WO2021245511A1 - Localisateur de défaut de ligne - Google Patents

Localisateur de défaut de ligne Download PDF

Info

Publication number
WO2021245511A1
WO2021245511A1 PCT/IB2021/054682 IB2021054682W WO2021245511A1 WO 2021245511 A1 WO2021245511 A1 WO 2021245511A1 IB 2021054682 W IB2021054682 W IB 2021054682W WO 2021245511 A1 WO2021245511 A1 WO 2021245511A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
line
pulse generator
line fault
fault locator
Prior art date
Application number
PCT/IB2021/054682
Other languages
English (en)
Inventor
Sinn MEKKHACHAI
Sajjakorn RATTANAKORNROJ
Suwan PANSAMNEING
Anucha KOYANYONG
Siwadol BUTAKHIEO
Krittiya KITTIWITTAYAPONG
Wattana POONCHAIYAPHUM
Original Assignee
Electricity Generating Authority Of Thailand (Egat)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electricity Generating Authority Of Thailand (Egat) filed Critical Electricity Generating Authority Of Thailand (Egat)
Publication of WO2021245511A1 publication Critical patent/WO2021245511A1/fr

Links

Classifications

    • 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
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods

Definitions

  • This invention relates to a line fault locator.
  • Line Fault Locators are generally used to identify fault locations on power transmission lines that are installed in all areas of the country. Transmission lines have many types which are different in voltage level such as 115 kV, 230 kV, 500 kV including high voltage direct current (HVDC), some of which have distance over 300 kilometers. Faults usually happen on power transmission lines, which are generally caused by
  • weather conditions and environment e.g., heavy rains, thunderstorm, lightning strikes to transmission lines or electrical devices, trees falling on transmission lines, fallen power poles, broken power lines, or wildfires etc.
  • animals e.g., birds, cats, reptiles causing short circuit
  • Line fault locator assists in identifying points of line faults and calculating distance from the line fault locator which saves time from clearing faults in the power transmission system, resulting in quick fixing of electrical devices by the operators at the occurring location. As a result, the power transmission system can be restored faster.
  • line fault locators depending on the method of analyzing electromagnetic waves detected in the transmission lines when a fault occurs.
  • Type C Line Fault Locator (Type C LFL) with radar technique renders high precision by way of transmitting high-frequency waves into the transmission line and receiving the reflected signal from fault locating point.
  • Type C LFL calculates a gap distance between fault points and the location of Type C LFL.
  • Type C LFL has limitation as it must be used with line trap or blocking coil which is a resonance circuit installed on high voltage transmission lines to prevent a high-frequency signal from the power line communication system from interrupting an operation of a protection system in a substation.
  • the line trap allows Type C LFL to transmit a pulse signal to determine the distance of the fault occurred in the transmission line.
  • JP 17170882 A discloses an improvement in reliability of fault point locating device to withstand high voltage by separating circuit parts.
  • the fault point locating device according to JP 17170882 A must still work with blocking coils BC1 BC2 BC3 (or line traps).
  • Cispheral Patent Application Publication No. CN 107918079 A discloses a method of transmitting frequencies into transmission lines one phase at a time through the high-voltage switches that are connected to three-phase transmission lines of each phase. Then, a detector device connected to transmission line at another location receives signals through a high-voltage transformer connected to the transmission line and calculates to identify the fault location. According to CN 107918079 A, only a single-phase earth fault can be detected.
  • the detection apparatuses cannot perform as both transmitter and receiver. They will be inoperable if the communication failure occurs. Up to three very expensive, high-voltage switches are also required to be connected to the transmission lines.
  • Figure 4 shows the connection of the typical line fault locator to the power transmission system with line traps that comprises a Phase A voltage transformer 10', a Phase B voltage transformer 11', and a Phase C voltage transformer 12' connected to a Phase A transmission line 13, a Phase B transmission line 14, and a Phase C transmission line 15, respectively, with three line traps 22 at the primary power substation 23.
  • the structure of this power transmission system is costly.
  • Figure 4 also shows an example of an occurrence of a fault 25.
