CN212979962U

CN212979962U - Grounding protection system of direct-current traction power supply double-insulation contact network system

Info

Publication number: CN212979962U
Application number: CN202021026484.4U
Authority: CN
Inventors: 王正; 尹超准; 陈敏; 程军; 陈怀鑫; 张昊然; 李逢源; 周云锋; 孙少南; 赵洋洋; 彭程
Original assignee: Tianjin Zhongtie Electrification Design Research Institute Co ltd
Current assignee: China Railway Electrification Survey Design and Research Institute Co Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-04-16
Anticipated expiration: 2030-06-05

Abstract

The utility model discloses a ground protection system of direct current traction power supply dual insulation contact net system, including burying ground and lining up insulated cable, burying ground and lining up bare conductor, protection cable and wire jumper and pillar ground connection cable, bury ground and lining up insulated cable, bury ground and lining up bare conductor and all bury underground, protection cable and wire jumper one end are connected between basic insulation, supplementary insulation, and the other end is connected bury ground and lining up insulated cable, pillar ground connection cable both ends connect the pillar respectively with bury ground and lining up bare conductor. The utility model provides a short-circuit current monitoring path when the basic insulation is damaged, thereby facilitating the operation to find the insulation damage fault and replace in time; when the contact network is disconnected, the short-circuit current monitoring path to the ground when the wire rod is lapped to the strut is convenient for operation to find the disconnection fault and to repair the disconnection fault in time; the electric shock injury to the public touching the supporting column due to the fact that basic insulation damage is not found and replaced in time and auxiliary insulation damage is avoided.

Description

Grounding protection system of direct-current traction power supply double-insulation contact network system

Technical Field

The utility model belongs to the technical field of urban rail transit, in particular to ground protection system of direct current traction power supply double insulation contact network system.

Background

Based on the urban development and the requirements of environmental protection and energy conservation, urban rail transit is developed rapidly, and tramcars sharing the right-of-way operation mode are also adopted and implemented in a plurality of cities due to the limitations of roads, surrounding environments and the like. Correspondingly, trams at home and abroad generally adopt a dual-insulation overhead contact system power supply system, other protective measures are generally not adopted at home and abroad except dual insulation, a design scheme of adopting dual insulation and overhead ground wires is provided at home, but according to theoretical analysis and calculation, when dual insulation is accidentally damaged, electric shock injury of the public touching electric conductors such as contact system columns at the moment can not be effectively avoided, therefore, a more effective grounding protection method needs to be effectively adopted, and the grounding safety of the dual-insulation overhead contact system under the shared right-of-way operation mode is improved.

The existing double insulation can not provide a short circuit current backflow path in time when the double insulation is damaged or a contact net is broken to lap the support, so that the public safety of the contact support can not be protected in time. According to the scheme of double insulation and the overhead ground wire, after a short-circuit fault occurs and before the relay protection action of a traction station is performed and the fault is removed, the safety of a human body when the human body touches a strut along the line cannot be guaranteed through the scheme of single insulation and single through ground wire backflow protection.

Disclosure of Invention

The utility model discloses to the technical problem who exists among the prior art, provide a ground protection system of direct current traction power supply double insulation contact network system, set up two protection earth connections, provide the short circuit monitoring route when monitoring and contact net broken string overlap joint pillar to basic insulation flashover or damage to ensure the security under the shared right of way tram operation line mode.

The utility model adopts the technical proposal that: the ground protection system comprises a buried through insulating cable, a buried through bare conductor, a protection cable, a jumper wire and a strut ground connection cable, wherein the buried through insulating cable and the buried through bare conductor are buried underground, one end of the protection cable and the jumper wire are connected between basic insulation and auxiliary insulation, the other end of the protection cable and the jumper wire are connected with the buried through insulating cable, and two ends of the strut ground connection cable are respectively connected with the strut and the buried through bare conductor. The buried through insulated cable and the buried through bare conductor are connected with a station ground net respectively at two ends.

Preferably, a Y-shaped insulating box is arranged outside the connection part of the protection cable and the jumper wire and the buried through insulating cable.

Preferably, the protection cable and the jumper are connected with the buried through insulation cable in a pressing mode through an H-shaped clamp.

Preferably, the pillar grounding connection cable and the buried penetrating bare conductor are connected through an H-shaped wire clamp.

Preferably, the H-shaped wire clamp is made of a conductive material.

Preferably, the buried through-insulation cable is a copper cable.

Preferably, the buried through bare conductor is a copper stranded wire.

Preferably, the auxiliary insulation is located between the pillar and the primary insulation.

The working principle is as follows: the double-protection grounding wire arranged in the double-insulation contact net system is laid through along a line, and two ends of the double-protection grounding wire are connected to a station grounding net. One protection wire is installed with the grounding bodies such as the supporting columns in an insulating mode and connected with the double-insulation middle part of each supporting column through a stranded wire and a protection monitoring cable T, and the other protection wire is connected with each supporting column through the cable T.

