power communication transmission network, more specifically relates to compound overhead earth wire of insulating light unit optic fibre and contain its overhead transmission line.
Background
An Optical-fiber Composite Overhead Ground Wire (OPGW) is a main component of a power communication transmission network. The optical fiber communication overhead ground wire is hung on the top of an electric power tower, has the basic attribute of an overhead ground wire containing communication optical fibers, and has double functions of optical communication and the traditional overhead ground wire. In addition to its use for communication, its main functions are to carry short circuit currents in case of power system failure and to bleed lightning currents, when this happens, the OPGW generates short time high temperatures.
The OPGW is composed of an insulated optical unit for signal transmission and a metal stranded wire for carrying and conducting. The current technology is one in which the insulated optical unit is made of a stainless steel sleeve containing the communication optical fiber and a filled water-blocking compoundAnd aluminum, etc., collectively referred to as metal-insulated optical units. These metal-insulated optical units are both heat conductors and will quickly transfer the temperature of the metal stranded wires to the optical fibers, limiting the thermal capacity (I) of the OPGW 2 t) and maximum operating temperature; and the conductive body is at the same electrical potential as the metal stranded wire. However, since the electronic potentials of the different types of metal stranded wires in contact with the metal stranded wires are different, electrochemical corrosion can occur under severe weather conditions.
For a long time, in order to protect the relatively fragile optical fiber, it is known to ground the metal-insulated optical unit OPGW base-by-base tower (referred to as tower-by-tower grounding). The device is used for discharging continuous induction current generated by the metal stranded wire in the electromagnetic field of the transmission line so as to reduce the working temperature and introduce lightning current which is possible to be struck by lightning into the ground.
Theoretical calculation and practical application show that the OPGW grounded by tower causes large line loss to the power transmission line and invisibly increases carbon emission. There is data indicating that OPGW grounded tower by tower in ac lines causes line losses of about one to two thousandths. This is not a small number for the OPGW built on a large scale in our country. And because of tower-by-tower grounding, OPGW cannot perform through-flow ice melting as conventional wires and ground wires.
In order to save energy, reduce consumption and melt ice by the OPGW, the enterprise standard (Q/GWD 11590 technical Specification for design of overhead power cable line) published by the national grid company in 2016 defines that the OPGW of 500kV and above lines is suitable for adopting an insulation mode. In the prior art, a hardware fitting for grounding an OPGW, a down lead part and a junction box are isolated from a tower through an insulation string.
The insulated OPGW changes from "grounded" to "charged". The insulating method of the down conductor part and the closure described above is very low in reliability. The accidents of arc burning, breakdown, burning loss and the like frequently occur. Impact is caused to the stable operation of the power communication network, the threat to the safe and reliable power transmission of the power network is formed, and the danger is formed to the personal safety of operation and maintenance personnel. For this reason, since the metal insulated optical unit and the metal twisted wire have the same potential, the charging of the insulated optical unit in the conventional OPGW is a main factor.
In recent years, with the progress of optical fiber sensing technology, the multi-functionalization of OPGW has been proposed. Besides communication, the demand of optical fibers in the cable for online distributed real-time detection of parameters such as strain, temperature, vibration, lightning stroke, waving, ice coating and the like of the OPGW is pressing.
The insulated optical unit for communication generally adopts conventional communication optical fiber, and requires a larger excess length of optical fiber; the insulated optical unit for sensing needs special sensing optical fiber besides the conventional optical fiber, and usually requires a smaller excess length of optical fiber. That is, the requirements of these two types of insulating optical units are not completely the same, and depending on the object to be monitored, it may be necessary to arrange a plurality of insulating optical units. When a plurality of insulated optical units are needed, the weight of the insulated optical unit is desirably as small as possible to reduce the self weight of the OPGW, while the existing conventional metal sleeve insulated optical unit has a large weight and does not meet the energy-saving requirement.
SUMMERY OF THE UTILITY MODEL
To the above defect or improvement demand of prior art, the utility model provides an insulating light unit optical fiber composite overhead ground wire and contain its overhead transmission line, the insulating sleeve of insulating light unit adopts the macromolecular material of high insulation, high temperature resistant, high strength, but insulating light unit short-term (about 4s) bear about 300 ℃ high temperature and the performance keeps unchanged. The thermal stability of the traditional OPGW is improved under the condition of the same structure and bearing sectional area, and the thermal capacity and short-circuit current of the optical fiber composite overhead ground wire of the insulated optical unit are obviously improved.
