CN201235831Y

CN201235831Y - Four-wire lead security device of phase-sensitive track circuit

Info

Publication number: CN201235831Y
Application number: CNU2008201159231U
Authority: CN
Inventors: 徐宗奇; 郜志强; 李智宇; 赵自信; 罗海涛; 任国桥; 王明媚; 王贵春; 平海川; 刘锐冬; 周青; 尹路; 王文龙; 庄和荣
Original assignee: BEIJING QUANLU COMMUNICATION SIGNAL RESEARCH DESIGN INST
Current assignee: Beijing Quanlu Communication Signals Research and Design Institute Co., Ltd.
Priority date: 2008-06-04
Filing date: 2008-06-04
Publication date: 2009-05-13
Anticipated expiration: 2018-06-04

Abstract

The utility model discloses a phase-sensitive track circuit four-down-lead safety device. A choke transformer with a choked flow impedance compensator and a rail circuit transformer are respectively connected with rails through four lead wires, the rail circuit transformer is only taken as a rail circuit channel, the choke transformer is in parallel connected to a track-circuit signaling channel only taken as an electrization traction current channel to enable the track-circuit signal to be separated from an electrization traction return flow line, thereby the utility model solves the problem that the same side choke linking wires at a sending end and a receiving end simultaneously are broken to fail in checking from several directions due to two factors that a loop is formed by the ground when the choke is connected in a circuit in series and the outdoor connection and the indoor connection are kept through the internal magnetic coupling of the choke transformer; and the problem that the same side linking wires are broken and loses occupation indication when the insulated single side of the occupied section is damaged.

Description

A kind of phase detecting track circuit four lead-in wire safety devices

Technical field

The utility model relates to phase detecting track circuit, is meant a kind of phase detecting track circuit four lead-in wire safety devices especially.

Background technology

Track circuit adopts rail as electric loop, utilizes the inspection that takies of the short circuit of two one steel rails being finished behind the train occupation circuit, and is the key foundation safety apparatus that guarantees safety of railway traffic.The impedance transformer center-point that the electrified section utilization is installed in transmission, receiving end is connected the recurrence of finishing electrified traction current with the impedance transformer center-point of adjacent sections.

Current station track circuit impedance transformer seals in the circuit, finishes the transmission of track-circuit signalling, and finishes the recurrence of traction current by the impedance transformer center-point.Behind transmission and receiving end both-end impedance transformer homonymy fixture wire broken string, track-circuit signalling connects the earth by the chokes center-point and constitutes electric loop, the broken string side rail circuit that de-orbits fully, magnetic coupling by the inner primary and secondary of impedance transformer makes indoor equipment be connected with outdoor formation, can't finish during train occupation the short circuit of track circuit and cause to be checked through taking of train, as Fig. 1, there is safety problem.

Adjacent phase detecting track circuit section adopts opposite polarity signal, finishes the inspection of insulation joint breakage in conjunction with the receptor that has the polarity resolution capability.Under two failure accumulation situations of homonymy fixture wire broken string after the one-sided breakage of train occupation section insulation, the adjacent sections signal will be by short circuited wheel shaft and the damaged insulation joint formation and the signal of this section same polarity, cause the expression that takies of forfeiture train,, have safety problem as Fig. 2.

The utility model content

The technical problems to be solved in the utility model is: the impedance transformer primary side has center-point totally three terminals, center-point connects the earth by adjacent sections, when faults such as disconnected rail of rail or fixture wire broken string, can constitute electric loop by center-point and single rail, and keep and indoor being connected by impedance transformer inner magnet coupling, cause sending, the receiving end homonymy chokes fixture wire one-sided damaged back of the forfeiture train shunt cross-check sum occupied block insulation homonymy fixture wire that breaks simultaneously breaks to lose and take expression.

The technical scheme that the utility model solves is: the utility model is to provide a kind of phase detecting track circuit four lead-in wire safety devices, comprising:

Track circuit sending end, receiving end, the impedance transformer that has impedance compensator and track transformer, the impedance transformer that has the chokes impedance compensator is connected rail with track transformer respectively by four fixture wires, the track transformer opposite side connects indoor equipment, track transformer connects track circuit steel rail line and indoor equipment, only as the track circuit passage, the impedance transformer that use has impedance compensator is connected in parallel on the track-circuit signalling passage, only, make track-circuit signalling and electrified traction current channel separation as electrified traction current passage.Described chokes impedance compensator is that electric capacity and inductance are connected in series, the 25Hz track-circuit signalling is presented capacitive, constitute parallel resonance with choke induction, impedance transformer is formed the 25Hz signal is presented resistive, and this is parallel to the normal operation that impedance on the track circuit does not influence track circuit; Chokes impedance compensator series resonance forms impedance transformer the 50Hz power frequency component is presented short circuit at 50Hz.

