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Measurement Error Correction (MEC). Voltage transformers (VTs) and current transformers (CTs) that do not meet the 0.3 Accuracy Class of IEEE Std C57.13 Standard Requirements for Instrument Transformers¹;
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Measurement Error Correction (MEC) • Voltage transformers (VTs) and current transformers (CTs) that do not meet the 0.3 Accuracy Class of IEEE Std C57.13 Standard Requirements for Instrument Transformers¹; • ¹A Measurement Error Correction will not be applied to VTs and CTs with accuracy's greater than 0.3 ANSI accuracy class until May 1, 2006. After May 1, 2006 a Measurement Error Correction equal to the ANSI accuracy class will be applied for each individual set of VTs and CTs. For example, VTs with a 0.6 ANSI and CTs with a 0.6 ANSI with give a Measurement Error Correction equal to 1.12 and the correction will always be in favour of the Market.
Measurement Error Correction (MEC)-continued • For FCFkVAR the cosine function in the FCFkW are replaced by the sine function². • ²At this time all MEC for Reactive Power kVAR is not used in the IMO system and therefore, maybe omitted.
Satisfactory to the IMO • All consumption must be metered • losses must be applied correctly as per market rules • radial line losses • express feeders, no taps • transformation losses • total loss factor (TLF) • embedded, therefore must have a primary RWM meter • MMP’s area of responsibility does not change
