CN104422854A - Method for positioning fault section of T-connection high-voltage power transmission line - Google Patents

Method for positioning fault section of T-connection high-voltage power transmission line Download PDF

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Publication number
CN104422854A
CN104422854A CN201310403036.XA CN201310403036A CN104422854A CN 104422854 A CN104422854 A CN 104422854A CN 201310403036 A CN201310403036 A CN 201310403036A CN 104422854 A CN104422854 A CN 104422854A
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CN
China
Prior art keywords
fault
transmission line
power transmission
localization
ultra
Prior art date
Application number
CN201310403036.XA
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Chinese (zh)
Inventor
黄松
邢铀
孔武
陈钦柱
姚冬
钱冠军
张国清
岳鑫桂
Original Assignee
海南电力技术研究院
武汉三相电力科技有限公司
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Application filed by 海南电力技术研究院, 武汉三相电力科技有限公司 filed Critical 海南电力技术研究院
Priority to CN201310403036.XA priority Critical patent/CN104422854A/en
Publication of CN104422854A publication Critical patent/CN104422854A/en

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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a method for positioning a fault section of a T-connection high-voltage power transmission line, belongs to the relevant technical field of power transmission line fault positioning, and particularly relates to a method for judging a fault section by using power frequency current detected by a distributed type traveling wave fault positioning device. The method is characterized in that a power frequency current measurement unit is additionally arranged on an original distributed type traveling wave fault positioning device comprising a power frequency current measurement unit; the two power frequency current measurement units are respectively mounted on two branch lines of a T joint; a position of a fault point is subjected to section positioning according to change features of a current peak value and a phase within a period before and after a fault moment. By the adoption of the method, the problem of a false fault point positioned by conventional traveling waves can be solved, and by reliable and accurate measurement of power frequency fault current, the fault positioning reliability is effectively improved.

