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Showing 1-25 of 63,734 resultsfor "Index Terms":Line Parameters
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In this guide, the field testing methodology and techniques are presented for measuring electrical parameters of AC transmission lines. The topics will include safety precautions; requirements for measuring instruments; measurement of induced voltage and current; phase verification and insulation resistance measurement; DC resistance measurement; off-line parameter measurement of symmetrical trans...Show More
Some algorithms for transmission line parameter estimation
2009 41st Southeastern Symposium on System Theory
Year: 2009 | Conference Paper |
Cited by: Papers (14)
Transmission line parameters are inputs to various power system analysis algorithms and precision of these parameters are thus important in ensuring the analysis accuracy. This paper proposes methods for estimating positive-sequence line parameters of series compensated lines. Voltages and currents from two ends of the line are utilized. In addition, algorithms for estimating parameters of non-com...Show More
In this guide, field testing methodology and techniques are presented for measuring DC transmission line and earth electrode line parameters. The topics to be addressed will include basic requirements of the measurement; safety cautions; requirements for test instruments; testing induced voltage and current; verifying the polarity and testing insulation resistance; measuring DC resistance; measuri...Show More
Study on online calculation method of transmission line parameters
11th IET International Conference on Developments in Power Systems Protection (DPSP 2012)
Year: 2012 | Conference Paper |
Cited by: Papers (3)
Transmission line parameter is important for obtaining power network structure, generating power system node admittance matrix or impedance matrix to calculate power flow, calculating short-circuit current, and setting relaying protection devices. But actually, transmission line parameters applied in power system are mostly experience values or offline measuring values provided by manufacturers, t...Show More
Online Optimal Transmission Line Parameter Estimation for Relaying Applications
Transmission line protective relaying algorithms usually require transmission line parameters as inputs and thus accuracy of line parameters plays a pivotal role in ensuring the reliable performance of relaying algorithms. Online estimation of line parameters is highly desirable and various methods have been proposed in the past. These methods perform well when the measurements utilized are accura...Show More
Double circuit transmission line parameter estimation using PMU
2016 IEEE 6th International Conference on Power Systems (ICPS)
Year: 2016 | Conference Paper |
Cited by: Papers (11)
Accurate measurement of transmission line parameters is important for power system protection applications, especially distance relays whose zone settings are based on positive sequence line impedance. This paper presents a new method to estimate all the parameters for double circuit transmission lines. Double circuit transmission lines are widely used in the power system and are important from re...Show More
New Approach for Precisely Measuring the Zero-Sequence Parameters of Long-Distance Double-Circuit Transmission Lines
Based on transmission-line equations and the distributed parameter model, a new approach is proposed to accurately measure the zero-sequence parameters of long-distance double-circuit transmission lines using voltages and currents measured at the ends of lines. The mathematical model of the proposed method is explained in detail, and the differential equations of two coupled lines with different s...Show More
Alternative Way To Derive Equivalent PI Circuit Model of Transmission Lines
2007 Thirty-Ninth Southeastern Symposium on System Theory
Year: 2007 | Conference Paper |
Cited by: Papers (2)
The equivalent pi circuit of a transmission line based on distributed parameter line model has traditionally been derived based on differential equations governing the relationship between voltage and current along the line. This paper presents an alternative method for deducing the model by dividing the long line into an infinite number of segments and modeling each segment using nominal pi circu...Show More
Short Transmission Line Parameter Estimation Using Firefly Algorithm
2021 International Conference on Emerging Power Technologies (ICEPT)
Year: 2021 | Conference Paper |
Cited by: Papers (9)
The transmission line is a vital part of an electric power network. Precise knowledge about the parameters of a transmission line is important to perform power system operation, control and, to design a line protection system. This paper puts forward a method to estimate parameters of a transmission line based on a short transmission line model and the line input-output data such as voltage, curre...Show More
Terminal response of non-uniform transmission line based on microwave network parameters
