CN205353273U - A distributed terminating set for distribution network phase to earth fault travelling wave location - Google Patents
A distributed terminating set for distribution network phase to earth fault travelling wave location Download PDFInfo
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- CN205353273U CN205353273U CN201620133057.3U CN201620133057U CN205353273U CN 205353273 U CN205353273 U CN 205353273U CN 201620133057 U CN201620133057 U CN 201620133057U CN 205353273 U CN205353273 U CN 205353273U
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- 238000005070 sampling Methods 0.000 abstract description 10
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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
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Abstract
The utility model discloses a distributed terminating set for distribution network phase to earth fault travelling wave location, including the mutual -inductor, analog -to -digital conversion's AD change -over panel is carried out the signal of mutual -inductor collection, radio communication board with the main website communication of finding range, the ARM system board, and power, include still that the data signal who handles process AD change -over panel carries out the DSP treater of sampling, and remove the unit of making an uproar to the FPGA that the data signal of DSP treater sampling carries out filtering, wherein, FPGA go to make an uproar unit and radio communication board signal connection, wherein, the AD change -over panel passes through difference transmission bus signal with the DSP treater and is connected. According to the utility model discloses a distributing type terminating set, through reasonable system architecture, data signal's the processing and the speed of transmission have obtained the guarantee, can satisfy the such high -speed sampling's of distribution lines bi -polar range finding occasion, all have the convenient characteristics of installation to transformer substation or outdoor overhead wire.
Description
Technical field
This utility model relates to a kind of distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location.
Background technology
Domestic power distribution network adopts neutral non-effective grounding mode mostly, and also referred to as small current neutral grounding mode, under this earthing mode when circuit generation singlephase earth fault, fault current relative load electric current is very faint, therefore often results in route selection or positions unsuccessfully.
Along with intelligent distribution network and distributed energy access in a large number, quick and precisely fault point demand is more and more urgent.Current small current line selection and range unit are arranged on transformer station mostly, utilize the current signal of the busbar voltage in station and each outlet circuit, monitoring fault, once startup separator filtering immediately of breaking down, then utilizes the current signal of all outlets of collection to complete location algorithm.
Owing to distribution line is complicated, there is a large amount of branch in circuit, and there is overhead lines combined with cable, if only relying on signal in station, locating effect is undesirable, and under the background that intelligent grid is built, reliability, precision that line fault is positioned by electrical department propose higher requirement.
Travelling wave ranging has developed into ripe at transmission line of electricity, but there is presently no practical on power distribution network, and main cause is that travelling wave ranging adopts dual ended manner mostly, and namely range unit is installed by the transformer station in circuit both sides, utilizes 2M real-time performance data communication between station.
Power distribution network network structure is different from transmission line of electricity, is mostly radial, and namely circuit one end is transformer station's other end is line end connection transformer, and current distribution network line end is not suitable for the termination of travelling wave ranging.
Utility model content
The purpose of this utility model is in that to provide a kind of distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location, the requirement that the traveling wave to meet signal high speed processing positions.
For this, this utility model provides a kind of distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location, including transformer, the signal of transformer collection is carried out the A/D change-over panel of analog digital conversion, radio communication plate with distance measurement Master station communication, ARM system plate, and power supply, also include the dsp processor that the digital signal processed through A/D change-over panel is sampled, and the FPGA denoising unit that is filtered of digital signal to dsp processor sampling, wherein, FPGA denoising unit is connected with radio communication partitioned signal, wherein, A/D change-over panel is connected by differential transfer bus signals with dsp processor.
Further, above-mentioned ARM system plate includes OMAP-L138 processor, and wherein, dsp processor is a built-in module in OMAP-L138 processor.
Further, above-mentioned distributed terminal device also includes the GPS second pulse time service plate to the offer time service of L138 processor.
Further, above-mentioned transformer includes current transformer and voltage transformer.
Further, above-mentioned power supply is ups power, and the lateral ups power of secondary of voltage transformer is powered.
Further, the modulate circuit that the analogue signal of transformer collection is nursed one's health before being additionally included in A/D change-over panel by above-mentioned distributed terminal device.
Further, above-mentioned FPGA denoising unit is FPGA Wavelet Denoising Method unit.
