(i) Secondary Injection Test
Before conducting the test C.T terminal connected to the relay has to be opened. We inject the current in the relay terminal
using the secondary injection kit. Open all the terminals of the relay that are connected to the C.T and connect any one current injecting
terminal to the secondary injection kit, and also connect the common to the kit. Then connect the NO terminal of the relay to kit NO
terminal, for timer operation. Now set the PSM (plug setting multiplier) and TSM (Time setting multiplier) in the relay. This setting shall be
half of the rated current transformer secondary. Now using the injection kit inject about 2 times/ 5 times / 10times of the PSM setting. Operating time of the relay is displayed in the kit timer. And the value was noted, the same was carried out for various PSM and TSM setting, the final result was compared with the manufacturer‟s data
sheet.