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Question 2 a b с Calculate the VA output required from a CT of 5A rated secondary current when the burden consists of relays requiring 10VA at 5A plus a loop lead resistance of 0.80. What output VA would be required from a CT of 1A rated secondary current for a burden of 10VA at 1A plus lead resistance as in a? An earth fault relay has a burden of 1.0VA at setting and is set at 0.2A. What output voltage must a CT produce to ensure linear operation of the relay at 20 times setting? Assume that CT plus lead resistance is 1.50 and that the relay coil impedance saturates to its unsaturated value at 20 times setting.

Fig: 1