The equivalent circuit of a CCVT is shown in the Figure 1. The values of R L 150VA 4 =6.6 Figure 1 Ci and Cyare 0.0018 µF and 0.0186 µF respectively. Tuning inductor has an inductance of 497H and resistance of 4620 ohm. Xm of the VT referred to 6.6 kV side is 1 MN, core loss = 20 watts per phase, VA burden = 150 VA per phase. Value of Cm for compensating the current drawn by Xm is equal to 3.183 x 10-°F. Answer the followings: a) Verify the appropriateness of choice of L and Cm- b) Find the value of V/V2. c) If the frequency drops to 48 Hz from 50 Hz, calculate the ratio error and phase angle error.

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The equivalent circuit of a CCVT is shown in the Figure 1. The values of
R L
V
1SOVA
150VA
Figure 1
Ci and Chare 0.0018 µF and 0.0186 µF respectively. Tuning inductor has
an inductance of 497H and resistance of 4620 ohm. Xm of the VT referred
to 6.6 kV side is 1 MN, core loss = 20 watts per phase, VA burden = 150 VA
per phase. Value of Cm for compensating the current drawn by Xm is equal
to 3.183 x 10-F.
Answer the followings:
a) Verify the appropriateness of choice of L and Cm.
b) Find the value of V/V2.
c) If the frequency drops to 48 Hz from 50 Hz, calculate the ratio error and phase angle error.
Transcribed Image Text:The equivalent circuit of a CCVT is shown in the Figure 1. The values of R L V 1SOVA 150VA Figure 1 Ci and Chare 0.0018 µF and 0.0186 µF respectively. Tuning inductor has an inductance of 497H and resistance of 4620 ohm. Xm of the VT referred to 6.6 kV side is 1 MN, core loss = 20 watts per phase, VA burden = 150 VA per phase. Value of Cm for compensating the current drawn by Xm is equal to 3.183 x 10-F. Answer the followings: a) Verify the appropriateness of choice of L and Cm. b) Find the value of V/V2. c) If the frequency drops to 48 Hz from 50 Hz, calculate the ratio error and phase angle error.
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