CN201478809U - Single-phase grounding line selection device for 20 kV power grid - Google Patents
Single-phase grounding line selection device for 20 kV power grid Download PDFInfo
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- CN201478809U CN201478809U CN 200920306763 CN200920306763U CN201478809U CN 201478809 U CN201478809 U CN 201478809U CN 200920306763 CN200920306763 CN 200920306763 CN 200920306763 U CN200920306763 U CN 200920306763U CN 201478809 U CN201478809 U CN 201478809U
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Abstract
The utility model relates to a single-phase grounding line selection device for a 20 kV power grid The single-phase grounding line selection device comprises a current collection unit for synchronously collecting and real-timely preprocessing zero-sequence current signals of each branch circuit in a distribution network, a voltage collection unit for synchronously collecting three-phase voltage and neutral-point voltage signals of the distribution network, a CAN bus connected with the current signal output terminal of the current collection unit and the voltage signal output terminal of the voltage collection unit, a central control unit for receiving the current signals and the voltage signals through the CAN bus, and an I/O interface connected with the central control unit for controlling the tripping of a relay so as to switch off a fault line. The device can real-timely monitor the basic electric parameters of the distribution network, such as three-phase voltage, current and harmonics, and can analyze the operation state of the power grid. When single-phase-to-ground fault occurs, the device can accurately and immediately select the faulty feed branch, and store the voltage and current data before and after the fault occurs as history records.
Description
Technical field
The utility model relates to a kind of 20KV electrical network single-phase grounding selecting device.
Background technology
When the neutral point of electric power system adopts the non_direct ground mode, be called as small current neutral grounding system.Because during power distribution network circuit single-phase earthing, the electric current of fault point is less, and the power supply three-phase line voltage still keeps symmetry, and therefore the electrical network rules allow to operate with failure 1～2 hour usually.But behind the single-phase earthing, non-fault phase voltage can raise, and expands as phase fault easily, has a strong impact on the stability of system.Require the operations staff to find out short circuit line and short dot as early as possible this moment, so that take Corresponding Countermeasures to remove fault, recovery system normally moves.Therefore be necessary to install additional high performance earthing wire-selecting protective device in the distribution network system, can get rid of single phase ground fault fast.
The utility model content
Technical problem to be solved in the utility model provides a kind of 20KV electrical network single-phase grounding selecting device that can get rid of single phase ground fault fast.
For solving the problems of the technologies described above, the utility model provides a kind of 20KV electrical network single-phase grounding selecting device, comprise: be used for the zero sequence current signal of each branch road of synchronous acquisition power distribution network and carry out real-time pretreated current acquisition unit, the three-phase voltage and the neutral point voltage voltage of signals collecting unit that are used for the synchronous acquisition power distribution network, the CAN bus that links to each other with the voltage signal output end of the current signal output end of current acquisition unit and voltage acquisition unit, be used for receiving by the CAN bus central control unit of current signal and voltage signal, central control unit is connected with and is used for the I/O interface of control relay tripping operation with the disengagement failure phase line.
Further, described central control unit also is connected with indicator light, display and the printer that is used to export electric network fault information.Described central control unit also is connected with the communication interface that is used for telecommunication.
The utlity model has positive effect: (1) 20KV electrical network of the present utility model single-phase grounding selecting device, adopt the master chip of the TMS320LF2407ADSP of TI company, made full use of dsp chip powerful operation capacity and plenty hardware resources as a whole set of distribution line-selected earthing device.Simultaneously also the CAN bussing technique is applied to field network communication, constitutes distributed data acquisition, fault monitoring system, improved the detection performance and the communication antijamming capability of line-selected earthing device.This device can be monitored basic electrical parameter such as three-phase voltage in the power distribution network, electric current, harmonic wave in real time, and can analyze the running status of power distribution network.When power distribution network generation single phase ground fault, this device can accurately and timely be selected the fault feeder branch road, and preserves voltage, current data before and after the fault moment, gives over to the historical record analysis.(2) general structure of this device adopts the distributed modular structure based on the CAN bus, be applicable to the small current neutral grounding system of 20kV and following electric pressure, mainly form by Elementary Function modules such as master controller, current acquisition unit, voltage acquisition unit and switching value 1O plates.Each network node is followed CAN bus application layer protocol in the device, realizes different functions respectively, constitutes whole distributed Earth Fault Detection network.
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 20KV electrical network single-phase grounding selecting device among the embodiment.
Embodiment
See Fig. 1, the 20KV electrical network single-phase grounding selecting device of present embodiment comprises: be used for the zero sequence current signal of each branch road of synchronous acquisition power distribution network and carry out real-time pretreated current acquisition unit 1, the three-phase voltage and the neutral point voltage voltage of signals collecting unit 4 that are used for the synchronous acquisition power distribution network, the CAN bus 2 that links to each other with the voltage signal output end of the current signal output end of current acquisition unit 1 and voltage acquisition unit 4, be used for the central control unit 3 by CAN bus 2 received current signals and voltage signal, central control unit 3 is connected with and is used for the I/O interface 6 of control relay tripping operation with the disengagement failure phase line.Described central control unit 3 also is connected with indicator light 12, display 8 and the printer 7 that is used to export electric network fault information.Central control unit 3 also is connected with the communication interface 11 that is used for telecommunication.
