Paper 5.57 INFORMATION SYSTEM SOLUTION FOR RELIABILITY BASED ANALYSIS AND DEVELOPMENT OF DISTRIBUTION NETWORKS P. Verho, P. Järventausta, A. Mäkinen, K. Nousiainen Tampere University of Technology, Finland M. Pouttu – Koillis-Satakunnan Sähkö Oy, Finland P. Juuti – ABB, Finland

Reliability analysis as part of distribution network planning Long tradition in Finland (since 1980’s) Method development (e.g. customer outage cost model) Integrated to network information system Used widely e.g. in order to plan the optimal location of remote controlled disconnectors Growing interest nowadays due to increased importance of Power Quality Good development possibilities (more data and advanced information technology available)

Recent and ongoing development Voltage dip analysis integrated to the tool Modelling of dynamic failure rates Fault data analysis Modelling of dependency between failure rate and operational circumstances (e.g. component age, environment, over-voltage protection) Updated outage cost modelling Comprehensive planning tool

Results of reliability analysis Load point indices short interruptions 37 / a outages 12 / a outage time 412 min / a voltage dips 140 / a outage and dip costs 2368 € / a Costs caused by a line section customers 341 € / a utility 51 € / a

Operational development Requirements Cost parameters Network development Operational development User Network editor Parameters Results Network performance load flow & fault current technical acceptability reliability Costs operation & maintenance investments fault and outage costs Network analysis Network data Suunnitelma Plan

Conclusions Reliability analysis in important part of modern distribution network planning Recent and ongoing development in Finland includes voltage dips and dynamic failure rates to the reliability analysis