Description

A kind of T connects ultra-high-tension power transmission line fault section localization method
Technical field
The present invention relates to transmission open acess field, specifically adopt distributed electrical flow measurement technology, utilize when line fault power current to connect ultra-high-tension power transmission line to T and carry out fault section location.
Background technology
When transmission line of electricity breaks down, carry out accurate localization of fault and be conducive to fast finding abort situation, restore electricity.Based on row ripple ranging technology distance accuracy high, be not subject to that system operation mode, transition resistance, CT are saturated, the impact of line distribution capacitance, one of popular research topic then becoming localization of fault, and to be widely applied on transmission line of electricity.
Although it is a kind of irregular wiring that transmission line of electricity T connects, due to great amount of investment can be saved, also obtain more application.Traditional Fault-Locating Test based on row ripple connects because row setback reflective relation is complicated on transmission of electricity link at T, and row setback reflection configuration is difficult to determine, is difficult to carry out fault and accurately locates, easily occur pseudo-fault point, and deciding field is also difficult to realize even sometimes.Travelling wave signal measurement more difficult than power frequency component, is more subject to electromagnetic interference (EMI) simultaneously.The Travelling Wave Fault Location of current T link is improve original Travelling Wave Fault Location technology mostly, only make use of travelling wave signal, its effect is not very desirable, easily there is pseudo-fault point, and when travelling wave signal is disturbed serious, localization of fault credible result degree is not high, cannot provide definite fault section, makes to recover line powering difficulty and strengthens.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, connects ultra-high-tension power transmission line for T, provides a kind of power current information that utilizes when fault to connect to T the method that ultra-high-tension power transmission line carries out fault section location.The Judging fault interval that its energy is simple and reliable, thus better realize accurate location T being connect to ultra-high-tension power transmission line.
The technical solution adopted for the present invention to solve the technical problems is: a kind of T connects ultra-high-tension power transmission line fault section localization method, and it is characterized in that, step is followed successively by:
1) at T link T contact, modified T is installed and connects ultra-high-tension power transmission line Location Equipment for Travel Wave.Modified T connects ultra-high-tension power transmission line Location Equipment for Travel Wave and is specially: on original main device of transmission line travelling wave localization of fault comprising power current measuring unit, install a power current measuring unit again additional, namely this device has two power current measuring units, by connecting line, the power current measuring sensor installed additional is incorporated into the main device of transmission line travelling wave localization of fault and carries out subsequent treatment, this main device is made up of MCU+FPGA controlled processing unit, measuring unit, gps clock module, GPRS communication module.The concrete grammar that modified T connects the installation of ultra-high-tension power transmission line Location Equipment for Travel Wave is: the main device of transmission line travelling wave localization of fault can be arranged on the arbitrary branch road of T contact, and another power current measuring sensor can be arranged on any branch road in other two branch roads.
2) according to the fault power frequency current signal obtained, before and after the fault moment of extraction fault phase, the power frequency current signal of each one-period, obtains amplitude and the phase place of current signal before and after fault moment;
3) T link fault section orientation criterion is adopted to carry out deciding field to fault.T link fault section orientation criterion is specially: get one-period waveform after fault moment, if two current waveform homophases, then fault occurs in the large branch road of amplitude; If two current waveforms are anti-phase, then fault occurs in the branch road not installing current measurement device.
Compared with prior art, a kind of T of the present invention connects ultra-high-tension power transmission line fault section localization method and says that the effect had is:
1, the device that this method adopts installs a power current measuring sensor again additional on the basis of original a set of transmission line travelling wave fault locator, and the cost that system increases is very little, and volume of transmitted data is also in tolerance interval simultaneously.
2, this method carry out fault section location use power current, it is little that the measurement of power current has error, the feature be not easily disturbed, compare row wave measurement reliability higher, even if thus when ripple signal of being expert at is disturbed serious or travelling wave signal disappearance, still the fault section that T connects ultra-high-tension power transmission line can be positioned, effectively improve the reliability of system.
3, after the application of the invention method positions the fault section that T connects ultra-high-tension power transmission line, recycling high frequency traveling wave signal is accurately located trouble spot, avoid tradition due to fault section fail to understand the row setback reflective relation caused be difficult to differentiate problem, make row ripple locate more accurately and reliably.
Accompanying drawing explanation
Fig. 1 is that a kind of T of the present invention meets the modified T that ultra-high-tension power transmission line fault section localization method uses and connects ultra-high-tension power transmission line Location Equipment for Travel Wave scheme of installation.
Wherein arrow is power current measuring sensor reference forward, and 1 is the main device of transmission line travelling wave localization of fault, and 2 is another current measurement device, and 2 introduce three railroad sections of the T-shaped transmission line of electricity of 1,3,4,5 difference by connecting line.
Fig. 2 is that a kind of T of the present invention connects ultra-high-tension power transmission line fault section localization method algorithm flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
The present invention proposes a kind of T and connects ultra-high-tension power transmission line fault section localization method, ultra-high-tension power transmission line Location Equipment for Travel Wave is connect by the modified T being arranged on T contact, power current waveform before and after the fault moment be recorded to is transferred to server end by wireless communication module, utilizes the interval that the power current localization of faults occurs.Because the present invention has certain requirement to the time, technology when generally need adopt GPS Global Positioning System (GPS) pair.Server end runs Travelling Wave Fault Location software.
It is as follows that a kind of T connects ultra-high-tension power transmission line fault section localization method step:
1) first modified T is installed and connects ultra-high-tension power transmission line Location Equipment for Travel Wave, as shown in Figure 1, the main device of transmission line travelling wave localization of fault (1) can be arranged on the arbitrary branch road of T contact, and another power current measuring sensor (2) can be arranged on any branch road in other two branch roads.Always main for transmission line travelling wave localization of fault device and another power current measuring sensor are arranged on respectively containing on power branch of T contact during installation.
2) according to two the fault power frequency current signal obtained, before and after the fault moment of extraction fault phase, the power frequency current signal of each one-period, obtains amplitude and the phase place of current signal before and after fault moment.
3) T link fault section orientation criterion is adopted.Get the current waveform that the main device of transmission line travelling wave localization of fault (1) and another power current measuring sensor (2) record with fault after one-period waveform differentiate:
If with one-period waveform homophase after fault, and one-period waveform after fault fault occurs in interval (3);
If with one-period waveform homophase after fault, and one-period waveform after fault fault occurs in interval (4);
If with after fault, one-period waveform is anti-phase, and fault occurs in interval (5).
The above embodiment only have expressed better embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (4)