2021 2nd International Conference on Electronics, Communications and Information Technology (CECIT)
Year: 2021 | Conference Paper |
In order to study the terminal response characteristics of non-uniform line on a lossy ground exposed in radiation field, the formula of terminal response of abruptly non-uniform line above a lossy ground was derived based on transmission line model and microwave network transition matrix. The terminal response of the abruptly non-uniform line can be calculated accurately based on the derived form...Show More
Introduction of Reflection and Transmission Coefficients for Nonuniform Radiating Transmission Lines
In the framework of a high-frequency transmission-line theory for nonuniform lines (TLST), new reflection and transmission coefficients are derived using generalized definitions of equivalent quantities from the classical transmission-line theory. This leads to local and frequency-dependent reflection and transmission coefficients expressed in terms of matrizant elements. These quantities are need...Show More
Scattering Parameters Characterization of Periodically Nonuniform Transmission Lines With a Perturbative Technique
Xiaokang Liu;Xinglong Wu;Flavia Grassi;Giordano Spadacini;Dries Vande Ginste;Sergio A. Pignari
In this article, a novel procedure for the frequency-domain solution of nonuniform transmission lines (NUTLs) is presented. The procedure is based on a recently proposed perturbative technique, which is proven to be computationally more efficient than standard solution approaches, which are based on line subdivision into uniform cascaded sections. With respect to the original perturbation techniqu...Show More
Parameter Estimation of Short Transmission Line Using Rao-I Algorithm
Abdullah Shoukat;Muhammad Ali Mughal;Sadiq Ahmad;Saifullah Younus Gondal;Saad Salman Khan
2021 6th International Multi-Topic ICT Conference (IMTIC)
Year: 2021 | Conference Paper |
Cited by: Papers (6)
In an electrical power system, the transmission line has great importance and act as the key component to transmit power from generation end to distribution end. Accurate knowledge about the transmission line parameters is required to implement the important actions related to operation, control and the design of protection schemes for the power transmission lines. In this research work a techniqu...Show More
Modeling Approach for Short-Transmission Lines on the same Tower with Different Wire Parameters and Tower Structure
2018 International Conference on Power System Technology (POWERCON)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
The transmission corridor is scarcity in many areas. Therefore, tower with multi-circuit transmission lines has a high proportion in the power grid. Moreover, it is common that there are short and ultrashort line, diverse tower structure and different wire parameters in multi-circuit lines. Most of the normal modeling methods for multi-circuit lines on the same tower are based on the distributed p...Show More
Study on Extracting Method of Distributed Parameters for Non-uniform Transmission Lines
2021 IEEE 4th International Conference on Electronic Information and Communication Technology (ICEICT)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
In this paper, in order to solve the problem about extracting the distributed parameters of 3D vertical bending non-uniform transmission lines, the model of this structure composed of two conductors is studied, and the time domain method for extracting the distributed parameters is discussed. The time domain method is given by analyzing the port characteristics of non-uniform transmission lines an...Show More
Series Compensated Transmission Line Parameter Estimation Based on Kalman Filter
2020 SoutheastCon
Year: 2020 | Conference Paper |
In power systems, accurate transmission line parameters are critical as line parameters are essential inputs to various power system applications. Thus accurate line parameter estimation methods are required. In this paper, new Kalman filter based methods are proposed to estimate line parameters for long transmission lines with different line configurations while considering the effect of measurem...Show More
Series Compensated Transmission Line Parameter Estimation Based on Kalman Filter
Year: 2020 | Conference Paper |
Synchronized phasor based on-line parameter identification of overhead transmission line
2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies
Year: 2008 | Conference Paper |
Cited by: Papers (12)
Overhead transmission line is one of the basic elements of power systems, whose parameters are of great importance to the normal operation of the power system. Thereby how to acquire the accurate parameters of overhead transmission lines is crucial. In this paper a novel method to identify the transmission lines' parameters on-line is deduced, where the data from PMU/WAMS (phasor measurement unit/...Show More
An Approach for Resistance Parameter Identification of Transmission Line Based on Electric Energy Data
2019 IEEE 3rd Conference on Energy Internet and Energy System Integration (EI2)
