CN201498981U - 10KV Low-current grounding wire selection system - Google Patents
10KV Low-current grounding wire selection system Download PDFInfo
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- CN201498981U CN201498981U CN2009203067629U CN200920306762U CN201498981U CN 201498981 U CN201498981 U CN 201498981U CN 2009203067629 U CN2009203067629 U CN 2009203067629U CN 200920306762 U CN200920306762 U CN 200920306762U CN 201498981 U CN201498981 U CN 201498981U
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Abstract
The utility model relates to a 10KV low-current grounding wire selection system which comprises a central control unit, a data acquisition module connected with the central control unit and used for detecting the zero-sequence voltage and the zero-sequence current of a power network, a man-machine interface module connected with the central control unit and used for outputting the detected data and the wire selection result, a communication interface connected with the central control unit, and an I/O (input/output) interface connected with the central control unit and used for connecting the trip circuit of a relay. The data acquisition module comprises a signal modulation input circuit used for receiving an analog signal input, a low-pass filter circuit connected with the output terminal of the signal modulation input circuit, a multiplex analog switch circuit connected with the output terminal of the low-pass filter circuit, a sampling hold circuit connected with the output terminal of the multiplex analog switch circuit, and an A/D (analog to digital) conversion circuit connected with the output terminal of the sampling hold circuit, wherein the A/D conversion circuit is also connected with the central control unit.
Description
Technical field
The utility model relates to a kind of 10KV small current earthing wire-selecting system.
Background technology
The power distribution network of China adopts isolated neutral or through the mode of grounding through arc more. and during at system's single-phase earthing, the electric current of the fault point of flowing through is less, so be referred to as small current neutral grounding system.When permanent single-phase earthing takes place power distribution network,, need select faulty line and also be excised in order to prevent to cause fault to enlarge because of non-fault phase voltage raises.Traditional method is manually to try the backguy road one by one, and not only the reliability of influence power supply also may cause some artificial accidents sometimes.
The utility model content
Technical problem to be solved in the utility model provides a kind of 10KV small current earthing wire-selecting system that is suitable for selecting automatically the fault phase line.
For solving the problems of the technologies described above, the utility model provides a kind of 10KV small current earthing wire-selecting system, comprise: central control unit, being used to of linking to each other with central control unit are finished the data acquisition module that electrical network residual voltage and zero-sequence current detect, the human-machine interface module that is used for output test data and route selection result that links to each other with central control unit, the communication interface that links to each other with central control unit, the I/O interface that is used to be connected relay trip circuit continuous with central control unit.
Described data acquisition module comprises: the A/D change-over circuit that be used to receive the signal condition input circuit of analog signal input, the low-pass filter circuit that links to each other with the output of signal condition input circuit, the multi-channel analog switch circuit that links to each other with the output of low-pass filter circuit, the sampling hold circuit that links to each other with the output of multi-channel analog switch circuit, links to each other with the output of sampling hold circuit, the A/D change-over circuit links to each other with central control unit.
Described human-machine interface module comprises: the printer that links to each other with central control unit, display, keyboard and indicator light respectively.Described central control unit also is connected with the communication interface that is used for telecommunication.
The utlity model has positive effect: (1) 10KV small current earthing wire-selecting of the present utility model system, to install stablely, route selection is accurate, and adaptability is strong; Be not only applicable to isolated neutral electrical network or resistance grounded electrical network, and be applicable to the neutral by arc extinction coil grounding electrical network, have good popularizing application prospect.(2) data that in the utility model, the major function of man-machine interface is setup parameter (definite value), obtain detection and the result of route selection show, print, and important results shows with indicator light simultaneously; Relay tripping operation module comprises I/O output interface circuit and relay trip circuit, and this part circuit is optional, mainly is that the result with route selection exports tripping operation, and with the form output alarm of relay tip.Communication module can provide RS232 and RS485 communication interface.(3) in the utility model, convenience and the electromagnetic compatibility of selecting for use built-in PC mainly to be based on application and development are considered, because many manufacturers provide numerous and CPU, nest plate and peripheral relevant device the PC compatibility, and more alternative also just is provided, and are easy to control cost.In addition, centralized modular structure is easy to carry out the electromagnetic compatibility processing.Towards the software product of PC such as real-time operating system, device driver, function library, application program, developing instrument etc., very abundant: the upgrading of product maintenance and function is also very convenient.Built-in PC has the electric board (32M) of larger capacity, and also the storage for a large amount of image data provides convenience.In addition, built-in watchdog circuit can provide the replacement behind the system in case of system halt, has improved the reliability of system.(4) in the utility model, data acquisition system is the core of device.Consider that the real component method need gather the zero-sequence current of tens circuits and the residual voltage of several sections buses in the several seconds, the blanking time of data acquisition is short, so need the higher A/D converter of employing speed.The design adopts 12 A/D converter AD578 of representative products of high speed successive comparison A/D, reaches as high as 3s during its conversion, can satisfy line selection apparatus is gathered change-over time to data requirement.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein
Fig. 1 is the structural representation of the 10KV small current earthing wire-selecting system among the embodiment.
