Testing of 3-ph,4-w Whole Current Energy Meter

Your question can not be answered as you are not providing your actual connection diagram. A properly connected 3p/4w metering installation will work exactly the same as the phantom 3p/4w load connection.

Any deviations between these will be due to errors in wiring.

the deviation between two wirings is only that in phantom loading the load current returns to the respective phase and dont travel through the 'neutral element ' of the meter whereas in actual load condition the load current terminates back to meter via 'neutral element '

What are you talking about?

There is no such thing as a "neutral element" in a 3ph-4w meter.

Please draw a diagram.

its not a general case . it has been observed in a particular meter and i guess that the only behaviour of internal ciruitary resulted the deviations in errors(test results), actually its a case of sigle phase loads connected to all phases of a 3p-4w meter. also the meter found working accurately under unbalanced currents (single ph loading) & balanced volatages( wth phantom load).contradiction arises out of site test report & lab. test report.

I must conclude that you are providing us here with a lot of GOBALTYGOOK!

I other words - you do not know what you are talking about.

There are only two types of meters used on three-phase, 4 wire circuits . . . and these are . . A true 3-element meter which will meter any load accurately - no matter if it is single or three-phase. AND there is the 2 1/2 element meter (typically used in USA) that fails to properly register certain types of unbalanced loads.

So why don't you tell us what you have, . . . or draw a schematic of what you are talking about, . . . only then will you receive a worthwhile answer.