2 edition of Digital computer impedance computations for power system distance protection. found in the catalog.
Digital computer impedance computations for power system distance protection.
Jose Carlos de Carvalho Moura
|The Physical Object|
|Pagination||xi, 132 l.|
|Number of Pages||132|
texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK (US) Genealogy Lincoln Collection. National Emergency Library. Top American Libraries Canadian Libraries Universal Library Community Texts Project Gutenberg Biodiversity Heritage Library Children's Library. Full text of "POWER SYSTEM PROTECTION. Computer-Aided Power Systems Analysis: Second Edition is a state-of-the-art presentation of basic principles and software for power systems in steady-state operation. Originally published in , this revised edition explores power systems from the point of view of the central control facility.
If the motor because any reason caused it didn't running, and the power supply still continuing then the motor will increasing the impedance to reducing the current and protecting the motor. •Improve system stability •Minimize damage to equipment •Protect against overloads •Employ relay techs and engineers Computer aided protection • The field of computer relaying started with attempts to investigate whether power system relaying functions could be performed with a digital computer. These investigations began in the s 5/5(1).
For hand calculations, this can be a very time-consuming and error-prone task; with the digital computer such calculations are made quick and accurately, and an entire system may be expeditiously investigated. Figure shows how a simple loop system may be evaluated. The single-line diagram appears in (a). This thesis is concerned with the development of an interactive software which implements the models of digital distance and directional relays on a digital computer. The software uses four techniques for implementing the models. These are amplitude comparison, phase comparison, impedance estimation and memory mapped targeting : Thompson Adu.
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The paper proposes a method of distance-type protection suitable for on-line digital computer protection of transmission lines. The basic principle is the Digital Calculation of Impedance for Transmission Line Protection - IEEE Journals & Magazine.
Digital protection is based on the use of computers in power line relaying. Since the late s, digital devices and techniques have been applied to almost all new protection schemes. Today the technology is moving towards standardised hardware platforms; at the software level, however, there remains a huge variety in approaches and protection algorithms.5/5(2).
Design of digital distance relaying algorithm for fast and accurate estimation of fault impedances for the protection of transmission lines is discussed in this section.
A power system experiencing a fault at B shown in Fig. 1 and corresponding mode-1, mode-2 and mode-0 networks shown in Fig. 2 are used in the development of the proposed by: Various combinations of voltages and currents are possible in the power system in an event of fault.
Distance relays use these voltage and current phasors, obtained from PTs and CTs, to calculate impedance. The relay operates when the calculated impedance is below the reach or set impedance. The operation can be better understood when plotted on an impedance plane. Power Apparatus and Systems, IEEE Transaction son 5, –  McInnes, A.D.
and Morrison, I.F. Real time calculations of resistance and reactance for transmission line protection by digital computer () Elec. Eng. Trans. IE, Australia vol. EE7, no. 1, pp.
16–  Hui-Yung Chu, Shi-Lin Chen and Ching-Lien Huang, “Fault. The basis of a new approach to the measurement of impedance, as used in the distance protection of transmission lines, is given. Digital processing is performed and it is shown that an extremely rapid and accurate indication of the circuit impedance can be effected by an online evaluation of the Fourier transform of a small section of the relaying by: A transmission-line digital impedance protection scheme using vector representation of fundamental components of voltages and currents is presented in the paper.
An algorithm, its implementation and operational characteristics are described along with test results on a Cited by: A distance relay estimates the electrical distance to the fault and compares the result with a given threshold, which determines the protection zone.
In terms of hardware, distance relays have evolved from electromechanical relays to static relays and to microprocessor based (digital) by: 1. Thus, distance relays activate when relay’s apparent impedance decreases to any value inside the parametric circle.
For this reason, the impedance of the line after the fault can also be used to ﬁnd the location of the fault. Like several engineering constructs, a backup is employed for redundancy. defined by physical distance, impedance, or its SIR.
The nominal voltage and the short-circuit level of the system have a much greater effect on whether a line is considered short than either the length or impedance of the line.
Reference  gives an example of a typical kV line and a typical 69 kV line to illustrate this point. In the example,Cited by: 9.
Digital power system protection, as a subject, offers the use of computers in power line relaying which is the act of automatically controlling the power system via instrumentation and control devices. This book is an attempt to make a gentle introduction to the nitty-gritty of digital relays.4/5(1).
This paper presents an Intel microprocessor-based quadrilateral distance relay suitable for the protection of EHV UHV transmission lines. The digital filtering algorithm used for extracting the fundamental frequency components from the complex post-fault relaying signals is based on rationalized Haar transform (RHT).Author: D.
Vishwakarma, B. Ram. Abstract: An algorithim for calculating apparent transmission line impedance to the point of a fault is presented as an approach to distance type protection via a dedicated digital computer.
Phase voltages and currents are sampled asynchronously approximately 24 times per cycle and operated on to yield apparent resistances and by: • Practically every system used in power flow emptied of any power system devices.
© PowerWorld Corporation I Seven Bus Example • Open B7FLAT case – Set Max Per Unit Impedance to to eliminate high impedance equivalent branches – Make sure other.
Published in IEEE Transactions on Power Delivery, vol. 28, no. 4, Oct. DOI: /TPWRD x May 6, Abstract We present an e cient numerical technique for calculating the series impedance matrix of systems with round conductors.
The method is based on a surface admittance operator in combination with the methodCited by: Investigating Performance of Numerical Distance Relay with Higher Sampling Rate Digital Protection for Power Systems.
Book. Distance relays also calculate apparent fault impedance at the. Computer based power system protection using numerical relays have been used for protecting present day power systems. Several computational functions are used in numerical relays.
In this paper, various characteristics and requirements of these computational. The development of digital computers in the s led to investigations to establish the possibility of using them to implement some or all of the protection functions in a power system.
In essence, developments in technology have gradually permitted the migration of the well established fundamental protection algorithms described in previous Author: C. Christopoulos, A. Wright. These impedance estimates were inserted in R − X plane characteristics to determine the suitability of the proposed method for digital distance protection of the second and third zones.
Shrivastava K, Vishwakarma DN () Microcontroller-based numerical quadrilateral relay for the transmission line protection, electric power components and systems, pp – Google Scholar 9.
Ziegler G () Numerical distance protection, 2nd : Abderrahmane Ouadi, Hamid Bentarzi. Keywords: Artificial intelligence, Digital relay, Distance protection, Fuzzy logic, Neural network, Wavelet transform. 1. Introduction Transmission lines are among the power system components with the highest fault incidence rate, since they are exposed to the environment.For example, a transmission line distance relay function will compute the impedance seen by the relay, which can be compared against the relay threshold settings, which is usually a region of the R-X plane that is stored as a relay setting.
A more detailed view of a digital relay system .Most of the faults on power systems result in a substantial increase in current flow towards the fault point.
Over the years, conventional overcurrent based protection schemes have been successfully used to detect and protect against these "low impedance" faults. However, for HIFsFile Size: 40KB.