BECKWITH ELECTRIC M-3425, Instruction Book

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M-3425 Instruction Book
1–2
Chapter 4: Remote Operation
This chapter is designed for the person or group
responsible for the remote operation and setting of
the relay using the M-3820A IPScom
®
Communications Software package or other means.
Chapter 5: Installation
The person or group responsible for the installation
of the relay will find herein all mechanical information
required for physical installation, equipment ratings,
and all external connections in this chapter. For
reference, the Three-Line Connection Diagram is
repeated from Chapter 2, Application. Further, a
commissioning checkout procedure is outlined using
the HMI option to check the external CT and VT
connections. Additional tests which may be desirable
at the time of installation are described in Chapter
6, Testing.
Chapter 6: Testing
This chapter provides step-by-step test procedures
for each function, as well as diagnostic mode and
autocalibration procedures for HMI-equipped units.
Appendix A: Configuration Record Forms
This Appendix supplies a set of forms to record and
document the settings required for the proper
operation of the relay.
Appendix B: Communications
This Appendix describes port signals, protocols,
and various topologies, and equipment required for
remote communication.
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.
1.2 M-3425 Generator Protection
Relay
The M-3425 Generator Protection Relay is a
microprocessor-based unit that uses digital signal
processing technology to provide up to twenty-six
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. C37.2-1991, Standard
Electric Power Systems Device Function Numbers.
Six input contacts can be programmed to block any
relay function and/or to trigger the oscillograph
recorder. Any of the functions or the input contacts
can be individually programmed to activate any one
or more of the eight programmable output contacts.
With the optional M-3931 HMI (Human-Machine
Interface) Module, all functions can be set or
examined via a local, menu-driven, 2 line by 24
character alphanumeric display. 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.
The relay stores time-tagged target information for
the twenty-four most recent events. For units
equipped with the optional M-3925 Target Module,
LEDs are used to provide a detailed visual indication
of function operation for the most recent event.
The unit retains up to 170 cycles of oscillograph
waveform data. This data can be downloaded and
analyzed using the M-3801C IPSplot
® Oscillograph
Analysis Software package.
The unit is powered from a wide input range switch
mode power supply. An optional redundant power
supply is available.
The relay includes self-test, auto calibration, and
diagnostic capabilities, in addition to IRIG-B time-
sync capability for accurate time-tagging of events.