TM 9-6115-730-10
TERM
DEFINITION
Bus
The common power conducting wires or bars to which all power sources
within the power system are connected through their individual circuit
breakers.
Dead Bus
A bus from which all the available power sources are disconnected.
De-energize
To remove voltage from a circuit or device in order to deactivate it.
Droop
Paralleling mode that allows slight fluctuations in frequency so that lagging
generator set can match frequency of companion generator.
EMI
Electromagnetic interference is any electromagnetic disturbance that
interrupts, obstructs or other wise degrades or limits the effective
performance of electronics and electrical equipment as a result of spurious
emissions and responses.
Energize
To apply voltage to a circuit or device in order to activate it.
Excitation voltage
DC voltage applied from the voltage regulator to the generator exciter field
windings.
Generator overload condition
Load greater than the load for which the system or mechanism was intended.
For TQGs, overload is defined as the condition when current in all three
phases exceeds 100% of rated current or when current in a single phase
exceeds 130% of rated current.
Ground fault circuit interrupter (GFCI)
A device intended for the protection of personnel that functions to de-
energize a circuit or portion thereof within an established period of time when
a current to ground exceeds some predetermined value that is less than that
required to operate the overcurrent protection device of the supply circuit.
The TQG convenience receptacle is protected by a GFCI.
Incoming generator
The generator that is being connected to the bus.
Isochronous
generators.
kV
Kilovolt. One kilovolt equals 1000 volts.
KVAR
Kilovolt amperes reactive. Measure of reactive power.
KVARhr
Kilovolt amperes reactive hours. Measure of reactive power over time.
kW
Kilowatt. One kilowatt equals 1000 watts. Measure of real power.
Load bus
Common power conducting wires or bars to which all generator set loads are
connected through their individual circuit breakers.
Overcurrent condition
Any current in excess of the rated current of equipment. The condition may
result from overload, short circuit, or ground fault.
Paralleling
The procedure for synchronizing and connecting two or more generator sets
to a common load bus.
Reverse power
in parallel. For the TQGs, reverse shutdown power occurs when reverse
power exceeds 17% of rated value.
