CN202541351U - Stray current control system for DC (direct current) traction power supply - Google Patents
Stray current control system for DC (direct current) traction power supply Download PDFInfo
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- CN202541351U CN202541351U CN2011205214244U CN201120521424U CN202541351U CN 202541351 U CN202541351 U CN 202541351U CN 2011205214244 U CN2011205214244 U CN 2011205214244U CN 201120521424 U CN201120521424 U CN 201120521424U CN 202541351 U CN202541351 U CN 202541351U
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Abstract
The utility model relates to a functional part of a DC (direct current) traction power supply system for urban rail transit, and particularly relates to a stray current control system for DC traction power supply. The stray current control system consists of a high-voltage main loop and a low-voltage control system, wherein the high-voltage main loop comprises a chopping and resistance control unit connected between a current drainage net and a negative bus of the DC traction power supply system, a diode D, a fast acting fuse F, a charging switch Q and a fixed current limiting resistor R; the low-voltage control system comprises a current measurement module and a voltage measurement module for detecting current and voltage of the main loop, and also comprises a detection control system capable of receiving and processing the analog quantity of a current/voltage detection signal; and the control signal output end of the detection control system controls the resistance of the chopping and resistance control unit through a photo-electrical isolation module and a drive control circuit. With the adoption of the stray current control system provided by the utility model, the problem of stray current corrosion of the urban rail transit is solved, equipment under protection is better protected, and relatively small interference is generated to surrounding systems.
Description
Technical field
The utility model relates to the functional component of urban track traffic DC traction power-supply system, specifically is a kind of direct-current traction power supply stray current control system.
Background technology
In the urban track traffic DC traction power-supply system, the etching problem for the stray current that solves railway roadbed and structure reinforcing bars adopts the stray current protective device usually.But since the protection of stray current with direct-current traction power supply, civil engineering, track, feedwater row, communicate by letter, a plurality of professional relationships such as signal are close; Existing control system has many deficiencies on mode; The control accuracy of its measurement is not high; Exist and can not eliminate stray current influence fully, protect not thoroughly, perhaps drainage current is excessive and system caused defective such as interference.
Summary of the invention
The utility model technical matters to be solved is that a kind of measurement and control accuracy height, the effective direct-current traction power supply stray current control system of current drainage are provided.
The direct-current traction power supply stray current control system of the utility model is made up of high pressure major loop and low voltage control system; Said high pressure major loop includes the current drainage net that is connected DC traction power-supply system and copped wave resistance trimming unit, diode D, quick acting fuse F, on-load switch Q, the fixed current limiting resistance R between the negative busbar; Said low voltage control system includes the current measurement module and the voltage measurement module that can detect main circuit current and voltage; Also include the detection control system that can receive and handle current/voltage detection signal analog quantity, detect the resistance of the control signal output ends of control system through photoelectric isolation module and drive control circuit copped wave resistance trimming unit.
Said detection control system receives quick acting fuse state of switch amount signal through a switching value module.
The detection of said detection control system and result signal are output to display unit or Power SCADA system, also can be connected with the RS485 module.
The utility model has solved urban track traffic stray problem through the timely processing to stray current, through the system of the utility model, can improve the stray current survey precision, makes intelligent stream discharging system be operated in optimum regime.Avoid making by preventive device and receiving better protect because of train load changes crossing current drainage and owing the current drainage state of being occurred, peripheral system produces less interference simultaneously.
Description of drawings
Fig. 1 is the systematic schematic diagram of the utility model embodiment.
The specific embodiment
As shown in the figure, this direct-current traction power supply stray current control system is made up of high pressure major loop and low voltage control system; The high pressure major loop includes the current drainage net that is connected DC traction power-supply system and copped wave resistance trimming unit, diode D, quick acting fuse F, on-load switch Q, the fixed current limiting resistance R between the negative busbar; Low voltage control system includes the current measurement module and the voltage measurement module that can detect main circuit current and voltage; Also include the detection control system that can receive and handle current/voltage detection signal analog quantity, detect the resistance of the control signal output ends of control system through photoelectric isolation module and drive control circuit copped wave resistance trimming unit.Detect control system and can also receive quick acting fuse state of switch amount signal through a switching value module.The detection and the result signal that detect control system are output to display unit or Power SCADA system, also can be connected with the RS485 module, with other monitored control system communications.
