Residual voltage discharge device for overhead line system

Abstract

The utility model relates to a residual voltage discharge device for a contact network, which is used for discharging residual voltage of a subway power supply system and ensures the personal safety of operators and the stable operation of the subway power supply system. In order to facilitate the discharge of the residual voltage of the subway power supply system by the residual voltage discharge device for the contact network, the residual voltage discharge device for the contact network is respectively connected with the contact network and the subway steel rail of the subway power supply system. The catenary residual voltage discharge device comprises a fuse and a discharge unit which are connected with each other, a catenary is connected with the fuse, and the discharge unit is connected with a subway steel rail. The residual voltage is discharged through the discharge unit, and the use safety of the residual voltage discharge device for the overhead line system is ensured through the fuse.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of discharge device, specifically related to a contact net residual voltage discharge device. BACKGROUND

[0002] In order to guarantee the normal work of subway vehicle, the subway steel rail and contact net are arranged in the subway tunnel, when the contact net is powered off, there is still residual charge, and there is audible and visual alarm condition through the electricity testing of electroscope, exceeds the starting voltage value of electroscope, leads to alarm, and the contact net is not allowed to be connected with ground wire, thereby affecting the normal maintenance operation, and certain risk is brought to the personal safety of operating personnel and the operation of equipment, and the abnormal voltage phenomenon also leads to that the line detection is not passed, influences the closing of circuit breaker, and leads to that the power supply partition cannot send power. SUMMARY

[0003] In view of the above, the technical problem to be solved by the utility model is to provide a contact net residual voltage discharge device, which consumes and releases the residual charge in the cable by the contact net residual voltage discharge device, so as to achieve the purpose of discharge and guarantee the personal safety of operating personnel and the stable operation of equipment.

[0004] To solve the above technical problem, the utility model adopts the technical scheme that,

[0005] A contact net residual voltage discharge device is used for discharging the voltage residual voltage of a subway power supply system, and the contact net residual voltage discharge device is connected with the contact net and the subway steel rail of the subway power supply system respectively, and the contact net residual voltage discharge device comprises a fuse and a discharge unit connected with each other, the contact net is connected with the fuse, and the discharge unit is connected with the subway steel rail.

[0006] As a preferred scheme of the utility model, the discharge unit comprises a discharge resistor and a detection unit, the discharge resistor is connected with the fuse and the subway steel rail respectively, and the detection unit is connected in parallel with the auxiliary contact of the fuse.

[0007] As a preferred scheme of the utility model, the detection unit comprises a detection power supply, a detection circuit, a fault lamp and a working lamp, the detection circuit is connected with the detection power supply, and the fuse, the fault lamp and the working lamp are connected on the detection circuit respectively.

[0008] As a preferred scheme of the utility model, the detection circuit comprises a normally closed branch and a normally open branch, the fuse is connected with the normally closed branch and the normally open branch respectively, the working lamp is connected on the normally closed branch, and the fault lamp is connected on the normally open branch.

[0009] As a preferred scheme of the utility model, a detection switch is connected on the normally closed branch and the normally open branch, and the detection switch is connected in parallel with the auxiliary contact of the fuse.

[0010] As a preferred scheme of the utility model, the detection circuit includes a power switch, and the power switch is connected with the normally closed branch and the normally open branch in series.

[0011] As a preferred scheme of the utility model, the front end of the fuse is connected with an insulator, and the catenary is connected with the fuse through the insulator.

[0012] As a preferred scheme of the utility model, the catenary residual voltage discharge device includes a box body, and the box body is provided with a wiring cavity, a discharge cavity, a fuse cavity and a detection cavity; the discharge unit is matched with the discharge cavity and the detection cavity, the wiring end of the discharge unit extends into the wiring cavity, and the fuse is installed in the fuse cavity.

[0013] As a preferred scheme of the utility model, the discharge cavity is provided with an insulator, and the two ends of the insulator extend into the wiring cavity and the fuse cavity respectively.

[0014] As a preferred scheme of the utility model, the bottom of the box body is provided with a mounting bracket, and the box body is fixed in the subway tunnel through the mounting bracket.

[0015] As a preferred scheme of the utility model, the subway tunnel is provided with a disconnecting switch, and the catenary residual voltage discharge device is connected with the disconnecting switch.

[0016] The utility model has the advantages that (1) the discharge device timely releases the residual voltage on the catenary, reduces the safety risk of the staff in the maintenance or detection process, and thus protects the life safety of the operating personnel.

[0017] (2) the discharge device reduces the failure and downtime caused by the residual voltage problem, makes the power system more stable and reliable, and improves the operation efficiency of the power system. DRAWINGS

[0018] Figure 1 It is the use schematic view of the catenary residual voltage discharge device.

