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公开(公告)号：EP3993204A1
公开(公告)日：2022-05-04
申请号：EP20204229.7
申请日：2020-10-28
摘要： A method for determining a location of a fault (16) on a powerline (11), comprising: obtaining, using a measuring device (15) at a measurement location on the powerline (11), time-dependent data of a voltage on the powerline (11) and of a current through the powerline (11) at the measurement location, wherein the time-dependent data is obtained during a time period after fault inception; removing fundamental frequency components from the time-dependent data; calculating, from the time-dependent data, a virtual fault inductance for at least two different potential fault locations, by inputting the time-dependent data into an equivalent circuit model, by means of time-domain calculations on the nonfundamental frequency waveform components; and deriving, from the virtual fault inductance for each of the potential fault locations, a location on the line at which the virtual fault inductance is substantially zero.
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12.发明公开
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13.发明公开
公开(公告)号：EP3797304A1
公开(公告)日：2021-03-31
申请号：EP19708957.6
申请日：2019-02-18
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14.发明公开
公开(公告)号：EP3775944A1
公开(公告)日：2021-02-17
申请号：EP19709377.6
申请日：2019-02-18
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15.发明公开
公开(公告)号：EP3496222A1
公开(公告)日：2019-06-12
申请号：EP18209668.5
申请日：2018-11-30
申请人： LSIS Co., Ltd.
发明人： YOON, Jaeshik , JUNG, Hyunyoung , YU, Jaeyoung
摘要： An earth leakage circuit breaker includes a current sensing unit configured to sense current in a circuit, a converter configured to detect a fundamental wave component and a specific harmonic component from the sensed current, the specific harmonic component being one of a plurality of harmonic components, and a controller.
The controller is configured to compare a harmonic component ratio with a threshold component ratio, to determine whether the sensed current is abnormal current, and to control cutoff of the circuit according to the result of determination. The harmonic component ratio is a ratio of the specific harmonic component to the fundamental wave component. The converter is configured to convert the sensed current from an analog signal into digital data and to perform Fourier transform with respect to the converted digital data to detect the fundamental wave component and the specific harmonic component.-
16.发明公开RELAY PROTECTION METHOD AND DEVICE AGAINST LC PARALLEL CIRCUIT DETUNING FAULTS 审中-公开RELAISSCHUTZVERFAHREN UND VORRICHTUNG GEGEN PARALLELE LC-SCHALTVERSTIMMMUNGSFEHLER
公开(公告)号：EP3139462A4
公开(公告)日：2017-07-19
申请号：EP15785909
申请日：2015-01-08
发明人： ZHANG QIXUE , XU BAOLI , ZHANG JIE , LI HUAZHONG , JI YAOYAO , ZHONG SHOUPING , WANG GUANG , CHEN JUN , YAN WEI
IPC分类号： H02H7/22 , H02H3/04 , H02H3/52 , H02H7/06 , H02H7/26 , H02J1/02 , H02J3/01 , H02J3/24 , H02J3/36
CPC分类号： H02H7/20 , H02H3/04 , H02H3/52 , H02H7/042 , H02H7/06 , H02H7/16 , H02H7/267 , H02H7/268 , H02J1/02 , H02J3/01 , H02J3/24 , H02J3/36 , H02J2003/365 , Y02E40/40 , Y02E60/60
摘要： A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip after a setting time delay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device. The relay protection method and device against LC parallel circuit detuning faults can improve stability of calculation results of a current ratio and raise sensitivity and rapidity of protection.
