Uninterruptible Power Supplies (UPS Systems) Flashcards
What two fundamental things does the UPS do?
- It conditions or enhances the normal power
- It provides backup power in the event of loss of normal power
UPS systems are capable of generating single-phase and three-phase from DC. True or False?
True
What are two general classifications of UPS systems?
- On-line
- Off-line (standby)
The ferro-resonant UPS system uses one unique device that is not used in other designs. What is this device?
A special transformer
In terms of cycles of AC, what is the power interruption outage for a typical off-line UPS unit?
one-quarter to one-half a cycle
What type of batteries are commonly used with UPS units?
- Maintenance free
- Lead-acid types
The rated output current of a 120V, 1500 VA UPS unit would be closest to:
a. 10A
b. 12.5A
c. 15A
d. 18A
b. 12.5A
What type of equipment is commonly supplied by UPS units?
Computers
If a UPS unit is to be noted for a while before putting it into service, what are two problems that can arise?
- Possible battery damage due to sulphation
- Condensation problems
What is the function of a bypass switch used with UPS units?
To allow maintenance or repairs to be done on the UPS without load interruption
What is the advantage of using an emergency standby generator in conjunction with a UPS system?
In a power outage, the emergency generator comes on line quickly and this alleviates the load on the battery system. Battery installation cost can therefore be reduced.
When do the rules in Section 46 of the CEC apply to UPS systems?
When the UPS is used for emergency systems
What other section of the Code may apply to UPS units?
Section 26
In practice, UPS units tend to supply “critical” equipment loads rather than “emergency” loads. True or False?
True
