Rapid development of the technologies based on the IEC 61850-9.2 standard has led to the extensive use of IEC-supporting equipment both for relay protection and automation and for revenue metering. Application of the standard is based on receiving digital measurements either from digital instrument transformers, or from converters. In this article we will review the effects which occur during the construction of revenue metering systems using digital instrument transformers: optical for current measurement, and electronic for voltage measurement, combined with digital energy meters. Revenue electricity metering using digital metering systems READ (PDF)