Determine the maximum secondary burden for a 1200/5, C400 CT, connected on the 1100/5 tap, that can be used to maintain the rated accuracy at 20 times rated symmetrical secondary current. Figure Q1(b) represents the typical excitation curve for multi-ratio C class CT.

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10.000
CURRENT TURNS SECY
RATIO
Below the dashec ine he
exciting curent for a civen
votage for any unt ail ot
eceed the curve value
Above the dashed ine, the
voltaoe or a olven exciting
currert for any unit will not
be less than Nof the
arve value
500
RATIO RES
ohs
30oc
2000
100S
2005
201
40.1
G.05
C.10
0.15
0.20
0.25
by more than 2%
3005
4005
5005
6005
8005
0005
1000
1200
01
100 1
1201
1601
1001
200 1
2401
1000
0.41
0.46
0.01
300
20
130
0.001 0002 0 005 0.01 0.02 00 01 62
50 100
Secondary Exciting Current - I, - amps rms
Figure Q1(b)
Secondary Exciting Votage - V- volts ms
Transcribed Image Text:10.000 CURRENT TURNS SECY RATIO Below the dashec ine he exciting curent for a civen votage for any unt ail ot eceed the curve value Above the dashed ine, the voltaoe or a olven exciting currert for any unit will not be less than Nof the arve value 500 RATIO RES ohs 30oc 2000 100S 2005 201 40.1 G.05 C.10 0.15 0.20 0.25 by more than 2% 3005 4005 5005 6005 8005 0005 1000 1200 01 100 1 1201 1601 1001 200 1 2401 1000 0.41 0.46 0.01 300 20 130 0.001 0002 0 005 0.01 0.02 00 01 62 50 100 Secondary Exciting Current - I, - amps rms Figure Q1(b) Secondary Exciting Votage - V- volts ms
(b) Determine the maximum secondary burden for a 1200/5, C400 CT, connected
on the 1100/5 tap, that can be used to maintain the rated accuracy at 20 times
rated symmetrical secondary current. Figure Q1(b) represents the typical
excitation curve for multi-ratio C class CT.
Transcribed Image Text:(b) Determine the maximum secondary burden for a 1200/5, C400 CT, connected on the 1100/5 tap, that can be used to maintain the rated accuracy at 20 times rated symmetrical secondary current. Figure Q1(b) represents the typical excitation curve for multi-ratio C class CT.
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