CN201143894Y

CN201143894Y - Air core reflux impedor

Info

Publication number: CN201143894Y
Application number: CNU200720174496XU
Authority: CN
Inventors: 李建清; 张苑; 刘键; 黄剑; 赵东亮; 罗松; 宋晓风; 王建国; 薛文丽
Original assignee: BEIJING QUANLU COMMUNICATION SIGNAL RESEARCH DESIGN INST
Current assignee: Beijing Quanlu Communication Signals Research and Design Institute Co., Ltd.
Priority date: 2007-10-18
Filing date: 2007-10-18
Publication date: 2008-11-05
Anticipated expiration: 2017-10-18

Abstract

The utility model discloses a hollow reflux impedor which includes an inductive choke and a resonant capacitor; the inductive choke and the resonant capacitor are connected parallely; the two ends connected parallely are provided with lead wires which are connected with steel rails; the inductive choke is provided with a connecting traction reflux line. The hollow traction reflux impedor of the utility model, on the one hand, can balance the traction current of two rail bars, reduce the DC impedance of the traction reflux steel rails and consumption of the traction current on steel rail lines; and on the other hand, reduce the DC voltage drop of the unbalanced traction current on both ends of the hollow traction reflux impedor, improve the rail circuit signal impedance of the hollow traction reflux impedor, and prevent impact on the work of the rail circuit when the hollow traction reflux impedor is added in the rail circuit. The inductive choke and the resonant capacitor are low in cost, can prevent high price of an iron core and realize wide scope of promotion.

Description

A kind of hollow backflow impedor

Technical field

The utility model relates to train power control technology field, is meant a kind of hollow backflow impedor especially.

Background technology

Along with the development of the vehicle, track traffic obtains more and more fast speed development, and in track vehicle, particularly electric locomotive is rapidly developed, as subway, light rail, electric power train etc.

In the present track traffic, locomotive generally adopts the direct-current traction power supply mode.Because the requirement of electric locomotive traction power supply, on steel rail line, certain distance just should be with the parallel connection of uplink and downlink rail at interval; Or with after the parallel connection of uplink and downlink steel rail line, with the traction current wire joint.

In existing track traffic, the traction current device adopts band return channel unshakable in one's determination more, has volume advantage small and exquisite, easy for installation.But because frequency generally higher (being not less than 4000Hz), iron loss is bigger, so volume is generally bigger.In order to reduce loss, need to select to adapt high-frequency iron core, so price is also higher.

The picture control coil that jointless track circuit adopted is an important component part of electrical insulation section, with the parallel connection of uplink and downlink track circuit, can stablize tuning district inductance value by picture control coil, to improve and to stablize its impedance; The 50Hz signal is presented low resistance, reduce of the pressure drop of overbalance traction current, and realize the balance traction electric current at rail level.

Therefore, though it is hollow coil, avoid using expensive iron core, it is special-purpose, owing to have its special applied environment, can not satisfy the DC traction section is provided with the traction current device in track circuit operating needs.

Therefore above-mentioned return channel is not suitable for being widely applied to and realizes traction current in the track traffic owing to need select the high-frequency iron core of high price for use; And the picture control coil cost is lower, but its limitation is not suitable for DC track circuit.Thereby for the traction current of locomotive, also there is not traction current device simple in structure and that easily promote the use of at present.

The utility model content

In view of this, the purpose of this utility model is the defective that overcomes prior art, and a kind of hollow backflow impedor is provided, to realize providing a kind of simple in structure and traction current device of easily promoting the use of.

The utility model provides a kind of hollow backflow impedor, comprising: inductance coil, resonant capacitance, and described inductance coil and described resonant capacitance are in parallel, and two ends in parallel have the lead-in wire that connects rail, have bonded assembly traction current line on the described inductance coil.

Preferably, described inductance coil and resonance impedance after described resonant capacitance is in parallel are greater than 10 ohm.

Preferably, the backflow capacity is less than 2000 amperes.

Preferably, frequency is greater than 1500 hertz.

Preferably, inductance value is greater than 55 microfarads.

Preferably, the dc impedance value of inductance coil L is less than 0.05 ohm.

Compared with prior art beneficial effect is in the utility model: the traction current between balanced on the one hand two rail bars, reduce the dc impedance of traction current rail, and reduce the loss of traction current on steel rail line; Reduce of the direct current pressure drop of overbalance traction current on the other hand, reduce interference the normal operation of track circuit equipment at hollow traction current impedor two ends; Meanwhile, improve the track-circuit signalling impedance of hollow traction current impedor, when avoiding in track circuit, setting up hollow traction current impedor, influence the work of track circuit.Because inductance coil L and resonance capacitor C is cheap, parallel-connection structure is simple, can avoid adopting high price unshakable in one's determination, can realize applying widely the DC traction section in track circuit again.