To achieve the above object, according to one aspect of the present invention, there is provided an insulated optical unit optical fiber composite overhead ground wire, comprising a first insulated optical unit, a second insulated optical unit and a plurality of metal single wires, wherein the second insulated optical unit and the plurality of metal single wires are twisted around the first insulated optical unit to form a multi-layer twisted layer, wherein:
the first insulating light unit comprises a first insulating sleeve and a sensing optical fiber arranged in the first insulating sleeve, and the material of the first insulating sleeve is selected from PTEE, ETFE or PEEK;
the second insulating optical unit comprises a second insulating sleeve and a communication optical fiber arranged in the second insulating sleeve, the second insulating sleeve is made of PTEE, ETFE or PEEK, and the second insulating sleeve is filled with fiber paste.
Preferably, the extra length of the communication optical fiber in the second insulating sleeve is 0.2% -0.3%.
Preferably, the sensing optical fiber has a plurality for detecting strain, temperature, vibration and ice coating.
Preferably, the sensing fiber for detecting strain has an extra length of 0.1% to 0.2%, and the sensing fiber for detecting temperature, vibration and ice coating has an extra length of 0.2% to 0.3%.
Preferably, the twisted layer has three or more layers, and the second insulating light unit is located at a second outer layer.
Preferably, the second insulated light unit is provided with a plurality of pieces.
Preferably, the metal single wire is a galvanized steel wire, an aluminum-clad steel wire, an electrical aluminum wire or an aluminum alloy wire.
According to the utility model discloses a another aspect still provides overhead transmission line, include insulating light unit optical fiber composite overhead ground wire, its characterized in that still includes strain insulator preformed armor rod gold utensil, shaft tower, photoelectric separator, insulator string and splice box, insulator string has discharge gap, wherein:
the insulating optical unit optical fiber composite overhead ground wire is clamped by the strain pre-twisted wire hardware fitting, the strain pre-twisted wire hardware fitting is connected with the insulator string, and the insulator string is connected with a first grounding point at the top of the tower;
the photoelectric separator comprises an insulating cylinder, an upper metal end cover and a lower metal end cover, wherein the upper metal end cover and the lower metal end cover are respectively arranged at the upper end and the lower end of the insulating cylinder, the upper metal end cover and the lower metal end cover are respectively provided with a through hole, and the lower metal end cover is connected with a second grounding point of the tower;
the optical cable splice box is connected with a third grounding point of the tower;
the end of the cut metal single wire is connected with the upper metal end cover, the first insulating optical unit and the second insulating optical unit penetrate through the photoelectric separator and then are connected with the optical cable junction box, and the photoelectric separator is respectively connected with the first insulating optical unit and the second insulating optical unit in a sealing mode so as to prevent rainwater from entering the insulating cylinder.
Preferably, the tower further comprises a residual cable frame for storing redundant insulated optical units, and the residual cable frame is connected with a fourth grounding point and a fifth grounding point of the tower.
Preferably, the parts of the first insulating light unit and the second insulating light unit outside the photoelectric separator are sleeved with sleeves for water prevention.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1) the utility model discloses a compound overhead earth wire of insulating optical unit optic fibre, the insulation support of insulating optical unit is made by PTFE, ETFE, PEEK this type high insulation, high strength, high temperature resistant, the macromolecular material that has certain heat-proof quality performance, and its density is about 1/3 of stainless steel sleeve commonly used, has reduced the cable dead weight to can effectively save energy.
2) The utility model discloses a compound overhead earth wire of insulating optical unit optic fibre, insulating optical unit's insulating sleeve's high insulation, high strength performance can directly draw down and continue with the ground potential along the shaft tower with insulating optical unit after carrying out photoelectric separation on shaft tower upper portion, thereby draw hypomere and splice closure needn't adopt again with the insulator arrangement of ground potential isolation to guarantee fortune dimension personnel's personal safety.
3) The utility model discloses a compound overhead earth wire of insulating optical unit optic fibre, insulating optical unit's insulating sleeve's high temperature resistant and heat-proof quality can improve the highest short-time operating temperature from usual 200 ℃ to more than 250 ℃, have improved IOPGW's thermal capacity, can bear bigger short-circuit current under the conducting area the same with conventional metal insulation optical unit OPGW.
4) The utility model discloses a compound overhead earth wire of insulating optical unit optic fibre can set up the insulating optical unit that one to a plurality of different grade type optic fibre and different excess length required to satisfy different multi-functional requirements.
