- voltage sags (voltage is less than it should be)
- total power failure
- frequency differences (when the power is flowing at something other than 50 Hertz)
There are three types of UPS’s:
- online double-conversion: the inverter constantly supplies a regulated voltage to the load and therefore transfer times are zero.
This is the safest but most expensive power protection.
- line-interactive: Similar to a standby UPS but includes a variable-voltage auto-transformer
- offline/standby: Basic features, providing surge protection and battery backup, which is more for a small business or your home.
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[for the home]
The UPS was not invented by one particular person but is the culmination of a lot of different theories and studies.
The most common reason for UPS failures is their batteries.
Consistent battery maintenance is required.
The lifespan of UPS batteries depends on many conditions:
- environmental conditions
- power quality
- number of discharges
- other batteries connected in the series
Three-phase UPS’s use either standard UPS batteries which are usually used in legacy units or plug-in-play batteries.
Standard batteries are difficult to change and require a manual testing procedure.
Plug-in-play batteries are automatically tested by the UPS and are designed for easier changing.
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