Adopt above-mentioned device, impedance transformer, track transformer connect rail respectively, cut off the loop and the interface channel of indoor generation that chokes center-point and rail constitute, eliminated the potential safety hazard that taking of train under the fault condition can't the shunt track circuit, improved safety assurance.

Description of drawings

Fig. 1 track circuit both-end homonymy fixture wire broken string circuit diagram;

Lose under one-sided fixture wire broken string of Fig. 2 and the damage in insulation condition and take the check circuit scheme drawing;

Fig. 3 adjacent sections insulation joint two side apparatus connection diagrams;

Fig. 4 four lead-in wire safety devices constitute the track circuit connection diagram.

The specific embodiment

For clearly demonstrating the technical scheme in the utility model, provide preferred embodiment below and be described with reference to the accompanying drawings.

What the utility model solved is because by chokes center-point connection the earth formation loop with by two safety problems that factor caused of external equipment in the impedance transformer in-to-in magnetic coupling communication chamber that seals in track circuit, behind impedance transformer incircuit in parallel, the track-circuit signalling transmission will be without impedance transformer, cut off magnetic coupling passage by impedance transformer, track transformer is the unique passage of indoor and outdoor bonded assembly, because once survey and secondary side all have only 2 splicing ears, do not exist fixture wire broken string back to connect the situation of the earth by center-point, behind the track transformer fixture wire broken string, the shutoff signal transmission path, make rail-guided secure side, the passage that has separated track circuit and traction current, as shown in Figure 3, solid arrow is that traction current flows to, the direction of dotted arrow is the track-circuit signalling current direction, solved the earth and constituted the loop and occur simultaneously, thoroughly solved the forfeiture that this condition causes and take safety problems such as inspection by two factors of external equipment in the magnetic coupling communication chamber.

As shown in Figure 4, the track circuit connection diagram for constituting by four lead-in wire safety devices.Track circuit sends, receiving device directly connects rail by track transformer, send the receiving end impedance transformer and be connected on the rail, the impedance transformer broken string will cause the rising of receiving-end voltage, in order to ensure security of system under this fault condition, must consider in the design still can realize under the equal deletion condition of bilateral chokes checking along separate routes.The receiving end rail side impedance of track circuit is the key parameter that influence shunt and disconnected rail are checked performance, the amount of impedance rising and the watt loss of reduction impedance transformer are gone in the side-looking of caused receiving end rail because chokes break in order to reduce, impedance transformer need be designed to higher impedance, and guaranteeing still can be reliably along separate routes under the condition of chokes disappearance.The chokes secondary side has been installed the chokes impedance compensator that presents the capacitive electric characteristic at the 25Hz frequency, constitute parallel resonance with choke induction, form high resistance, need be in the design greater than 15 Ω, in order to reduce high voltage transfer that unbalanced current produces in the rail side to the indoor interference that causes reception facilities, the chokes impedance compensator is designed to series resonance in the 50Hz frequency, forms the short circuit to overbalance traction power frequency component.The no-load voltage ratio and the indoor reception facilities impedance of appropriate design of preferred receiving end track transformer keep rail receiving end track transformer to look shunt and the disconnected rail inspection that is enough to guarantee track circuit into resistance value, select to be not more than 3 Ω in the design.

Adopt above-mentioned device, impedance transformer, track transformer connect rail respectively, cut off the loop and the interface channel of indoor generation that chokes center-point and rail constitute, eliminated the potential safety hazard that taking of train under the fault condition can't the shunt track circuit, improved safety assurance.For the device of being set forth among the embodiment of the present utility model, 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 phase detecting track circuit four lead-in wire safety devices, comprise: track circuit sending end, receiving end, the impedance transformer that has impedance compensator and track transformer, it is characterized in that, the impedance transformer that has the chokes impedance compensator is connected rail with track transformer respectively by four fixture wires, and the track transformer opposite side connects indoor equipment.

2, device according to claim 1 is characterized in that, described track transformer also connects track circuit steel rail line and the indoor equipment as the track-circuit signalling passage; The described impedance transformer that has impedance compensator is directly parallel on the rail, as electrified traction current passage.

3, device according to claim 1 is characterized in that, described chokes impedance compensator is that electric capacity and inductance are connected in series, and the 25Hz track-circuit signalling is presented capacitive, constitutes parallel resonance with choke induction; Described chokes impedance compensator series resonance obtains the short circuit to power frequency component at 50Hz.