Among the utility model embodiment: like Fig. 1, the system high pressure major loop is through diode D, and fixed current limiting resistance R, copped wave resistance trimming element make with track bonded assembly current drainage net to be connected with the negative busbar of traction substation, make that the stray current in the current drainage net flows back to negative busbar; During current drainage, stray current flows back to the negative busbar of traction substation through diode, fixed current limiting resistance, copped wave resistance trimming unit, current Hall sensor, quick acting fuse; Copped wave resistance trimming element is to compose in parallel adjustable current-limiting resistance by IGBT with big resistance resistors.For realizing reasonable and automatic current drainage function, drainage current can automatically adjust according to the height of polarization potential.When stray current is in rated range, normal drainage; When the stray current overrate,, under the situation that assurance current drainage element does not damage, can continue current drainage simultaneously, and produce alerting signal through the ON time of control IGBT; When drainage current during less than specified drainage current, the stray current control housing recovers normal current drainage state automatically.
The characteristics of present embodiment and ins and outs: detect control system and adopt the PLC control unit, and constitute copped wave resistance trimming unit by IGBT with big resistance resistors, automatically regulating drainage current value possesses and the electric power monitoring system communication function, supports MODBUS-RTU; Touch screen display unit shows drainage current, magnitude of voltage in real time, and alerting signal can transmit to control center; The function of integrated amperemeter/ammtr, overcurrent relay and the time relay in the past of Hall current transformer, controller and touch screen display unit; When measuring stray current excessive then startup protection and warning and uploading SCADA, also can be connected communication with other monitored control systems through the RS485 module.
Claims (4)
1. direct-current traction power supply stray current control system, it is characterized in that: it is made up of high pressure major loop and low voltage control system; Said high pressure major loop includes the current drainage net that is connected DC traction power-supply system and copped wave resistance trimming unit, diode D, quick acting fuse F, on-load switch Q, the fixed current limiting resistance R between the negative busbar; Said low voltage control system includes the current measurement module and the voltage measurement module that can detect main circuit current and voltage; Also include the detection control system that can receive and handle current/voltage detection signal analog quantity, detect the resistance of the control signal output ends of control system through photoelectric isolation module and drive control circuit copped wave resistance trimming unit.
2. direct-current traction power supply stray current control system according to claim 1 is characterized in that: said detection control system receives quick acting fuse state of switch amount signal through a switching value module.
3. direct-current traction power supply stray current control system according to claim 1 and 2 is characterized in that: the detection of said detection control system and result signal are output to display unit or Power SCADA system.
4. direct-current traction power supply stray current control system according to claim 1 and 2 is characterized in that: the detection of said detection control system is connected with the RS485 module with the result signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205214244U CN202541351U (en) | 2011-12-14 | 2011-12-14 | Stray current control system for DC (direct current) traction power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205214244U CN202541351U (en) | 2011-12-14 | 2011-12-14 | Stray current control system for DC (direct current) traction power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202541351U true CN202541351U (en) | 2012-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205214244U Expired - Fee Related CN202541351U (en) | 2011-12-14 | 2011-12-14 | Stray current control system for DC (direct current) traction power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202541351U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103241138A (en) * | 2013-04-24 | 2013-08-14 | 西南交通大学 | Low-frequency traction power supply system |
| CN106585430A (en) * | 2016-12-16 | 2017-04-26 | 中国航空油料有限责任公司 | Electric drainage device used between buried oil gas pipeline and subway and use method of electric drainage device |
| CN109094427A (en) * | 2018-08-23 | 2018-12-28 | 南京铁道职业技术学院 | Metro stray current based on voltage compensation inhibits system and method |
-
2011
- 2011-12-14 CN CN2011205214244U patent/CN202541351U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103241138A (en) * | 2013-04-24 | 2013-08-14 | 西南交通大学 | Low-frequency traction power supply system |
| CN103241138B (en) * | 2013-04-24 | 2015-07-08 | 西南交通大学 | Low-frequency traction power supply system |
| CN106585430A (en) * | 2016-12-16 | 2017-04-26 | 中国航空油料有限责任公司 | Electric drainage device used between buried oil gas pipeline and subway and use method of electric drainage device |
| CN106585430B (en) * | 2016-12-16 | 2023-11-07 | 中国航空油料有限责任公司 | Drainage device for buried oil gas pipeline and subway and use method thereof |
| CN109094427A (en) * | 2018-08-23 | 2018-12-28 | 南京铁道职业技术学院 | Metro stray current based on voltage compensation inhibits system and method |
| CN109094427B (en) * | 2018-08-23 | 2023-09-22 | 南京铁道职业技术学院 | Subway stray current suppression system and method based on voltage compensation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20181214 |