CN103809060A - Data collection terminal and station area low-voltage zero line current leakage detection system using the same - Google Patents
Data collection terminal and station area low-voltage zero line current leakage detection system using the same Download PDFInfo
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- CN103809060A CN103809060A CN201210436557.0A CN201210436557A CN103809060A CN 103809060 A CN103809060 A CN 103809060A CN 201210436557 A CN201210436557 A CN 201210436557A CN 103809060 A CN103809060 A CN 103809060A
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Abstract
The invention relates to a power monitoring device, in particular to a fault detection device for current leakage of a station area zero line in the power industry. A data collection terminal comprises a collection unit, a communication module A and a power supply A, wherein the power supply A supplies the power to the collection unit and the communication module; the collection unit comprises a mutual inductance element and a collection module, the mutual inductance element transmits the collected data to the collection module, the collection module processes the data collected by the mutual inductance element and transmits the data to the communication module A. The station area low-voltage zero line current leakage detection system using the same comprises a station area fixation terminal and a data collection terminal, wherein the data collection terminal is arranged between a station area transformer and a user access point, the station area fixation terminal is connected with the transformer with broken zero line, and the data collection terminal is communicated with the station area fixation terminal by ZigBee. The fault point of the current leakage is quickly found out, and the troubleshooting time is shortened.
Description
Technical field
The present invention relates to power monitoring equipment, relate in particular to the fault detect that is applied to the zero line electric leakage of power supply industry platform district, be specially a kind of platform district low-voltage zero line current leakage detection system and detection method.
Background technology
In low-voltage distribution system, installing aftercurrent action protecting equipment is to prevent from directly contacting one of shock hazard and indirect contact shock hazard generation effective measures; also be to prevent that electric wiring or electrical equipment grounding fault from causing the technical measures of electrical fire and electrical equipment damage accident, old family can effectively protect the person and property safety with final stage residual current operated protective device and substation transformer one-level aftercurrent action protecting equipment bringing normally into operation.
At present because of reasons such as aging circuit, insulating property reduction, electrical equipment electric leakages in household; rural subscribers are privately by out of service family expenses final stage residual current operated protective device for part, thereby cause substation transformer one-level aftercurrent action protecting equipment frequent movement, directly affect the normal electricity consumption of other users in Liao Tai district.
To live wire, electric leakage designs the earth leakage protection spininess of prior art, is blank substantially for the detection of electrical leakage of zero line.Thereby, if there is the eliminating that requires a great deal of time of zero line in Tai district.
2010, according to the Xu Xia of Jiangyin City visitor power supply station's platform district earth leakage protective device trouble shooting time statistics, 194 (inferior) of tripping operation that break down the whole year, because of zero line electric leakage 86 (inferior) of tripping operation that break down, accounted for 44.33% of annual CCS casual clearing station time; The time that wherein inspection of zero line leakage current spends is relatively long, average 102 minutes.
Concrete fault is investigated and prosecuted and is added up chronological classification as follows:
| Fault type | The investigation time | Hundred ratios | Accumulative total hundred ratios |
| Zero line electric leakage | 1738 minutes | 67.89% | 67.89% |
| Live wire electric leakage | 572 minutes | 22.34% | 90.23% |
| Earth leakage protective device fault | 182 minutes | 7.11% | 97.34% |
| Contactor fault | 68 minutes | 2.66% | 100% |
| Add up to | 2560 minutes | 100% | ? |
At present, in wide rural power distribution platform district, power supply station searches that leak current fault difficulty is large, the time is long, for the detection of low-voltage zero line electric leakage, also there is no effective, economic scheme.
Summary of the invention
One of goal of the invention of the present invention is to provide a kind of for all data collection stations of image data freely of differing heights.
One of goal of the invention of the present invention is to provide a kind of zero line of locating rapidly the trouble spot of leaking electricity occurs, and on-the-spot electrician and inspection center's Tai district low-voltage zero line current leakage detection system are implemented to pass in the trouble spot of raw electric leakage and investigation data.
Another goal of the invention of the present invention is to provide the detection method of a kind of district's low-voltage zero line electric leakage.