1. T connects a ultra-high-tension power transmission line fault section localization method, and it is characterized in that, step is followed successively by: 1) install modified T at T link T contact and connect ultra-high-tension power transmission line Location Equipment for Travel Wave; 2) according to the fault power frequency current signal obtained, before and after the fault moment of extraction fault phase, the power frequency current signal of each one-period, obtains amplitude and the phase place of current signal before and after fault moment; 3) T link fault section orientation criterion is adopted to carry out deciding field to fault.
2. a kind of T according to claim 1 connects ultra-high-tension power transmission line fault section localization method, it is characterized in that: wherein step 1) in modified T connect ultra-high-tension power transmission line Location Equipment for Travel Wave concrete grammar and be, original main device of transmission line travelling wave localization of fault comprising power current measuring unit installs a power current measuring unit again additional, namely this device has two power current measuring units, by connecting line, the power current measuring unit installed additional is incorporated into the main device of transmission line travelling wave localization of fault and carries out subsequent treatment, this main device is by MCU+FPGA controlled processing unit, measuring unit, gps clock module, GPRS communication module is formed.
3. a kind of T according to claim 1 connects ultra-high-tension power transmission line fault section localization method, it is characterized in that: wherein step 1) in modified T connect ultra-high-tension power transmission line Location Equipment for Travel Wave install concrete grammar be, the main device of transmission line travelling wave localization of fault can be arranged on the arbitrary branch road of T contact, and another power current measuring sensor can be arranged on any branch road in other two branch roads.
4. a kind of T according to claim 1 connects ultra-high-tension power transmission line fault section localization method, it is characterized in that: wherein step 3) in T link fault section orientation criterion concrete grammar be, get one-period waveform after fault moment, if two current waveform homophases, then fault occurs in the large branch road of amplitude; If two current waveforms are anti-phase, then fault occurs in the branch road not installing current measurement device.
CN201310403036.XA 2013-08-30 2013-08-30 Method for positioning fault section of T-connection high-voltage power transmission line CN104422854A (en)

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Publication number Priority date Publication date Assignee Title
CN105137292A (en) * 2015-09-22 2015-12-09 国家电网公司 Direct-current signal intelligent acquiring device used for high-voltage cable fault positioning
CN105353275A (en) * 2015-12-02 2016-02-24 杭州务实科技有限公司 Economic 66kV band multi-branch line fault positioning method and system
CN106291256A (en) * 2016-09-30 2017-01-04 四川中光防雷科技股份有限公司 A kind of T-type line fault localization system and method
CN106646133A (en) * 2016-12-23 2017-05-10 国网山东省电力公司烟台供电公司 Regional power grid T line fault range-finding system based on generalized measurement
CN110954783A (en) * 2019-12-18 2020-04-03 山东山大电力技术股份有限公司 T-connection line fault location method and system based on location probability

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Publication number Priority date Publication date Assignee Title
CN105137292A (en) * 2015-09-22 2015-12-09 国家电网公司 Direct-current signal intelligent acquiring device used for high-voltage cable fault positioning
CN105137292B (en) * 2015-09-22 2017-12-26 国家电网公司 Direct current signal intelligent acquisition device for high-tension cable fault location
CN105353275A (en) * 2015-12-02 2016-02-24 杭州务实科技有限公司 Economic 66kV band multi-branch line fault positioning method and system
CN105353275B (en) * 2015-12-02 2018-08-24 杭州务实科技有限公司 A kind of economical 66kV bands multipoint line Fault Locating Method and system
CN106291256A (en) * 2016-09-30 2017-01-04 四川中光防雷科技股份有限公司 A kind of T-type line fault localization system and method
CN106646133A (en) * 2016-12-23 2017-05-10 国网山东省电力公司烟台供电公司 Regional power grid T line fault range-finding system based on generalized measurement
CN110954783A (en) * 2019-12-18 2020-04-03 山东山大电力技术股份有限公司 T-connection line fault location method and system based on location probability

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