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Phase selection for multi-terminal measurements using transmission lines

A transmission line, phase selection technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve the effect of easy implementation

Active Publication Date: 2021-07-30
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the embodiments herein is to provide an efficient mechanism for phase selection during fault determination for a transmission line

Method used

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  • Phase selection for multi-terminal measurements using transmission lines
  • Phase selection for multi-terminal measurements using transmission lines
  • Phase selection for multi-terminal measurements using transmission lines

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Embodiment Construction

[0031]The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Throughout this specification, like numbers refer to like elements.

[0032] Embodiments disclosed herein relate to mechanisms for phase selection using multi-terminal measurements of a transmission line 110 of a power system 100 . In order to obtain this mechanism, a phase selection unit 200, a method implemented by the phase selection unit 200, a computer program product comprising code, for example in the form of a computer program, which runs on the phase selection unit 200 a...

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Abstract

Mechanisms are provided for phase selection using multi-terminal measurements of transmission lines of a power system. The method comprises obtaining the delta differential between the pre-fault differential current measurement and the post-fault differential current measurement at time t from all phases A, B, C of the transmission line using measurements from at least two terminals of the transmission line. Current value ΔI diffA (t), ΔI diffB (t), ΔI diffC (t). The method includes all absolute values ​​where the absolute value of the corresponding Δ differential current value is greater than Δ differential current value|ΔI diffA (t)|, |ΔI diffB (t)|, |ΔI diffC Phase A, B, or C is determined to be faulty when the minimum value in (t)| is multiplied by k, where k>1 is a scaling factor.

Description

technical field [0001] Embodiments presented herein relate to mechanisms for phase selection using multi-terminal measurements of transmission lines of a power system. Background technique [0002] Transmission lines are a vital part of an electrical distribution system because they provide the path through which power is transferred between generators and loads. For reliable operation, transmission lines are ideally closely interconnected. Factors such as deregulated market conditions, economics, right-of-way permits, and environmental requirements have prompted utilities to operate transmission lines near their operating limits. Any fault, if not detected and quickly isolated, will cascade into a system-wide disturbance, which can de-energize large areas of tightly interconnected systems operating near their limits. Transmission protection systems are designed to identify the location of the fault and isolate only the faulty part. A key challenge for transmission line p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/34H02H3/44G01R31/08
CPCG01R31/08H02H3/042H02H3/305G01R31/085G01R31/088H02H1/0007H02H7/26
Inventor 李幼仪刘凯王建平
Owner HITACHI ENERGY SWITZERLAND AG