Abstract
Enhancement of Distance Relay Performance in Transmission Line Compensated by Series Capacitor Protected by MOV Abstract The normal distance relay face many challenges in a series compensated transmission lines the distance relay may give incorrect decision. This paper present a digital distance relay designed by using wavelet transform (WT) to work with this compensated transmission lines. The relay have another features to recognize between fault and disturbance cases , classify fault types and giving the trip signal to circuit breaker in a time less than period quarter. The relay has been tested for both simulation cases and practically cases by simulation transmission lines board in the lab. Index Terms: Distance relay , fault detection , Series-Compensated Lines Protection, wavelet transform, MOV تحسين أداء مرحلة المسافة للخطوط المعوضة باستخدام متسعات MOV التوالي المحمية بواسطة أ.د. مأمون فاضل الكبابجي ظافر عبد الله فتحي قسم الهندسة الكهربائية جامعة الموصل الموصل – العراق Al_kababjie@yahoo.com almohands_dm@yahoo.com الخلاصة مرحلة المسافة الاعتيادية تواجه عدة تحديات عند العمل في خطوط نقل الطاقة الكهربائية المعوضة باستخدام م ت س ع ات ا لت و ا لي و له ذ ا ف ان م ر ح لة ا لم س اف ة م ن ا لم م ك ن ان ت ع ط ي ق ر ار ا خ اط ئ ا . ه ذ ا ا لب ح ث ي ق د م م ر ح لة م س اف ة ص م م ت باستخدام تقنية التحويل المويجي لتكون قادرة على العمل في مثل هذه الخطوط المعوضة. المرحلة المصممة تمتلك مزايا اضافية والتي تتضمن كشف العطل وتمييزه عن حالات الاضطراب اضافة الى تصنيف نوع العطل واعطاء اشارة افلات الى قاطع الدورة في زمن اقل من ربع موجة .تم اختبار المرحلة المصممة لكل من حالة النمذجة على الحاسوب والحالة العملية في مختبر خط النقل. Received: 2 – 5 - 2013 Accepted: 4 – 9 - 2013 Prof. Dr. Maamoon F. AL-Kababjie Dhafer. A . AL_Nuaimy Department of Electricity University of Mosul Mosul, Iraq Al_kababjie@yahoo.com almohands_dm@yahoo.co
Highlights
There are several types of electric devices affected by faults and disturbances, distance relay is one of these devices
Some typical results illustrate the performance of the protection technique being developed . single line to ground, double line to ground and three line to ground faults at (10%, 50%, 90%) from the length of the transmission line shown in fig (3) are implemented
From the results shown in table (1) it can be seen that all peak of the currents are less than the threshold value (Th1=2.355 Amp), so the relay will not respond to these disturbance cases
Summary
There are several types of electric devices affected by faults and disturbances, distance relay is one of these devices. The main target of these relay is to calculate impedance at the fundamental frequency between the relay point and the fault point According to this impedance, the fault will determine if it was inside or outside the protection zones. The fault will determine if it was inside or outside the protection zones This impedance is calculated from the measured voltage and current signals at the relay position [1]. The basic difference is that, in compare to the short time Fourier transform which uses a single analysis window, the WT uses short windows at high frequencies and long windows at low frequencies. The basic functions in WT employ time compression or dilation rather than a variation in time frequency of the modulated signal [1]
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