5) The utility model discloses an overhead transmission line, the insulating light unit optical fiber composite overhead ground wire sectional insulation single-point ground at shaft tower top to consumption reduction and energy saving.
Drawings
Fig. 1 is a schematic diagram of an insulated optical unit optical fiber composite overhead ground wire of the present invention using an aluminum-clad steel wire;
fig. 2 is a schematic diagram of an overhead transmission line of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, an Insulated Optical unit Optical fiber Composite Overhead Ground Wire (IOPGW) has a basic structure of a concentric twisted round Wire or a concentric twisted Wire, and includes a first Insulated Optical unit 1, a second Insulated Optical unit 2, and a plurality of metal single wires 8, where the second Insulated Optical unit 2 and the metal single wires 8 are twisted around the first Insulated Optical unit 1 to form a multi-layer twisted layer, where:
the first insulating light unit 1 comprises a first insulating sleeve 3 and a sensing optical fiber 4 arranged in the first insulating sleeve 3, wherein the material of the first insulating sleeve 3 is selected from PTEE, ETFE or PEEK; the sensing fiber 4 is preferably provided with a plurality of fibers for detecting strain, temperature, vibration and icing. The first insulating light unit 1 is located at a central position to facilitate the inspection work.
The second insulating optical unit 2 comprises a second insulating sleeve 5 and communication optical fibers 6 arranged in the second insulating sleeve 5, the second insulating sleeve 5 is made of materials selected from PTEE, ETFE or PEEK, a fiber paste 7 is filled in the second insulating sleeve 5, and the second insulating optical unit 2 is provided with a plurality of fibers so as to facilitate efficient communication. The twisted layer is preferably provided with three layers, the second insulated light unit 2 being located in the second outer layer.
The metal single wire 8 can adopt round wires or molded wires meeting the strength and the conductive requirements, such as galvanized steel wires, aluminum-clad steel wires, electrical aluminum wires or aluminum alloy wires, and the like, and a plurality of layers of stranded layers are stranded on the first insulating optical unit 1 serving as the central core layer according to a certain rule to form a bare stranded wire. Each stranded wire or each stranded layer can be the same metal single wire 8 or the mixture of different metal single wires 8. One or more insulating optical units are distributed in the center or among the stranded layers inside the outermost stranded layer of the bare stranded wire and are synchronously stranded with the metal single wire 8, and the outermost stranded layer is in the right direction. Referring to fig. 1, a core layer at the center is a first insulating optical unit 1, a plurality of stranded layers are stranded outside the core layer, a first stranded layer, a second stranded layer and a third stranded layer are arranged from inside to outside, and metal single wires 8 of the first stranded layer, the second stranded layer and the third stranded layer can all adopt aluminum-clad steel wires or the outermost layer can adopt aluminum alloy wires. The second outer layer also has an insulated light unit.
The utility model discloses a IOPGW can set up the insulating optical unit that a plurality of different grade type optic fibre and different excess lengths required.
The second insulated optical unit 2 for communication is generally stranded together with the metal single wire 8, the remaining length of the communication optical fiber 6 is 0.2% -0.3%, and the sleeve is filled with the fiber paste 7.
The special insulating optical unit for strain sensing can adopt a high-strength tightly-packed optical fiber which is usually arranged in the center of a stranded wire structure, the excess length of the optical fiber is 0.1-0.2%, and high-temperature fiber paste 7 can be filled in the tube or the fiber paste 7 is not filled in the tube. The rest first insulating optical units 1 for detecting parameters such as temperature, vibration, ice coating and the like can adopt related sensing optical fibers 4 which are usually stranded together with metal single wires 8, the residual length of the optical fibers is 0.2-0.3%, high-temperature fiber paste 7 can be filled in the tubes or the fiber paste 7 is not filled in the tubes, and different optical fibers are configured according to required functions, so that different multifunctional requirements are met.
The insulating optical unit for communication mainly adopts G.652, G.654, G.657 optical fibers and the like, including ultra-low loss (ULL) and small outer diameter (less than or equal to 200 mu m) optical fibers, and the optical fibers can also be used for sensing; the insulated optical unit for sensing can adopt a conventional optical fiber or a sensing special optical fiber, including but not limited to various sensing special optical fibers sensitive to strain, temperature, vibration and the like, high-strength, high-temperature-resistant, fatigue-resistant and the like and tightly-packed optical fibers thereof. The requirements of the sensing fiber 4 are not completely consistent with those of the communication fiber 6 according to different application scenarios, i.e. the requirements of the communication insulated optical unit and the sensing insulated optical unit are not completely the same. It is sometimes necessary to arrange a plurality of insulated light units at different locations of the cable structure and to employ corresponding detection techniques. Table 1 lists the different functional requirements for the type of optical fibre, the location of the insulated optical unit in the cable structure and the currently available detection techniques.