  • the line fault locator comprises a plurality of pulse generator, an interface unit, an alarm unit, a display unit, and a processor connected to the plurality of pulse generators, the interface unit, the alarm unit, and the display unit, respectively; wherein the line fault locator is a radar type line fault locator for identifying line fault location on transmission lines without a line trap; wherein the line fault locator further comprises a GPS satellite receiver connected to the processor; and wherein the plurality of pulse generators comprising a Phase A pulse generator, a Phase B pulse generator, and a Phase C pulse generator connected to the processor, preferably, said Phase A pulse generator, Phase B pulse generator, and Phase C pulse generator generates power transmission line test signals with frequency of 80 - 500 kHz, the signal transmitting interval of 20 - 50 microseconds, the signal voltage level of 0.6 - 1.2 kilovoltage, and output impedance of 300 - 600 ohms.
  • the purpose of this invention is to provide improved line fault locator having several technical advantages.
  • Technical advantages of the line fault locator according to this invention include an ability to operate with transmission lines without a line trap, an applicability with all voltage level of the transmission lines, an ability to detect signals quickly, an ability to process line fault location quickly and precisely, an ability to receive remote operation commands, an ability to identify cause of the fault each time, an ability to test power transmission system manually, and an ability to detect fault location in the blind zone.
  • FIG 1 shows components of the line fault locator according to this invention.
  • Figure 2 shows a connection of one line fault locator according to this invention to the power transmission system.
  • Figure 3 shows a connection of two line fault locators according to this invention to the power transmission system.
  • Figure 4 shows a connection of a typical line fault locator to the power transmission system with line traps.
  • FIG 1 shows components of the line fault locator according to this invention.
  • the line fault locator comprises a plurality of pulse generators 1, 2, 3, an interface unit 6, an alarm unit 7, a display unit 8, and a processor unit 5 connected to the plurality of pulse generators 1, 2, 3, the interface unit 6, the alarm unit 7, and the display unit 8, respectively;
  • the line fault locator according to this invention is a radar type line fault locator for identifying line fault location on transmission lines without a line trap.
  • the line fault locator further comprises a GPS satellite receiver 4 connected to the processor unit 5.
  • the plurality of pulse generators 1, 2, 3 comprise a Phase A pulse generator 1, a Phase B pulse generator 2 and a Phase C pulse generator 3 connected to the processor unit 5.
  • the Phase A pulse generator 1, Phase B pulse generator 2, and Phase C pulse generator 3 generates the transmission line test signals with the frequency of 80 - 500 kHz, signal transmitting interval of 20 - 50 microseconds, signal voltage level of 0.6 - 1.2 kilovoltage, and output impedance of 300 - 600 ohms.
  • the output impedance is preferably 400 - 500 ohms.
  • the Phase A pulse generator 1 connects to a Phase A voltage transformer 10 connected to a Phase A transmission line 13
  • the phase B pulse generator 2 connects to a Phase B voltage transformer 11 connected to a Phase B transmission line 14
  • the Phase C pulse generator 3 connects to a Phase C voltage transformer 12 connected to a Phase C transmission line 15, respectively.
  • phase A pulse generator 1, phase B pulse generator 2, and phase C pulse generator 3 are The phase A pulse generator 1, phase B pulse generator 2, and phase C pulse generator 3:
  • the GPS satellite receiver 4 receives clock signals from GPS satellites and generates time stamps on detected fault events, so that the operators can simply analyze each fault event.
  • the interface unit 6 acts as an interface for direct connections with transferable data external to:
  • a parameter adjustment apparatus for each fault event in the power transmission system, which are different, most likely required new adjustment for discrepancy in parameter's setting (e.g., signal start time tolerances, signal frequency tolerances, signal voltage tolerances), etc.
  • the distance relay instructs to disconnect the device associated with the transmission line and also instructs the apparatus to transmit signal for inspection of fault's location, etc.
  • the processor unit 5 controls the operation of the line fault locator, processes data/signal data relating to output signals and reflected signals to determine distance and fault location and transmits data to display at the display unit 8 by receiving signals from the interface unit 6.
  • the alarm unit 7 transmits signals to a remote terminal unit (RTU) of a power substation via a signal cable 20 connected to the RTU when a fault is detected on a transmission line.
  • RTU remote terminal unit
  • Figure 2 shows a connection of one line fault locator according to this invention to the power transmission system.
  • the line fault locator connects to a power transmission system.
  • the line fault locator connects to a primary power substation 23 connected to a secondary power substation 24 via the Phase A transmission line 13, the Phase B transmission line 14, and the Phase C transmission line 15.
