CN105929307A - Current gatherer adaptive to traveling wave range finding demands - Google Patents
Current gatherer adaptive to traveling wave range finding demands Download PDFInfo
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- CN105929307A CN105929307A CN201610523927.2A CN201610523927A CN105929307A CN 105929307 A CN105929307 A CN 105929307A CN 201610523927 A CN201610523927 A CN 201610523927A CN 105929307 A CN105929307 A CN 105929307A
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- Prior art keywords
- module
- speed
- traveling wave
- signal
- fault
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
A current gatherer adaptive to traveling wave range finding demands relates to the current gatherer field. A rapid-acquiring and slow-emitting technique is employed to realize traveling wave range finding. According to the current gatherer adaptive to traveling wave range finding demands, a high-speed fault acquisition module is added in the current gatherer to properly transform FT3 fixed length frame format contents of GB/T18657.1 and high-speed fault data are placed in a redundant voltage channel in FT3frame format of a current transformer, so that low-speed acquired metering and protection data and high-speed acquired fault data are framed and sent to a merging unit. In this way, rapid-acquiring and slow-emitting of fault data is realized, and traveling wave range finding function is realized through the current transformer. Through an actual on-site experiment, effective traveling wave range finding can be realized beside completion of original measurement work. The current gatherer is applicable to realize traveling wave fault range finding.
Description
Technical field
The invention belongs to current collector technical field, particularly relate to a kind of current collector adapting to travelling wave ranging demand.
Background technology
Travelling wave ranging has become as one of indispensable standard configuration of transmission line of electricity.Travelling wave ranging can be to ultra-high-tension power transmission line
Fault be accurately positioned.For permanent fault, it is possible to shorten fault correction time, improve power supply reliability, reduce
Loss of outage；Most of position of failure point can be measured exactly for the transient fault of successful reclosing for accounting for,
Can distinguish is the fault that causes of lightning surge, or owing to line insulator is aging, under circuit branch swing that cause therefore
Barrier, to find accident potential in time, takes measure targetedly, it is to avoid accident occurs again, plays on-line monitoring
Effect.
Research electric mutual inductor technology of travelling wave ranging requirement be applicable to intelligent substation is the most necessary.State Power Corporation issues
Line fault range accuracy is proposed higher by " whole nation electric power dispatching system " 15 " the science and technology development planning outline " of cloth
Requirement, synthetic error will be within 1%.Carrying of transient measuring advantage in electric mutual inductor principle, beneficially travelling wave ranging precision
Height, but in the intelligent substation put into operation at present, electric mutual inductor meets the requirement of IEC60044 standard in design, does not but examine
Considering the requirement of travelling wave ranging, general sampling rate is at 4000Hz, and travelling wave ranging requires that employing rate should be not less than 500kHz.
Present case is, uses the intelligent substation of electric mutual inductor that traveling wave ranging device, research all cannot be applied to be applicable to intelligence
The electric mutual inductor technology that in transformer station, travelling wave ranging requires is the most necessary.
In recent years, during the iterative method of intelligent substation, electronic mutual inductor is used widely, electronic type electricity
Current transformer technology is the most ripe and obtains the gradually accreditation of use department, but realizes row ripple by electronic current mutual inductor
Fault localization does not obtain going deep into the research of reliability.The target of traveling wave fault location is carried out for realizing current transformer, as
The current collector of transformer core component, not only needs to reach basic metering, the collection of protection data, in addition it is also necessary to realize
The collecting work of fault traveling wave.Metering, protection data acquisition rate typically at below 10k/s, and the speed of high speed fault data
Rate is at more than 1M/s, it is achieved the collection of fault data, storage, and can be sent to along with low speed data carries out data framing
Combining unit.Therefore, " adopting slow sending out soon " technology is needed to realize traveling wave fault location in current collector.
Summary of the invention
It is an object of the invention to utilize " adopting slow sending out soon " technology to realize traveling wave fault location, existing offer one adapts to travelling wave ranging
The current collector of demand.
