Siemens Sentron SB TP01 Series Information And Instruction Manual page 81

demand The measurement and summation of current or energy
over a specified time, typically 15 or 30 minutes.
demand period The specified time, typically 15 or 30 minutes,
over which current or energy data is collected and from which the
demand value is calculated.
device address See Address.
DLY Time delay (value).
display contrast A setting that can be adjusted to increase or
decrease the contrast of the panel display.
E
EIA Electronic Industries Association.
EIA-232 See RS-232.
EIA-485 See RS-485.
Electronic Bell Alarm Accessory that attaches to the trip unit
and provides a solid-state relay contact for remote indication of
breaker tripping.
EP Expansion Plug.
event log A record of faults and alarms, including the date and
time they occurred.
Expansion Plug Interface between the trip unit and the Multi-
plexer Translator for zone interlocking.
extended protective relaying See Protective Relay Functions.
external neutral sensor The current transformer located on
the neutral bus of a four-wire electrical system.
external power supply An AC/DC converter which supplies
power for the trip unit's metering and communications functions.
F
fault Electrical disturbance such as a short circuit or open cir-
cuit.
fault counter The counter on the trip unit that records breaker
operations.
fixed delay A trip time delay that is a constant value, regardless
of the magnitude of the overcurrent.
frame size See Breaker Frame Size.
G
GF ground fault (protection).
ground fault mode switch The switch on the side of the trip
unit that selects the ground fault sensing scheme, either Residual
(all three phases added) or Ground Return.
ground fault protection Protection against shorts to ground.
ground overcurrent alarm An alarm activated by current in
the ground line exceeding a set limit.
ground return The ground fault sensing scheme in which the
ground fault sensor is located at the neutral connection to
ground.
H
harmonic analysis Mathematical analysis of a waveform to
determine its harmonic components.
I, J
ICCB Insulated Case Circuit Breaker.
idle display mode The trip unit's mode of operation when left
idle for five minutes or longer. The display shows several screens
of data and configuration settings in sequence until a key on the
keypad is pressed. Remote configuration of the trip unit is allowed
only while it is in this mode. It is also available from the View Data
selection on the main menu.
IEC International Electrotechnical Committee. The international
standards organization for electrical and electronic equipment.
I Rating Plug value.
n
2
I t A variable time delay in which the delay is progressively
shorter as the overcurrent value increases. I
tionship between the overcurrent magnitude and time.
INST Instantaneous fault (protection).
instantaneous Overcurrent protection that occurs immediately,
without any delay.
Glossary
2
t describes the rela-
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