701 Motor Protection Relay Date Code 20010719
Glossary
Event Report–IN
GL.4
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.
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.
hp Abbreviation for horsepower. 1 hp = 745.7 W.
IA, IB, IC Measured A-, B-, and C-phase currents.
IG Residual current, calculated from the sum of the phase
currents. In normal, balanced operation, this current is
very small or zero. When a motor ground fault occurs,
this current can be large.
IN Neutral current measured by the relay IN input. The IN
input is typically connected to the secondary winding
of a window-CT for motor ground fault detection on
resistance-grounded systems.
To Next Page
Loading...
