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| Temperature Compensation |
| Adjustment of the rectifier output voltage to
provide the optimum charging voltage for the battery. One of
the components in system voltage control, calculated by the
Supervisory Module calculation based on battery temperature. |
| Temperature Sensor |
| A sensor that is used to produce a variable electrical
output representing the temperature of a component, typically
a battery. |
| Terminal |
| A connector for attaching a conductor to an electrical
apparatus. |
| Three Phase Power (3Ø) |
| Power that is provided by a single source with
three output with a phase difference of 120° between any
two of the three voltages and currents. |
| Transfer Switch |
| A switch which will transfer current from one
circuit path to another without interrupting the flow of the
current. |
| Transformer ( T ) |
| A device that raises or lowers the voltage of
an alternating current electrical source. |
| Transient |
| The fast radical change in a smooth sine wave
that occurs in both voltage and current waveforms during the
transition from one steady-state operating condition to another. |
| Trickle charge |
| With the trickle charging process, the battery
receives a constant voltage feeding a low current. Constant
use of this method dries the electrolyte and corrodes the plate,
reducing potential battery service life up to 50 percent. |
| Two- Phase Power |
| Power which is provided by a single source with
two outputs which may be 180 degrees out of phase or 120 degrees
out of phase. |
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| UL |
| Underwriters Laboratories. An approval organization
based in the United States. |
| Uninterruptible Power System (UPS) |
| A system designed to automatically provide power,
without delay or transients, when he normal power supply is
incapable of supplying acceptable power. Some UPSs also filter
and /or regulate utility power. |
| UPS Topology |
| Overall term describing the internal circuitry
of a UPS. There are three basic UPS topologies: standby (off-line),
line-interactive and online. |
| User-Replaceable Batteries |
| User replaceable batteries allow the user to easily
exchange UPS batteries, once the unit has been turned off. |
|
| VOLT ( V ) |
| The unit of measure for voltage. Voltage is the
electrical pressure which forces the current to flow in a conductor
such as a wire. |
| Volt-Ampere ( VA ) |
| Voltage (V) multiplied by the current (ampere);
apparent power. For instance, a device rated at 10 amps and
120 V has a VA rating of 1200 or 1.2 KVA. |
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| WALK-In-Time |
| The time that the rectifier takes to reach rated
output current after the start Up Delay. The slope is fixed
so that a lower output current will have a shorter walk in period. |
| Walk-In |
| The process of gradually ramping up rectifier
output voltage (and current) at start up to prevent a large
input current surge. |
| Watt ( W ) |
| The process of gradually ramping up rectifier
output voltage (and current) at start up to prevent a large
input current surge. |
| Wye Connection |
| A three-phase source of load connection, with
a single common junction and three phase lines out or in. |
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