Glossary

AENS:: Average energy not supplied or served, i.e. energy not supplied to the average customer
Anti-islanding protection:: Electrical protection to detect if a section of the distribution network has become isolated or islanded . The embedded generator is tripped to prevent continuous operation of the autonomous power island . Effectively synonymous with loss-of-mains protection
ASAI:: Average system availability index, i.e. the ratio of the total number of customer hours that service was available during a year to the total number of customer hours demanded
ASUI:: Average system unavailability index, i.e. the ratio of the total number of customer hours that service was unavailable during a year to the total number of customer hours demanded
Asynchronous generator:: Synonymous with induction generator. The rotor runs at a slightly faster rotational speed than the stator field. The construction of an asynchronous (or induction) generator is very similar to that of an induction motor of similar rating
Auto-reclose:: The automatic reclosure of a circuit breaker after it has opened when a fault has been detected
Biomass:: Biological material used as fuel for conversion to heat or electrical energy
CAIDI:: Customer average interruption duration index, i.e. average interruption duration per customer interruption
CAIFI:: Customer average interruption frequency index, i.e. average number of interruptions per customer affected per year
CHP:: Combined heat and power
CIRED:: International Conference on Electricity Distribution Networks
Combined Heat and Power:: The simultaneous production of heat and electrical energy. Synonymous with co-generation.

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