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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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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