CN215378437U - Direct current traction power supply protection system based on optical fiber core copper stranded wire - Google Patents

Abstract

The utility model provides a direct-current traction power supply protection system based on an optical fiber core copper stranded wire, which comprises the optical fiber core copper stranded wire and a traction substation, wherein the optical fiber core copper stranded wire is laid along a contact net, two ends of the optical fiber core copper stranded wire are respectively connected with the traction substation, an optical fiber core of the optical fiber core copper stranded wire is connected with a protection device of the traction substation, and an outer stranded wire of the optical fiber core copper stranded wire is connected with a grounding busbar of the traction substation. According to the utility model, by utilizing the design characteristics that the bilateral combined-hop partition, the overhead ground wire protection partition and the laying path are consistent, the communication cable and the overhead ground wire use the optical fiber core copper stranded wire, the communication cable is an internal optical fiber core, and the overhead ground wire is an external stranded wire, so that the laying efficiency is obviously improved, and the construction cost and the routing inspection maintenance cost are reduced.

Description

Direct current traction power supply protection system based on optical fiber core copper stranded wire

Technical Field

The utility model belongs to the field of rail transit, and particularly relates to a direct-current traction power supply protection system based on an optical fiber core copper stranded wire.

Background

Based on the advantages of energy conservation, environmental protection, convenient traveling and promotion of urban economic life development, urban rail transit develops rapidly in more and more cities, and independent overhead ground wires and independent bilateral united-hop communication cables are generally arranged between adjacent traction substations on the upper and lower rows of a track. In a conventional 40km line, the lengths of the overhead ground wire and the double-side gang-hop communication cable are about 100 km. The overhead ground wire has the functions of lightning protection and fault current carrying in the urban rail transit line. No current is carried in normal operation; under the condition of lightning stroke, the overhead ground wire forms a drainage path; under the condition of a fault, the overhead ground wire forms a fault current path, so that a direct current secondary protection system in the traction substation trips. The double-side united-hop communication cable plays a role in protecting the united-hop information transmission in the urban rail transit line, so that the secondary protection system can cut off direct current feeders at two ends of a fault power supply arm, and the double-side united-hop communication cable is a necessary component in the direct current secondary protection system.

In the existing domestic and foreign lines, the overhead ground wire and the bilateral combined-hop communication cable are laid independently although in the same path, so that the laying cost is high, the routing inspection difficulty of the bilateral combined-hop communication cable is high, and the hidden fault point is difficult to remove.

Disclosure of Invention

The utility model provides a direct current traction power supply protection system based on an optical fiber core copper stranded wire, aiming at the technical problems in the prior art, and by utilizing the design characteristics that a double-side combined jump partition and an overhead ground wire protection partition are consistent with a laying path, the communication cable and the overhead ground wire use the optical fiber core copper stranded wire, the communication cable is an internal optical fiber core, and the overhead ground wire is an external stranded wire, so that the laying efficiency is obviously improved, and the construction cost and the inspection maintenance cost are reduced.

The technical scheme adopted by the utility model is as follows: the utility model provides a direct current pulls power supply protection system based on optical fiber core copper strands, includes optical fiber core copper strands and pulls the substation, optical fiber core copper strands lays along the contact net, and its both ends insert respectively and pull the substation, the optical fiber core of optical fiber core copper strands connects in the protection device who pulls the substation, the outer stranded conductor of optical fiber core copper strands connects in the female row of ground connection that pulls the substation.

Furthermore, the optical fiber core copper stranded wire is arranged at the top end of a support of a contact net through a support.

Further, the optical fiber core copper stranded wire comprises an optical fiber core, a loose tube, a water blocking tape, a central sheath and an outer stranded wire, wherein the loose tube, the water blocking tape, the central sheath and the outer stranded wire are sequentially sleeved outside the optical fiber core.

Furthermore, the outer layer stranded wire is formed by stranding a plurality of single-wire copper wires, and the outer layer stranded wire is a double-layer or three-layer single-wire copper wire.

Further, the water blocking tape is longitudinally wrapped or wrapped outside the loose tube.

Compared with the prior art, the utility model has the beneficial effects that:

1. the novel power supply protection design method of the optical fiber core copper stranded wire is adopted, under the premise that the functions of a rail transit power supply system are met, the erection and installation of the outer optical fiber core copper stranded wire have high universality, the method is the same as the laying method of the existing overhead ground wire, the paying-off method and the erection and installation scheme of the existing paying-off vehicle are not changed, the laying time, the fixing device and the labor cost of two sets of cables are reduced to one set, the energy is greatly saved, the manufacturing cost is reduced, the times of construction procedures are reduced, the laying difficulty is reduced, and the construction efficiency is improved;

2. the optical fiber core copper stranded wire adopted by the utility model has the fault protection function with double-side coupling jump and the grounding function, can be simultaneously inspected, and is combined with vehicle-mounted inspection equipment, so that the inspection efficiency is greatly improved.

3. The optical fiber core copper stranded wire adopts the structure of the optical fiber core, the loose tube, the water blocking tape, the central sheath and the outer stranded wire, meets the function of a rail transit power supply system, the optical fiber core is used as a medium for direct current protection joint jump information transmission, and the outer stranded wire is used for protection and tension bearing of the optical fiber core and has the functions of lightning protection and fault current carrying.