  • the Phase A voltage transformer 10, the Phase B voltage transformer 11, and the Phase C voltage transformer 12 connects to the Phase A transmission line 13, the Phase B transmission line 14, and the Phase C transmission line 15, respectively.
  • it indicates that the line fault locator according to this invention is operable with the power transmission system without a line trap, which can efficiently save costs.
  • Figure 3 shows a connection of two line fault locators according to this invention to the power transmission system.
  • the line fault locators connect to the power transmission system without a line trap.
  • One line fault locator is installed and connected to the transmission line at the primary power substation 23 while another one is installed and connected to the transmission line at the secondary power substation 24 allowing an effective detection of the fault location in blind zone
  • the line fault locator according to this invention can be installed and connected to the transmission line without a line trap. It can also be installed either at the primary power substation 23 or the secondary power substation 24 or both the primary power substation 23 and the secondary power substation 24.
  • the line fault locator at the primary power substation 23 will be activated to operate via a signal cable 19 of the distance relay connected to the protection system in a power substation.
  • the line fault locator transmits one test signal at a time to the Phase A transmission line 13, the Phase B transmission line 14, and the Phase C transmission line 15, then waits forthe signal reflected from each transmission line, and transmits to the processor unit 5 to process the distance at which the fault is occurred.
  • the line fault locator at the secondary power substation 24 is activated to perform in the same manner via the communication line 18.
  • the processor unit 5 sends the fault location result to show on the display unit 8 to the operator after finish processing.
  • the line fault locator according to this invention is a radar type for identifying line fault location on transmission lines without a line trap which yields high accuracy. Frequency wave is transmitted into the transmission line and reflected when fault is detected. This is used to calculate location as a distance from the fault location to the line fault locator, which is necessary to reduce system average of interruption duration caused by a fault in the power transmission system or SAIDI, and to increase reliability index of power transmission system. This indicates that the country's power transmission system is more stable and reliable.
  • This line fault locator is developed with improved features to provide several technical advantages, which are: ability to operate with the transmission lines without a line trap - this is because this invention is developed to generate an output impedance (Ol) at 300 - 600 ohms, preferably 400 - 500 ohms.
  • An output impedance of a typical line fault locator is at 75 ohms, which would require a matching impedance equipment to balance the impedance; applicability with all voltage level of the transmission lines, in conjunction with capacitor voltage transformers (CVT) which is used to transform voltages lower for operators' safety and suitable for a measurement range of the voltmeter.
  • CVT capacitor voltage transformers
  • a basic protection system in a power transmission line has specified a voltage standard where the CVT has a port for transmitting a signal to inspect line fault; ability to quickly detect signals; i.e., one signal transmission (one phase) takes 1 to 2 milliseconds, thus six signal transmissions (three phases) between both substations take just 18 milliseconds; ability to process line fault location on transmission lines quickly and precisely, i.e., process one fault event in just 18 milliseconds (three phases) whereas a typical line fault locator requires 320 milliseconds (1 phase) to do so; ability to receive remote operation commands, especially from autonomous control centers, while a typical line fault locator requires an operator to travel to inspect the line fault locator at the site; ability to easily determine cause of fault each time due to GPS system, which has a time tracking function and time analysis function to analyze event's data compared to the line fault event by means of time stamp principle using signals from GPS satellites; ability to display calculation result for distance and location of the fault, i.e., ability to transmit the test
  • Transmission Line used herein can refer to "High Voltage Transmission Line", “Medium Voltage Transmission Line” or “Low Voltage Transmission Line”.
  • Voltage Transformer also includes “Capacitor Voltage Transformer”.
  • Primary Power Substation denotes "Power Distribution Station” and the “Secondary Power Substation” denotes "Power Receiving Station”.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