[0019] Figure 2 It is the structural schematic view of the catenary residual voltage discharge device.

[0020] Figure 3 It is the circuit diagram of the detection unit.

[0021] Drawing reference: catenary 1, subway rail 2, fuse 3, discharge resistor 4, detection unit 5, detection power supply 5-1, fault lamp 5-2, working lamp 5-3, normally closed branch 5-4, normally open branch 5-5, detection switch 5-6, power switch 5-7, insulator 6, box body 7, wiring cavity 7-1, discharge cavity 7-2, fuse cavity 7-3, detection cavity 7-4, mounting bracket 8, disconnecting switch 9. DETAILED DESCRIPTION

[0022] The utility model is further described below in combination with the drawings.

[0023] A contact net residual voltage discharge device is used for discharging the residual voltage of a subway power supply system, and guarantees the personal safety of operating personnel and the stable operation of the subway power supply system. In order to facilitate the discharge of the residual voltage of the subway power supply system by the contact net residual voltage discharge device, the contact net residual voltage discharge device is connected with the contact net 1 and the subway steel rail 2 of the subway power supply system. The contact net residual voltage discharge device comprises a fuse 3 and a discharge unit connected with each other, the contact net 1 is connected with the fuse 3, and the discharge unit is connected with the subway steel rail 2. The discharge unit is used for discharging the residual voltage, and the fuse 3 is used for guaranteeing the safe use of the contact net residual voltage discharge device.

[0024] The discharge unit comprises a discharge resistor 4 and a detection unit 5, the discharge resistor 4 is connected with the fuse 3 and the subway steel rail 2 respectively, the discharge resistor 4 is used for discharging the residual voltage, the detection unit 5 is connected in parallel with the auxiliary contact of the fuse 3, the detection unit 5 is used for detecting the fuse 3, and the fuse 3 is guaranteed to be in a normal working state, thereby guaranteeing the stable use of the contact net residual voltage discharge device.

[0025] The detection unit 5 comprises a detection power supply 5-1, a detection circuit, a fault lamp 5-2 and a working lamp 5-3, the detection circuit is connected with the detection power supply 5-1, the detection power supply 5-1 provides power supply for the light emission of the fault lamp 5-2 and the working lamp 5-3, and the fuse 3, the fault lamp 5-2 and the working lamp 5-3 are connected on the detection circuit.

[0026] The detection circuit comprises a normally closed branch 5-4 and a normally open branch 5-5 connected in parallel, the fuse 3 is connected with the normally closed branch 5-4 and the normally open branch 5-5, wherein the normally closed contact of the fuse 3 is connected on the normally closed branch 5-4, the working lamp 5-3 is connected on the normally closed branch 5-4, the normally open contact of the fuse 3 is connected on the normally open branch 5-5, and the fault lamp 5-2 is connected on the normally open branch 5-5. A detection switch 5-6 is connected on the normally closed branch 5-4 and the normally open branch 5-5, and the detection switch 5-6 is connected in parallel with the auxiliary contact of the fuse 3. The detection switch 5-6 is a normally open switch, when the fuse 3 is in a normal state, only the normally closed branch 5-4 is in a normally closed state, the fault lamp 5-2 does not work, and the working lamp 5-3 works, when the fuse 3 is in a disconnected state, the normally closed branch 5-4 is in a disconnected state, the fault lamp 5-2 works, and the working lamp 5-3 does not work, when the operating personnel detects the fuse 3, the detection switch 5-6 is pressed, and the fault lamp 5-2 and the working lamp 5-3 work simultaneously. Preferably, the fault lamp 5-2 is a red lamp, and the working lamp 5-3 is a green lamp.

[0027] The fuse 3 in the embodiment comprises a pair of normally open auxiliary contacts and a pair of normally closed auxiliary contacts, the four auxiliary contacts are auxiliary contacts of a control loop of the fuse 3, the detection unit 5 is connected in parallel with the two normally open auxiliary contacts and the two normally closed auxiliary contacts of the fuse 3, that is, the two normally closed auxiliary contacts are connected with the normally closed branch 5-4, the two normally open auxiliary contacts are connected with the normally open branch 5-5, and the detection switch 5-6 is connected with the two normally open auxiliary contacts and the two normally closed auxiliary contacts of the fuse 3 simultaneously, for detecting whether the fuse 3 is in a normal working state.

[0028] The detection circuit comprises a power switch 5-7, the power switch 5-7 is arranged in series with the normally closed branch 5-4 and the normally open branch 5-5, and the power switch 5-7 is used for controlling the on-off of the detection circuit.