Further, above-mentioned radio communication plate is the wireless real-time Communication for Power plate of 4G.
According to distributed terminal device of the present utility model, obtain guarantee by rational system architecture, the process of digital signal and the speed of transmission, it is possible to meet the occasion of the such high-speed sampling of distribution line both-end distance measuring.It is mountable to power distribution network outdoor aerial line according to termination of the present utility model, is respectively provided with the convenient feature of installation for transformer station or outdoor aerial line.
Except purpose described above, feature and advantage, this utility model also has other purpose, feature and advantage.Below with reference to figure, this utility model is described in further detail.
Accompanying drawing explanation
The Figure of description constituting the part of the application is used for providing being further appreciated by of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the system architecture schematic diagram of the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to this utility model preferred embodiment；
Fig. 2 is the schematic diagram being applied to power distribution network according to this utility model for the distributed terminal device that one-phase earthing failure in electric distribution network traveling wave positions；
Fig. 3 is the change-over circuit one of the A/D change-over panel in the distributed terminal device positioned for one-phase earthing failure in electric distribution network traveling wave according to this utility model；And
Fig. 4 is the change-over circuit two of the A/D change-over panel in the distributed terminal device positioned for one-phase earthing failure in electric distribution network traveling wave according to this utility model.
Description of reference numerals
10, transformer；20, A/D change-over panel；
30, radio communication plate；40, ARM system plate；
50, power supply；60, dsp processor；
70, FPGA denoising unit；80, GPS second pulse time service plate；
11, current transformer；12, voltage transformer；
41, OMAP-L138 processor；42, arm processor；
100, termination；110, transformer station；
120, aerial line；130, distance measurement Master station.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
The termination of the correspondence problem to implement both-end traveling wave location is not had for solving distribution network line end, this utility model provides a kind of distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location, and the system new by framework adapts to high-speed sampling.This termination includes transformer 10, the signal that transformer 10 is gathered carries out the A/D change-over panel 20 of analog digital conversion, radio communication plate 30 with distance measurement Master station 130 communication, ARM system plate 40, and power supply 50, also include the dsp processor 60 that the digital signal processed through A/D change-over panel 20 is sampled, and the FPGA denoising unit 70 that is filtered of signal to dsp processor 60 sampling, wherein, FPGA denoising unit 70 is connected with radio communication plate 30 signal, wherein, A/D change-over panel 20 is connected by differential transfer bus (LVDS) signal with dsp processor 60.
According to termination of the present utility model, by adopting dsp processor 60 (digital signal processor), FPGA denoising unit 70 (Field-ProgrammableGateArray in its system architecture, field programmable gate array), the mode that is connected by differential transfer bus signals with dsp processor 60 of A/D change-over panel 20, the process of its digital signal and the speed of transmission obtain guarantee, it is possible to meet the occasion of the such high-speed sampling of distribution line both-end distance measuring.
According to termination of the present utility model, ARM system plate (also becomes ARM mainboard) and is preferably ARM minimum system plate, to reduce system complexity.
In use, as shown in Figure 2, termination 100 of the present utility model is installed on transformer station 110 and the aerial line 120 of institute's Monitoring Line, gather circuit AC signal, according to going out line length and branch's situation, determining distributed terminal device infield, each two termination can form a pair ranging data, utilizes both-end distance measuring algorithm to carry out fault distance calculating.
It is mountable to power distribution network outdoor aerial line according to termination of the present utility model, is respectively provided with the convenient feature of installation for transformer station or outdoor aerial line.
According in an embodiment of the present utility model, giving the scheme that the group of transformer 10 is joined, it includes current transformer 11 (CT) and voltage transformer 12 (PT), and then gathers the three-phase current of circuit, three-phase voltage AC signal respectively.
According in preferred embodiment one by one of the present utility model, it is achieved that the high-speed sampling of 1.25Mbps.
According to, in a preferred embodiment of the present utility model, giving the preferred version of system configuration, the master chip of ARM system plate 40 adopts OMAP-L138 processor 41, and wherein, dsp processor 60 is the processing module that OMAP-L138 processor 41 is built-in.So simplifying system architecture, system reliability improves.For simplicity, hereinafter referred to as L138 processor.
