[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

HRP20210115T1 - Sustav i postupak lociranja zemljospoja u električnim mrežama - Google Patents

Sustav i postupak lociranja zemljospoja u električnim mrežama Download PDF

Info

Publication number
HRP20210115T1
HRP20210115T1 HRP20210115TT HRP20210115T HRP20210115T1 HR P20210115 T1 HRP20210115 T1 HR P20210115T1 HR P20210115T T HRP20210115T T HR P20210115TT HR P20210115 T HRP20210115 T HR P20210115T HR P20210115 T1 HRP20210115 T1 HR P20210115T1
Authority
HR
Croatia
Prior art keywords
voltage
zero
source
fault
electrical network
Prior art date
Application number
HRP20210115TT
Other languages
English (en)
Inventor
Klaus Winter
Andreas Winter
Original Assignee
Swedish Neutral Ab
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 Swedish Neutral Ab filed Critical Swedish Neutral Ab
Publication of HRP20210115T1 publication Critical patent/HRP20210115T1/hr

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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • 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
    • 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
    • G01R31/081—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/003—Fault detection by injection of an auxiliary voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Locating Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Claims (8)

1. Sustav za lociranje zemljospoja u višefaznoj električnoj mreži koju napaja izvor (310) električne energije, taj sustav obuhvaća: izvor (380) izmjeničnog napona sinhroniziran s električnom mrežom i koji je priključen između nulte točke (N) električne mreže i uzemljenja (E), i upravljačku jedinicu (370) konfiguriranu za upravljanje izvorom (380) izmjeničnog napona u režimu kompenzacije struje kvara da bi se kompenzirala bilo kakva struja kvara na uzemljenju u mreži električnog napajanja do vrijednosti ispod razine praga, Sustav sadrži barem jedan detektor (351, 352, 35N, 361, 362, 36N) raspoređen u električnoj mreži i komunikacijski priključen na upravljačku jedinicu (370), čiji je barem jedan detektor (351, 352, 35N, 361, 362, 36N) konfiguriran je za registriranje mjerne vrijednosti koje predstavljaju struju nulte sekvence i t adultaciju nulte sekvence, upravljačka jedinica (370), u slučaju otkrivanja kvara, je konfigurirana za postupno podešavanje napon od izvora (310) izmjeničnog napona u odnosu na kut amplitude i/ili faze tako da je promjenu struje nulte sekvence i adultacije nulte sekvence između izvora (370) izmjeničnog napona i točke lokalizacije moguće izmjeriti barem jednim detektorom (351, 352, 35N, 361, 362, 36N), barem jedan detektor (351, 352, 35N, 361, 362, 36N) je konfiguriran za primjenu registrirane izmjerene vrijednosti koje predstavljaju struju nulte sekvence i/ili adultaciju nulte sekvence, na upravljačkoj jedinici (370), i upravljačka jedinica (370), u režimu detektiranja kvara je konfigurirana da otkrije kvar na uzemljenju temeljem najmanje jedne od spomenutih vrijednosti mjerenja koje predstavljaju promjene struje nulte sekvence i/ili adultacije nulte sekvence, pri čemu je upravljačka jedinica 370 naznačena time što je konfigurirana za promjenu sklopke u režim kompenzacije kvara nakon režima otkrivanja kvara.
2. Sustav sukladno patentnom zahtjevu 1, pri čemu je upravljačka jedinica (370) u režimu otkrivanja kvara konfigurirana upravljati izvorom (380) izmjeničnog napona u svrhu isporuke izmjeničnog napona u električnu mrežu, čiji se izmjenični napon superponira na napon električne mreže, i postupno je mijenja i čija se frekvencija razlikuje od frekvencije električne mreže.
3. Sustav sukladno bilo kojem od prethodnih patentnih zahtjeva, pri čemu je upravljačka jedinica (370) konfigurirana upravljati izvorom (380) izmjeničnog napona u svrhu isporuke izmjeničnog napona s obrascem superponiranog signala, i najmanje jedan detektor (351, 352, 35N, 361, 362, 36N) je konfiguriran da bi se otkrio obrazac superponiranog signala.
4. Postupak lociranja zemljospoja u višefaznoj električnoj mreži koja se napaja uz pomoć izvora (310) električnog napajanja uporabom izvora (380) izmjeničnog napona sinkroniziranog na električnu mrežu, koja je spojena između nulte točke (N) te električne mreže i uzemljenja (E), taj postupak uključuje: upravljanje, u režimu kompenzacije struje kvara, uz pomoć izvora (380) izmjeničnog napona da kompenzira bilo koju struju kvara uzemljenja u električnoj rmeži do vrijednosti ispod razine praga, naznačeno time što taj postupak nadalje obuhvaća: registriranje vrijednosti mjerenja koje predstavljaju struju nulte sekvence i adultaciju nulte sekvence uporabom najmanje jednog detektora (351, 352, 35N, 361, 362, 36N) postavljenog u električnoj mreži, i u režimu otkrivanja kvara: postupno podešavanje izlaznog napona od tog izvora (370) izmjeničnog napona u odnosu na kut amplitude i/ili kut faze tako da je izmkenu struje nulte sekvence i adultacije nulte sekvence između izvora (370) izmjeničnog napona i lokacije kvara moguće izmjeriti s najmanje jednim detektorom (351, 352, 35N, 361, 362, 36N), i lokaliziranje zemljospoja temeljem najmanje jedne od navedenih vrijednosti mjerenja koje predstavlja promjene struje nulte sekvence i/ili adultacije nulte sekvence, pri čemu taj postupak obuhvaća promjenu sklopke na režim kompenzacije kvara nakon režima otkrivanja kvara.
5. Postupak sukladno patentnom zahtjevu 4, pri čemu se kada se u režimu detektovanja kvara izvor (380) izmjeničnog napona kontroliše u svrhu isporuke izmjeničnog napona u električnu mrežu, koji je nadređen u odnosu na napon električne mreže, i postepeno se mijenja i čija se frekvencija razlikuje od frekvencije električne mreže.
6. Postupak sukladno bilo kojem od prethodnih patentnih zahtjeva 4 i 5, obuhvaća: upravljanje izvorom (380) izmjeničnog napona u svrhu isporuke izmjeničnog napona u električnu mrežu s obrascem superponiranog signala, i otkrivanje obrasca superponiranog signala uz pomoć najmanje jednog detektora (351, 352, 35N, 361, 362, 36N).
7. Računalni program koji se može učitati u memoriju (375) najmanje jednog procesora sukladno bilo kojem od prethodnih patentnih zahtjeva 4 i 6, pri čemu taj program radi u najmanje jednom procesoru.
8. Medij (375) čitljiv pomoću procesora koji ima u sebi pohranjen program, pri čemu je program postavljen da prouzroči da najmanje jedan procesor izvrši postupak sukladno bilo kojem od prethodnih patentnih zahtjeva 4 do 6 kada je program učitan u najmanje jedan procesor.
HRP20210115TT 2016-05-20 2017-05-16 Sustav i postupak lociranja zemljospoja u električnim mrežama HRP20210115T1 (hr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1650686A SE539485C2 (sv) 2016-05-20 2016-05-20 System och metod för lokalisering av jordfel i kraftnät
EP17725796.1A EP3459150B1 (en) 2016-05-20 2017-05-16 System and method for locating earth fault in power grids
PCT/SE2017/050506 WO2017200469A1 (en) 2016-05-20 2017-05-16 System and method for locating earth fault in power grids