L'invention concerne un localisateur de défaut de ligne comprenant une pluralité de générateurs d'impulsions, une unité d'interface, une unité d'alarme, une unité d'affichage et une unité de processeur raccordée respectivement à la pluralité de générateurs d'impulsions, à l'unité d'interface, à l'unité d'alarme et à l'unité d'affichage ; le localisateur de défaut de ligne étant un localisateur de type radar, destiné à identifier l'emplacement d'un défaut de ligne sur des lignes de transmission, sans piège à lignes ; le localisateur de défaut de ligne comprenant également un récepteur de satellite GPS raccordé au processeur ; et la pluralité de générateurs d'impulsions comprenant un générateur d'impulsions de Phase A, un générateur d'impulsions de Phase B et un générateur d'impulsions de Phase C ; lesdits générateurs d'impulsions de Phase A, B et C étant raccordés au processeur. Le localisateur de défaut de ligne selon l'invention permet d'économiser du temps dans la détermination de défauts, de réduire les coûts de fonctionnement, ainsi que l'impact d'une panne de courant sur les utilisateurs.
PCT/IB2021/054682 2020-06-05 2021-05-28 Localisateur de défaut de ligne WO2021245511A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TH2001003125 2020-06-05
TH2001003125 2020-06-05

Publications (1)

Publication Number Publication Date
WO2021245511A1 true WO2021245511A1 (fr) 2021-12-09

Family

ID=78830833

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2021/054682 WO2021245511A1 (fr) 2020-06-05 2021-05-28 Localisateur de défaut de ligne

Country Status (1)

Country Link
WO (1) WO2021245511A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114814464A (zh) * 2022-05-17 2022-07-29 云南电网有限责任公司临沧供电局 一种三相电路故障查找***及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140017733A (ko) * 2012-07-31 2014-02-12 이현창 지아이에스 매핑 정보를 이용한 불량 전력설비 검출 방법 및 시스템
US20150073735A1 (en) * 2013-09-11 2015-03-12 King Fahd University Of Petroleum And Minerals Method for adaptive fault location in power system networks
CN107677933A (zh) * 2017-11-21 2018-02-09 桂林师范高等专科学校 配电网故障检测装置
CN107748317A (zh) * 2017-11-29 2018-03-02 电子科技大学 一种地下电缆高阻故障的精确定位***
CN110244190A (zh) * 2019-07-18 2019-09-17 淄博威纳电气有限公司 一种电力线路故障在线监测与定位***

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140017733A (ko) * 2012-07-31 2014-02-12 이현창 지아이에스 매핑 정보를 이용한 불량 전력설비 검출 방법 및 시스템
US20150073735A1 (en) * 2013-09-11 2015-03-12 King Fahd University Of Petroleum And Minerals Method for adaptive fault location in power system networks
CN107677933A (zh) * 2017-11-21 2018-02-09 桂林师范高等专科学校 配电网故障检测装置
CN107748317A (zh) * 2017-11-29 2018-03-02 电子科技大学 一种地下电缆高阻故障的精确定位***
CN110244190A (zh) * 2019-07-18 2019-09-17 淄博威纳电气有限公司 一种电力线路故障在线监测与定位***

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114814464A (zh) * 2022-05-17 2022-07-29 云南电网有限责任公司临沧供电局 一种三相电路故障查找***及方法
WO2023221432A1 (fr) * 2022-05-17 2023-11-23 云南电网有限责任公司临沧供电局 Système et procédé de recherche de défaut pour circuit triphasé

Similar Documents

Publication Publication Date Title
US7400150B2 (en) Remote fault monitoring in power lines
CN102937675B (zh) 配电网实时数据采集和故障定位***的工作方法
KR101509088B1 (ko) 가공송배전선로 고장지점 검출시스템
US7154279B2 (en) Partial discharge detection test link, partial discharge detection system and methods for detecting partial discharge on a power cable
CN105051996A (zh) 用于保护电气网络的设备
US7355412B1 (en) Remote fault monitoring system
CN102129005B (zh) 变电站/发电厂二次回路直流接地指示器及其应用
CN103558511A (zh) 配电网在线式接地故障定位***
CN108490316A (zh) 智能配网接地线装置及智能配网接地线接地测量***
CN202735448U (zh) 多点接地监测装置
WO2021245511A1 (fr) Localisateur de défaut de ligne
CN102540009A (zh) 一种配电网故障定位***
JP4142608B2 (ja) 配電線の樹木接触監視装置
CN105158657A (zh) 高压开关柜局部放电在线监测***
CN101957421B (zh) 在线置零检测、监测高阻接地故障的方法及其测试装置
JP2001196980A (ja) 有線式配電線遠方監視制御用通信ケーブルの障害点探査・標定方法および装置
CN110987169A (zh) 一种gis母线振动情况监测装置及监测方法
KR20040032126A (ko) 가공송전선로의 낙뢰지점과 고장지점 검출시스템
CN117949781B (zh) 一种低压线路故障查找装置及方法
CN112285615A (zh) 可快速分辨故障位置的线缆检测装置
CN111624517A (zh) 一种便携式杆塔电气设备绝缘在线监测装置
CN212540586U (zh) 一种用于不接地***的绝缘故障定位***
Sharma et al. Application of ultra-high-speed protection and traveling-wave fault locating on a hybrid line
JP3657064B2 (ja) 高圧絶縁常時監視装置
CN206301020U (zh) 一种具备四遥功能的配电网运行状态监测装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21816896

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21816896

Country of ref document: EP

Kind code of ref document: A1