TABLE 1 position requirement table for different function requirements on insulated light unit
Compared with the optical unit adopting the metal sleeve, the insulating optical unit of the utility model can bear the high temperature of about 300 ℃ in a short time (about 4s) and the performance is kept unchanged. The thermal stability of the traditional OPGW is improved under the condition of the same structure and bearing sectional area. As can be seen from table 2, the heat capacity and short circuit current of IOPGW are significantly improved.
TABLE 2 comparison of conventional OPGW and IOPGW performance
The utility model discloses energy-saving insulating optical unit optical fiber composite overhead ground wire 11 except being used for communication, still can be used to online distributed real-time detection IOPGW and meet an emergency, temperature, vibration, thunderbolt, wave, cover ice isoparametric.
A typical application of the insulated optical unit optical fiber composite overhead ground wire 11 of the present invention is shown in fig. 2.
As shown in fig. 2, according to another aspect of the present invention, there is provided an overhead transmission line, including the insulated optical unit optical fiber composite overhead ground wire 11, further including the strain pre-twisted wire hardware 12, the tower 19, the photoelectric separator 14, the insulator string 13 and the splice box 18, the insulator string 13 has a discharge gap, wherein:
the insulating optical unit optical fiber composite overhead ground wire 11 is clamped by the strain pre-twisted wire fitting 12, the strain pre-twisted wire fitting 12 is connected with the insulator string 13, the insulator string 13 is connected with a first grounding point 171 on the tower 19, and the first grounding point 171 is preferably arranged at the top of the tower 19;
the photoelectric separator 14 comprises an insulating cylinder, an upper metal end cover and a lower metal end cover, wherein the upper metal end cover and the lower metal end cover are respectively arranged at the upper end and the lower end of the insulating cylinder, the upper metal end cover and the lower metal end cover are respectively provided with a through hole, and the lower metal end cover is connected with a second grounding point 172 of the tower 19; the photoelectric separator 14 is arranged at the upper part of the tower 19, and the pressure resistance meets the requirement; the metal end cover can form an equipotential body, so that the metal end cover can conveniently realize ground protection. The function of the photoelectric separator 14 is to facilitate the separation of the metal single wire and the insulated optical unit.
The cable closure 18 is connected to a third grounding point 173 of the tower 19;
the metal single wires are separated from the insulated optical units at the upper ends of the photoelectric separators 14, the ends of the cut metal single wires are connected with the upper metal end covers, the first insulated optical units 1 and the second insulated optical units 2 penetrate through the photoelectric separators 14 and then are connected with the optical cable junction boxes 18, and the photoelectric separators 14 are respectively connected with the first insulated optical units 1 and the second insulated optical units 2 in a sealing mode to prevent rainwater from entering the insulating cylinders. The parts of the first insulating light unit 1 and the second insulating light unit 2 outside the photoelectric separator can be protected by a metal or non-metal sleeve, for example, a metal sleeve should be reliably grounded. The cable closure 18, whether metallic or non-metallic, should be secured to the tower 19 and grounded via a grounding point.
Further, a residual cable rack 16 for storing redundant insulated light units is further included, and the residual cable rack 16 is connected with a fourth grounding point 174 and a fifth grounding point 175 of the tower 19. The remaining cable support 16 should be fixed to the tower 19 and be reliably grounded via a grounding point.
Fig. 2 only gives the utility model discloses an application case of IOPGW unilateral on shaft tower 19 can be promoted to the strain insulator tower two sides, hang unilateral and two side applications through this case, all receives the utility model discloses a protection.