And comprehensively considering the landscape, the two protection wires are buried, laid and installed, one protection wire is insulated with grounding bodies such as the support and the like by adopting an insulated cable and is connected with the protection monitoring cable through a Y-shaped insulated box T, and the other protection wire is connected with the support through a cable and a wire clamp T by adopting a bare conductor.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

1. the utility model provides a short-circuit current monitoring path when the basic insulation is damaged, thereby facilitating the operation to find the insulation damage fault and timely replace the fault;

2. the utility model provides a dead-to-ground short-circuit current monitoring path when the contact net is broken and the wire rod is lapped on the pillar, thereby facilitating the operation to find the broken wire fault and the rush repair in time;

3. the utility model avoids the electric shock injury to the public touching the pillar because the basic insulation damage is not found and replaced in time;

4. the utility model discloses compromise when having promoted operation safety and reduce the invasion to the view along the line.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a detailed connection diagram of the buried through insulated cable, the protection cable and the jumper wire of the utility model;

fig. 3 is a detailed connection diagram of the buried through bare conductor and the pillar grounding connection cable of the utility model;

fig. 4 is a conceptual diagram of the present invention.

In the figure, 1-basic insulation, 2-auxiliary insulation, 3-buried through insulated cable, 4-buried through bare conductor, 5-station ground net, 6-protective cable and jumper, 7-support grounding connecting cable, 8-support, 9-Y type insulation box and 10-H type wire clamp.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The embodiment of the utility model discloses a ground protection system of a direct current traction power supply double insulation contact net system, as shown in the figure, it includes burying ground and lining up insulated cable 3, burying ground and lining up bare conductor 4, protection cable and jumper wire 6 and pillar ground connection connecting cable 7, burying ground and lining up insulated cable 3, burying ground and lining up bare conductor 4 and laying along the track, burying underground, its both ends connect a station ground net 5 respectively, burying ground and lining up insulated cable 3 adopts the copper cable, burying ground and lining up bare conductor 4 adopts the copper stranded wire, protection cable and jumper wire 6 one end is connected between basic insulation 1, auxiliary insulation 2, protection cable and jumper wire 6 lays along pillar 8, the other end connects buried and lining up insulated cable 3, the sheath is peeled off to the part of protection cable and jumper wire 6 junction and through H molded lines clamp 10 with burying ground and lining up insulated cable 3 crimping, the electric connection is kept, and a Y-shaped insulating box 9 is adopted to install and seal the connection part. The two ends of the strut grounding connecting cable 7 are respectively connected with the strut 8 and the buried through bare conductor 4, and the strut grounding connecting cable 7 and the buried through bare conductor 4 are connected through an H-shaped wire clamp 10. The H-shaped wire clamp 10 is made of a conductive material. The auxiliary insulation 2 is located between the pillar 8 and the primary insulation 1.

The present invention has been described in detail with reference to the embodiments, but the description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention. The protection scope of the present invention is defined by the claims. Technical scheme, or technical personnel in the field are in the utility model technical scheme's inspiration the utility model discloses an essence and protection within range, design similar technical scheme and reach above-mentioned technological effect, perhaps to the impartial change that application scope was made and improve etc. all should still belong to within the protection scope is covered to the patent of the utility model.

Claims

1. A ground protection system of a direct current traction power supply double insulation contact network system is characterized in that: including burying ground and lining up insulated cable, burying ground and lining up bare conductor, protection cable and wire jumper and pillar ground connection connecting cable, bury ground and lining up insulated cable, bury ground and lining up bare conductor and all burying underground, protection cable and wire jumper one end are connected between basic insulation, supplementary insulation, and the other end is connected bury ground and lining up insulated cable, pillar ground connection connecting cable both ends connect the pillar respectively with bury ground and lining up bare conductor.

2. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 1, wherein: and Y-shaped insulating boxes are arranged outside the joints of the protection cables and the jumper wires with the buried through insulating cables.

3. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 2, wherein: the protection cable and the jumper are connected with the buried through insulated cable in a pressing mode through the H-shaped wire clamp.

4. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 1, wherein: the pillar grounding connecting cable and the buried through bare conductor are connected through an H-shaped wire clamp.

5. The ground protection system of the direct current traction power supply double insulated contact net system according to claim 3 or 4, characterized in that: the H-shaped wire clamp is made of a conductive material.

6. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 1, wherein: the buried through insulated cable is a copper cable.

7. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 1, wherein: the buried through bare conductor is a copper stranded wire.

8. The ground protection system for a dc traction powered double insulated contact network system as recited in claim 1, wherein: the auxiliary insulation is located between the pillar and the primary insulation.