Chapter 11

Distribution System Reliability

Mind moves matter.

Virgil

What is mind? No matter. What is matter? Never mind.

Thomas H. Key

If a man said ‘all mean are liars’, would you believe him?

Author Unknown

11.1 Basic Definitions

Most of the following definitions of terms for reporting and analyzing outages of electrical distribution facilities and interruptions are taken from Ref. [1,15] and included here by permission of the Institute of Electrical and Electronics Engineers, Inc.

Outage: Describes the state of a component when it is not available to perform its intended function due to some event directly associated with that component. An outage may or may not cause an interruption of service to consumers depending on system configuration. ...

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