CN204631189U - Realize the device of distribution line failure travelling wave ranging high reliability - Google Patents
Realize the device of distribution line failure travelling wave ranging high reliability Download PDFInfo
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- CN204631189U CN204631189U CN201520235963.XU CN201520235963U CN204631189U CN 204631189 U CN204631189 U CN 204631189U CN 201520235963 U CN201520235963 U CN 201520235963U CN 204631189 U CN204631189 U CN 204631189U
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Abstract
The utility model relates to a kind of device realizing distribution line failure travelling wave ranging high reliability, belongs to Relay Protection Technology in Power System field.It comprises CPU (central processing unit), voltage and traveling wave sensor are connected CPU (central processing unit) respectively by row wave height speed data acquisition unit with three-phase main-frequency voltage collection circuit, CPU (central processing unit) is by communication unit and main website communication, and CPU (central processing unit) connects GPS or Big Dipper timing unit simultaneously.The utility model can provide less equipment volume, can be found out from interference row ripple by fault traveling wave accurately, and that avoids breaking down fails to report, misrepresents deliberately, and improves the reliability of fault localization equipment.
Description
Technical field
The utility model relates to a kind of device realizing distribution line failure travelling wave ranging high reliability, belongs to Relay Protection Technology in Power System field.
Background technology
The electric energy conveying of electric system is divided into transmission and disttrbution.Transmission line of electricity adopts high voltage (more than 110kV), distance (can reach hundreds of kilometer), and general without branch, neutral-point solid ground, directly trips after breaking down.Distribution line adopts mesolow (35kV, 10kV etc.), apart from short (tens or tens kilometers); General multiple-limb (especially 10KV circuit), many employing neutral points not direct grounding way (as through grounding through arc), does not trip after there is singlephase earth fault, but must repair as early as possible.
For high pressure long distance transmission line, there is now both-end method (D type) Traveling wave fault location system of comparative maturity.Two ends respectively configure a row ripple harvester, and device has strict time synchronized measure (as GPS), and in the record trouble wavefront moment, combined circuit length and wave velocity, can calculate fault distance.
For the distribution line network (complexity is neutral point not direct ground connection, multiple-limb, may is pole line/cable hybrid line) of complexity, simple both-end method is also inapplicable.
For distribution line failure, present common practices is: first route selection (draws road exclusive method, or through the instruction of Small Electric Current Earthing And Routing Device), artificial line walking (naked eyes, telescope or step on bar investigation) again, also more advanced low current grounding orientator is had, end of standing adds signal specific, and receive with receiver along the line, signal is trouble spot from the turning point had to nothing.Its shortcoming is: open line method can cause non-fault line to have a power failure; Small Electric Current Earthing And Routing Device kind and principle various, but route selection reliability is not very high; Artificial line walking at substantial time and manpower, also some situation can not find trouble spot by line walking; The problem of orientator is means of not finding range accordingly, and is a kind of fixed point means, during work relatively blindly, can only adopt 1/2 discrete method Step wise approximation, more loaded down with trivial details.Now also generally adopt fault detector scheme, indicator is hung on the line, and the fault detector between supply side to trouble spot has instruction action, does not have action after trouble spot, and during line walking, sight indicator approaches trouble spot.It is very effective to phase fault, but lower to the singlephase earth fault success ratio accounting for the fault overwhelming majority, and it act as fault segmentation, can not indicate concrete abort situation.
No matter be single-ended method travelling wave ranging or both-end method travelling wave ranging, in the distribution line of complexity runs, a large amount of non-faulting interference row ripples can be produced, if the threshold values depending on setting carries out the triggering of row ripple and record, if threshold value setting is too high, then very possible fault traveling wave also cannot correctly trigger, true fault row ripple if set too low, a large amount of invalid data will be obtained, although also may be included, but substantially cannot automatic rejection interference, by artificial selection also very unrealistic also not in time.
Utility model content
For the deficiency in solving the problems of the technologies described above, the purpose of this utility model is: provide one can overcome above-mentioned defect, from interference row ripple, effectively accurately can isolate the device of fault traveling wave.
Device provided by the utility model comprises CPU (central processing unit), voltage and traveling wave sensor are connected CPU (central processing unit) respectively by row wave height speed data acquisition unit with three-phase main-frequency voltage collection circuit, CPU (central processing unit) is by communication unit and main website communication, and CPU (central processing unit) connects GPS or Big Dipper timing unit simultaneously.
Described CPU (central processing unit), voltage and traveling wave sensor, three-phase main-frequency voltage collection circuit and other accessory circuit are powered by built-in power.
Described communication unit is mobile communication network.Also network service, optical networking, 3G, 4G etc. can be adopted.Compared with prior art, the utility model has following beneficial effect:
Can provide less equipment volume, can be found out from interference row ripple by fault traveling wave accurately, that avoids breaking down fails to report, misrepresents deliberately, and improves the reliability of fault localization equipment.