Above-mentioned L138 processor comprises arm processor, as built-in module, it is achieved the function such as control and monitoring to other devices.
According to, in a preferred embodiment of the present utility model, adopting GPS second pulse time service plate 80 to provide time service to L138 processor 41.The clock that this kind of time service mode can make distributed terminal device wide area gather synchronizes, the markers of filtering data is demarcated relatively reliable.
According in a preferred embodiment of the present utility model, power supply 50 is ups power (uninterruption power source), and the secondary side 220v voltage of so available voltage transformer 12 is charged, it is achieved make full use of.
The core texture of the preferred circuit giving A/D change-over panel of the present utility model, as it is shown on figure 3, use OPA2350 chip to provide operational amplifier function, the voltage x current input signal gathered by transformer amplifies, and provides AD reference voltage.As shown in Figure 4, using the differential A/D chip of 16bit one pole with LVDS, i.e. ADS8413 chip functions, be responsible for voltage, current signal are converted to 16bit digital signal, sampling rate is 1.25M.
Above-mentioned OMAP-L138 processor, OPA2350 chip, ADS8413 chip by Texas Instruments (TI) provide, can pass through city available from.
According in an alternative embodiment of the present utility model, it is provided that the modulate circuit plate that the signal before A/D change-over panel 20, transformer 10 gathered is nursed one's health.This modulate circuit plate is for being amplified the analogue signal of transformer collection waiting conditioning, and the signal to adapt to A/D change-over panel 20 inputs.
According in a preferred embodiment of the present utility model, FPGA denoising unit 70 is preferably FPGA Wavelet Denoising Method unit, namely utilizes scale programmable logic device FPGA to complete small echo and calculates in real time.Empirical tests, small echo processes the needs being especially suitable for both-end traveling wave method.
Both-end traveling wave method needs the transient process of accurate recording down going wave signal when fault traveling wave arrives measurement apparatus, and this process is very short, it is therefore desirable to adopt accurate starting algorithm to carry out fault initiating filtering.Owing to earth fault zero-sequence current is faint, the zero sequence current signal that institute's Monitoring Line gathers is easily by sound pollution, thus affecting start-up criterion.This utility model selects Wavelet noise-eliminating method that signal is carried out pretreatment.
According in an embodiment of the present utility model, in conjunction with distribution low current grounding transient signal feature, Wavelet Algorithm preferably employs DB2 wavelet transformation.The decomposition of wavelet transformation, the reconstruct number of plies are set to 5 layers.FPGA denoising unit is divided into this three part of forward wavelet module, threshold process module and reverse wavelet transform conversion module composition.Forward wavelet module completes each layer and decomposes, and institute's monitor signal is decomposed into low frequency and HFS.Threshold process module is responsible for filtering the high-frequency noise of each layer wavelet decomposition, and reverse wavelet transform conversion module completes reconstruct.
This utility model utilizes the FPGA with Wavelet Denoising Method function, has adapted to the denoising requirement of signal high speed processing.
Data after FPGA denoising cell processing are undertaken starting judgement by the L138 processor on ARM system plate.If it is determined that circuit has fault, the data after Wavelet Denoising Method of before and after fault 5 cycles are stamped markers, by radio communication plate 30, data are sent to the distance measurement Master station 130 in a distant place.
According in an embodiment of the present utility model, radio communication plate 30 is the wireless real-time Communication for Power plate of 4G.This 4G is wireless real-time Communication for Power plate can pass through city available from, this 4G is wireless, and real-time Communication for Power plate also can have and the function of 3G communication switching.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for a person skilled in the art, this utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection domain of the present utility model.
Claims (8)
1. for the distributed terminal device of one-phase earthing failure in electric distribution network traveling wave location, including transformer (10), the signal that described transformer (10) is gathered carries out the A/D change-over panel (20) of analog digital conversion, radio communication plate (30) with distance measurement Master station communication, ARM system plate (40), and power supply (50), it is characterized in that, also include the dsp processor (60) that the digital signal processed through described A/D change-over panel (20) is sampled, and FPGA denoising unit (70) that the digital signal that described dsp processor (60) sampled is filtered, wherein, described FPGA denoising unit (70) is connected with described radio communication plate (30) signal, wherein, described A/D change-over panel (20) is connected by differential transfer bus signals with described dsp processor (60).
2. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 1, it is characterized in that, described ARM system plate (40) includes OMAP-L138 processor (41), wherein, described dsp processor (60) is a built-in module in described OMAP-L138 processor (41).
3. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 2, it is characterised in that also include GPS second pulse time service plate (80) that time service is provided to described L138 processor (41).
4. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 2, it is characterised in that described transformer (10) includes current transformer (11) and voltage transformer (12).
5. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 4, it is characterized in that, described power supply (50) is ups power, and the lateral described ups power of secondary of described voltage transformer (12) is powered.
6. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 1, it is characterized in that, be additionally included in the modulate circuit that the analogue signal before described A/D change-over panel (20), described transformer (10) gathered is nursed one's health.
7. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 1, it is characterised in that described FPGA denoising unit (70) is FPGA Wavelet Denoising Method unit.
8. the distributed terminal device for one-phase earthing failure in electric distribution network traveling wave location according to claim 1, it is characterised in that described radio communication plate (30) is the wireless real-time Communication for Power plate of 4G.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620133057.3U CN205353273U (en) | 2016-02-22 | 2016-02-22 | A distributed terminating set for distribution network phase to earth fault travelling wave location |
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| CN201620133057.3U CN205353273U (en) | 2016-02-22 | 2016-02-22 | A distributed terminating set for distribution network phase to earth fault travelling wave location |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324421A (en) * | 2016-08-30 | 2017-01-11 | 国网山东省电力公司阳信县供电公司 | Electric leakage fault monitoring device for power grid transformer |
| CN106680668A (en) * | 2016-12-22 | 2017-05-17 | 国网冀北电力有限公司张家口供电公司 | Power distribution network single-phase earth fault on-line monitoring and positioning system |
| CN109446578A (en) * | 2018-09-28 | 2019-03-08 | 成都大公博创信息技术有限公司 | A kind of circuit design method of analog/digital and D/A converter |
| CN109521326A (en) * | 2018-11-15 | 2019-03-26 | 贵州电网有限责任公司 | A kind of Earth design method based on distribution circuit electric voltage distribution curve |
| CN109901014A (en) * | 2019-03-08 | 2019-06-18 | 西安交通大学 | The voltage waveform acquisition method and its monitoring system of power grid ground fault |
-
2016
- 2016-02-22 CN CN201620133057.3U patent/CN205353273U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324421A (en) * | 2016-08-30 | 2017-01-11 | 国网山东省电力公司阳信县供电公司 | Electric leakage fault monitoring device for power grid transformer |
| CN106324421B (en) * | 2016-08-30 | 2018-02-27 | 国网山东省电力公司阳信县供电公司 | A kind of network transformer leak current fault monitoring device |
| CN106680668A (en) * | 2016-12-22 | 2017-05-17 | 国网冀北电力有限公司张家口供电公司 | Power distribution network single-phase earth fault on-line monitoring and positioning system |
| CN109446578A (en) * | 2018-09-28 | 2019-03-08 | 成都大公博创信息技术有限公司 | A kind of circuit design method of analog/digital and D/A converter |
| CN109521326A (en) * | 2018-11-15 | 2019-03-26 | 贵州电网有限责任公司 | A kind of Earth design method based on distribution circuit electric voltage distribution curve |
| CN109521326B (en) * | 2018-11-15 | 2020-11-13 | 贵州电网有限责任公司 | Ground fault positioning method based on voltage distribution curve of distribution line |
| CN109901014A (en) * | 2019-03-08 | 2019-06-18 | 西安交通大学 | The voltage waveform acquisition method and its monitoring system of power grid ground fault |
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Effective date of registration: 20171129 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: Huainan Power Supply Company, State Grid Anhui Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Co-patentee after: NARI Technology Development Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: Huainan Power Supply Company, State Grid Anhui Electric Power Co., Ltd. Patentee before: State Grid Corporation of China Co-patentee before: Nanjing Nari Co., Ltd. |
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| TR01 | Transfer of patent right |