The utility model discloses energy-saving multi-functional insulating light unit optical fiber composite overhead ground wire 11 is made by one or more insulating light units and metal single line transposition, because the high insulating, high temperature resistant, high strength and thermal-insulated performance such as the insulating light unit are excellent, when bearing the same cross-sectional area with traditional OPGW, has promoted thermal capacity and short-circuit current performance; the IOPGW performs electricity/light separation on the upper part of the electric power tower 19, the lower end of the lead is uncharged, and the whole-process insulation single-point grounding is adopted, so that the line loss of the electric transmission line can be greatly reduced, the consumption and the energy can be reduced, and the ice can be melted; according to different monitoring objects, corresponding optical fibers and measurement technologies are adopted to realize multifunction, and various parameters such as strain, temperature, vibration, ice coating and the like can be monitored in real time.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. Insulating light unit optical fiber composite overhead ground wire, characterized in that, includes first insulating light unit, second insulating light unit and a plurality of metal single line, second insulating light unit and these metal single line are stranded around first insulating light unit thereby form the multilayer stranded layer, wherein:
the first insulating light unit comprises a first insulating sleeve and a sensing optical fiber arranged in the first insulating sleeve, and the material of the first insulating sleeve is selected from PTEE, ETFE or PEEK;
the second insulating optical unit comprises a second insulating sleeve and a communication optical fiber arranged in the second insulating sleeve, the second insulating sleeve is made of PTEE, ETFE or PEEK, and the second insulating sleeve is filled with fiber paste.
2. The insulated optical unit fiber composite overhead ground wire of claim 1, wherein the excess length of the communication fiber in the second insulating sleeve is 0.2% to 0.3%.
3. The insulated optical unit fiber composite overhead ground wire of claim 1, wherein the sensing fiber has a plurality of fibers for sensing strain, temperature, vibration and ice coating.
4. The insulated optical unit optical fiber composite overhead ground wire of claim 3, wherein the sensing optical fiber for detecting strain has an extra length of 0.1-0.2%, and the sensing optical fiber for detecting temperature, vibration and ice has an extra length of 0.2-0.3%.
5. The insulated optical unit fiber composite overhead ground wire of claim 3, wherein the stranded layer has three or more layers, and the second insulated optical unit is located in a second outer layer.
6. The insulated optical unit fiber composite overhead ground wire of claim 5, wherein the second insulated optical unit is provided with a plurality of.
7. The insulated optical unit fiber composite overhead ground wire of claim 1, wherein the metal single wire is a galvanized steel wire, an aluminum-clad steel wire, an electrical aluminum wire or an aluminum alloy wire.
8. The overhead transmission line comprises the insulated optical unit optical fiber composite overhead ground wire of any one of claims 1 to 7, and is characterized by further comprising a strain pre-stranded wire hardware fitting, a tower, a photoelectric separator, an insulator string and an optical cable junction box, wherein the insulator string is provided with a discharge gap, and the optical cable junction box comprises:
the insulating optical unit optical fiber composite overhead ground wire is clamped by the strain pre-twisted wire hardware fitting, the strain pre-twisted wire hardware fitting is connected with the insulator string, and the insulator string is connected with a first grounding point at the top of the tower;
the photoelectric separator comprises an insulating cylinder, an upper metal end cover and a lower metal end cover, wherein the upper metal end cover and the lower metal end cover are respectively arranged at the upper end and the lower end of the insulating cylinder, the upper metal end cover and the lower metal end cover are respectively provided with a through hole, and the lower metal end cover is connected with a second grounding point of the tower;
the optical cable splice box is connected with a third grounding point of the tower;
the end of the cut metal single wire is connected with the upper metal end cover, the first insulating optical unit and the second insulating optical unit penetrate through the photoelectric separator and then are connected with the optical cable junction box, and the photoelectric separator is respectively connected with the first insulating optical unit and the second insulating optical unit in a sealing mode so as to prevent rainwater from entering the insulating cylinder.
9. The overhead transmission line of claim 8, further comprising a surplus cable rack for stocking redundant insulated optical units, the surplus cable rack connecting a fourth grounding point and a fifth grounding point of the tower.
10. The overhead transmission line according to claim 8, wherein the first and second insulated light units are waterproofed by sleeving the parts outside the photoelectric separator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220526442.XU CN217113936U (en) | 2022-03-11 | 2022-03-11 | Insulating optical unit optical fiber composite overhead ground wire and overhead transmission line comprising same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220526442.XU CN217113936U (en) | 2022-03-11 | 2022-03-11 | Insulating optical unit optical fiber composite overhead ground wire and overhead transmission line comprising same |
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| CN217113936U true CN217113936U (en) | 2022-08-02 |
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| CN202220526442.XU Active CN217113936U (en) | 2022-03-11 | 2022-03-11 | Insulating optical unit optical fiber composite overhead ground wire and overhead transmission line comprising same |
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