CN219873231U - Grounding device suitable for special reflux of urban rail transit - Google Patents
Grounding device suitable for special reflux of urban rail transit Download PDFInfo
- Publication number
- CN219873231U CN219873231U CN202321127148.2U CN202321127148U CN219873231U CN 219873231 U CN219873231 U CN 219873231U CN 202321127148 U CN202321127148 U CN 202321127148U CN 219873231 U CN219873231 U CN 219873231U
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- Prior art keywords
- direct current
- current contactor
- isolating switch
- electric isolating
- grounding
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- 238000010992 reflux Methods 0.000 title claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of rail transit traction power supply, in particular to a special reflux grounding device suitable for urban rail transit, which comprises a compound switch composed of a direct current contactor and an electric isolating switch, wherein the direct current contactor is connected with a negative electrode reflux rail and a grounding busbar to realize quick grounding, the electric isolating switch is connected in parallel at two ends of the direct current contactor and is positioned in a loop formed by the direct current contactor, the negative electrode reflux rail and the grounding busbar, and the switching-on and switching-off state of the electric isolating switch and the switching-on and switching-off state of the direct current contactor are mutually follow-up. The utility model has the advantages that: the personal safety of operation and maintenance personnel during overhaul work is ensured, and the safety is high; simple and reasonable structure, good economy, convenient practical application and suitability for popularization.
Description
Technical Field
The utility model relates to the technical field of rail transit traction power supply, in particular to a grounding device suitable for special backflow of urban rail transit, and particularly relates to a grounding device for a direct current traction power supply system of urban rail transit.
Background
The positive pole and the negative pole of the direct current system for traction power supply of urban rail transit are installed in an insulating mode, and because of operation and short-circuit current, impermissible contact voltage is generated between a negative reflux loop and structural ground, and according to IEC62128-1/EN 50122-1 standard, the voltage of the negative pole to the ground needs to be limited to prevent personal safety from being damaged. At present, how to design a device to conveniently realize the grounding of the negative reflux loop so as to ensure personal safety is a technical problem to be solved urgently.
Disclosure of Invention
According to the defects of the prior art, the utility model provides the grounding device suitable for the special backflow of the urban rail transit, which can realize quick grounding when the special backflow of the negative electrode needs grounding, simultaneously provide a path for possible fault current, realize reliable grounding of the negative electrode to the ground, clamp the contact voltage with the ground absolute zero potential and ensure personal safety of operation and maintenance personnel during overhaul work.
The utility model is realized by the following technical scheme:
the utility model provides a grounding device suitable for special backward flow of urban rail transit which characterized in that: the device comprises a compound switch composed of a direct current contactor and an electric isolating switch, wherein the direct current contactor is connected with a negative electrode backflow rail and a grounding busbar to realize quick grounding, the electric isolating switch is connected in parallel with two ends of the direct current contactor and is positioned in a loop formed by the electric isolating switch, the negative electrode backflow rail and the grounding busbar, and the switching-on and switching-off state of the electric isolating switch and the switching-on and switching-off state of the direct current contactor are mutually follow-up.
The following of the on-off state of the electric isolating switch and the on-off state of the direct current contactor means that: when the direct current contactor is closed and the loop of the negative electrode reflux rail is short-circuited, the electric isolating switch is closed in a follow-up way; when the electric isolating switch is not grounded, the electric isolating switch is separated, and the direct current contactor is separated in a follow-up way.
The switching state of the direct current contactor and the electric isolating switch is controlled by a PLC controller.
The utility model has the advantages that: the personal safety of operation and maintenance personnel during overhaul work is ensured, and the safety is high; simple and reasonable structure, good economy, convenient practical application and suitability for popularization.
Drawings
FIG. 1 is a schematic diagram of the primary and secondary loop power connections of the present utility model;
FIG. 2 is a schematic diagram of a control loop of the present utility model;
FIG. 3 is a schematic diagram of a signal circuit of the present utility model;
fig. 4 is a schematic diagram of the PLC control of the present utility model.
Description of the embodiments
The features of the utility model and other related features are described in further detail below by way of example in conjunction with the following figures to facilitate understanding by those skilled in the art:
as shown in fig. 1-4, the labels 1-4 are shown as: the negative pole backward flow rail 1, ground busbar 2, direct current contactor 3, electronic isolator 4.
