Siemens SIMPRO-100 Instruction Manual page 233

SIMPRO-100
Delta
As used in this instruction manual, a
phase-to-phase connection of voltage
transformers for electrical measuring
purposes. Typically, two voltage transformers
are used with one primary lead of the first
transformer connected to A-Phase and the
other lead connected to B-phase. The second
voltage transformer is connected to measure
the voltage from B-phase to
C-phase. When two transformers are used,
this connection is frequently called
"Open-Delta."
Demand Meter
A measuring function that calculates a rolling
average or thermal average of instantaneous
measurements over time.
Dropout Time
The time measured from the removal of an
input signal until the output signal deasserts.
The time can be user settable, as in the case
of a logic variable timer, or can be a result of
the characteristics of an element algorithm, as
in the case of an overcurrent element dropout
time.
E
EEPROM
Abbreviation for Electrically Erasable
Programmable Read-Only Memory.
Nonvolatile memory where relay settings,
event reports, SER records, and other
nonvolatile data are stored.
Event Report
A text-based collection of data stored by the
relay in response to a triggering condition
such as a fault or user command. The data
shows relay measurements before and after
the trigger, in addition to the states of
protection elements, relay inputs, and relay
outputs each processing interval. After an
electrical system fault, use event reports to
analyze relay and system performance.
PRIM-2400C
F
Fail-Safe
Refers to an output contact that is energized
during normal relay operation and
deenergized when relay power is removed or
if the relay fails.
Fast Meter, Fast Operate
Binary serial port commands that the relay
recognizes at its front- and rear-panel
EIA-232 serial ports. These commands and
the relay's responses make relay data
collection by a communications processor
faster and more efficient than transfer of the
same data using formatted ASCII text
commands and responses.
FID
Relay firmware identification string. Lists the
relay model, firmware version and datecode,
and other information that uniquely identifies
the firmware installed in a particular relay.
Firmware
The nonvolatile program stored in the relay
that defines relay operation.
Flash
A type of nonvolatile relay memory used for
storing large blocks of nonvolatile data, such
as load profile records.
Fundamental Frequency
The component of the measured electrical
signal whose frequency is equal to the normal
electrical system frequency, usually 50 or
60 Hz. Generally used to differentiate
between the normal system frequency and
any harmonic frequencies present.
Glossary
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