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A 1000kVA 11/0.4kV ONAF cooled tx works on a cycle of 3 hours heavy load and 21 hours light load .The peak load is 140% which can only be maintained for 0.5Hours per hour of time constant .The average cooling air temperature is 20 deg cel.Prepare 24 Hour loading schedule to include the maximum time the peak load can be maintained and the permissible loads that can be maintained for the remaining loads. information; the thermal time constant for an ONAF tx up to 12.5kV is 3 and relevant laoding factors can be assumed (14)

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