A kind of current collector adapting to travelling wave ranging demand, it includes: measures, protect low-speed module 1, failed row wave height
Speed module 2 and FPGA3；
Metering, protection low-speed module 1 include: measure, protect data low speed A/D modular converter 1-1, parameter configuration module
1-2 and ARM data processing module 1-3；
Fault traveling wave high-speed module 2 includes: traveling wave fault data high-speed A/D modular converter 2-1 and DDR SDRAM row ripple
Signal memory module 2-2；
FPGA3 includes: FT3 framing module 3-1, fibre optical transmission circuit module 3-2, traveling wave fault judge module 3-3, meter
Amount, protection data storage 3-4 and low speed A/D acquisition memory 3-5；
Metering, protection data low speed A/D modular converter 1-1 are for gathering the low speed signal in power circuit, traveling wave fault number
According to high-speed a/d modular converter 2-1 for gathering the high speed fault-signal in power circuit；
Metering, the low speed digital signal outfan of protection data low speed A/D modular converter 1-1 connect low speed A/D and gather storage
The low speed digital signal input of device 3-5, the storage signal output part of low speed A/D acquisition memory 3-5 connects ARM data
The storage signal input part of processing module 1-3, the parameter configuration signal output part of parameter configuration module 1-2 connects ARM data
The parameter configuration signal input part of processing module 1-3；
The high-speed digital signal outfan of traveling wave fault data high-speed A/D modular converter 2-1 connects traveling wave fault judge module 3-3
High-speed digital signal input, the buffered signal outfan of traveling wave fault judge module 3-3 connects DDR SDRAM row ripple
The buffered signal input of signal memory module 2-2；
The metering of ARM data processing module 1-3, protection signal output part connect metering, the meter of protection data storage 3-4
Amount, protection signal input part, measure, protect the metering of data storage 3-4, protection storage signal output part connection FT3
The metering of framing module 3-1, protection storage signal input part, the row ripple of DDR SDRAM travelling wave signal memory module 2-2
Fault-signal outfan connects the traveling wave fault signal input part of FT3 framing module 3-1, the framing of FT3 framing module 3-1
Signal output part connect fibre optical transmission circuit module 3-2 electric signal input end, fibre optical transmission circuit module 3-2 by optical signal with
The speed of 4M/s is sent to combining unit.
The length frame form of the FT3 that digital quantity frame format is GB/T18657.1 between current collector and combining unit, passes
Defeated medium is optical fiber, uses industrial standard UART circuitry to carry out asynchronous data stream communication, and each character is formed by 11,1
Individual start bit is " 0 ", 8 data bit, 1 even parity bit, and 1 stops position is " 1 ".
Metering, protection data low speed A/D modular converter 1-1 are ADS8568 chip, and maximum is capable of 8 passages and controls to adopt
Collection signal, it is possible to by the sampling channel number of ARM data processing module 1-3 configuration A/D conversion, sampling rate is 4k/s,
Sampling precision is 16bit.
Metering, protection data low speed A/D modular converter 1-1 gather the metering in power circuit, protection letter with the speed of 4k/s
Number, traveling wave fault data high-speed A/D modular converter 2-1 gathers the traveling wave fault signal in power circuit with the speed of 5M/s.
The invention has the beneficial effects as follows: protection, continuous data and the height that low speed can be gathered by the present invention by current collector
Speed fault data volleys, it is achieved that fault data " adopts slow sending out " soon, has reached current transformer traveling wave fault location target, has protected
Card gathers sample rate and is not less than 1MHz.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of current collector adapting to travelling wave ranging demand；
Fig. 2 is the process chart of traveling wave fault signal；
Fig. 3 is metering, the process chart of protection signal；
Fig. 4 is the signal processing flow figure of FPGA.