摘要翻译： 一种针对LC并联电路失谐故障的继电保护方法，包括以下步骤：继电保护装置对并联LC电流即电抗器和电容进行采样，并对流经整个LC的总电流进行采样; 将电抗器的电流转换为等效电容器的电流; 计算等效电容器的电流幅度和实际电容器的电流，并计算流过LC的总电流的幅度; 计算等效电容器与实际电容器的电流幅度比; 当流经LC的总电流幅值足够大时，如果电流比超过预设的上限和下限范围，则发出报警信号或经过设定时间延迟后跳闸。 还提供了相应的继电保护装置。 针对LC并联电路失谐故障的继电保护方法和装置，可以提高电流比计算结果的稳定性，提高保护灵敏度和快速性。
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公开(公告)号：EP1820034B1
公开(公告)日：2009-09-23
申请号：EP05803993.4
申请日：2005-11-18
申请人： Powersense A/S
CPC分类号： H04W4/14 , G01R1/00 , G01R15/246 , G01R19/2513 , G01R31/025 , G01R33/0322 , H04L67/12
摘要： The present invention relates to a monitoring system for detecting earth faults in an electrical power supply grid. The system may comprise a plurality of monitoring devices mounted in a number of monitoring locations, each of the monitoring devices may include a detector for detecting level of harmonics in the electrical power. The level of harmonics is preferably detected in a specific frequency range. The monitoring devices may further include a memory device for storing a harmonics reference value and may still further include a processor for comparing the level of harmonics with the reference level. The monitoring device may even still further include a communication device for transmitting an alarm provided the level of harmonics is above the reference level for a specific period of time.
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公开(公告)号：EP1820034A2
公开(公告)日：2007-08-22
申请号：EP05803993.4
申请日：2005-11-18
申请人： Nesa A/S
CPC分类号： H04W4/14 , G01R1/00 , G01R15/246 , G01R19/2513 , G01R31/025 , G01R33/0322 , H04L67/12
摘要： The present invention relates to a monitoring system for detecting earth faults in an electrical power supply grid. The system may comprise a plurality of monitoring devices mounted in a number of monitoring locations, each of the monitoring devices may include a detector for detecting level of harmonics in the electrical power. The level of harmonics is preferably detected in a specific frequency range. The monitoring devices may further include a memory device for storing a harmonics reference value and may still further include a processor for comparing the level of harmonics with the reference level. The monitoring device may even still further include a communication device for transmitting an alarm provided the level of harmonics is above the reference level for a specific period of time.
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19.发明公开
公开(公告)号：EP0795945A2
公开(公告)日：1997-09-17
申请号：EP97660018.9
申请日：1997-02-20
申请人： ABB Control OY
发明人： Kiiskinen, Esko
CPC分类号： H02H3/083 , H02H3/52 , H02H5/105 , Y10T307/297
摘要： The present invention relates to protection circuit and method for the EMI/RFI suppression system (2) of such a five-conductor electrical system in which the neutral conductor (N) is provided with a bandstoptype filter circuit (2) for the suppression of a harmonic interference current component. According to the invention, on the neutral conductor (N) is placed a current transformer (CT) having over its secondary a resistive branch (R 1 ), and in parallel therewith, a filter branch (5) comprising a bandpass filter (LC) tuned to the fundamental frequency of said neutral-conductor filter circuit (2) and said filter branch (5) having in series with said bandpass filter branch (LC) a switch element (4) suitable for short-circuiting said neutral-conductor filter circuit (2) when current in said filter branch (5) exceeds a preset upper limit level.
摘要翻译： 本发明涉及保护电路和方法，用于在EMI / RFI抑制系统（2）的求五导体电系统，其中，所述中性导体（N）设置有用于的抑制带阻型滤波器电路（2） 谐波干扰电流分量。 。根据本发明，在中性导体（N）与并联放置在具有在其二次电阻分支（R1）的电流互感器（CT），并且在那里，一个滤波器分支（5），其包括调谐的带通滤波器（LC） 到的基频所述中性导体滤波电路（2）和所述过滤器分支（5），其具有与所述带通滤波器分支（LC）的开关元件（4）适合于短路所述中性导体滤波器电路系列（ 2）当在当前所述滤波器分支（5）超过了预先设定的上限电平。
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公开(公告)号：EP0596879B1
公开(公告)日：1995-04-05
申请号：EP91913364.5
申请日：1991-08-01
发明人： SCHMIDT, Gerhard
CPC分类号： H02M7/7575 , G01R31/40 , H02H1/0015 , H02H7/1216 , Y02E60/60
摘要： In order to recognize in time discharge defects that could provoke a fire in power converters (2, 2a), in particular HVDC systems, a signal (S) obtained from the power converter (2, 2a) is subjected to a frequency analysis. When a defect-conditioned change in the freqency spectrum of the signal (S) is recognized, a defect indicating signal is generated. Non-characteristic harmonic fractions or interharmonic fractions of the frequency spectrum (FS) of the signal (S) are preferably examined. The frequency analysis may also be carried out by means of a fuzzy logic.
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