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PS Class CT Calculation for 6.9 kV Transformers by Umang Jain is a document available to read on EtoBox.
This document contains calculations for selecting protection class current transformers (CTs) for differential protection of 20/25 MVA and 15 MVA transformers. For the 20/25 MVA transformer, the recommended CT has a knee point voltage Vk of 600V or higher, an excitation current less than 30mA at half the knee point voltage, and a winding resistance Rct of 10 ohms or higher. For the 15 MVA transformer, the recommended CT has a knee point voltage Vk of 400V or higher, an excitation current less than 30mA at h
- Author
- Umang Jain
- Language
- EN