Publications (1)

Publication Number Publication Date
HRP20210115T1 true HRP20210115T1 (hr) 2021-03-05

Family

ID=58772624

Family Applications (1)

Application Number Title Priority Date Filing Date
HRP20210115TT HRP20210115T1 (hr) 2016-05-20 2017-05-16 Sustav i postupak lociranja zemljospoja u električnim mrežama

Country Status (10)

Country Link
US (1) US11035907B2 (hr)
EP (1) EP3459150B1 (hr)
CN (1) CN109155518B (hr)
AU (1) AU2017265250B2 (hr)
ES (1) ES2844998T3 (hr)
HR (1) HRP20210115T1 (hr)
PT (1) PT3459150T (hr)
RU (1) RU2737863C2 (hr)
SE (1) SE539485C2 (hr)
WO (1) WO2017200469A1 (hr)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110297159B (zh) * 2018-03-21 2021-06-18 西门子电力自动化有限公司 用于确定电力系统补偿网络中的故障线路的方法与装置
CN109301799B (zh) * 2018-10-12 2022-07-01 中国电力科学研究院有限公司 一种防止同塔多回线纵联零序方向保护误动的方法和系统
CN109507521B (zh) * 2019-01-18 2020-10-09 云南电网有限责任公司电力科学研究院 可控电压源接地电流全补偿输出值的获取方法及装置
CN109742747B (zh) * 2019-01-30 2020-08-04 云南电网有限责任公司电力科学研究院 一种接地电流补偿方法以及接地电流补偿装置
CN109521320A (zh) * 2019-01-30 2019-03-26 云南电网有限责任公司电力科学研究院 一种可控电压源全补偿相位扰动选线方法
CN109782115B (zh) * 2019-03-29 2020-03-10 云南电网有限责任公司电力科学研究院 一种可控电压源全补偿接地故障消失的判别方法
CN110247401B (zh) * 2019-04-30 2023-04-14 云南电网有限责任公司电力科学研究院 一种可控电压源的电压补偿方法及装置
CN112039031B (zh) * 2019-06-03 2022-04-26 李景禄 一种配电网单相接地故障差异化处理与故障区域隔离方法
CN110907750B (zh) * 2019-11-21 2022-06-17 国电南瑞南京控制系统有限公司 基于中电阻法的配电主站单相接地故障定位方法及系统
DE102020002618A1 (de) 2020-04-30 2021-11-04 A. Eberle Gmbh & Co. Kg Verfahren zur Erkennung und/oder Ortung von Erdschlüssen
CN111537837A (zh) * 2020-06-05 2020-08-14 国网山东省电力公司电力科学研究院 一种配电网小电流接地故障定位方法及系统
CN111830366A (zh) * 2020-06-20 2020-10-27 青岛鼎信通讯股份有限公司 一种基于新暂态特征值的电网故障定位方法
CN113937737B (zh) * 2020-07-13 2024-09-27 长沙理工大学 一种发电机定子与厂用电系统接地故障处理方法
CN112769115B (zh) * 2020-11-28 2022-04-08 国网河南省电力公司电力科学研究院 一种接地残流自适应有源全补偿控制方法
CN112383030B (zh) * 2020-11-30 2023-01-17 云南电网有限责任公司电力科学研究院 一种新型开关柜弧光保护方法及装置
CN112731053B (zh) * 2020-12-18 2022-05-24 华南理工大学 一种谐振接地配电网的高阻接地故障区段定位方法
CN112731052A (zh) * 2020-12-18 2021-04-30 华南理工大学 一种基于零序特征量的配电网接地故障区段定位方法
CN112881858B (zh) * 2021-01-12 2022-08-05 福州大学 一种参数不对称配电网单相接地故障选相方法
CN113109663B (zh) * 2021-03-05 2024-07-30 国网江苏省电力有限公司徐州供电分公司 一种配电网故障检测定位方法
US11422201B1 (en) * 2021-03-18 2022-08-23 Nxp Usa, Inc. Devices and methods for voltage supply monitoring
CN112881945B (zh) * 2021-04-21 2022-10-14 深圳市市政设计研究院有限公司 一种判断接地故障的方法及装置
CN113189446B (zh) * 2021-04-28 2022-09-06 国网山东省电力公司泰安供电公司 一种小电流接地故障选线方法
CN113484659B (zh) * 2021-05-26 2022-07-29 贵州电网有限责任公司 一种基于相电压变化信息的10kV配电线路单相断线故障方向检测方法及装置
CN113484665B (zh) * 2021-06-09 2023-03-14 广西电网有限责任公司河池供电局 一种单相接地故障中的故障点定位方法
CN114200249B (zh) * 2021-12-15 2025-05-16 南方电网科学研究院有限责任公司 一种基于非接触式测量的配网故障定位方法及系统
