Instrument Transformers. 1.6.1. Current transformer output shall remain within acceptable limits for all anticipated fault currents and for all anticipated burdens connected to the current transformer.
Instrument Transformers. 10.1 CTs and VTs shall conform to the requirement of IS:2705 and IS:3156 respectively. The ratings specified are indicative only and it shall be Vendor‟s responsibility to ensure that the ratings offered are adequate for the relays/meters provided considering lead resistance, etc.
Instrument Transformers. 6.6.1 Instrument transformers shall be completely encapsulated cast resin type, suitable for continuous operation at the ambient temperature prevailing inside the switchgear enclosure, when the switchgear is operating at its rated load and the outside ambient temperature is 50°C.
Instrument Transformers. A. Current transformers can be primary wound or of toroidal type E with current ratios in accordance with those shown on the drawings and ESD. Secondary’s shall have a 5 amp rating. They shall be capable of continuously carrying 150 % of the rated current at 55° C ambient and will be of applicable ANSI relaying accuracy class as specified in the ESD. By itself the CT can be rated 600 volt class 10 kv BIL.
