Departement of Electrical Engineering, Universitas Indonesia, Depok 16424, Indonesia

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Abstract: Transmisson lines are a crucial part of the power system, as it provides the path to transfer generated power to the load. The main challenge to its protection lies in reliably and isolating faults to secure the system. Commonly, in two terminal transmission line, the Current Transformer Ratio (CTR) are equal. Hence, it is a challenging situation if the system have different CTR. This study, is to determine Alpha Plane characteristics method of Line Current Differential protection to solve high voltage transmission protection with different CTR condition. The Alpha plane is a method using the complex plane to plot the ratio of remote and the local current. The internal fault is simulated using secondary current injection to test the protection scheme of two Line Current Differential relays (87L). The result show that the Alpha Plane characteristic method are able to perform as Line Current Differential protection with different CTR, with average trip time around 48.6ms.

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