A low - cost high performance MV RMU with circuit breakers for use in remote controlled MV / LV substations Fabio GIAMMANCO Luca GIANSANTE 1 1

Main content Italian AEEG regulation scenario Main strategies Limits of current switchgear Overcome apparatus limits New approach State of the Art: DY900 Results Developments Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 2

Italian AEEG regulation scenario Italian Authority for Electrical Energy and Gas (AEEG) > 3 minutes CUMULATIVE DURATION OF LONG LASTING SUPPLY INTERRUPTION PER LV CUSTOMER Planned Accidental with fault localization Accidental without fault localization Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 3

Italian AEEG regulation scenario FRAME REGULATION DURATION OF LV CUSTOMER SUPPLY INTERRUPTIONS WITHOUT NOTICE NUMBER OF SUPPLY INTERRUPTIONS WITHOUT NOTICE PER LV CUSTOMER INDIVIDUAL REGULATION NUMBER OF CUSTOMER SUPPLY INTERRUPTIONS (FOR MV CUSTOMERS ONLY) LONG LASTING INTERRUPTIONS (LV AND MV CUSTOMERS) Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 4

Italian AEEG regulation scenario FOCUS DURATION OF LV CUSTOMER SUPPLY INTERRUPTIONS NUMBER OF SUPPLY INTERRUPTIONS WITHOUT NOTICE PER LV CUSTOMER Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 5

Main strategies REDUCE THE TIME NECESSARY TO FIND AND ISOLATE THE FAULT KEEPING IT AS SHORT AS THE 3 MIN DEADLINE MINIMIZE THE NUMBER OF CUSTOMERS AFFECTED BY THE FAULT Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 6

Limits of current switchgear SWITCH DISCONNECTORS MAIN LIMITS OPERATION TIME MAKING AND BREAKING CAPABILITY ELECTRICAL AND MECHANICAL ENDURANCE Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 7

Overcome apparatus limits THE GOAL TO OVERCOME THE SWITCH DISCONNECTOR LIMITS WHILST FINDING A GOOD TRADE-OFF BETWEEN THE NEED FOR THE EXPECTED PERFORMANCE AND LIFETIME COSTS Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 8

Overcome apparatus limits CIRED WIEN 2007 CIRED PRAGUE 2009 Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 9 9

Overcome apparatus limits With ICS DY800 Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 10 10

New approach Compact RMU with circuit-breaker per each line with disconnector and grounding switch Configuration: 2LineCB + 1PT Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 11

State of the art: DY900 High perfomance Highly reliable in polluted networks Underwater immersion resistant Compatible with remote control smart units Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 12 12

Results DY900 is fast, accurate, reliable and easy to adapt into existing systems. 10% - 15% reduction of the cumulative duration of long lasting supply interruption per LV customer. 40% reduction of the number of interruptions per customer. Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 13

Results High level of performance and economy Adoption of SF6 insulated solutions Reliability and operational safety Environmental issue Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 14 14

Next developments Two additional configurations: 3LineCB + 1PT and 3LineCB. Device for MV customer connection SF6 insulated with current and voltage transformer inside. Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 15

Next developments Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 16

THANKS FOR YOUR ATTENTION Luca GIANSANTE – ITALY – Session 3 – Paper ID0468 17