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公开(公告)号：US20220091173A1
公开(公告)日：2022-03-24
申请号：US17421442
申请日：2020-01-07
Applicant: ABB Power Grids Switzerland AG
Inventor： Jianping Wang , Zhanpeng Shi , Youyi Li
Abstract: There is provided mechanisms for differential protection of a transmission line (20) of a transmission system (25). A method comprises obtaining a restraining current and a differential current from the transmission line (S102). The method comprises determining a compensation current for the differential current (S104). The method comprises providing the differential current as compensated for by the compensation current and the restraining current to a differential protection arrangement for making a trip decision (S106). The method comprises detecting an internal fault for the transmission system (S108). The method comprises, as a result thereof, providing the differential current without being compensated for by the compensation current and the restraining current to the differential protection arrangement for making the trip decision (S110).
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公开(公告)号：US11050239B2
公开(公告)日：2021-06-29
申请号：US16418105
申请日：2019-05-21
Applicant: ABB Power Grids Switzerland AG
Inventor： Kai Liu , Jianping Wang , Youyi Li
Abstract: A method for detecting fault direction of a transmission line of an AC power system and a control system using the same. The method includes sampling current values and voltage values at one end of the transmission line for a series of time points; computing instantaneous voltage values at compensated point on the transmission line from the current value samples and the voltage value samples based on a time domain lumped parameter differential equation for the transmission line for the series of time points; recording the current value samples and the computed instantaneous voltage values at the compensated point; computing at least one voltage fault component each using the recorded computed instantaneous voltage values for at least the at least two of the series of time points; identifying the fault direction in consideration of the at least one computed voltage fault component and the at least one computed current fault component; and generating a fault direction signal indicating the identified fault direction. Where a fault directional element is designed using the voltage fault components at the compensated point, it will work well for the AC power system with strong power source.
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公开(公告)号：US11022655B2
公开(公告)日：2021-06-01
申请号：US16174701
申请日：2018-10-30
Applicant: ABB Power Grids Switzerland AG
Inventor： Kai Liu , Jianping Wang , Youyi Li
Abstract: A method, control system and protective relay are provided for detecting faulted phases of transmission lines in an AC power system. The method includes sampling electric signals at one end of the transmission lines at a series of time points; computing instantaneous voltage values of electric signals at compensated points on the transmission lines from the values of the sampled electric signals based on a time domain lumped parameter differential equation for the transmission lines for the series of time points; recording the computed instantaneous voltage values of the electric signals; computing fault component or sudden-change of the instantaneous voltage values of the electrical signals; detecting the faulted phases or fault types by comparing the calculated fault component of the instantaneous voltage values at the preset compensated points; and generating signals indicating the faulted phases of fault types.
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Patent Agency Ranking
公开(公告)号：US10734803B2
公开(公告)日：2020-08-04
申请号：US15574390
申请日：2015-05-26
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Kai Liu , Jianping Wang
Abstract: There is provided mechanisms for travelling wave protection of a transmission line. A method includes performing high-pass filtering of a current and/or voltage measurement of a transmission line so as to detect fault-caused high-frequency components of the current and/or voltage measurement. The method includes providing a result of the high-pass filtering as input to a trip decision maker performing travelling wave detection.
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公开(公告)号：US11112445B2
公开(公告)日：2021-09-07
申请号：US15570493
申请日：2015-05-28
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Jianping Wang , Kai Liu
IPC: G01R31/08 , G01R31/327 , H02H7/26
Abstract: A mechanism for travelling wave pilot protection of a transmission line and method for receiving indications of a travelling wave from two terminals of a transmission line, wherein two terminals are time synchronized. The method includes making a trip decision based on the indications using a short trip window. An arrangement is configured to perform the disclosed method.
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公开(公告)号：US11047892B2
公开(公告)日：2021-06-29
申请号：US16315665
申请日：2016-07-08
Applicant: ABB Power Grids Switzerland AG
Inventor： Naidu Obbalareddi Demudu , Amit Purohit , Sachin Srivastava , Jianping Wang
Abstract: A method and system is provided for locating a fault in a mixed power transmission line. The method is implemented by an Intelligent Electronic Device (IED) of the mixed line. The IED detects a travelling wave from one or more signals received from one or more measurement equipment. Thereafter, the IED identifies a line section with the fault, and generates two or more estimates for the location of the fault based on a time difference between arrival of two peaks of the travelling wave, a velocity of propagation of the travelling wave in the line section identified with the fault, and a length of one or more line sections. The IED determines the location of the fault based on a comparison of each estimate with a threshold, wherein the threshold is estimated based on the one or more signals, equivalent source impedance of each source and total line impedance.
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公开(公告)号：US20200335967A1
公开(公告)日：2020-10-22
申请号：US16956348
申请日：2017-12-20
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Kai Liu , Jianping Wang
Abstract: There is provided mechanisms for zero sequence differential protection of a transmission line of a power system. An arrangement comprises a zero sequence differential protection unit configured for, using current measurements of each phase A, B, C of the transmission line, internal fault detection of the transmission line. The arrangement comprises a phase selection unit configured for, using a comparison of differential values of the current measures for each phase, determination of whether any of the phases A, B, C of the transmission line is faulty or not. A trip is caused by the zero sequence differential protection unit when an internal fault is detected by the zero sequence differential protection unit, and the trip starts all the phases A, B, C for the phase selection unit to finalize the trip for said any faulty phase.
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8.发明申请公开(公告)号：US20200319262A1
公开(公告)日：2020-10-08
申请号：US16832864
申请日：2020-03-27
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Jianping Wang , Aken-Kai Liu
Abstract: A method can be used for fault detection of a transmission. The method includes obtaining instantaneous measurements of local voltages and local currents of the transmission line, obtaining filtered measurements of the local voltages and local currents by subjecting the measurements of the local voltages and local currents to low pass filtering, obtaining a compensated voltage calculated by subjecting the filtered measurements to a differential equation based algorithm, and performing fault detection by forming a ratio between the compensated voltage and the a reference voltage. An internal fault is determined when the ratio is below a threshold and an external fault is determined when ratio is larger than above the threshold.
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