Glossary of Terms - H
Half Cycle of Current - A half loop of current
having a duration of 0.00833 seconds.
Half Loop of current - The amount of time it
takes the current to go from one zero reference to another.
Harmonic - Sinusoidal component of an arc
voltage that is a multiple of the fundamental wave frequency.
Harmonic Distortion - The presence of
harmonics that change an ac voltage waveform from sinusoidal to
complex.
Heat Run Test - A test used to determine the
temperature rise of a device under rated load.
Heavy Duty - A lightning impulse classifying
current category for distribution class arresters defined by
ANSI/IEEE C62.11. A heavy duty rated arrester has a 10,000
amperage impulse value crest (refer to normal duty).
Hertz (Hz) - Expression of ac frequency in
cycles per second, e.g., 60 Hz.
High-amp ELSP - CPS's three inch diameter,
125-200 A, ELSP Fuses.
High Voltage and Low Voltage Windings - Terms
used to distinguish the winding having the greater voltage rating
from that having the lesser in two-winding transformers. The
terminations on the high voltage windings are identified by H1, H2,
etc., and on the low voltage by X1,
X2, etc.
HV - High voltage.
Glossary Index