Examples: as shown in fig. 1 to 4, the grounding device suitable for the special backflow of the urban rail transit in the present embodiment is used for realizing the reliable grounding when the negative electrode backflow rail 1 needs to be grounded, and simultaneously providing a path for possible fault current.
As shown in fig. 1, the grounding device in the present embodiment includes a composite switch composed of a dc contactor 3 and an electric disconnecting switch 4. The direct current contactor 3 is connected between the negative electrode reflux rail 1 and the grounding busbar 2. When operation and maintenance personnel need to carry out maintenance operation in the power failure interval, the direct current contactor 3 is closed to short the negative electrode of the direct current power supply system with the grounding system, and the grounding device in the embodiment is used for realizing quick grounding. The electric isolating switch 4 is connected in parallel with the two ends of the direct current contactor 3 and is positioned in a loop formed by the electric isolating switch 3, the negative electrode reflux rail 1 and the grounding busbar 2, and the on-off state of the electric isolating switch 3 and the on-off state of the direct current contactor 3 are mutually follow-up.
Specifically, when the grounding device is grounded, the direct-current contactor 3 is firstly closed to reliably ground the circuit short circuit of the negative electrode reflux rail 1, so as to reduce the excessively high voltage which can be generated; at this time, the electric isolating switch 4 is closed in a follow-up way, so that on one hand, enough short-circuit capacity is ensured, and on the other hand, the control power supply is ensured to lose electricity, so that the direct current contactor 3 is separated to cause invalid grounding, and personal safety is threatened.
When the electric isolating switch is not grounded, the grounding device firstly separates the electric isolating switch 4, the direct current contactor 3 follows to ensure the no-load operation of the electric isolating switch 4, the direct current contactor 3 is opened after the electric isolating switch 4 is disconnected in place, the disconnection operation is completed, and the system is restored to the insulation state of the negative electrode return rail 1.
The embodiment is implemented in specific manner: the direct current contactor 3 and the electric isolating switch 4 can be controlled by a PLC controller.
The on/off state of the electric isolating switch 4, the on/off state of the direct current contactor 3, the working state of the PLC controller, the power supply state and other signal loops are shown in fig. 3, so that the working state of main components is monitored.
The control loop of the PLC controller can be designed in a mode shown in fig. 4, so that a remote control function and data background uploading are realized, the use effect of the grounding device is further improved, and the use safety of the grounding device is especially ensured.
Although the foregoing embodiments have been described in some detail with reference to the accompanying drawings, it will be appreciated by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the utility model as defined in the appended claims, and thus are not repeated herein.
Claims (3)
1. The utility model provides a grounding device suitable for special backward flow of urban rail transit which characterized in that: the device comprises a compound switch composed of a direct current contactor and an electric isolating switch, wherein the direct current contactor is connected with a negative electrode backflow rail and a grounding busbar to realize quick grounding, the electric isolating switch is connected in parallel with two ends of the direct current contactor and is positioned in a loop formed by the electric isolating switch, the negative electrode backflow rail and the grounding busbar, and the switching-on and switching-off state of the electric isolating switch and the switching-on and switching-off state of the direct current contactor are mutually follow-up.
2. The grounding device suitable for urban rail transit special backflow according to claim 1, characterized in that: the following of the on-off state of the electric isolating switch and the on-off state of the direct current contactor means that: when the direct current contactor is closed and the loop of the negative electrode reflux rail is short-circuited, the electric isolating switch is closed in a follow-up way; when the electric isolating switch is not grounded, the electric isolating switch is separated, and the direct current contactor is separated in a follow-up way.
3. The grounding device suitable for urban rail transit special backflow according to claim 1, characterized in that: the switching state of the direct current contactor and the electric isolating switch is controlled by a PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321127148.2U CN219873231U (en) | 2023-05-11 | 2023-05-11 | Grounding device suitable for special reflux of urban rail transit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321127148.2U CN219873231U (en) | 2023-05-11 | 2023-05-11 | Grounding device suitable for special reflux of urban rail transit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219873231U true CN219873231U (en) | 2023-10-20 |
Family
ID=88346689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321127148.2U Active CN219873231U (en) | 2023-05-11 | 2023-05-11 | Grounding device suitable for special reflux of urban rail transit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219873231U (en) |
-
2023
- 2023-05-11 CN CN202321127148.2U patent/CN219873231U/en active Active
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