Detailed description of the invention
Detailed description of the invention one: illustrate present embodiment referring to figs. 1 through Fig. 4, a kind of adaptation described in present embodiment
The current collector of travelling wave ranging demand, it includes: measures, protect low-speed module 1, fault traveling wave high-speed module 2 and FPGA3；
Metering, protection low-speed module 1 include: measure, protect data low speed A/D modular converter 1-1, parameter configuration module
1-2 and ARM data processing module 1-3；
Fault traveling wave high-speed module 2 includes: traveling wave fault data high-speed A/D modular converter 2-1 and DDR SDRAM row ripple
Signal memory module 2-2；
FPGA3 includes: FT3 framing module 3-1, fibre optical transmission circuit module 3-2, traveling wave fault judge module 3-3, meter
Amount, protection data storage 3-4 and low speed A/D acquisition memory 3-5；
Metering, protection data low speed A/D modular converter 1-1 are for gathering the low speed signal in power circuit, traveling wave fault number
According to high-speed a/d modular converter 2-1 for gathering the high speed fault-signal in power circuit；
Metering, the low speed digital signal outfan of protection data low speed A/D modular converter 1-1 connect low speed A/D and gather storage
The low speed digital signal input of device 3-5, the storage signal output part of low speed A/D acquisition memory 3-5 connects ARM data
The storage signal input part of processing module 1-3, the parameter configuration signal output part of parameter configuration module 1-2 connects ARM data
The parameter configuration signal input part of processing module 1-3；
The high-speed digital signal outfan of traveling wave fault data high-speed A/D modular converter 2-1 connects traveling wave fault judge module 3-3
High-speed digital signal input, the buffered signal outfan of traveling wave fault judge module 3-3 connects DDR SDRAM row ripple
The buffered signal input of signal memory module 2-2；
The metering of ARM data processing module 1-3, protection signal output part connect metering, the meter of protection data storage 3-4
Amount, protection signal input part, measure, protect the metering of data storage 3-4, protection storage signal output part connection FT3
The metering of framing module 3-1, protection storage signal input part, the row ripple of DDR SDRAM travelling wave signal memory module 2-2
Fault-signal outfan connects the traveling wave fault signal input part of FT3 framing module 3-1, the framing of FT3 framing module 3-1
Signal output part connect fibre optical transmission circuit module 3-2 electric signal input end, fibre optical transmission circuit module 3-2 by optical signal with
The speed of 4M/s is sent to combining unit.
Present embodiment, in current collector, adds high speed fault collection module, the FT3 to GB/T18657.1 standard
Regular length frame format content make proper transformation, high speed fault data is placed in current transformer FT3 frame format superfluous
In remaining voltage channel, thus the fault data framing of metering, protection data and the high speed acquisition that can be gathered by low speed sends
To combining unit, it is achieved that " adopting slow sending out soon " of fault data, reach the function utilizing current transformer to realize travelling wave ranging.
Test through actual field, outside completing original measurement work, be capable of effective travelling wave ranging.
The 5MHz signal that traveling wave fault data high-speed A/D modular converter 2-1 gathers enters traveling wave fault judge module 3-3, OK
Original signal is sampled by ripple breakdown judge module 3-3 with 4KHz speed, is done by periodic signal before and after same phase region
Threshold decision, analyses whether line fault；The most also carry out signal caching with the speed of 5MHz.When threshold decision is tied
When fruit is for breaking down, buffered signal is sent to DDR SDRAM travelling wave signal storage mould by traveling wave fault judge module 3-3
Block 2-2 stores；When threshold decision result is not for breaking down, traveling wave fault judge module 3-3 is again to original signal
It is sampled judging, and signal caches, when inadequate buffer space, utilize current cache signal to be believed by caching before
Number cover.
Detailed description of the invention two: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, parameter configuration module 1-2 is that ethernet PHY circuit parameter configures mould
Block.
Detailed description of the invention three: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, the capacity of DDR SDRAM travelling wave signal memory module 2-2 is 32M.
Detailed description of the invention four: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, the digital quantity frame format between current collector and combining unit is
The length frame form of the FT3 of GB/T18657.1, transmission medium is optical fiber, uses industrial standard UART circuitry to carry out asynchronous
Data flow communication, each character is formed by 11, and 1 start bit is " 0 ", 8 data bit, 1 even parity bit, 1
Stopping position is " 1 ".
