FAC Flashcards
(13 cards)
The primary reason for using backup power supplies is:
to ensure continuity of service
The term UPS means:
Uninterruptable Power Supply
The importance of using air condition systems is:
to set optimal environment for both people an equipment
Principle of availability (n+1) in ACT facilities
Total number of systems = regular number of systems + one system safety margin
What is rated/nominal current?
Max. electr. current in normal operation up to which the equipment operates safely and beyond which the equipment may get damaged
Purpose of electrical equipment earthing (grounding)
- Electrical shock protection
- protection against equipment damage
Emergency power (diesel generators)
- Advantage: long time independent supply by refuel
- Disadvantage: time delay to start up, maintenance
Uninterruptible power supply (UPS)
- Continuous power without any switching
- Advantage: high quality power
- Disadvantage: battery storage, thermal losses, stand-alone for several minutes
-Principle: battery converts chemical energy directly to electrical energy
What are essential components of UPS?
- Lead-acid battery: producing direct current only
- Inverter: converts DC to AC
- Rectifier: charges battery and powers the inverter
Internal failure or maintenance of UPS
- Electronical bypass: automatic, bypassing battery
- Manual bypass: bypassing whole UPS unit
Static transfer switch (STS)
Switch over without gap while 2 sources are synchronous
Most critical components of air conditioning
Ventilators of the chillers
What is supplied with power by the UPS?
Main ATC-Systems (e.g. CWP) are supplied with power (Air conditioning is not supplied with power)
