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Example 2: A 30 MVA, 11.5 kV/ kV, star-delta power transformer to be protected by differential protection. The high voltage side phase lags behind low voltage side by 30 °. Formulate the complete differential protection for the transformer by selecting CT ratios, CT connections. The continuous current carrying capacity of restraining coils of the differential relay should not exceed 5 Amp. CT ratio is 3000/5 on 11.5 kV side. Determine CT ratio on 69 kV side. 3000/5 11.5 kV 30 MVA 69 kV

Example 2: A 30 MVA, 11.5 kV/ kV, star-delta power transformer to be protected by differential protection. The high voltage side phase lags behind low voltage side by 30 °. Formulate the complete differential protection for the transformer by selecting CT ratios, CT connections. The continuous current carrying capacity of restraining coils of the differential relay should not exceed 5 Amp. CT ratio is 3000/5 on 11.5 kV side. Determine CT ratio on 69 kV side. 3000/5 11.5 kV 30 MVA 69 kV

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Example 2: A 30 MVA, 11.5 kV/ kV, star-delta power transformer to be protected by differential protection. The high voltage side phase lags behind low voltage side by 30 °. Formulate the complete differential protection for the transformer by selecting CT ratios, CT connections. The continuous current carrying capacity of restraining coils of the differential relay should not exceed 5 Amp. CT ratio is 3000/5 on 11.5 kV side. Determine CT ratio on 69 kV side. 3000/5 11.5 kV 30 MVA 69 kV
Transcribed Image Text:Example 2: A 30 MVA, 11.5 kV/ kV, star-delta power transformer to be protected by differential protection. The high voltage side phase lags behind low voltage side by 30 °. Formulate the complete differential protection for the transformer by selecting CT ratios, CT connections. The continuous current carrying capacity of restraining coils of the differential relay should not exceed 5 Amp. CT ratio is 3000/5 on 11.5 kV side. Determine CT ratio on 69 kV side. 3000/5 11.5 kV 30 MVA 69 kV
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