Energy meter

"Is it possible to connect three phase energy meter across one current transformer?" Yes

"and how it measure the kwh reading." It will not measure the kwh's correctly. You need one ct per phase.

We are using digital energy meter with one C.T.other two C.T.points are connented in series with frist C.T. and meter is appearing reading.now question is why reading is not correct.please expain.

guest; you must have 3 phase 4 wire energy meter the rule for C.T's N minus one, for a 3 phase 4 wire 3 C.T.'s for 3 phase 3 wire, 2 C.T.'s the C.T.'s must be the right polarity

and on the right phases for a correct reading, also you need to know your multipliers for voltage & ratios of the C.T.'s perry