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Article
REDUCING SHORT CIRCUIT LEVELS BY USING SYSTEM SPLITTING STRATEGIES

Authors: Inaam I. ALI --- Mohanad Sh. Tarad AL-AASAM
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2018 Volume: 11 Issue: 3 Pages: 309-331
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

Preliminary studies on Iraqi power system show a significant increase in the short circuit level at some of the grid substations and some power stations. This increasing results from the growth of the power generation and transmission systems in size and complexity. Islanding or splitting is dividing the power system into several islands inorder to reduce short circuit levels and avoiding blackouts. The main islanding problem is determining the location of proper splitting points and load balance and satisfaction of transmission capacity constraints for each islands.This paper mainly introduces new proposed splitting strategies of large-scale power systems by using (PSS™E version 30.3 PACKAGE PROGRAME), such that, make re-interconnection of 400KV super high voltage substation based on three-phase load flow to be minimum flow at splitting point and infeed fault current details method to control short circuit levels in Iraq power system without islanding the power system into isolated islands. Controlled islanding or splitting scheme is frequently considered as the final solution to avoid blackouts of power system.Simulation IEEE-25 bus and Iraqi power system used as the test systems for this method. Furthermore, simulation results show significant effectiveness on reducing short circuit levels with same time give stable splitting islands with same frequency for preventing the system blackouts.


Article
A Three-phase Test Circuit Design for High Voltage Circuit Breaker Based on Modeling

Author: Haider Muhamed Umran
Journal: Albahir journal مجلة الباهر ISSN: 23125721 Year: 2016 Volume: 4 Issue: 7+8 Pages: 39-51
Publisher: Shiite Endowment ديوان الوقف الشيعي

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Abstract

Modern electric power systems performance depend significantly on theoperation of circuit breakers. Circuit breaker are used to detect disturbance in theelectrical network and to protect the sensitive equipment and costly instrumentssuch as: generators, transformers, and many more. So, they must operate withinextremely tight tolerances especially at the electrical network that operate undera short circuit fault conditions. Evaluation of work efficiency for circuit breakeris an important procedure for demonstrating its ability to curb fault currents,especially short circuit currents and for optimizing reliability of network. Thispaper aims to design a three-phase test circuit used to evaluate the performance ofhigh voltage circuit breaker under short circuit fault by simulation. By this method,the difficulties of practical tests will be overcome, where it doesn't need highelectrical power of real sources, unlimited flexibility to adjust the elements valueof test circuit, safe from the risks, and economic because it dependent on modeling.

تعتمد أنظمة الطاقة الكهربائية الحديثة في أدائها الى حداً كبير على عمل قواطع الدورة الكهربائية. يستخدم قاطعالدورة الكهربائية في أكتشاف اضطرابات الشبكة الكهربائية و لحماية الاجهزة الحساسة و المعدات غالية الثمن مثلالمولدات و المحولات و غيرها من الاجهزة. لذا فأنها يجب ان تعمل ضمن سماحية ضيقة جداً خصوصاً في الشبكةالكهربائية التي تعمل تحت شروط خطاء دائرة القصر. ان تقييم كفاءة عمل قاطع الدورة امر مهم لآثبات قدرته علىايقاف تيارات الخطأ، خصوصاً تيارات دائرة القصر و لتحسين موثوقية الشبكة. تهدف هذه الورقة الى تصميم دائرةاختبار ثلاثية الطور تستعمل لتقييم اداء قاطع الدورة ذات الفولتية العالية تحت شرط خطاء دائرة القصر بأستخدامالمحاكاة. بهذه الطريقة سيتم التغلب على صعوبات الاختبارات العملية كونها لا تحتاج الى قدرة كهربائية عالي منمصادر حقيقية و لها مرونة غير محدودة لضبط قيم عناصر دائرة الاختبار و غير خطرة و اقتصادية.

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