One of object of the present invention is achieved by the following technical solution:
A kind of data collection station, described data collection station comprises collecting unit, communication module first and power supply first; Described power supply first is described collecting unit and the power supply of described communication module; Described collecting unit comprises mutual-inductance element and acquisition module, and the data of collection are sent to described acquisition module by described mutual-inductance element, and described acquisition module will be sent to described communication module first after the data processing of described mutual-inductance element collection.
Described mutual-inductance element is connected with described acquisition module, described communication module and described power supply first by connecting link.And described connecting link is the telescopic connecting link that can change length.
One of object of the present invention is achieved by the following technical solution:
A kind of platform district low-voltage zero line current leakage detection system, comprise platform district fixed terminal and data collection station two parts, described data collection station is located at platform district transformer and user connects between the point of family, and described data collection station comprises collecting unit, communication module first and power supply first; Described power supply first is described collecting unit and the power supply of described communication module; Described collecting unit comprises mutual-inductance element and acquisition module, the data of collection are sent to described acquisition module by described mutual-inductance element, described acquisition module will be sent to described communication module first after the data processing of described mutual-inductance element collection, data after treatment described acquisition module are sent to described district's fixed terminal by described communication module first; Described district's fixed terminal is to the electric leakage data analysis and the transmission that gather;
Described district's fixed terminal is connected with the transformer that disconnects zero line, and described district's fixed terminal comprises communication module second, analysis module and power supply, and described power supply second is described communication module second and the power supply of described analysis module; The data that described analysis module transmits described communication module first are processed, and return to described data collection station;
Described data collection station is connected by ZigBee communication with described district's fixed terminal.
Further, described data collection station and described district's fixed terminal are equipped with WiFi or/and 3G communication interface.
Further, the communication interface of described data collection station and described district's fixed terminal is that GPRS is or/and GSM communication interface.
Further, described data collection station can be the each key point that is fixed on each district, also can be of portable form.
Another goal of the invention of the present invention is achieved in that
A kind of platform district low-voltage zero line electrical leakage detecting method, step is as follows:
1) Jiang Tai district transformer disconnects zero line, then connects described district's fixed terminal; Described district's fixed terminal comprises communication module second, analysis module and power supply second; Described power supply second is given described communication module second and the power supply of described analysis module;
2) between the transformer of Tai district electrical network and user access point, be provided with data collection station, described data collection station comprises mutual-inductance element, acquisition module, communication module first and power supply first, and wherein said power supply first is described mutual-inductance element, described acquisition module, the power supply of described communication module first; Described mutual-inductance element is by the data transmission gathering in described acquisition module, and described acquisition module will be sent to described communication module first after described data processing, and data after treatment are sent to platform district fixed terminal by described communication module first; The data that described analysis module transmits described communication module first are processed, and return to described data collection station; Described portable analysing terminal is connected by ZigBee communication with described district's fixed terminal;
3) setting up the two the communication of described data collection station and described district's fixed terminal is connected;
4) be positioned at the middle of described district's fixed terminal and user access point, described data collection station is pinned to zero line, if voltage is not decayed between described data collection station and described district's fixed terminal, illustrate at described data collection station and described district's fixed terminal and do not leak electricity; If voltage attenuation is larger between described data collection station and described district's fixed terminal, illustrates at described data collection station and described district's fixed terminal and have electric leakage.
The achieved beneficial effect of the present invention is: can arrive the trouble spot of electric leakage by fast finding, reduce the time of looking up the fault.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 is platform of the present invention district low-voltage zero line current leakage detection system schematic diagram.
Fig. 2 voltage attenuation schematic diagram.
Fig. 3 is that platform of the present invention district low-voltage zero line current leakage detection system detects principle schematic.
Wherein:
1 district's fixed terminal, 11 power supply second, 12 communication module second, 13 analysis modules;
2 data collection stations, 21 mutual-inductance elements, 22 power supply first, 23 communication module first, 24 acquisition modules, 25 connecting links;
3 district's electrical networks, 31 electric poles.
Embodiment
For the beneficial effect of more properly describing the present invention and bringing, below in conjunction with accompanying drawing, the present invention is described further, but protection scope of the present invention is not limited to the content that embodiment is explained.
Known in conjunction with Fig. 1, Fig. 2, Fig. 3:
Platform district low-voltage zero line current leakage detection system, comprises platform district fixed terminal 1 and data collection station 2 two parts.
Platform district fixed terminal 1 is connected with the transformer that disconnects zero line, platform district fixed terminal 1 comprises communication module second 12, analysis module 13 and power supply second 11, power supply second 11 is stated analysis module 13 for communication module second 12 and is powered, communication module second 12 is passed in analysis module 13 after receiving the data that communication module first 23 sends, after the data that analysis module 13 receives communication module second 12 are processed and return to described data collection station 2;
When finding after electric leakage circuit, by the wireless short region communications protocol ZigBee of field level, and GPRS/GSM network, relevant data is transferred to platform district fixed terminal 1.So background partition fixed terminal 1 is to electrical leakage voltage data analysis, adopt binary tree back-track algorithm, there is the trouble spot of electric leakage in location fast, and investigation data are issued to described data collection station 2 and on-the-spot electrician by GSM, and upload data to data center by GPRS.
Utilize the situation method of monitor station of the present invention district electrical network zero line electric leakage as follows:
Platform district low-voltage zero line electrical leakage detecting method, step is as follows:
1) transformer is disconnected to zero line, then connect the accessory power supply of DC24/AC220, then connected unit district fixed terminal 1; Platform district fixed terminal 1 comprises communication module second 12, analysis module 13 and power supply second 11; Power supply second 11 powers to communication module second 12 and analysis module 13;
2) landing of Tai district electrical network 3 is provided with portable data collection station 2 between case and user access point.Data collection station 2 comprises mutual-inductance element 21, acquisition module 24, communication module first 23 and power supply first 22, and wherein power supply first 22 is powered for mutual-inductance element 21, acquisition module 24, communication module first 23; Mutual-inductance element 21 in acquisition module 24, is sent to platform district fixed terminal 1 by the data transmission receiving after the data processing that communication module first 23 gathers acquisition module 24;
3) the two is set up communication by ZigBee and connects to set up data collection station 2 Yu Tai district fixed terminals 1;
4) middle of Tai district fixed terminal 1 and user access point, data collection station 2 is pinned to zero line, pin zero line image data by mutual-inductance element 21, the voltage data that the voltage data Yu Tai district fixed terminal 1 that data collection station 2 is collected starts compares; If voltage is not decay between data collection station 2 Yu Tai district fixed terminals 1, illustrate in data collection station 2 not electric leakages of Yu Tai district fixed terminal 1; If have larger voltage attenuation between data collection station 2 Yu Tai district fixed terminals 1, illustrate between data collection station 2 Yu Tai district fixed terminals 1 and have electric leakage.
Wherein, data collection station 2 is provided with two pilot lamp, be respectively status lamp and morse signal light, when data collection station 2 Yu Tai district fixed terminals 1, the two is set up after communication connects, the morse signal light of data collection station 2 lights, and data collection station 2 enters duty, by mutual-inductance element 21 pick-up voltage data, and the data of picking up are passed to acquisition module 24, acquisition module 24 will pass through communication module first 23 by data transfer station district fixed terminal 1 after the data processing of collecting.
If status lamp lights, illustrate between Tai district fixed terminal 1 and data collection station 2 and exist and leak electricity; If status lamp does not work, illustrate between Tai district fixed terminal 1 and data collection station 2 and do not have electric leakage.
More than explanation is binary tree back-track algorithm.
As, need the faulty line ABCDE detecting, first determine that mid point is C point, Jiang Tai district fixed terminal 1 is fixed on A point, data collection station 2 is fixed on C point, if not electric leakage between AC, the status lamp of data collection station 2 does not work, and illustrates that leakage is between CE, data collection station 2 is moved to the upper above-mentioned steps that continues of mid point D of CE section, if the status lamp of data collection station 2 does not work, not electric leakage between AD is described, otherwise explanation leakage is between DE.
If platform district fixed terminal 1 is fixed on A point, data collection station 2 is fixed on C point, if there is electric leakage between AC, the status lamp of data collection station 2 lights.
As shown in Figure 2, the wire resistance of unit length is determined value, thereby is linear attenuation after voltage warp, and in the time there are the abnormal conditions such as electric leakage, voltage just there will be decay pattern of anomaly.