Current acquisition unit 1 adopts TMS320LF2407A as primary processor, is responsible for the zero sequence current signal of each branch road in the synchronous acquisition power distribution network, carries out real-time preliminary treatment, and failure condition is uploaded to master controller by the CAN network.10 ADC modules of current acquisition unit 1 built-in 16 passages and CAN controller, only need the branch road zero sequence current signal is inserted the pin of ADC module through signal condition path (comprise and isolate conversion, biasing amplification, filtering etc.) back, and external CAN controller, just can realize a current acquisition card based on the CAN bus network.Voltage acquisition unit is responsible for signals such as the three-phase voltage, neutral point voltage of synchronous acquisition power distribution network, its design principle and current acquisition unit class seemingly, only need extend out a slice AT45DB041B chip comes the storage failure recorder data.
The foregoing description only is for the utility model example clearly is described, 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 (3)
1. 20KV electrical network single-phase grounding selecting device, it is characterized in that comprising: be used for the zero sequence current signal of each branch road of synchronous acquisition power distribution network and carry out real-time pretreated current acquisition unit (1), the three-phase voltage and the neutral point voltage voltage of signals collecting unit (4) that are used for the synchronous acquisition power distribution network, the CAN bus (2) that links to each other with the voltage signal output end of the current signal output end of current acquisition unit (1) and voltage acquisition unit (4), be used for the central control unit (3) by CAN bus (2) received current signal and voltage signal, central control unit (3) is connected with and is used for the I/O interface (6) of control relay tripping operation with the disengagement failure phase line.
2. 20KV electrical network single-phase grounding selecting device according to claim 1 is characterized in that: described central control unit (3) also is connected with indicator light (12), display (8) and the printer (7) that is used to export electric network fault information.
3. 20KV electrical network single-phase grounding selecting device according to claim 1 is characterized in that: described central control unit (3) also is connected with the communication interface (11) that is used for telecommunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920306763 CN201478809U (en) | 2009-07-23 | 2009-07-23 | Single-phase grounding line selection device for 20 kV power grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920306763 CN201478809U (en) | 2009-07-23 | 2009-07-23 | Single-phase grounding line selection device for 20 kV power grid |
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| CN201478809U true CN201478809U (en) | 2010-05-19 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608500A (en) * | 2012-04-03 | 2012-07-25 | 云南电网公司玉溪供电局 | High-resistance, single-phase ground fault line selection device for distribution networks and starting method thereof |
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| RU2516371C1 (en) * | 2013-02-05 | 2014-05-20 | Общество с ограниченной ответственностью "Исследовательский центр "Бреслер" | Method for determination of damaged feeder at earth fault in distributing mains |
| CN103840438A (en) * | 2014-03-25 | 2014-06-04 | 浙江巨力电气有限公司 | Intelligent detecting system for detecting single phase grounding protection function of intelligent switch device based on 10kV neutral non-grounding distribution network system |
| CN104242271A (en) * | 2014-09-19 | 2014-12-24 | 国家电网公司 | Treatment method for 220 kV power grid line protection action refusing |
| CN104391219A (en) * | 2014-12-13 | 2015-03-04 | 国网山西省电力公司晋城供电公司 | Intelligent bus grounding warning device |
| CN104502797A (en) * | 2014-12-10 | 2015-04-08 | 安徽国科电力设备有限公司 | Auxiliary grid fault analysis system |
| CN110568312A (en) * | 2019-09-11 | 2019-12-13 | 中南大学 | Phase current distortion-based single-phase earth fault line selection method for neutral point ungrounded system |
-
2009
- 2009-07-23 CN CN 200920306763 patent/CN201478809U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608500A (en) * | 2012-04-03 | 2012-07-25 | 云南电网公司玉溪供电局 | High-resistance, single-phase ground fault line selection device for distribution networks and starting method thereof |
| CN102981105A (en) * | 2012-12-25 | 2013-03-20 | 南京因泰莱电器股份有限公司 | Low current earth routing system based on CAN |
| CN102981105B (en) * | 2012-12-25 | 2015-12-23 | 南京因泰莱电器股份有限公司 | Based on the Little Current Ground Connection System of CAN network |
| RU2516371C1 (en) * | 2013-02-05 | 2014-05-20 | Общество с ограниченной ответственностью "Исследовательский центр "Бреслер" | Method for determination of damaged feeder at earth fault in distributing mains |
| CN103840438A (en) * | 2014-03-25 | 2014-06-04 | 浙江巨力电气有限公司 | Intelligent detecting system for detecting single phase grounding protection function of intelligent switch device based on 10kV neutral non-grounding distribution network system |
| CN104242271A (en) * | 2014-09-19 | 2014-12-24 | 国家电网公司 | Treatment method for 220 kV power grid line protection action refusing |
| CN104502797A (en) * | 2014-12-10 | 2015-04-08 | 安徽国科电力设备有限公司 | Auxiliary grid fault analysis system |
| CN104502797B (en) * | 2014-12-10 | 2018-06-19 | 上海合凯电气科技有限公司 | Electric network fault Computer Aided Analysis System |
| CN104391219A (en) * | 2014-12-13 | 2015-03-04 | 国网山西省电力公司晋城供电公司 | Intelligent bus grounding warning device |
| CN110568312A (en) * | 2019-09-11 | 2019-12-13 | 中南大学 | Phase current distortion-based single-phase earth fault line selection method for neutral point ungrounded system |
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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: 20121016 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121016 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20160723 |