Polarity - In electricity, the condition of being positive or negative.
Transformer short-circuit voltage (Uscx %) - Relative measurement (%) of the internal impedance of a transformer. This short-circuit impedance is commonly called the short-circuit voltage because it is measured during a short-circuit test (shorted secondary winding subjected to a current set to In). For most common three-phase transformers, this value ranges between 3 and 6%.
Switching Transients - Rapid voltage peak up to 20,000 volts with a duration of 10mS to 100mS.
Charge Control - Technique for effectively terminating the charging of a rechargeable battery.
Output (rated) - Apparent power Pn that the UPS can deliver under given load conditions (power factor = 0.8).
Open-Circuit Voltage (OCV) - The difference in potential between the terminals of a cell when the circuit is open (no-load condition).
Percent load - Ratio between the power Pu drawn by the load and the rated output Pn of a UPS system (Pu/Pn). Sometimes referred to as the load factor.
