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公开(公告)号：US20210399545A1
公开(公告)日：2021-12-23
申请号：US17288640
申请日：2019-10-22
发明人： Obbalareddi Demudu Naidu , Preetham Venkat Yalla , Vedanta Pradhan , Nandkishor Kubal , Sachin Srivastava
摘要： The invention relates to protection from faults in a power transmission system having two or more transmission lines. Travelling waves are detected from a signal obtained with a measurement equipment associated with a bus of the power transmission system. Arrival times of a first peak of a first travelling wave, a second travelling wave and a third travelling wave, are detected from the signal. A value for line length is calculated from the arrival times and propagation velocity of the travelling wave in the corresponding transmission line. The calculated value is compared with an actual length of the corresponding transmission line, for determining if the fault is an internal fault or an external fault. According to the fault being one of the internal fault and the external fault, a signal for controlling a switching device associated with the corresponding transmission line is generated.
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2.发明授权公开(公告)号：US11061062B2
公开(公告)日：2021-07-13
申请号：US16474054
申请日：2017-04-20
IPC分类号： G01R31/08
摘要： The invention provides an Intelligent Electronic Device (IED) and a method for locating a fault in a power transmission line with the IED. The method comprises measuring arrival times of a first, second and third peak of a travelling wave, using measurements obtained with one or more measurement equipment connected with the power transmission line. The method further comprises generating two or more initial estimates for the location of the fault, estimating time of initiation of the travelling wave, and estimating an arrival time of the third peak. The estimated arrival time of the third peak is compared with the measured arrival time of the third peak, to select an initial estimate of the two or more initial estimates as the location of the fault.
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公开(公告)号：US20210063463A1
公开(公告)日：2021-03-04
申请号：US16958076
申请日：2018-06-14
摘要： A device can be used with a power transmission system that includes three section that are connected at a junction, each section being from a corresponding. An input interface receives measurements of voltages and currents carried out at one or more of the first terminal, the second terminal and the third terminal or positive sequence voltage and current phasors obtained from the measurements of voltages and currents carried out at one or more of the first terminal, the second terminal and the third terminal. A phasor calculation module calculates positive sequence voltage and current phasors from the measurements of voltages and currents carried out at a terminal of the power transmission system. A fault locator obtains the fault location based on the section with the fault, the positive sequence voltage and current phasors obtained for each terminal, and the positive sequence line impedance parameters of each section.
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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
摘要： 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：US11035897B2
公开(公告)日：2021-06-15
申请号：US16636544
申请日：2017-09-26
摘要： The invention provides a method and device for fault section identification in a multi-terminal mixed line. The method comprises obtaining positive sequence voltage and current phasors from measurements of voltages and currents at each terminal of the mixed line. The method further comprises calculating a voltage phasor for each terminal, wherein the calculation of the voltage phasor for a first terminal is performed using at least the voltage and current phasors obtained for one of a second terminal and a third terminal, and the current phasor obtained for the first terminal. Thereafter, the method comprises determining a section of the mixed line having the fault, based on comparison of the calculated and obtained voltage phasors for each terminal. In addition, the method comprises controlling a switching device with a re-trip signal generated based on the determination of the section with the fault.
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