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The positive-sequence line impedance as well as CT and VT ratios at B1 for the 33...

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Electrical Engineering

The positive-sequence line impedance as well as CT and VT ratiosat B1 for the 33 kV system as shown in Table 1 and Table 2 below:

Table 1

LinePositive Sequence Impedance
1-24+j30
2-34+j40
3-44+j50

Table 2

BreakerCT RatioVT Ratio
B1100/5 A33000/5 V

Zone 1 reaches 90% of the protected line while zone 2 extendbeyond the protected line up to 50% of the adjacent line and Zone 3covers the protected line up to 25%. Determine the settings Zr1,Zr2 and Zr3 for the B1 three-zone, directional impedance relays.Draw its MHO relay diagram and impedance relay diagram.

Answer & Explanation Solved by verified expert
4.3 Ratings (752 Votes)
Transmission line impedence transferred to relay side is givenasSo The    See Answer
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