Glossary

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A
A1
AC
ACD
ACK
ACL
ACU
A-D
Ada
ADC
ADH
ADM
ADP
AE
AES
AFJ
AFR
AI
AIG
AIN
AIS
AJ
AK
AKM
ALC
ALE
ALU
AMA
AMI
AMS
ANI
AOS
AP
APC
APD
APL
App
APU
AR
Arg
ARQ
ARS
ASU
AV
AVP
Auxiliary Power
  • An alternate source of electric power, serving as backup for the primary power at the station main bus or prescribed sub-bus. Note: An off-line unit provides electrical isolation between the primary power and the critical technical load; an on-line unit does not. Class A power source is a primary power source; i. e. , a source that assures an essentially continuous supply of power. Types of auxiliary power service include: Class B: a standby power plant to cover extended outages (days); Class C: a quick-start (10 to 60 seconds) unit to cover short-term outages (hours); Class D: an uninterruptible (no-break) unit using stored energy to provide continuous power within specified voltage and frequency tolerances. See also power, primary power, station battery.