M-3425A Generator Protection Relay; Appendix C: Self-Test Error Codes - BECKWITH ELECTRIC M-3425A Instruction Book

M-3425A Instruction Book

Appendix C: Self-Test Error Codes

This Appendix lists all the error codes and their
definitions.
Appendix D: Inverse Time Curves
This Appendix contains a graph of the four families
of Inverse Time Curves for V/Hz applications, the
Inverse Time Overcurrent Curves, and the IEC
curves.
Appendix E: Declaration of Conformity
This Appendix contains the Beckwith Electric Co.'s
Declaration of Conformity required by ISO/IEC
17050–1:2004.
1.2 M-3425A Generator
Protection Relay
The M-3425A Generator Protection Relay is a
microprocessor-based unit that uses digital signal
processing technology to provide up to thirty-four
protective relaying functions for generator protection.
The relay can protect a generator from internal
winding faults, system faults, and other abnormal
conditions.
The available internal functions of the relay are
listed in Table 1-1. The nomenclature follows the
standards of ANSI/IEEE Std. C37.2, Standard
Electric Power Systems Device Function Numbers.
The control/status inputs can be programmed to
block any relay function and/or to trigger the
oscillograph recorder. Any of the functions or the
control/status inputs can be individually programmed
to activate any one or more of the programmable
outputs, each with a contact.
With the optional M-3931 HMI Module, all functions
can be set or examined using a local, menu-driven,
2 line by 24 character alphanumeric display. OUT
9–23 and IN 7–14 for units purchased with expanded
I/O can only be set utilizing M-3820D IPScom
Communications Software. The module allows local
metering of various quantities, including phase,
neutral, and sequence voltages and currents, real
and reactive power, power factor, and positive
sequence impedance measurements.
1–2
The relay stores time-tagged target information for
the thirty-two most recent trips. For units equipped
with the optional M-3925A Target Module, LEDs are
used to provide a detailed visual indication of
function operation for the most recent event.
The unit retains up to 472 cycles of oscillograph
waveform data. This data can be downloaded and
analyzed using the M-3801D IPSplot
Oscillograph Analysis Software.
The unit is powered from a wide input range switch
mode power supply. An optional redundant power
supply is available for units without the Expanded
I/O. When expanded I/O option is selected, the unit
includes the second power supply.
The relay includes self-test, auto calibration, and
diagnostic capabilities, in addition to IRIG-B time-
sync capability for accurate time-tagging of events.
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