CN110667390A

CN110667390A - Current collecting-grounding device based on rail transit rigid contact net

Info

Publication number: CN110667390A
Application number: CN201911098166.0A
Authority: CN
Inventors: 肖嵩; 孟举; 赖新安; 叶智宗; 童梦园; 李玉航; 吴京驰; 高波; 吴广宁
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-01-10

Abstract

The invention discloses a current collection-grounding device based on a rail transit rigid contact net, which comprises a first pantograph and a second pantograph, wherein the first pantograph and the second pantograph are arranged on a pantograph base; the first pantograph is in contact connection with the contact line through a pantograph head of the traction pantograph; the second pantograph is in contact connection with a return line through a pantograph head of the return pantograph; the return line is connected to the negative pole of the traction substation; the special return line is connected with the negative electrode of the traction substation, and traction current flows back through the special return line through one bow head of the double-bow-head pantograph structure and does not flow back through the traveling rail any more, so that the problem of stray current is solved.

Description

Current collecting-grounding device based on rail transit rigid contact net

Technical Field

The invention relates to the technical field of rail transit, in particular to a current collection-grounding device based on a rail transit rigid contact net.

Background

With the development of the society and the economy of China, the national economy of China is continuously, stably and forwards developed, and the rail transit is rapidly developed. At present, rail transit mainly adopts electric energy to carry out traction driving on a train. As the core for driving the electric locomotive, the traction power supply system mainly comprises a power grid input line, a traction substation, a feeder line, a traction contact network, a traveling rail, a return line and the like. The electric energy is output from the traction substation, and the contact is generated between the contact net and the train bow net system to transmit the electric energy to the traction equipment carried by the train to drive the train to run. In the running process of the train, the electric contact state of the contact net and the carbon pantograph slider is directly related to the current collection quality of the train. At present, overhead contact networks are mainly divided into two types, namely flexible contact networks and rigid contact networks, and the rigid contact network suspension mode adopts a rigid busbar clamping contact line. Compared with a flexible contact net, the rigid contact net has the advantages of simple structure, easy maintenance, firmness, durability, space saving and the like.

In addition to the current receiving system, the grounding system of the train is also an important link in the traction power supply system. At present, most of rail transit power supply systems return through a traveling rail, traction current returns through the traveling rail, and the traction current returns to a traction substation through the traveling rail. Since the trace is not completely insulated from ground, some current will leak from the trace to ground, creating stray currents. Stray currents are extremely harmful and can not only cause electrochemical corrosion to the running rail and accessories thereof, but also generate rail ground potential, and can threaten the safety of passengers and workers. Most of urban rail transit adopts direct current power supply, so the dispersion of direct current stray current in the ground is easier to interfere with the surrounding alternating current transmission lines, which causes the direct current magnetic bias of the transformer core in the transformer substation, seriously affects the power quality and aggravates the transmission loss. At present, some schemes exist for preventing and controlling stray current, such as reasonable arrangement of a traction substation, special arrangement of a stray current compensation device and the like. However, these methods only improve the current situation of the stray current, cannot solve the problem at all, and are expensive.

Disclosure of Invention

The invention aims at the problems in the prior art and adds a return line which is parallel to a contact line and is connected with the negative pole of a traction substation, thereby thoroughly solving the problem of stray current.

The technical scheme adopted by the invention is as follows: a current collection-grounding device based on a rail transit rigid contact net comprises a first pantograph and a second pantograph, wherein the first pantograph and the second pantograph are arranged on a base of the pantograph; the first pantograph is in contact connection with the contact line through a pantograph head of the traction pantograph; the second pantograph is in contact connection with a return line through a pantograph head of the return pantograph; the return line is connected to the negative pole of the traction substation.

Further, the contact line and the return line are respectively arranged on the bus bar; the bus bar is fixed on the suspension channel steel through a positioning wire clamp; and a contact net insulator is arranged between the busbar and the suspension channel steel.

Further, the pantograph base 7 is divided into two parts which are insulated from each other through a first isolation insulator, a second isolation insulator and a third isolation insulator, and is used for setting a first pantograph and a second pantograph respectively.

Furthermore, the pantograph base is arranged on the vehicle body, and a fourth isolation insulator is arranged between the pantograph base and the vehicle body.

Further, first pantograph and second pantograph structure are the same, and first pantograph includes pantograph upper ledge frame, pantograph lower boom and pantograph pull rod.

The invention has the beneficial effects that:

(1) the special return line is connected with the negative electrode of the traction substation by adding the return line parallel to the contact line, the traction current flows back through the special return line through one bow head of the double-bow-head pantograph structure and does not flow back through the traveling rail any more, and the problem of stray current is solved;

(2) the pantograph structure can effectively save space, and the pantograph head for current collection and the pantograph head for backflow belong to two groups of mechanical structures without mechanical connection, so that an insulating support is provided for a backflow scheme.

(3) The invention can effectively ensure that the train can reliably obtain the electric energy and the safe work of the electrical equipment from the contact network, prolong the service time of hardware facilities and ensure the safe operation of the train.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the entire structure of the pantograph according to the present invention.

