Nikel Alaşımlı Esnek Nüveye Sahip Rogowski Bobinler ve Performans Karşılaştırmaları

Abstract

Elektriksel devrelerin farklı çalışma koşullarında takibi için anlık akımların hassas ve doğru şekilde ölçülmesi gerekir. Geleneksel Rogowski Bobinleri (RB) hava nüveli olduklarından, akım transformatörleri gibi doyum problemleri yaşamazlar. Esnek oldukları için ölçü aletinin giremediği dar alanlarda dahi kolayca bağlanabilirler ve ölçüm yapabilirler. Bu üstünlüklerine karşın nominal akım değerlerinde dahi birkaç mV seviyesinde üretilen sekonder gerilimleri kullanılarak akım ölçümü gerçekleştirirler. Bu nedenle özellikle düşük akım değerlerinde RB ile ölçüm yapmak zordur ve sonuçlar ölçüm hatalarına açıktır. Düşük genlikte ve frekansta akım ölçümlerinde, uygun RB tasarımı ve indikatör seçimi kritiktir. RB tasarımında; iç kesit alanının büyüklüğü ve şekli ile iç ve dış çap gibi fiziksel boyutlar dikkate alınır. Ancak kullanım yerleri fiziksel boyutları da kısıtlayabilir. Fiziksel boyutlarını değiştirmeden RB’in ölçüm etkinliğini arttırmak için, hava-nüveli yapıdan manyetik nüveli yapıya geçiş yapılmalıdır. Bu çalışmada farklı oranlarda Nikel alaşımlar kullanılarak manyetik filamentler üretilmiştir. Manyetik filamentlerin sarılması ile esnek manyetik nüveli RB’ler geliştirilmiştir. Nüvenin esnekliği de dikkate alınarak, iki farklı alaşımlı manyetik filament üretilmiştir. Geliştirilen manyetik filamentlerin bağıl geçirgenlikleri, deneysel çalışmalarla belirlenmiş ve sonlu elemanlar analizi ile 5-400 A aralığında lineer karakteristikleri doğrulanmıştır.

Keywords

• Rogowski Bobini
• Esnek Manyetik Nüve
• Akım ölçümü

Rogowski Coils with Nickel Alloy Flexible Core and Peroformance Comparisons

Abstract

The instantaneous currents must be measured precisely and accurately in order to monitor electrical circuits under different operating conditions. Rogowski Coils (RC) can be easily connected even in narrow spaces where the measuring device cannot enter. They perform current measurement using the secondary voltages produced at a few mV levels even at the nominal currents (3000 - 60000 A). Therefore, it is difficult to make measurements with RCs, especially at low current values such as a few ten amperes, and the results are prone to the measurement errors. In order to increase the measurement sensitivity without changing the physical dimensions of the RC, a magnetic-core structure can be preferred instead of an air-core. In this paper, the magnetic filaments have been produced using nickel alloys at different ratios (40% and 60%). Flexible magnetic-core RCs have been developed by winding the magnetic filaments. Considering the flexibility of the core, the magnetic filaments have been produced in two different alloy ratios. The relative permeabilities of the developed magnetic filaments have been determined by experimental studies and their linear characteristics in the range of 5-400 A have been verified by finite element analysis.

Keywords

• Rogowski Coil
• Flexible Magnetic Core
• Current Measurement

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