![]() transformer-protection-relay-setting-calculation-guide 1/23 Downloaded from saudedohomem. 2000:5 CT Excitation Curve and 300:5 Tap Shown With Knee-Point. Knowza is a one stop solution to all The voltage division of (4) allows us to calculate the voltage at the relay by starting at the fault location and working back to the system or starting at the system and working toward the fault. 2 10 NA NA NA 5 NA NA CORE 3 LBB, O/C and E/F Protection Micom-P141/821 1600:1 5P20 30 NA NA NA 5 NA NA CORE 4 Transformer. the protection engineer to size the CT for a particular application. Under fault conditions this 800 amps is divided by a ratio of 20 which results in a current of 40 Amps on the secondary side of the current transformer. The SAB and SAB-D current transformers are used as the source of current for relaying and metering. Let us calculate the Multiplication Factor for our example. ![]() Look at the Cable current rating Chart, 2. ![]() The current transformer has a rated primary current of 100 A and a secondary rated current of 5 A. APPENDIX- B 11 kV CT & VT SIZING CALCULATIONS B-1 of B-22 CALCULATION SHEETS APPENDIX- C RELAY LIST C-1 of C-3.
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