current transformer with a bar primary has 250 turns
in it secondary winding. the resistance and reactance of the
secondary circuit are 1.4 ohms and 1.1 ohms respectively including
the transformer winding. when 5A current flows in the secondary
winding, the magnetism mmf is 80 AT and iron lost is 1.1w.
determine the following (i) ratio error (ii) phase angle error
Compare the differences and similarities between the Current
Transformer (CT) and Rogowski coils. Include drawings, schematic
and equations in your answer.
Define what an electrical potential is
Define what a current is
Define polarized
Why are cells described as polarized?
How do cells maintain their resting membrane potential?
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is
98.77% when delivering full-load current at 0.8 power factor, and
99.13% with half-rated current at unity power factor. calculate:
(a) The iron loss. (b) the full-load copper loss. (c) the
efficiency at 3/4 load, 0.9 power factor