Can we connect two or more energy meters/Amp meters on one CT set (Three phases) ?



Can we connect two or more energy meters/Amp meters on one CT set (Three phases) ?

  • Yes we can connect two or more energy meters/Amp meters on one CT set. Actually current always flow in series. So put one wire from ct s1 and connect on first energy meter s1 and put one wire from s2 of first energy meter and connect on s1 of second energy meter and second energy meters s2 connect on ct's s2.
  • Then your current path become fine and there will be same rating in two energy meter which is connected.
  • Like this all phase CT can be connected on energy meter and by making the phase voltage line on meter parallel.

Putting CTs in parallel

  • All of the transformers (CTs) should have a similar nominal ratio, in spite of the rating of the circuits during which they're connected.
  • The secondary leads should be paralleled at the meter and not at this electrical device.
  • There ought to be only 1 ground on the secondary facet of all transformers at their common purpose at the meter.
  • Use fashionable current transformers with low exciting currents and, therefore, very little shunting impact once one or a lot of current transformers ar floating at no load. (Three of a lot of floating current transformers might have a control that ought to be investigated).
  • The secondary circuits should be designed so the utmost potential burden on any electrical device won't exceed its rating. The burden ought to be unbroken as low as potential as its effects are increased in direct proportion to the sq. of the overall secondary current. A Common voltage should be available for the meter. This condition is met if the circuits share a standard bus that's ordinarily operated with closed bus ties.
  • Burdens and accuracies should be fastidiously calculated. If changes are created at the meter to atone for ration and point errors, the magnitude relation and point error corrections used should represent the complete combination of transformers connected as a unit.
  • The watt hour meters should be of adequate current capability to hold while not overload errors the combined currents from all the transformers to that it's connected.
  • Low-voltage, low-burden-capability current transformers don't seem to be suited to the current application since the burden imposed on parallel secondary is also terribly high.
  • Meter voltage typically is supplied with a throw-over relay to avoid loss of meter voltage within the event the conventional provide is de-energized.
CTs in parallel

CTs in parallel


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