CN114779007B (zh) * 2022-04-20 2024-05-31 中国矿业大学 基于接地线电流和零序电流的配电电缆故障区段定位方法
CN115459230B (zh) * 2022-10-11 2025-06-13 西安热工研究院有限公司 一种新能源场站单相接地故障判断保护系统及方法
EP4390411A1 (en) 2022-12-22 2024-06-26 Winter Brothers AB System and method for locating remote earth fault section in power grids
CN115840110B (zh) * 2023-02-13 2023-05-02 国网湖北省电力有限公司武汉供电公司 一种单相接地故障灵敏感知方法、系统及存储介质
CN116359674B (zh) * 2023-06-01 2023-09-12 昆明理工大学 一种基于故障暂态信号的有源配电网故障定位方法及系统
CN118226327B (zh) * 2024-05-24 2024-07-26 山东济矿鲁能煤电股份有限公司阳城煤矿 井下变电所远程远点漏电监测方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024014A2 (en) * 1994-02-28 1995-09-08 Abb Power T & D Company Inc. One-terminal data fault location system
US6573726B1 (en) * 2000-05-02 2003-06-03 Schweitzer Engineering Laboratories, Inc. Sensitive ground fault detection system for use in compensated electric power distribution networks
AT411937B (de) * 2000-08-11 2004-07-26 Adaptive Regelsysteme Ges M B Verfahren und vorrichtung zur erkennung und ortung von hochohmigen einpoligen erdfehlern
SE525185C2 (sv) * 2002-06-20 2004-12-21 Abb Ab Fellokalisering med hjälp av mätningar av ström och spänning från ena änden av en ledning
US7180300B2 (en) * 2004-12-10 2007-02-20 General Electric Company System and method of locating ground fault in electrical power distribution system
US8169756B2 (en) * 2006-03-29 2012-05-01 Rolls-Royce Plc Fault current limiting
EP1992954B1 (en) * 2007-05-18 2017-12-13 ABB Schweiz AG Method for determining location of phase-to-earth fault
RU2480777C2 (ru) * 2008-07-18 2013-04-27 Абб Текнолоджи Аг Способ и устройство для определения местоположения повреждений линии передачи с продольной компенсацией
EP2192416B1 (en) * 2008-11-26 2018-01-03 ABB Schweiz AG Method and apparatus for detecting a phase-to-earth fault
US8300369B2 (en) * 2009-09-30 2012-10-30 Chevron U.S.A. Inc. System and method for polyphase ground-fault circuit-interrupters
RU2505825C2 (ru) * 2012-02-17 2014-01-27 Общество с ограниченной ответственностью "Исследовательский центр "Бреслер" Способ определения мест двойного замыкания многопроводной электрической сети
SE537081C2 (sv) 2012-08-03 2014-12-30 Swedish Neutral Ab En anordning innefattande en reglerbar jordningstransformator
PL2994765T3 (pl) 2013-06-05 2019-07-31 Siemens Aktiengesellschaft Wykrywanie usterek uziemienia w sieciach elektroenergetycznych ze skompensowanym punktem neutralnym
US20150346266A1 (en) * 2014-05-30 2015-12-03 Eaton Corporation System and method for pulsed ground fault detection and localization
CN104155582B (zh) * 2014-08-29 2016-10-19 上海交通大学 基于全波形信息的配网线路故障区段定位方法
CN105137285A (zh) * 2015-08-28 2015-12-09 广东中钰科技股份有限公司 配电网接地故障选线方法和系统

