Billing metering using sampled values according IEC 61850-9-2 for substations

Abstract

Substations - linking the transmission network (Super Grid) and the distribution network (Smart Grids) - will play a crucial role in the future extension of the energy network. The IEC 61850 standards suite is the most promising collection of standards for the design of substation communication and automation systems and has become accepted by utilities. Up to now there were no metering devices for billing according to IEC 61850 available on the market. Sampled values according to IEC 61850-9-2 can be used as input for high precisions metering. The meter as “cash-generator” in substations stores and transfers the billing values to the data acquisition system to support the billing process. The established standards for meters and data acquisition are DLMS/COSM. Further, DLMS/COSEM and IEC 61850 are based on similar structures with object models. To prove the suitability of this new metering solution based on sampled values installations are placed in substations in parallel to conventional metering solutions. Leading substation suppliers presented at CIGRE 2012 a new generation of substations with sampled values for voltage and current instead of conventional instrument transformers. Since 2012 several substations using sampled values as input for all devices were introduced worldwide. The results from thus installations are very encouraging.