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Q#1 Power System Protection GATE EE 1991 MSQ +2 marks -0 marks

A 50 MVA, 132/66 kV, , three phase power transformer is protected by percentage differential relays. If the current transformers (CTs) located on the delta and wye sides of the power transformer are 300/5A and 1200/5A respectively.        

The output current at full load = 2.104 A

The relay current at full load = 0.2815 A

The minimum relay current setting to permit 25% overload = 17.92%

The minimum relay current setting to permit 25% overload = 18.32%

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Network Analysis 259 0 0
Signals and Systems 164 0 0
Control Systems 201 0 0
Analog Electronics 180 0 0
Digital Electronics 148 0 0
Electrical Machines 390 0 0
Power Electronics 237 0 0
Power Systems 343 0 0
EMFT EE 9 0 0
Measurement 152 0 0
Engineering Mathematics 225 0 0
General Aptitude 206 0 0