[0029] The catenary residual voltage discharge device comprises a box body 7, the box body 7 is internally provided with a wiring cavity 7-1, a discharge cavity 7-2, a fuse cavity 7-3 and a detection cavity 7-4, wherein the detection unit 5 is arranged in the detection cavity 7-4, the discharge resistor 4 is arranged in the discharge cavity 7-2, the wiring ends of the discharge resistor 4 extend into the wiring cavity 7-1, and the fuse 3 is installed in the fuse cavity 7-3. The discharge cavity 7-2 is provided with an insulator 6, both ends of the insulator 6 extend into the wiring cavity 7-1 and the fuse cavity 7-3 respectively, the catenary 1 is connected with the fuse 3 through the insulator 6, and high-voltage electricity is prevented from being transmitted to the box body 7.

[0030] The bottom of the box body 7 is provided with a mounting bracket 8, the mounting bracket 8 is fixed on the side wall of the subway tunnel, and the box body 7 is mounted on the mounting bracket 8 through bolts.

[0031] The subway tunnel is provided with a disconnecting switch 9, one side of the disconnecting switch 9 is connected with a transformer substation, and the other side is connected with the catenary 1, the catenary residual voltage discharge device can be connected on the side connected with the catenary 1 of the disconnecting switch 9 or directly connected with the catenary 1, and is used for discharging residual voltage of the catenary 1.

[0032] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model; therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0033] Although the corresponding terms of the figure marks are used more in this article, but the possibility of using other terms is not excluded; using these terms is only for more convenient description and explanation of the essence of the utility model; it is contrary to the spirit of the utility model to interpret them as any kind of additional limitation.

Claims

1. A contact wire residual voltage discharge device, used to discharge residual voltage in a subway power supply system, characterized in that, The contact wire residual voltage discharge device is connected to the contact wire (1) and the subway rail (2) of the subway power supply system respectively. The contact wire residual voltage discharge device includes a fuse (3) and a discharge unit connected to each other. The contact wire (1) is connected to the fuse (3), and the discharge unit is connected to the subway rail (2).

2. The contact wire residual voltage discharge device according to claim 1, characterized in that, The discharge unit includes a discharge resistor (4) and a detection unit (5). The discharge resistor (4) is connected to the fuse (3) and the subway rail (2) respectively. The detection unit (5) is connected in parallel with the auxiliary contact of the fuse (3).

3. The contact wire residual voltage discharge device according to claim 2, characterized in that, The detection unit (5) includes a detection power supply (5-1), a detection circuit, a fault light (5-2), and a working light (5-3). The detection circuit is connected to the detection power supply (5-1), and the fuse (3), fault light (5-2), and working light (5-3) are respectively connected to the detection circuit.

4. The contact wire residual voltage discharge device according to claim 3, characterized in that, The detection circuit includes a normally closed branch (5-4) and a normally open branch (5-5). The fuse (3) is connected to the normally closed branch (5-4) and the normally open branch (5-5) respectively. The working light (5-3) is connected to the normally closed branch (5-4), and the fault light (5-2) is connected to the normally open branch (5-5).

5. The contact wire residual voltage discharge device according to claim 4, characterized in that, A detection switch (5-6) is connected to the normally closed branch (5-4) and the normally open branch (5-5). The detection switch (5-6) is connected in parallel with the auxiliary contact of the fuse (3).

6. The contact wire residual voltage discharge device according to claim 1, characterized in that, The front end of the fuse (3) is connected to an insulator (6), and the contact wire (1) is connected to the fuse (3) through the insulator (6).

7. The contact wire residual voltage discharge device according to claim 1, characterized in that, The contact wire residual voltage discharge device includes a housing (7), which is provided with a wiring cavity (7-1), a discharge cavity (7-2), a fuse cavity (7-3) and a detection cavity (7-4). The discharge unit is adapted to the discharge cavity (7-2) and the detection cavity (7-4). The wiring terminal of the discharge unit extends into the wiring cavity (7-1), and the fuse (3) is installed in the fuse cavity (7-3).

8. The contact wire residual voltage discharge device according to claim 7, characterized in that, The discharge cavity (7-2) is provided with an insulator (6), and the two ends of the insulator (6) extend into the wiring cavity (7-1) and the fuse cavity (7-3) respectively.

9. A contact wire residual voltage discharge device according to claim 7, characterized in that, The bottom of the box (7) is provided with a mounting bracket (8), and the box (7) is fixed in the subway tunnel by the mounting bracket (8).

10. A contact wire residual voltage discharge device according to claim 1, characterized in that, The subway power supply system includes a disconnecting switch (9), and the contact wire residual voltage discharge device is connected to the disconnecting switch (9).

Images