Protection Type Current Transformer Modeling with Air Gaps

O. Ozgonenel[1], B. Cepken[2], B. Cilsal[2]
[1]Ondokuz Mayis University, Turkey
[2]ESITAS, Turkey
Published in 2019

Current transformers (CTs) used for the purpose of measurement and design of our company has come a long way and have original designs. In the proposed paper, protection type current transformer design and manufacturing at medium voltage level (up to 36 kV) will be modeled. Protection type current transformers are used in case of current conditions where the current measurement function is required in the power system (percentage protection, distance protection, over-current relays etc.). Traditionally, the protection current transformers (at MV and HV levels) are in the standards of 5P and 10P (accuracy) and are manufactured in the core structures required by these standards. In the design phase, permanent flux factor, K, will be modified within the values of <= 10%.

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