application of s-transform for fault location in combined overhead line and cable distribution networks
Authors
abstract
this paper illustrates the application of s-transform and continuous wavelet transform (cwt) for fault location in combined overhead line and cable distribution networks. the high frequency transient signals originated by faults are analyzed using s-transform and cwt. the s-transform is found to be applicable in transient based fault location in distribution networks. this technique is an expansion of wavelet transform method and is based on a moving and scalable localizing gaussian window. taking into account this fact that the signal energy of faults has high amplitude around certain frequencies, the fault location can be identified considering the relationship between these frequencies and so-called path characteristic frequencies related to the fault traveling waves. the transient voltage signal energy is calculated using s-transform and cwt. in order to demonstrate the effectiveness of the proposed method, the distribution networks with only overhead lines, as well as a combined system (consisting of the overhead lines and underground cables) have been studied. the ieee 34-bus test distribution network is simulated in emtp-rv software and the relevant s-transform and cwt analyses are carried out in matlab coding environment
similar resources
fault location in power distribution networks using matching algorithm
چکیده رساله/پایان نامه : تاکنون روشهای متعددی در ارتباط با مکان یابی خطا در شبکه انتقال ارائه شده است. استفاده مستقیم از این روشها در شبکه توزیع به دلایلی همچون وجود انشعابهای متعدد، غیر یکنواختی فیدرها (خطوط کابلی، خطوط هوایی، سطح مقطع متفاوت انشعاب ها و تنه اصلی فیدر)، نامتعادلی (عدم جابجا شدگی خطوط، بارهای تکفاز و سه فاز)، ثابت نبودن بار و اندازه گیری مقادیر ولتاژ و جریان فقط در ابتدای...
مکان یابی خطا در شبکه های توزیع فشار متوسط دو مداره به روش امپدانسی
Power distribution feeders contains many laterals, sub-laterals, different number of circuit line, load taps, balanced and unbalanced load, different type of lines (cable or overhead), different cross-sections and numerous distribution transformers with different capacities. Moreover, the voltage and current are measured only at the beginning of the feeder. Thus, fault location is very complex....
full textOn the Use of Continuous-wavelet Transform for Fault Location in Distribution Power Networks
The paper illustrates a procedure, based on the continuous-wavelet transform, for the analysis of voltage transients due to line faults and discusses its application to fault location in power distribution networks. The analysis carried out allows us to infer that correlation does exist between some characteristic frequencies of the transformed signal and specific paths in the network covered b...
full textapplication and construction of carbon paste modified electrodes developed for determination of metal ions in some real samples
ساخت الکترودهاِی اصلاح شده ِیکِی از چالشهاِی همِیشگِی در دانش شیمِی بوِیژه شیمِی تجزیه مِی باشد ،که با در نظر گرفتن سادگِی ساخت، کاربردی بودن و ارزان بودن روش مِی توان به باارزش بودن چنِین سنسورهاِی پِی برد.آنچه که در ادامه آورده شده به ساخت و کاربرد الکترودهاِی اصلاح شده با استفاده از نانو ذرات در اندازه گِیرِی ولتامترِی آهن وکادمِیم اشاره دارد. کار اول اختصاص دارد به ساخت الکترود خمِیر کربن اصلاح شده با لِیگاند داِ...
15 صفحه اولEvaluation and Calculation of Overhead Line Impedance in Distribution Networks
Abstract: The determination of the impedance for overhead lines is a critical step before the analysis of distribution feeder such as load flow and short circuit calculation can begin. Because distribution systems consist of single-phase, two-phase, and untransposed three-phase lines serving unbalanced loads, it is necessary to retain the identity of the self and mutual impedance terms of condu...
full textMy Resources
Save resource for easier access later
Journal title:
the modares journal of electrical engineeringPublisher: tarbiat modares university
ISSN 2228-527 X
volume 12
issue 2 2005
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023