3. An 11 Kv radial system is shown, utilizing CO-7 relay with relay characterictics given in the figure. The pf is identical for all loads, select relay settings to protect the system. 11 kV 3 2 I2. C.T.R=400/5 C.T.R = 200/5 C.T.R = 200/5 L3 = 6.75 MVA L2= 2.5 MVA L, = 4 MY Isc, = 3200 A Isc,= 3000 A Isc, = 25 Typical time curve type CO 7 over current rela 50-60 cycles 456781012 amperes Time dial setting 3 4 5 6 7 8 9 10 12 14 16 Current as a multiple of tap setting Operating time in seconds

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.