Year: 2019 | Conference Paper |
With the continuous development of power grid and the massive access of renewable energy sources, the operation characteristics of large power grid are becoming more and more complex. Meanwhile requirements for lean dispatching of power grid are also increasing. Lean operation of power grid with minimum network loss as target is based on the resistance parameter of transmission line. However, the ...Show More
Transmission Line Parameters Estimation using Synchronised Phasor Measurements
Vinícius Curcio de Moraes;Letícia Lacerda Santos de Sousa;Igor Delgado de Melo;Carlos Augusto Duque;Matheus Alberto de Souza;Braulio César de Oliveira
2024 IEEE Power & Energy Society General Meeting (PESGM)
Year: 2024 | Conference Paper |
Transmission lines parameters estimation represents an important issue for power systems operation and planning studies. With the advent of the synchrophasor technology, a large number of new methods has been developed using PMUs (Phasor Measurement Units) based on measurements gathered from sending and receiving ends of a transmission line. This paper presents an optimisation problem formulation ...Show More
Tracking Three-Phase Untransposed Transmission Line Parameters Using Synchronized Measurements
The purpose of the study that is reported in this paper is to develop a method to estimate the parameters of untransposed overhead transmission lines using synchronized measurements. Considering the noise in the measured bus voltages and line currents, a three-phase static state estimation is employed first to estimate the states. Then, the parameters are tracked dynamically by a Kalman filter. St...Show More
A novel de-embedding method suitable for transmission-line measurement
2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)
Year: 2015 | Conference Paper |
A novel de-embedding method on transmission line device under testing (DUT) is introduced in this paper. The technique can be used as an alternative to classic calibration approaches, such as SOLT, TRL, LRM, or LRRM whenever the de-embedded structure is a transmission line. The method only requires two measurement patterns: a true through as test fixture and a total pattern with targeting DUT embe...Show More
Equivalent PI circuit for zero-sequence double circuit transmission lines
2012 IEEE Power and Energy Society General Meeting
Year: 2012 | Conference Paper |
To accurately represent a transmission line, the equivalent PI circuit is required. This representation is based on the distributed parameter line model and fully considers the fact that the parameters including impedance and admittance are uniformly distributed throughout the entire length of the line. For a single-circuit transmission line or a positive/negative sequence double-circuit line, its...Show More
Incorporating Temperature Variations Into Transmission-Line Models
This paper discusses a transmission-line modeling approach that incorporates available ambient temperature information. Several proposed line modeling techniques are studied and include distributed and lumped parameter models. In order to capture the nonuniformity of line parameters caused by temperature gradients, a model with multiple nonuniform segments is also proposed. An automated tool has b...Show More
Investigating the use of a Coaxial Air Line as an Impedance Standard at Low Frequencies
Murat Celep;James Skinner;Stephen Protheroe;Nick Fletcher;Nick Ridler
2024 Conference on Precision Electromagnetic Measurements (CPEM)
Year: 2024 | Conference Paper |
Developing reliable standards for coaxial line systems in the AC-RF gap region has long proven to be challenging. In this work, the use of an N-type coaxial air line as an impedance standard at low frequencies is investigated through a comparison of measurements taken on an LCR meter from 0.1 kHz to 1 MHz with calculated values based on transmission line theory. The results demonstrate the viabili...Show More
Transmission line model with frequency-dependent and nonuniform parameters in frequency and time domain
2015 IEEE 19th Workshop on Signal and Power Integrity (SPI)
Year: 2015 | Conference Paper |
Cited by: Papers (3)
The paper presents a fast and effective method of modeling a nonuniform and dispersive interconnect by means of S-parameters. The paper presents an approach based on the method of successive approximations, but taking into account the dependence on the frequency of line parameters. The concept is to use a rational approximation of the per-unit-length parameter of the line calculated for each frequ...Show More
Standards Dictionary Terms
- Reynolds number
- wind direction
- conductor temperature
- effective (radial) thermal conductivity
- heat capacity (material)
- maximum allowable conductor temperature
- specific heat
- steady-state thermal rating
- thermal time constant
- time-varying weather and current
- transient thermal rating
- f
- AR
- EMC
- IA
- LED
- PE
- SCADA
- SE
- SS
- ac
- dc
- ground resistance
- induced current
- induced voltage
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