In present embodiment, do suitable adjustment according to the FT3 frame format of GB/T18657.1, it may be assumed that by traveling wave fault data
It is placed in the voltage data passage of redundancy in the FT3 frame format of original current transformer.
Detailed description of the invention five: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, traveling wave fault data high-speed A/D modular converter 2-1 is THS1408
Chip, maximum sampling rate is 8Msps, and sampling precision is 14bit.
Detailed description of the invention six: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, measuring, protecting data low speed A/D modular converter 1-1 is ADS8568
Chip, maximum is capable of 8 passages and controls to gather signal, it is possible to turned by ARM data processing module 1-3 configuration A/D
The sampling channel number changed, sampling rate is 4k/s, and sampling precision is 16bit.
Detailed description of the invention seven: present embodiment is to a kind of electricity adapting to travelling wave ranging demand described in detailed description of the invention one
Stream harvester is described further, and in present embodiment, measures, protects data low speed A/D modular converter 1-1 with 4k/s's
Speed gathers the metering in power circuit, protection signal, and traveling wave fault data high-speed A/D modular converter 2-1 is with the speed of 5M/s
Rate gathers the traveling wave fault signal in power circuit.
The foregoing is only the preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, any ripe
Know those skilled in the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should contain
Cover within protection scope of the present invention.
Claims (7)
1. the current collector adapting to travelling wave ranging demand, it is characterised in that it includes: measure, protect low-speed module
(1), fault traveling wave high-speed module (2) and FPGA (3)；
Metering, protection low-speed module (1) including: measure, protect data low speed A/D modular converter (1-1), parameter configuration
Module (1-2) and ARM data processing module (1-3)；
Fault traveling wave high-speed module (2) including: traveling wave fault data high-speed A/D modular converter (2-1) and DDR SDRAM
Travelling wave signal memory module (2-2)；
FPGA (3) including: FT3 framing module (3-1), fibre optical transmission circuit module (3-2), traveling wave fault judge module
(3-3), measure, protect data storage (3-4) and low speed A/D acquisition memory (3-5)；
Metering, protection data low speed A/D modular converter (1-1) are for gathering the low speed signal in power circuit, traveling wave fault
Data high-speed A/D modular converter (2-1) is for gathering the high speed fault-signal in power circuit；
Metering, the low speed digital signal outfan of protection data low speed A/D modular converter (1-1) connect low speed A/D and gather
The low speed digital signal input of memorizer (3-5), the storage signal output part of low speed A/D acquisition memory (3-5) is even
Connecing the storage signal input part of ARM data processing module (1-3), the parameter configuration signal of parameter configuration module (1-2) is defeated
Go out end and connect the parameter configuration signal input part of ARM data processing module (1-3)；
The high-speed digital signal outfan of traveling wave fault data high-speed A/D modular converter (2-1) connects traveling wave fault judge module
(3-3) high-speed digital signal input, the buffered signal outfan of traveling wave fault judge module (3-3) connects DDR
The buffered signal input of SDRAM travelling wave signal memory module (2-2)；
The metering of ARM data processing module (1-3), protection signal output part connect metering, protection data storage (3-4)
Metering, protection signal input part, measure, protect the metering of data storage (3-4), protection storage signal output part even
Meet the metering of FT3 framing module (3-1), protection storage signal input part, DDR SDRAM travelling wave signal memory module (2-2)
Traveling wave fault signal output part connect FT3 framing module (3-1) traveling wave fault signal input part, FT3 framing module (3-1)
Framing signal output part connect fibre optical transmission circuit module (3-2) electric signal input end, fibre optical transmission circuit module (3-2)
Optical signal is sent to combining unit with the speed of 4M/s.
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that parameter is joined
Putting module (1-2) is that ethernet PHY circuit parameter configures module.
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that DDR
The capacity of SDRAM travelling wave signal memory module (2-2) is 32M.