Also Published As

Publication number Publication date
PT3459150T (pt) 2021-01-19
ES2844998T3 (es) 2021-07-23
US11035907B2 (en) 2021-06-15
SE1650686A1 (sv) 2017-10-03
AU2017265250A1 (en) 2018-11-29
CN109155518A (zh) 2019-01-04
AU2017265250B2 (en) 2021-07-08
US20190137559A1 (en) 2019-05-09
WO2017200469A1 (en) 2017-11-23
EP3459150A1 (en) 2019-03-27
BR112018073639A2 (pt) 2019-02-26
EP3459150B1 (en) 2020-11-18
RU2018145025A3 (hr) 2020-06-30
CN109155518B (zh) 2019-09-20
SE539485C2 (sv) 2017-10-03
RU2018145025A (ru) 2020-06-22
RU2737863C2 (ru) 2020-12-04

Similar Documents

Publication Publication Date Title
HRP20210115T1 (hr) Sustav i postupak lociranja zemljospoja u električnim mrežama
US10454362B2 (en) Circuit for pre-charging an intermediate circuit, and electric system
MX2016013871A (es) Detector de falla a tierra.
US6954071B2 (en) Pipeline mapping and interrupter therefor
RU2016141795A (ru) Способ автоматической компенсации тока однофазного замыкания на землю в сети с дугогасящим реактором в нейтрали
WO2018094350A3 (en) Current shunt monitor
JP2014517667A5 (hr)
BR112014027530A2 (pt) acionamento de motor ca, método para detectar uma falha de terra em um acionamento de motor ca e sistema para detectar uma falha de terra em um acionamento de motor ca
RU2014103243A (ru) Система и способ обнаружения повреждений и система электропитания кабелей для непосредственного электрического нагрева подводных трубопроводов
RU2011125624A (ru) Способ и устройство для определения замыкания фазы на землю
RU2020112992A (ru) Ситуативный контроль напряжения суперконденсатора
RU2013154085A (ru) Направленное обнаружение замыкания в сети, в частности, в системе с заземленной скомпенсированной или изолированной нейтралью
US10598718B2 (en) Method and device for insulation fault location having an adaptive test current determination
JP2016525864A5 (hr)
UA100997C2 (ru) Способ и устройство выявления дефекта в обратной нейтральной линии электрической сети
RU2012120702A (ru) Построение изображений удельного микросопротивления в проводящем и непроводящем буровом растворе
RU2015102599A (ru) Способ и узел датчика положения для определения взаимного положения между первым объектом и вторым объектом
GB2493450B (en) A controller for a voltage converter
GB2565513A (en) Temperature sensing induction heating tool
CN202975173U (zh) 一种变电站配电系统中的对地电容测量仪
MX2013000921A (es) Metodo y sistema para medicion de corriente en un contador electrico.
CN106872739A (zh) 电表、控制电表的切断元件的断开和/或闭合的方法
ITTO20130177A1 (it) Circuito di pilotaggio e dispositivo generatore provvisto di circuito di pilotaggio
RU2557375C1 (ru) Способ определения расстояния до мест замыканий на землю на двух линиях электропередачи в сетях с малыми токами замыкания на землю
HK1245396A1 (zh) 用於測量離子濃度的方法和設備