Accompanying drawing explanation
Fig. 1 the utility model frame principle figure;
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
Device as shown in Figure 1, comprise CPU (central processing unit), voltage and traveling wave sensor are connected CPU (central processing unit) respectively by row wave height speed data acquisition unit with three-phase main-frequency voltage collection circuit, CPU (central processing unit) is by communication unit and main website communication, and CPU (central processing unit) connects GPS or Big Dipper timing unit simultaneously.CPU (central processing unit) for collecting voltage and row wave datum, when three-phase main-frequency Voltage Drop, before and after CPU (central processing unit) intercepts with the time point of Voltage Drop one section of row wave datum as
+20ms, and these data are uploaded to main website by communication unit, find out fault traveling wave again by this section of row wave datum, and then ensure the accuracy of row wave datum.
The external pilot lamp of CPU (central processing unit), when Voltage Drop being detected, can bright light report to the police simultaneously.Dual prompting.
CPU (central processing unit), voltage and traveling wave sensor, three-phase main-frequency voltage collection circuit and other accessory circuit are powered by built-in power.Described communication unit is mobile communication network.Its built-in power can be AC/DC220V, voltage transformer (VT) is powered, solar powered.
In concrete use procedure:
By data collector Real-Time Monitoring distribution network three-phase phase voltage, and Real-time Collection voltage and row wave datum, when detecting that Voltage Drop arrives below the threshold values of setting, will in this moment
+power frequency phase voltage in the 20ms time, row wave datum lock and upload main website, and fault traveling wave is analyzed and drawn from the row ripple in this period of time.
Its theoretical foundation is: when singlephase earth fault occurs (accounting for 70% of line fault sum), faulted phase voltage falls, and healthy phases voltage raises; Double earthfault (accounting for 10%) and the phase-to phase fault (accounting for 10%) caused thereof, two faulted phase voltage all fall, and healthy phases voltage raises; Three phase short circuit fault is little, the equal Voltage Drop of three-phase; Disconnection fault does not almost have to consider.In most fault, all Voltage Drop occurs, the degree of Voltage Drop is relevant with ground connection transition resistance, and metallic earthing Voltage Drop is 0, and transition resistance is larger, falls degree less.The moment of Voltage Drop, fault traveling wave is to circuit two ends and then propagated by take-off point.And though load operation also can form row ripple, general energy is very low, and the voltage degree of depth can not be caused to fall.So using the criterion that Voltage Drop (and whether raising in conjunction with other phase voltages) occurs as fault, is the most reliable judgment mode.In this programme, power frequency phase voltage, row ripple in continuous collecting, once Voltage Drop to setting threshold values below, lock the power frequency phase voltage of a period of time before and after this moment, row wave datum and upload main website, by the comprehensive analytical calculation of main website.The data of this period will comprise power frequency and the row ripple information of fault certainly, and the reliability finding out fault traveling wave from the row wave datum of this period of time accurately increases greatly, effectively can reject the interference of other period interference row ripple.Wrong report is not failed to report yet.
Claims (3)
1. realize a device for distribution line failure travelling wave ranging high reliability, it is characterized in that,
Comprise CPU (central processing unit), voltage and traveling wave sensor are connected CPU (central processing unit) respectively by row wave height speed data acquisition unit with three-phase main-frequency voltage collection circuit, CPU (central processing unit) is by communication unit and main website communication, and CPU (central processing unit) connects GPS or Big Dipper timing unit simultaneously.
2. the device realizing distribution line failure travelling wave ranging high reliability according to claim 1, it is characterized in that, described CPU (central processing unit), voltage and traveling wave sensor, three-phase main-frequency voltage collection circuit and other accessory circuit are powered by built-in power.
3. the device realizing distribution line failure travelling wave ranging high reliability according to claim 1, is characterized in that, described communication unit is mobile communication network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520235963.XU CN204631189U (en) | 2015-04-18 | 2015-04-18 | Realize the device of distribution line failure travelling wave ranging high reliability |
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| CN201520235963.XU CN204631189U (en) | 2015-04-18 | 2015-04-18 | Realize the device of distribution line failure travelling wave ranging high reliability |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154107A (en) * | 2015-04-18 | 2016-11-23 | 山东安亚电子信息有限公司 | Distribution line failure travelling wave ranging high reliability method and device |
| CN106932689A (en) * | 2015-12-31 | 2017-07-07 | 淄博威特电气有限公司 | A kind of power cable fault voltage traveling wave distance-finding method |
| CN109470994A (en) * | 2018-11-09 | 2019-03-15 | 南京大贺电力科技有限公司 | Faulty line judgement system and method for power distribution network |
| CN118091329A (en) * | 2024-04-24 | 2024-05-28 | 上海海能信息科技股份有限公司 | Travelling wave trigger threshold dynamic adjustment method based on background interference level |
-
2015
- 2015-04-18 CN CN201520235963.XU patent/CN204631189U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154107A (en) * | 2015-04-18 | 2016-11-23 | 山东安亚电子信息有限公司 | Distribution line failure travelling wave ranging high reliability method and device |
| CN106932689A (en) * | 2015-12-31 | 2017-07-07 | 淄博威特电气有限公司 | A kind of power cable fault voltage traveling wave distance-finding method |
| CN109470994A (en) * | 2018-11-09 | 2019-03-15 | 南京大贺电力科技有限公司 | Faulty line judgement system and method for power distribution network |
| CN118091329A (en) * | 2024-04-24 | 2024-05-28 | 上海海能信息科技股份有限公司 | Travelling wave trigger threshold dynamic adjustment method based on background interference level |
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