4. The outer stranded wire serves as an armor layer of the optical fiber, so that the tensile strength and the shear strength of the secondary communication optical cable are improved, and the external force resistance and the mechanical reliability of the secondary communication optical cable are improved; the outer stranded wire serves as a shielding layer of the optical fiber, so that the anti-electromagnetic interference capability of the secondary communication optical cable is improved, and the secondary communication quality is ensured.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a fiber core copper strand according to an embodiment of the present invention.

In the figure, 1-optical fiber core copper stranded wire, 2-strut, 3-contact wire, 4-grounding cable, 5-grounding busbar, 6-gang jumping optical fiber, 7-protective device, 11-optical fiber core, 12-loose sleeve, 13-water blocking tape, 14-central sheath and 15-outer stranded wire.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The embodiment of the utility model provides a direct-current traction power supply protection system based on an optical fiber core copper strand, which comprises an optical fiber core copper strand 1 and a traction substation as shown in figures 1-2. The optical fiber core copper stranded wire 1 is laid along a contact net and is laid in the same mode as the existing overhead ground wire. The optical fiber core copper stranded wire 1 is installed at the top end of a strut 2 of the contact net system through an angle steel bracket. The electric energy of the contact network system is supplied by a direct current switch cabinet (comprising a protection device 7) of the traction substation. Two ends of the optical fiber core copper stranded wire 1 are respectively connected into two traction substations, an outer stranded wire 15 of the optical fiber core copper stranded wire 1 is led to a grounding busbar 5 of the traction substations through a grounding cable 4, and an optical fiber core 11 of the optical fiber core copper stranded wire 1 is connected with a protection device 7 in the traction substations through a jump-connection optical fiber 6.

The optical fiber core copper stranded wire 1 comprises an optical fiber core 11, a loose tube 12, a water blocking tape 13, a central sheath 14 and an outer stranded wire 15, wherein the loose tube 12, the water blocking tape 13, the central sheath 14 and the outer stranded wire 15 are sequentially sleeved outside the optical fiber core 11. The water-blocking tape 13 is longitudinally wrapped or wrapped outside the loose tube 12. The outer layer stranded wire 15 is formed by stranding a plurality of single-wire copper wires, and the outer layer stranded wire 15 is a double-layer 6+12 or a three-layer 6+12+18 single-wire copper wire. The optical fiber core 11 is composed of a plurality of communication optical fibers and used as a medium for transmitting direct current protection joint hopping information. The loose tube 12 is used for loosely placing the optical fiber core 11, and protects the communication optical fiber from internal stress and external pressure. The water blocking tape 13 is used for radial waterproofing of the optical fiber core 11. The central jacket 14 serves for electrical isolation and physical abrasion protection of the fiber optic core 11 from the outer strands 15. The outer layer stranded wire 15 is used for protecting and tension bearing of the optical fiber core 11 and has the functions of lightning protection and fault current carrying. The outer layer stranded wire 15 of the optical fiber core copper stranded wire 1 has high-quality metal shielding, high mechanical strength and strong lightning resistance, and provides communication electromagnetic shielding, optical fiber armor protection and communication lightning protection functions for the optical fiber core 11 of the optical fiber core copper stranded wire 1.

The grounding function of the system is realized by the outer layer stranded wire 15 of the optical fiber core copper stranded wire 1 laid on the whole line, and under the condition of lightning stroke, the outer layer stranded wire 15 forms a drainage passage. The fault protection function of the system consists of a fault current path and a fault protection combined trip, wherein the fault current path is conducted to a grounding busbar 5 of a traction substation by an outer stranded wire 15 of an optical fiber core copper stranded wire 1 laid between adjacent traction substations. And (3) fault protection joint tripping, namely, a joint tripping signal sent by the protection device 7 of the near-end traction substation is transmitted to the protection device 7 of the direct-current switch cabinet of the far-end traction substation through the optical fiber core 11 of the optical fiber core copper stranded wire 1, so that bilateral joint tripping is realized, power supply of a contact network system between adjacent traction substations is cut off, and a fault protection effect is achieved.

The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the utility model is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.

Claims (5)

1. The utility model provides a direct current pulls power supply protection system based on optical fiber core copper strand wires which characterized in that: the optical fiber core copper stranded wire is laid along a contact net, two ends of the optical fiber core copper stranded wire are respectively connected with the traction substation, an optical fiber core of the optical fiber core copper stranded wire is connected with a protection device of the traction substation, and an outer stranded wire of the optical fiber core copper stranded wire is connected with a grounding busbar of the traction substation.

2. The optical fiber core copper strand-based direct current traction power supply protection system of claim 1, wherein: the optical fiber core copper stranded wire is arranged at the top end of a support of the contact net through a support.

3. The optical fiber core copper strand-based direct current traction power supply protection system of claim 1, wherein: the optical fiber core copper stranded wire comprises an optical fiber core, a loose tube, a water blocking tape, a central sheath and an outer stranded wire, wherein the loose tube, the water blocking tape, the central sheath and the outer stranded wire are sequentially sleeved outside the optical fiber core.

4. The fiber core copper strand based direct current traction power supply protection system of claim 3, wherein: the outer layer stranded wire is formed by stranding a plurality of monofilament copper wires and is a double-layer or three-layer monofilament copper wire.

5. The fiber core copper strand based direct current traction power supply protection system of claim 3, wherein: the water blocking tape is longitudinally wrapped or wrapped outside the loose sleeve.

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