Embodiment
See Fig. 1, the 10KV small current earthing wire-selecting system of present embodiment comprises: central control unit 1, being used to of linking to each other with central control unit 1 are finished the data acquisition module that electrical network residual voltage and zero-sequence current detect, the human-machine interface module that is used for output test data and route selection result that links to each other with central control unit 1, the communication interface 11 that links to each other with central control unit 1, the I/O interface 13 that is used to be connected relay trip circuit 14 continuous with central control unit 1.
Described data acquisition module comprises: the A/D change-over circuit 2 that be used to receive the signal condition input circuit 6 of analog signal input, the low-pass filter circuit 5 that links to each other with the output of signal condition input circuit 6, the multi-channel analog switch circuit 4 that links to each other with the output of low-pass filter circuit 5, the sampling hold circuit 3 that links to each other with the output of multi-channel analog switch circuit 4, links to each other with the output of sampling hold circuit 3, A/D change-over circuit 2 links to each other with central control unit 1.
Described human-machine interface module comprises: the printer 7 that links to each other with central control unit 1, display 8, keyboard 10 and indicator light 12 respectively.Described central control unit 1 also is connected with the communication interface 11 that is used for telecommunication.
The foregoing description only is for clearly demonstrating the utility model example, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.
Claims (4)
1. 10KV small current earthing wire-selecting system, it is characterized in that comprising: central control unit (1), being used to of linking to each other with central control unit (1) are finished the data acquisition module that electrical network residual voltage and zero-sequence current detect, the human-machine interface module that is used for output test data and route selection result that links to each other with central control unit (1), with the continuous communication interface (11) of central control unit (1), the I/O interface (13) that is used to be connected relay trip circuit (14) continuous with central control unit (1).
2. 10KV small current earthing wire-selecting according to claim 1 system, it is characterized in that: described data acquisition module comprises: the signal condition input circuit (6) that is used to receive the analog signal input, the low-pass filter circuit (5) that links to each other with the output of signal condition input circuit (6), the multi-channel analog switch circuit (4) that links to each other with the output of low-pass filter circuit (5), the sampling hold circuit (3) that links to each other with the output of multi-channel analog switch circuit (4), with the A/D change-over circuit (2) that the output of sampling hold circuit (3) links to each other, A/D change-over circuit (2) links to each other with central control unit (1).
3. 10KV small current earthing wire-selecting according to claim 1 system, it is characterized in that: described human-machine interface module comprises: the printer (7) that links to each other with central control unit (1), display (8), keyboard (10) and indicator light (12) respectively.
4. 10KV small current earthing wire-selecting according to claim 1 system, it is characterized in that: described central control unit (1) also is connected with the communication interface (11) that is used for telecommunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203067629U CN201498981U (en) | 2009-07-23 | 2009-07-23 | 10KV Low-current grounding wire selection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203067629U CN201498981U (en) | 2009-07-23 | 2009-07-23 | 10KV Low-current grounding wire selection system |
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| Publication Number | Publication Date |
|---|---|
| CN201498981U true CN201498981U (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009203067629U Expired - Fee Related CN201498981U (en) | 2009-07-23 | 2009-07-23 | 10KV Low-current grounding wire selection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698345A (en) * | 2015-03-31 | 2015-06-10 | 襄阳科能机电设备有限公司 | Data acquisition and processing system for small current neutral grounding line selection |
| CN104793101A (en) * | 2015-02-03 | 2015-07-22 | 广西电网有限责任公司电力科学研究院 | Transient travelling wave small-current grounding line selection device and test method thereof |
| CN109596943A (en) * | 2018-12-26 | 2019-04-09 | 临涣焦化股份有限公司 | A kind of novel high-pressure Small Electric Current Earthing And Routing Device |
-
2009
- 2009-07-23 CN CN2009203067629U patent/CN201498981U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793101A (en) * | 2015-02-03 | 2015-07-22 | 广西电网有限责任公司电力科学研究院 | Transient travelling wave small-current grounding line selection device and test method thereof |
| CN104793101B (en) * | 2015-02-03 | 2017-10-24 | 广西电网有限责任公司电力科学研究院 | A kind of transient state travelling wave Small Electric Current Earthing And Routing Device |
| CN104698345A (en) * | 2015-03-31 | 2015-06-10 | 襄阳科能机电设备有限公司 | Data acquisition and processing system for small current neutral grounding line selection |
| CN109596943A (en) * | 2018-12-26 | 2019-04-09 | 临涣焦化股份有限公司 | A kind of novel high-pressure Small Electric Current Earthing And Routing Device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20120919 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120919 Address after: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee after: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee before: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20160723 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |