CN102590702A - Method and system for judging ground faults of medium and high voltage overhead transmission lines - Google Patents
Method and system for judging ground faults of medium and high voltage overhead transmission lines Download PDFInfo
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- CN102590702A CN102590702A CN2012100299512A CN201210029951A CN102590702A CN 102590702 A CN102590702 A CN 102590702A CN 2012100299512 A CN2012100299512 A CN 2012100299512A CN 201210029951 A CN201210029951 A CN 201210029951A CN 102590702 A CN102590702 A CN 102590702A
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- overhead transmission
- ftu
- alarm
- transmission line
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention provides a method and a system for judging ground faults of medium and high voltage overhead transmission lines. The system comprises a line fault indicator with an iron core. The line fault indicator is connected with a feeder terminal unit (FTU) which is connected with a primary station. The method for judging the ground faults includes that (1) if direct current voltage value is lowered to a set value, ground faults occur, the line fault indicator gives an alarm to the FTU through wireless signals, and the FTU sends alarm signals to the primary station through general packet radio service (GPRS) or code division multiple access (CDMA); and (2) if the direct current voltage value is not lowered to the set value, the ground faults do not occur, and the line fault indicator sends no alarm. The system and the method can detect variation conditions of the medium and high voltage overhead transmission lines in real time. By detecting voltage variation and matching with line current variation, the system and the method can judge the ground faults accurately, send the alarm to the primary station through a remote transmission device, are convenient in electric power dispatching management, find the faults timely, isolate the faults, and solve the faults.
Description
Technical field
The present invention relates to the determination methods and the judgement system of centering high voltage overhead line earth fault.
Background technology
In the power distribution management, if in a single day earth fault take place circuit, not only may cause very major accident, as: the line voltage distribution that links to each other raises and punctures, the sudden change of fault phase current, and the pedestrian gets an electric shock or the like, also reduces power supply quality greatly.Changeable because of ground fault condition simultaneously, as: direct ground connection, indirect earthed, arc grounding etc. cause the earth fault judging nicety rate not high.
On circuit in the past, a kind of indicating fault apparatus is installed, when line failure, device can board turning, the indication alarm, this device judgement earth fault can only according to circuit in short-term dash current judge.But in the on-the-spot actual use, effect is relatively poor, and can not differentiate earth fault and short trouble.Accurate if desired failure judgement also need know line voltage distribution, but pole line is unsettled arrangement, and not reference over the ground can't detect virtual voltage.Want the relative voltage amount for detecting, part producer is arranged, judge change in voltage through magnetic field at wireless device of floor mounted.Constantly like this increased cost and engineering complicated process, and be interfered easily.
Summary of the invention
First purpose of the present invention provides a kind of method of judging mesohigh overhead transmission line earth fault, and this method can detect the situation of change of mesohigh overhead transmission line voltage in real time.Through detecting change in voltage, cooperate the circuit change in current again, can accurately judge line-to-ground fault and alarm main website through sending on the remote transmission device, make things convenient for electric power dispatch management, in time find fault, isolated fault solves fault.
Second purpose of the present invention provides a kind of system of judging mesohigh power transmission line earth fault, and this system can detect the situation of change of mesohigh overhead transmission line voltage in real time.Through detecting change in voltage, cooperate the circuit change in current again, can accurately judge line-to-ground fault and alarm main website through sending on the remote transmission device, make things convenient for electric power dispatch management, in time find fault, isolated fault solves fault.
For reaching above-mentioned first purpose; A kind of method of judging mesohigh overhead transmission line earth fault; It is the cored line-failure indicator of mounting strap on the mesohigh overhead transmission line, and line-failure indicator is connected with FTU through wireless signal, and FTU connects main website through GPRS or CDMA;
Has exchange current on the mesohigh overhead transmission line; Thereby near the mesohigh overhead transmission line, produce alternating electromagnetic field; Alternating electromagnetic field impels the iron core in the line-failure indicator to produce the high frequency exchange current, and the high frequency exchange current converts DC voltage to through change-over circuit; The size of DC voltage is directly proportional with exchange current size on the mesohigh overhead transmission line, wherein, judges that the step of earth fault is:
When (1) being reduced to a setting value like the value of DC voltage; Illustrate and earth fault occurs; Then line-failure indicator sends alarm by wireless signal to FTU; FTU is sent to main website with alarm signal by GPRS or CDMA, the alarm that main website analysis-by-synthesis line-failure indicator sends, failure judgement place;
When (2) not being reduced to a setting value, explain earth fault not occur that then line-failure indicator is not done any alarm and sent like the value of DC voltage.
Said method is because therefore the alternating current cost on the size of DC voltage and the mesohigh overhead transmission line, can detect the situation of change of mesohigh overhead transmission line voltage in real time through line-failure indicator, FTU and main website.Through detecting dc voltage change, cooperate the circuit change in current again, can accurately judge line-to-ground fault and alarm main website through sending on the remote transmission device, make things convenient for electric power dispatch management, in time find fault, isolated fault solves fault.Because the high frequency exchange current is not easy to gather and handle, and therefore, need convert high-frequency alternating current to DC voltage, so that gather and handle, improves the accuracy of earth fault.
For reaching the second above-mentioned purpose; A kind of system of judging mesohigh overhead transmission line earth fault; It is the cored line-failure indicator of mounting strap on the mesohigh overhead transmission line, and line-failure indicator is connected with FTU through wireless signal, and FTU connects main website through GPRS or CDMA.
As improvement, the output terminal of iron core is provided with the interchange to-DC switching circuit.
The beneficial effect of earth fault of the present invention system is: can detect change in voltage owing to have the line-failure indicator of iron core; Cooperate the circuit change in current again; Can accurately judge line-to-ground fault and alarm main website, make things convenient for electric power dispatch management, in time find fault through sending on the remote transmission device; Isolated fault solves fault.Because what produce on the iron core is the high frequency exchange current, be not easy to gather and handle, therefore, the interchange to-DC switching circuit is set, convert high-frequency alternating current to DC voltage, so that gather and handle, improve the accuracy of earth fault.
Description of drawings
Fig. 1 is for judging the block scheme of mesohigh overhead transmission line earth fault system.
Fig. 2 is for judging the process flow diagram of mesohigh overhead transmission line earth fault method.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further elaborated.
As shown in Figure 1; The system of judging mesohigh overhead transmission line earth fault is included in the line-failure indicator of installing on the mesohigh overhead transmission line that has iron core 1; Line-failure indicator 1 is connected with FTU through wireless signal, and FTU connects main website 2 through GPRS or CDMA.
As shown in Figure 1, A, B, C represent bus, A
1, B
1, C
1The outlet of the expression first via, A
2, B
2, C
2Represent the second tunnel outlet, described line-failure indicator 1 is at A
1, B
1, C
1, A
2, B
2, C
2On all be equipped with.
The mesohigh overhead transmission line, that is, and A, B, C bus, A
1, B
1, C
1First via outlet, A
2, B
2, C
2Have exchange current in the second tunnel outlet, thereby at A, B, C bus, A
1, B
1, C
1First via outlet, A
2, B
2, C
2Produce alternating electromagnetic field near having exchange current in the second tunnel outlet, alternating electromagnetic field impels the iron core in the line-failure indicator to produce the high frequency exchange current, and the high frequency exchange current converts DC voltage to through change-over circuit; The size of DC voltage is directly proportional with exchange current size on the mesohigh overhead transmission line, wherein, judges that the step of earth fault is:
When (1) being reduced to a setting value like the value of DC voltage; Explain and earth fault occurs; Then line-failure indicator sends alarm through wireless signal to FTU; FTU is sent to main website with alarm signal through GPRS or CDMA, the alarm that main website analysis-by-synthesis line-failure indicator sends, failure judgement place.
When (2) not being reduced to a setting value, explain earth fault not occur that then line-failure indicator is not done any alarm and sent like the value of DC voltage.
Suppose C
1Ground connection, then C appear
1On line-failure indicator in DC voltage reduce by 70%, then line-failure indicator sends alarm through wireless signal to FTU, FTU is sent to main website with alarm signal through GPRS or CDMA; The alarm that main website analysis-by-synthesis line-failure indicator sends; The failure judgement place makes things convenient for electric power dispatch management, in time finds fault; Isolated fault solves fault.