The resistance of supposing the electric wire of 100 meters is 0.5 ohm, and electric current is 100A, and in the time that the initial voltage electric current that is 10000V flows through electric wire, under normal circumstances, the magnitude of voltage measuring at the other end should be 9950V.(10000V – 100A ╳ 0.5 Ω=9950V) and when there is when electric leakage, its resistance value will exceed 0.5 Ω, the voltage recording must be less than 9950V.Suppose that trouble spot is X rice apart from check point.If the voltage recording at 100 meters of is 9000V, so: (9950 – 9000) ÷ 10000=X/100.By can be calculated, X=9.5.Be that trouble spot is estimated as 9.5 meters apart from check point.
As shown in Figure 3, also can be in each key point fixed installation data acquisition unit terminal in each district.This collector can be sent to platform district fixed test instrument terminal the status data of each key point by telecommunication mode.Once there is zero line electric leakage event, the data analysis that detector just can send according to the collector receiving, adopt binary tree back-track algorithm to locate fast the trouble spot that electric leakage occurs, and investigation data are issued to on-the-spot electrician by GSM, upload data to data center by GPRS.
Claims (7)
1. a data collection station, is characterized in that: described data collection station comprises collecting unit, communication module first and power supply first; Described power supply first is described collecting unit and the power supply of described communication module; Described collecting unit comprises mutual-inductance element and acquisition module, and the data of collection are sent to described acquisition module by described mutual-inductance element, and described acquisition module will be sent to described communication module first after the data processing of described mutual-inductance element collection.
2. a kind of data collection station according to claim 1, is characterized in that: described mutual-inductance element is connected with described acquisition module, described communication module and described power supply first by connecting link.
3. a kind of data collection station according to claim 2, is characterized in that: described connecting link is telescopic.
4. a kind of platform district low-voltage zero line current leakage detection system of a kind of data collection station described in right to use requirement 1 to 3 any one, comprises platform district fixed terminal and data collection station two parts, it is characterized in that:
Described data collection station is located at platform district and is landed case and user and connect between the point of family, and described data collection station comprises collecting unit, communication module first and power supply first; Described power supply first is described collecting unit and the power supply of described communication module; Described collecting unit comprises mutual-inductance element and acquisition module, the data of collection are sent to described acquisition module by described mutual-inductance element, described acquisition module will be sent to described communication module first after the data processing of described mutual-inductance element collection, data after treatment described acquisition module are sent to described district's fixed terminal by described communication module first;
Described district's fixed terminal is connected with the transformer that disconnects zero line, and described district's fixed terminal comprises communication module second, analysis module and power supply, and described power supply second is described communication module second and the power supply of described analysis module; The data that described analysis module transmits described communication module first are processed, and return to described data collection station;
Described data collection station is connected by ZigBee communication with described district's fixed terminal.
5. a kind of platform according to claim 4 district low-voltage zero line current leakage detection system, is characterized in that: described data collection station and described district's fixed terminal are equipped with WiFi or/and 3G communication interface.
6. a kind of platform according to claim 5 district low-voltage zero line current leakage detection system, is characterized in that: the communication interface of described data collection station and described district's fixed terminal is that GPRS is or/and GSM communication interface.