Description of drawings

Fig. 1 is the scheme drawing of the hollow impedance return channel of preferred embodiment;

Fig. 2 is the connection diagram of two hollow impedance return channels on the uplink and downlink rail;

Fig. 3 is the connection diagram of two hollow impedance return channels and traction current line terminals/ground wire terminal on the uplink and downlink rail.

The specific embodiment

For clearly demonstrating the hollow impedance return channel in the utility model, provide preferred embodiment of the present utility model below and be described with reference to the accompanying drawings.

Referring to Fig. 1, Fig. 1 is the constructional drawing of preferred embodiment.Hollow impedance return channel among this embodiment comprises: inductance coil L, resonant capacitance C, resonant capacitance C and inductance coil L are in parallel, and form the parallel resonance tank circuit.

Inductance coil L draws lead terminal 1 and lead terminal 2 with after resonant capacitance C is in parallel.Lead terminal 1 is respectively applied for rail with lead terminal 2 and is connected.Middle ground lead terminal 3 can be connected with the ground lead terminal of another hollow impedance return channel or with the ground wire joint.

Fig. 2 is that hollow impedance return channel is applied to the connection diagram on the rail.On the two-way rail of uplink and downlink, a hollow impedance return channel is arranged on the rail of every road, the hollow impedance return channel of every road rail is between two S electrical insulation sections, and the hollow impedance return channel of uplink and downlink rail is realized being connected in series.

Fig. 3 is the connection diagram of two hollow impedance return channels and traction current line terminals/ground wire terminal on the uplink and downlink rail.The hollow impedance return channel of uplink and downlink rail is connected on the traction current line terminals or ground wire terminal of substation after realizing being connected in series.

When being connected to hollow traction current device on the rail, inductance coil L in the hollow traction current impedor presents very low impedance to the traction direct current, its resistance value is not more than 0.05 Ω, DC traction electric current between balanced on the one hand two rail bars reduces the direct current pressure drop of overbalance traction current at hollow traction current impedor two ends on the other hand.

Resonant capacitance C in the hollow traction current impedor and inductance coil L constitute the parallel resonance tank circuit, resonance is in s-f, make its resonance impedance be not less than 10 Ω, when hollow traction current impedor is arranged in the track circuit, can reduce influence degree track circuit.

Above-mentioned hollow traction current device may be used in the AC and DC track circuit, and for reaching best realization effect, the total volume of backflow should be not more than 2000A, can adopt the lead of two 150mm^2, and every directly is made of for being not more than 0.57mm solid wire.Two leads are insulated from each other, parallel and around; During coiling, half-turn is four circles, amounts to eight circles; The frequency of hollow traction current device should be not less than 1500HZ, and inductance value should be not less than 55～70 μ f, and resistance value should be not more than 200 milliohms.

Hollow traction current impedor in the utility model, the traction current between balanced on the one hand two rail bars, the dc impedance of reduction traction current rail reduces the loss of traction current on steel rail line; Reduce of the direct current pressure drop of overbalance traction current on the other hand, reduce interference the normal operation of track circuit equipment at hollow traction current impedor two ends; Meanwhile, improve the track-circuit signalling impedance of hollow traction current impedor, when avoiding in track circuit, setting up hollow traction current impedor, influence the work of track circuit.

Because inductance coil L and resonance capacitor C is cheap, parallel-connection structure is simple, can avoid adopting high price unshakable in one's determination, can realize again promoting widely.

Describe preferred embodiment of the present utility model above in detail; for the traction current device of being set forth among the embodiment; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1, a kind of hollow backflow impedor is characterized in that, comprising: inductance coil, resonant capacitance, and described inductance coil and described resonant capacitance are in parallel, and two ends in parallel have the lead-in wire that connects rail, have bonded assembly traction current line on the described inductance coil.

2, hollow backflow impedor according to claim 1 is characterized in that, described inductance coil and resonance impedance after described resonant capacitance is in parallel are greater than 10 ohm.

3, hollow backflow impedor according to claim 1 is characterized in that the backflow capacity is less than 2000 amperes.

4, hollow backflow impedor according to claim 1 is characterized in that frequency is greater than 1500 hertz.

5, hollow backflow impedor according to claim 1 is characterized in that inductance value is greater than 55 microfarads.

6, hollow backflow impedor according to claim 1 is characterized in that, the dc impedance value of inductance coil L is less than 0.05 ohm.