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that electric current is adopted
The length frame form of the FT3 that digital quantity frame format is GB/T18657.1 between storage and combining unit, transmission medium is light
Fibre, uses industrial standard UART circuitry to carry out asynchronous data stream communication, and each character is formed by 11, and 1 start bit is
" 0 ", 8 data bit, 1 even parity bit, 1 stops position is " 1 ".
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that row ripple event
Barrier data high-speed A/D modular converter (2-1) is THS1408 chip, and maximum sampling rate is 8Msps, and sampling precision is
14bit。
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that metering,
Protection data low speed A/D modular converter (1-1) is ADS8568 chip, and maximum is capable of 8 passages and controls to gather signal,
Can be by the sampling channel number of ARM data processing module (1-3) configuration A/D conversion, sampling rate is 4k/s, sampling
Precision is 16bit.
A kind of current collector adapting to travelling wave ranging demand the most according to claim 1, it is characterised in that metering,
Protection data low speed A/D modular converter (1-1) gathers the metering in power circuit, protection signal with the speed of 4k/s, OK
Ripple fault data high-speed a/d modular converter (2-1) gathers the traveling wave fault signal in power circuit with the speed of 5M/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610523927.2A CN105929307A (en) | 2016-07-05 | 2016-07-05 | Current gatherer adaptive to traveling wave range finding demands |
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| CN201610523927.2A CN105929307A (en) | 2016-07-05 | 2016-07-05 | Current gatherer adaptive to traveling wave range finding demands |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646118A (en) * | 2016-11-21 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | High-frequency data acquisition and transmission method and system used for travelling wave fault location |
| CN109212454A (en) * | 2018-08-22 | 2019-01-15 | 国网辽宁省电力有限公司电力科学研究院 | A kind of state monitoring method of the optical current mutual inductor based on FT3 frame format |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02105076A (en) * | 1988-10-14 | 1990-04-17 | Kansai Electric Power Co Inc:The | Fault point locating type traveling wave relay device |
| CN102033190A (en) * | 2010-11-12 | 2011-04-27 | 江西省电力科学研究院 | Traveling wave fault location method for transmission line based on electronic transformer |
| CN202720307U (en) * | 2012-08-29 | 2013-02-06 | 国家电网公司 | Electric power circuit fault traveling wave locating device |
| CN203490323U (en) * | 2013-08-05 | 2014-03-19 | 国网安徽省电力公司铜陵供电公司 | Electronic transformer-based travelling wave fault location system |
| CN104375018A (en) * | 2014-07-11 | 2015-02-25 | 国家电网公司 | Method for applying traveling wave fault location technology to electronic transformer intelligent transformer substation |
-
2016
- 2016-07-05 CN CN201610523927.2A patent/CN105929307A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02105076A (en) * | 1988-10-14 | 1990-04-17 | Kansai Electric Power Co Inc:The | Fault point locating type traveling wave relay device |
| CN102033190A (en) * | 2010-11-12 | 2011-04-27 | 江西省电力科学研究院 | Traveling wave fault location method for transmission line based on electronic transformer |
| CN202720307U (en) * | 2012-08-29 | 2013-02-06 | 国家电网公司 | Electric power circuit fault traveling wave locating device |
| CN203490323U (en) * | 2013-08-05 | 2014-03-19 | 国网安徽省电力公司铜陵供电公司 | Electronic transformer-based travelling wave fault location system |
| CN104375018A (en) * | 2014-07-11 | 2015-02-25 | 国家电网公司 | Method for applying traveling wave fault location technology to electronic transformer intelligent transformer substation |
Non-Patent Citations (1)
| Title |
|---|
| 董义华等: "适用于行波传变的电子式互感器信号采集与合并单元的设计与实现", 《电力自动化设备》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646118A (en) * | 2016-11-21 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | High-frequency data acquisition and transmission method and system used for travelling wave fault location |
| CN109212454A (en) * | 2018-08-22 | 2019-01-15 | 国网辽宁省电力有限公司电力科学研究院 | A kind of state monitoring method of the optical current mutual inductor based on FT3 frame format |
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