Claims (3)
1. method of judging mesohigh overhead transmission line earth fault; It is characterized in that: the cored line-failure indicator of mounting strap on the mesohigh overhead transmission line; Line-failure indicator is connected with FTU through wireless signal, and FTU connects main website through GPRS or CDMA;
Has exchange current on the mesohigh overhead transmission line; Thereby near the mesohigh overhead transmission line, produce alternating electromagnetic field; Alternating electromagnetic field impels the iron core in the line-failure indicator to produce the high frequency exchange current, and the high frequency exchange current converts DC voltage to through change-over circuit; The size of DC voltage is directly proportional with exchange current size on the mesohigh overhead transmission line, wherein, judges that the step of earth fault is:
When (1) being reduced to a setting value like the value of DC voltage; Illustrate and earth fault occurs; Then line-failure indicator sends alarm by wireless signal to FTU; FTU is sent to main website with alarm signal by GPRS or CDMA, the alarm that main website analysis-by-synthesis line-failure indicator sends, failure judgement place;
When (2) not being reduced to a setting value, explain earth fault not occur that then line-failure indicator is not done any alarm and sent like the value of DC voltage.
2. system of judging mesohigh overhead transmission line earth fault; It is characterized in that: the cored line-failure indicator of mounting strap on the mesohigh overhead transmission line; Line-failure indicator is connected with FTU through wireless signal, and FTU connects main website through GPRS or CDMA.
3. the system of judgement mesohigh overhead transmission line earth fault according to claim 2, it is characterized in that: the output terminal of iron core is provided with the interchange to-DC switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100299512A CN102590702A (en) | 2012-02-10 | 2012-02-10 | Method and system for judging ground faults of medium and high voltage overhead transmission lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100299512A CN102590702A (en) | 2012-02-10 | 2012-02-10 | Method and system for judging ground faults of medium and high voltage overhead transmission lines |
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|---|---|
| CN102590702A true CN102590702A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100299512A Pending CN102590702A (en) | 2012-02-10 | 2012-02-10 | Method and system for judging ground faults of medium and high voltage overhead transmission lines |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501656A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of on-line acquisition system of distribution line failure waveform |
| CN106501657A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring system of electric distribution network overhead wire failure |
| CN106501671A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring method of electric distribution network overhead wire failure |
| CN106556754A (en) * | 2016-10-12 | 2017-04-05 | 国网上海市电力公司 | A kind of online acquisition method of distribution line failure waveform |
| CN106556766A (en) * | 2016-10-11 | 2017-04-05 | 国网上海市电力公司 | A kind of distribution network failure monitoring system based on distribution line multidate information |
| CN106569089A (en) * | 2016-10-11 | 2017-04-19 | 国网上海市电力公司 | Power distribution line dynamic Information-based power distribution network fault monitoring method |
| CN107765140A (en) * | 2017-12-06 | 2018-03-06 | 福建奥通迈胜电力科技有限公司 | Simple power distribution network active failure analysis method based on fault detector board turning Information Matrix |
| CN107942183A (en) * | 2017-10-23 | 2018-04-20 | 珠海许继芝电网自动化有限公司 | A kind of singlephase earth fault detection and localization processing method and its system |
-
2012
- 2012-02-10 CN CN2012100299512A patent/CN102590702A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556766A (en) * | 2016-10-11 | 2017-04-05 | 国网上海市电力公司 | A kind of distribution network failure monitoring system based on distribution line multidate information |
| CN106569089A (en) * | 2016-10-11 | 2017-04-19 | 国网上海市电力公司 | Power distribution line dynamic Information-based power distribution network fault monitoring method |
| CN106501656A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of on-line acquisition system of distribution line failure waveform |
| CN106501657A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring system of electric distribution network overhead wire failure |
| CN106501671A (en) * | 2016-10-12 | 2017-03-15 | 国网上海市电力公司 | A kind of monitoring method of electric distribution network overhead wire failure |
| CN106556754A (en) * | 2016-10-12 | 2017-04-05 | 国网上海市电力公司 | A kind of online acquisition method of distribution line failure waveform |
| CN107942183A (en) * | 2017-10-23 | 2018-04-20 | 珠海许继芝电网自动化有限公司 | A kind of singlephase earth fault detection and localization processing method and its system |
| CN107765140A (en) * | 2017-12-06 | 2018-03-06 | 福建奥通迈胜电力科技有限公司 | Simple power distribution network active failure analysis method based on fault detector board turning Information Matrix |
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Application publication date: 20120718 |