CT(current transformer) rated electric meter
CT(current transformer) rated electric meter
(OP)
after calibration my electric meter is still innacurate. the contractor says the current transformer(CT)is incorrect. mine was used for control and not for metering, the reasons its innacurate. is this possible? how many types of CT are in the market? what type is use for electric metering?





RE: CT(current transformer) rated electric meter
RE: CT(current transformer) rated electric meter
Sizes?, secondary current?, calibration?, burden (rated and actual)?, at what PU of rated load do you see inaccuracy?, What are you using the measurement for?
A measurement class CT should be accurate to around 200% of rated current. A protection class CT may be inaccurate at low current but will not saturate until a much higher current than a metering class CT.
If you are attempting to determine the kW of a load with a significant inductive or capacitive component with voltage and current alone, then Google "Power factor".
Bill
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"Why not the best?"
Jimmy Carter