CN214849563U - Overvoltage protection box applied to contact net traction power supply system - Google Patents
Overvoltage protection box applied to contact net traction power supply system Download PDFInfo
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- CN214849563U CN214849563U CN202121333646.3U CN202121333646U CN214849563U CN 214849563 U CN214849563 U CN 214849563U CN 202121333646 U CN202121333646 U CN 202121333646U CN 214849563 U CN214849563 U CN 214849563U
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- overvoltage
- power supply
- supply system
- spark gap
- contact net
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Abstract
The utility model discloses a be applied to contact net and pull power supply system's overvoltage protection case, include: the overvoltage damping device comprises an overvoltage damping inductor, a spark gap type surge protection device, a grounding copper bar and a grounding busbar, wherein a first leading-out end of the overvoltage damping inductor is electrically connected with an electric isolating switch of a contact net traction power supply system through a secondary cable, a second leading-out end of the overvoltage damping inductor is electrically connected with a substation secondary system of the contact net traction power supply system through the secondary cable, the first leading-out end of the overvoltage damping inductor is also electrically connected with one electric end of the spark gap type surge protection device, the other end of the spark gap type surge protection device is electrically connected with the grounding busbar, and the grounding busbar is grounded through the grounding copper bar. The utility model discloses can solve the problem that the forceful electric power invasion was prevented to direct current control isolator secondary system.
Description
Technical Field
The utility model belongs to the technical field of pull the power supply, more specifically relates to an overvoltage protection case for contact net pulls power supply system.
Background
The existing contact net electric isolating switch mainly adopts remote control and is connected with a secondary system of a traction substation through a secondary cable. When the electric isolating switch of the contact network is in short circuit or suffers from lightning stroke faults, short circuit or lightning stroke overvoltage can invade a secondary system of the substation along a secondary cable, and secondary equipment in the substation is damaged. In recent years, the electrified railway in China has more faults of the type, and the normal running of the railway is seriously influenced. Therefore, the problem of preventing the strong current from invading in the secondary system of the direct current control isolating switch needs to be solved.
SUMMERY OF THE UTILITY MODEL
At least one defect or improvement demand to prior art, the utility model provides a be applied to contact net and pull power supply system's overvoltage protection case can prevent that overvoltage from leading to the fact the secondary system equipment damage along the secondary cable invasion to pull substation secondary system.
In order to achieve the above object, the utility model provides a be applied to contact net and pull power supply system's overvoltage protection case, include: the overvoltage damping device comprises an overvoltage damping inductor, a spark gap type surge protection device, a grounding copper bar and a grounding busbar, wherein a first leading-out end of the overvoltage damping inductor is electrically connected with an electric isolating switch of a contact net traction power supply system through a secondary cable, a second leading-out end of the overvoltage damping inductor is electrically connected with a substation secondary system of the contact net traction power supply system through the secondary cable, the first leading-out end of the overvoltage damping inductor is also electrically connected with one electric end of the spark gap type surge protection device, the other end of the spark gap type surge protection device is electrically connected with the grounding busbar, and the grounding busbar is grounded through the grounding copper bar.
Preferably, the overvoltage protection box further comprises an insulating back plate, and the grounding busbar is fixed on the insulating back plate.
Preferably, the overvoltage protection box includes a plurality of the overvoltage damping inductors and a plurality of the spark gap type surge protection devices.
Preferably, the reference voltage of the spark gap type surge protection device is not more than 5000V, and the power frequency breakdown voltage of the spark gap is more than 550V and less than 2000V.
Generally, compared with the prior art, the utility model, beneficial effect has: when external overvoltage or internal operation overvoltage occurs at the isolating switch, the secondary system equipment damage caused by the fact that the overvoltage invades into a secondary system of a traction substation along a secondary cable can be prevented.
