6EE8 POWER SYSTEM LAB

1  Study the burden effect on the performance of CT and measure ratio error.

2  Find out the sequence components of currents in three 1-Phase transformers and 3-Phase

transformer and compare their results.

3  (i) Study over current relay.

(ii) Draw the current-time characteristic of an over current relay for TMS=1 & 0.5 and

PSM=1.25  & 1.0.

4  (i) Study percentage bias differential relay.

(ii) Plot the characteristics of a percentage bias differential relay for 20%, 30% and 40%

biasing.

5  Study gas actuated Buchholz relay.