Fig. 3 is a top view of the pantograph according to the present invention.

Fig. 4 is a schematic view of the structure of the rigid contact net of the present invention.

In the figure: 1-suspension channel steel, 2-contact network insulator, 3-positioning wire clamp, 4-busbar, 5-contact wire, 6-return wire, 7-pantograph base, 8-fourth isolation insulator, 9-traction pantograph head, 10-return pantograph head, 11-first pantograph, 12-second pantograph, 13-first isolation insulator, 14-second isolation insulator, and 15-third isolation insulator.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in fig. 1 to 4, a current collecting-grounding device based on a rigid contact network for rail transit comprises a first pantograph 11 and a second pantograph 12 arranged on a base 7 of the pantograph; the first pantograph 11 is in contact connection with the contact line 5 through a traction pantograph head 9; the second pantograph 12 is in contact connection with the return line 6 through a return pantograph head 10; the return line 6 is connected to the negative pole of the traction substation.

The contact line 5 and the return line 6 are respectively arranged on the bus bar 4; the bus bar 4 is fixed on the suspension channel steel 1 through a positioning wire clamp 3; and a contact net insulator 2 is arranged between the busbar 4 and the suspension channel steel 1. The pantograph base 7 is divided into two parts insulated from each other by a first isolation insulator 13, a second isolation insulator 14, and a third isolation insulator 15, and is used for installing a first pantograph 11 and a second pantograph 12, respectively. The pantograph base 7 is arranged on the vehicle body, and a fourth isolation insulator 8 is arranged between the pantograph base and the vehicle body. The first pantograph 11 and the second pantograph 12 are identical in structure, and the first pantograph 11 includes a pantograph upper frame, a pantograph lower arm lever, and a pantograph pull rod.

The mechanical structures of the first pantograph 11 and the second pantograph 12 are the same, and the pantograph comprises an upper pantograph frame, a lower pantograph arm and a pantograph pull rod. In order to ensure mutual insulation between the two groups of pantographs, a first isolation insulator 13, a second isolation insulator 14 and a third isolation insulator 15 are arranged on the pantograph base 7. The two groups of pantograph bow heads have different functions, one group is used for contacting with the contact line 5 to receive current and transmitting electric energy for train operation, and the other group is contacted with the return line 6 to be used for grounding return and providing a return channel for traction current. The distance between the traction pantograph head 9, the reflux pantograph head 10, the contact line 5, the reflux pantograph head 10, the reflux line 6 and the traction pantograph head 9 can be adjusted according to the actual use voltage value, the insulation distance of the traction pantograph head can be ensured, and the short circuit caused by offline electric arc can be prevented.

The current collection part keeps consistent with the current collection mode in the traditional rail transit, the traction substation transmits current to a contact net through a connected feeder line, and driving electric energy is obtained through the contact current collection of a traction pantograph head 9 and a contact line 5 in a pantograph structure. In the traditional rail transit operation mode, traction current flows back through the ground of the walking rail, and because the walking rail cannot be completely insulated from the ground, partial current leaks to the ground from the walking rail to form stray current. Stray currents pose a serious threat to both hardware infrastructure and to the reliable operation of electrical equipment.

The invention modifies the traditional rail transit power supply system in a running rail backflow mode, adds a backflow line 6 parallel to the traditional suspension type rigid contact network for grounding backflow to replace the running rail backflow. The backflow of the running rail is avoided, and the generation of stray current can be fundamentally avoided, so that the service life of the running rail can be prolonged, and the normal work of the electrical equipment can be ensured.

Claims

1. A current collection-grounding device based on a rigid contact net for rail transit is characterized by comprising a first pantograph (11) and a second pantograph (12) which are arranged on a pantograph base (7); the first pantograph (11) is in contact connection with the contact line (5) through a traction pantograph head (9); the second pantograph (12) is in contact connection with the return line (6) through a return pantograph head (10); the return line (6) is connected to the negative pole of the traction substation.

2. The current collecting-grounding device based on the rigid contact net of the rail transit is characterized in that the contact line (5) and the return line (6) are respectively arranged on a bus bar (4); the bus bar (4) is fixed on the suspension channel steel (1) through a positioning wire clamp (3); and a contact net insulator (2) is arranged between the busbar (4) and the suspension channel steel (1).

3. The current collection-grounding device based on the rail transit rigid contact network is characterized in that the pantograph base (7) is divided into two parts which are insulated from each other through a first isolation insulator (13), a second isolation insulator (14) and a third isolation insulator (15) and used for arranging a first pantograph (11) and a second pantograph (12) respectively.

4. The current collecting-grounding device based on the rail transit rigid contact net is characterized in that the pantograph base (7) is arranged on the vehicle body, and a fourth isolation insulator (8) is arranged between the pantograph base and the vehicle body.

5. The current-grounding device based on the rigid contact line of the rail transit is characterized in that the first pantograph (11) and the second pantograph (12) are identical in structure, and the first pantograph (11) comprises a pantograph upper frame, a pantograph lower arm rod and a pantograph pull rod.