Drawings
Fig. 1 is a schematic diagram of an overvoltage protection box according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the utility model discloses a be applied to contact net and pull power supply system's overvoltage protection case, include: overvoltage damping inductance (1), spark gap type surge protection device (2), female (6) of ground connection copper bar (5) and ground connection, overvoltage damping inductance's first end (3) of drawing is connected through secondary cable and contact net traction power supply system's electronic isolator electricity, overvoltage damping inductance's second is drawn end (4) and is connected through secondary cable and contact net traction power supply system's substation secondary system electricity, overvoltage damping inductance's first end of drawing still is connected with spark gap type surge protection device electricity's one end electricity, spark gap type surge protection device's the other end is arranged the electricity with ground connection and is connected, ground connection female row is through ground connection copper bar ground connection.
The working principle of the overvoltage protection box is as follows: when the isolating switch generates short circuit overvoltage or lightning overvoltage and a secondary system breaks down, short circuit current or lightning current invades the overvoltage protection box along a secondary cable on the side of the isolating switch. Under the action of the overvoltage damping inductor, the voltage at the terminal of the first leading-out end (3) of the overvoltage damping inductor rises, so that the spark gap type surge protection device (2) discharges. The short-circuit current flows to the comprehensive grounding box of the traction substation through the grounding copper tube and then flows back to the traction transformer, and the lightning current flows into the main grounding grid of the substation, so that overvoltage is prevented from being generated on secondary equipment of the substation, and the secondary equipment in the traction substation is protected.
Preferably, the over-voltage damping inductance value is not less than 20 muH, the withstand voltage grade of the inductance coil is not less than 2000V, and the wire through-current capacity of the coil is not less than the rated current of the isolating switch operating mechanism.
Preferably, the overvoltage protection box further comprises an insulating back plate (not shown in the figure), and the grounding busbar is fixed on the insulating back plate. Can be fixed on the insulating back plate of the voltage protection box through bolts.
Preferably, the overvoltage protection box includes a plurality of the overvoltage damping inductors and a plurality of the spark gap type surge protection devices.
Preferably, the reference voltage of the spark gap type surge protection device is not more than 5000V, and the power frequency breakdown voltage of the spark gap is more than 550V and less than 2000V.
The overvoltage protection box provided by the patent can be used for preventing strong electricity from invading along a cable in a secondary system of a traction substation, a zoning station, an AT station and an opening and closing station.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides an overvoltage protection case for contact net pulls power supply system which characterized in that includes: the overvoltage damping device comprises an overvoltage damping inductor, a spark gap type surge protection device, a grounding copper bar and a grounding busbar, wherein a first leading-out end of the overvoltage damping inductor is electrically connected with an electric isolating switch of a contact net traction power supply system through a secondary cable, a second leading-out end of the overvoltage damping inductor is electrically connected with a substation secondary system of the contact net traction power supply system through the secondary cable, the first leading-out end of the overvoltage damping inductor is also electrically connected with one electric end of the spark gap type surge protection device, the other end of the spark gap type surge protection device is electrically connected with the grounding busbar, and the grounding busbar is grounded through the grounding copper bar.
2. The overvoltage protection box applied to a traction power supply system of a contact network according to claim 1, further comprising an insulating back plate, wherein the grounding busbar is fixed on the insulating back plate.
3. The overvoltage protection box applied to a traction power supply system of an overhead line system according to claim 1, comprising a plurality of said overvoltage damping inductors and a plurality of said spark gap type surge protection devices.
4. The overvoltage protection box applied to a traction power supply system of a contact network as claimed in claim 1, wherein the reference voltage of the spark gap type surge protection device is not more than 5000V, and the power frequency breakdown voltage of the spark gap is more than 550V and less than 2000V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121333646.3U CN214849563U (en) | 2021-06-16 | 2021-06-16 | Overvoltage protection box applied to contact net traction power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121333646.3U CN214849563U (en) | 2021-06-16 | 2021-06-16 | Overvoltage protection box applied to contact net traction power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214849563U true CN214849563U (en) | 2021-11-23 |
Family
ID=78807304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121333646.3U Active CN214849563U (en) | 2021-06-16 | 2021-06-16 | Overvoltage protection box applied to contact net traction power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214849563U (en) |
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2021
- 2021-06-16 CN CN202121333646.3U patent/CN214849563U/en active Active
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