This paper is a summary of ''System Protection and Voltage Stability''
, a special publication [1] prepared by Protection Aids to Voltage Sta
bility Working Group of the Substation Protection Subcommittee of the
IEEE Power System Relaying Committee. This summary describes the risk
and mechanism of voltage collapse and suggests some operating, system
upgrades, and protection solutions. Various undervoltage load shedding
schemes are discussed, including actual or planned installations.