7.Yi Zhongtai district low-voltage zero line electrical leakage detecting method, is characterized in that: step is as follows;
One) Jiang Tai district transformer disconnects zero line, then Jie Tai district fixed terminal; Described district's fixed terminal comprises communication module second, analysis module and power supply second; Described power supply second is given described communication module second and the power supply of described analysis module;
Two) between the transformer of Tai district electrical network and user access point, be provided with data collection station, described data collection station comprises mutual-inductance element, acquisition module, communication module first and power supply first, and wherein said power supply first is described mutual-inductance element, described acquisition module, the power supply of described communication module first; Described mutual-inductance element is by the data transmission gathering in described acquisition module, and described acquisition module will be sent to described communication module first after described data processing, and data after treatment are sent to platform district fixed terminal by described communication module first; The data that described analysis module transmits described communication module first are processed, and return to described data collection station;
Described portable analysing terminal is connected by ZigBee communication with described district's fixed terminal;
Three) setting up the two the communication of described data collection station and described district's fixed terminal is connected;
Four) be positioned at the middle of described district's fixed terminal and user access point, described data collection station is pinned to zero line, if voltage is not decayed between described data collection station and described district's fixed terminal, illustrate at described data collection station and described district's fixed terminal and do not leak electricity; If voltage attenuation is larger between described data collection station and described district's fixed terminal, illustrates at described data collection station and described district's fixed terminal and have electric leakage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360236A (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | Quick detection complete device and method for electric leakage points of 0.4 kV overhead line |
| CN105738763A (en) * | 2016-02-16 | 2016-07-06 | 国家电网公司 | Low-voltage TT wiring system transformer area electric leakage point positioning method and special-purpose detection tool |
| CN105823959A (en) * | 2016-03-17 | 2016-08-03 | 杭州普安科技有限公司 | Android device-based power user mounting detection method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100575228B1 (en) * | 2003-09-25 | 2006-05-02 | 한전케이디엔 주식회사 | Personal digital assistant inspection system of power meter for using power line communication and inspection method thereof |
| CN2896633Y (en) * | 2006-04-05 | 2007-05-02 | 丁文军 | Residual current protector capable of wireless communicating |
| CN201315635Y (en) * | 2008-12-12 | 2009-09-23 | 宁夏电力公司超高压电网运行分公司 | High meter observation device |
| CN101593938A (en) * | 2009-03-20 | 2009-12-02 | 浙江昌泰科技股份有限公司 | Digitalized low-voltage comprehensive distribution box |
| CN101699707A (en) * | 2009-10-19 | 2010-04-28 | 中国电力科学研究院 | Distribution type method for protecting residual current of low voltage power supply system |
| CN102012447A (en) * | 2010-10-12 | 2011-04-13 | 邢台供电公司 | Telescopic clip-on ammeter |
| CN102221641A (en) * | 2011-04-07 | 2011-10-19 | 北京交通大学 | On-line monitoring system for leakage current of high-voltage power transmission line insulator |
| CN202916375U (en) * | 2012-11-05 | 2013-05-01 | 无锡赛克特信息科技有限公司 | Data collection terminal and station area low-voltage zero line current leakage detection system using the same |
-
2012
- 2012-11-05 CN CN201210436557.0A patent/CN103809060B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100575228B1 (en) * | 2003-09-25 | 2006-05-02 | 한전케이디엔 주식회사 | Personal digital assistant inspection system of power meter for using power line communication and inspection method thereof |
| CN2896633Y (en) * | 2006-04-05 | 2007-05-02 | 丁文军 | Residual current protector capable of wireless communicating |
| CN201315635Y (en) * | 2008-12-12 | 2009-09-23 | 宁夏电力公司超高压电网运行分公司 | High meter observation device |
| CN101593938A (en) * | 2009-03-20 | 2009-12-02 | 浙江昌泰科技股份有限公司 | Digitalized low-voltage comprehensive distribution box |
| CN101699707A (en) * | 2009-10-19 | 2010-04-28 | 中国电力科学研究院 | Distribution type method for protecting residual current of low voltage power supply system |
| CN102012447A (en) * | 2010-10-12 | 2011-04-13 | 邢台供电公司 | Telescopic clip-on ammeter |
| CN102221641A (en) * | 2011-04-07 | 2011-10-19 | 北京交通大学 | On-line monitoring system for leakage current of high-voltage power transmission line insulator |
| CN202916375U (en) * | 2012-11-05 | 2013-05-01 | 无锡赛克特信息科技有限公司 | Data collection terminal and station area low-voltage zero line current leakage detection system using the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360236A (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | Quick detection complete device and method for electric leakage points of 0.4 kV overhead line |
| CN105738763A (en) * | 2016-02-16 | 2016-07-06 | 国家电网公司 | Low-voltage TT wiring system transformer area electric leakage point positioning method and special-purpose detection tool |
| CN105738763B (en) * | 2016-02-16 | 2018-11-06 | 国家电网公司 | Low pressure TT wiring system taiwan areas electric leakage independent positioning method and special detection tool |
| CN105823959A (en) * | 2016-03-17 | 2016-08-03 | 杭州普安科技有限公司 | Android device-based power user mounting detection method |
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