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A 1200/5, standard C400 CT with excitation curves shown in the figure, is connected on 600/5 tap. a) What is the secondary voltage corresponding to this tap? b) What is the maximum secondary burden that can be used and still maintain the rated accuracy at 20 times rated symmetrical secondary current? 5000 CURRENT TURN SEC RATIO RATIO RES 100:5 20:1 0.05 200:5 40:1 0.10 300:5 60:1 0.15 80:1 020 100:1 025 400:5 500:5 600:5 120:1 031 3000 2000 1000 Secondary RMS Exciting Volts - V. 500 300 200 100 50 20 10 S 3 2 Typical Excitation Curves for Multi-Ratio C class Current Transformers (Source: IEEE std C37 -110 1996) 800:5 160:1 900:5 180:1 200:1 1000:5 1200:5 041 0.46 051 061 240:1 Ohms at 980 Cbelow this line the Exciting Current for a gire bage for arey Unit will not Exceed the Curve value by more than 25% 1 0.001 0002 0.003 0.005 0.01 ABOVE THIS LINE THE VOLTAGE FOR A GIVEN EXCITING CURRENT FOR ANY UNIT WILL NOT BE LESS THAN 98% OF THE CURVE VALUE 0.02 0.03 003 0.1 0.2 0.3 0.5 Secondary RMS Exciting Amperes - I₂ 19 20 30 30 1.0 1200:5 1000:5 900:5 ¹800:5 600:5 500:5 400:5 300:5 200:5 100:5 20 30 30 100

A 1200/5, standard C400 CT with excitation curves shown in the figure, is connected on 600/5 tap. a) What is the secondary voltage corresponding to this tap? b) What is the maximum secondary burden that can be used and still maintain the rated accuracy at 20 times rated symmetrical secondary current? 5000 CURRENT TURN SEC RATIO RATIO RES 100:5 20:1 0.05 200:5 40:1 0.10 300:5 60:1 0.15 80:1 020 100:1 025 400:5 500:5 600:5 120:1 031 3000 2000 1000 Secondary RMS Exciting Volts - V. 500 300 200 100 50 20 10 S 3 2 Typical Excitation Curves for Multi-Ratio C class Current Transformers (Source: IEEE std C37 -110 1996) 800:5 160:1 900:5 180:1 200:1 1000:5 1200:5 041 0.46 051 061 240:1 Ohms at 980 Cbelow this line the Exciting Current for a gire bage for arey Unit will not Exceed the Curve value by more than 25% 1 0.001 0002 0.003 0.005 0.01 ABOVE THIS LINE THE VOLTAGE FOR A GIVEN EXCITING CURRENT FOR ANY UNIT WILL NOT BE LESS THAN 98% OF THE CURVE VALUE 0.02 0.03 003 0.1 0.2 0.3 0.5 Secondary RMS Exciting Amperes - I₂ 19 20 30 30 1.0 1200:5 1000:5 900:5 ¹800:5 600:5 500:5 400:5 300:5 200:5 100:5 20 30 30 100

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A 1200/5, standard C400 CT with excitation curves shown in the figure, is connected on 600/5 tap. a) What is the secondary voltage corresponding to this tap? b) What is the maximum secondary burden that can be used and still maintain the rated accuracy at 20 times rated symmetrical secondary current? 5000 CURRENT TURN SEC RATIO RATIO 100:5 20:1 200:5 40:1 RES 0.05 0.10 60:1 0.15 300:5 400:5 80:1 500:5 100:1 600:5 120:1 031 800:5 160:1 041 900:5 180:1 0.46 3000 2000 1000 Secondary RMS Exciting Volts - V. 500 300 200 100 50 30 20 10 Typical Excitation Curves for Multi-Ratio C class Current Transformers (Source: IEEE std C37 - 110 1996) S 3 2 020 025 1000:5 200:1 240:1 1200:5 Ohms at 980 Cbelow this line the Exciting Current for a given hage for arey Unit will not Exceed the Curve value by more than 25% 051 061 ABOVE THIS LINE THE VOLTAGE FOR A GIVEN EXCITING CURRENT FOR ANY UNIT WILL NOT BE LESS THAN 98% OF THE CURVE VALUE 45° 1200:5 1000:5 900:5 ¹800:5 600:5 500:5 400:5 300:5 200:5 100:5 1 0.001 0.002 0.003 0.003 0.01 0.02 0.03 0.03 0.1 0.2 0.3 0.5 10 20 30 30 10 20 30 30 10.0 Secondary RMS Exciting Amperes - I
Transcribed Image Text:A 1200/5, standard C400 CT with excitation curves shown in the figure, is connected on 600/5 tap. a) What is the secondary voltage corresponding to this tap? b) What is the maximum secondary burden that can be used and still maintain the rated accuracy at 20 times rated symmetrical secondary current? 5000 CURRENT TURN SEC RATIO RATIO 100:5 20:1 200:5 40:1 RES 0.05 0.10 60:1 0.15 300:5 400:5 80:1 500:5 100:1 600:5 120:1 031 800:5 160:1 041 900:5 180:1 0.46 3000 2000 1000 Secondary RMS Exciting Volts - V. 500 300 200 100 50 30 20 10 Typical Excitation Curves for Multi-Ratio C class Current Transformers (Source: IEEE std C37 - 110 1996) S 3 2 020 025 1000:5 200:1 240:1 1200:5 Ohms at 980 Cbelow this line the Exciting Current for a given hage for arey Unit will not Exceed the Curve value by more than 25% 051 061 ABOVE THIS LINE THE VOLTAGE FOR A GIVEN EXCITING CURRENT FOR ANY UNIT WILL NOT BE LESS THAN 98% OF THE CURVE VALUE 45° 1200:5 1000:5 900:5 ¹800:5 600:5 500:5 400:5 300:5 200:5 100:5 1 0.001 0.002 0.003 0.003 0.01 0.02 0.03 0.03 0.1 0.2 0.3 0.5 10 20 30 30 10 20 30 30 10.0 Secondary RMS Exciting Amperes - I
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