BE1-11g
4
FUNCTIONAL DESCRIPTION
The BE1-11g is a multifunction, numerical relay that
provides a comprehensive suite of protective functions
to detect generator faults and abnormal operating
conditions along with control and metering functions in
an integrated system. This system is suitable for any
generator application and many utility/cogeneration
facility intertie applications. 32 sample per cycle digital
signal processing, with frequency compensation,
extracts the fundamental component for high accuracy
with distorted waveforms and at off-nominal frequency
operation.
The unit has one set of three phase current and voltage
sensing inputs to provide all common protective
functions except generator differential, 87G. The voltage
sensing circuits automatically configure themselves
internally for 1 phase, 3 phase 3 wire, or 3 phase 4 wire
VT circuits. A 4th single-phase auxiliary voltage input is
available for either generator ground sensing or bus
voltage sensing.
The BE1-11g has an independent ground current input,
typically used for applications with a separate ground
CT such as a flux balancing window CT, or to provide
ground backup protection for the generator step up
transformer.
The half rack case is fully drawout with current circuit
shorting provisions. Two Basler Electric half rack IEDs
(Intelligent Electronic Devices) such as primary and
backup BE1-11g or the BE1-11i Intertie Protection
Systems can be dovetailed together to mount in a
standard 19" equipment rack with no special mounting
hardware.
Three independent communications ports, along with
built-in support for Modbus
®
and other common
protocols, provide easy access to integrating the
protection, control, metering, and status monitoring
functions into a substation automation system. The
standard IRIG-B port provides time synchronization
from a master clock.
Tripping by voltage dependent functions 27, 59, 32 will
be blocked if a sensed voltage is lost (60FL).
The target reporting function in the BE1-11g automati-
cally adapts the targets as appropriate. For example,
if both the 50-2 and the 51-1 are set for directional
control and trip for a fault involving a phase, they post
targets for an A phase fault as "50-2 67 A" for the
directional instantaneous trip or "51-1 67 A" for the
directional time trip.
Three independent communications ports are available
in the unit. The front panel USB port provides for
BESTCOMSPlus communications with the relay. The
rear panel RS-485 and optional Ethernet ports provide
support for BESTCOMSPlus, BESTNetPlus, Modbus,
and DNP 3.0 protocols. Modbus or DNP 3.0 are
supported through the RS-485 port. The Ethernet port
will support concurrent Modbus and DNP 3.0 or two
concurrent sessions of DNP 3.0. The Ethernet port may
be defined at the time of order to be either a copper
(RJ-45) or multi-mode fiber optic connection.
A standard IRIG-B port provides time synchronization
for the relay from an external GPS clock.
Real time metering provides Watt, Watt-hour, VAR,
VAR-hour, Voltage, Amp, and unbalance loading
telemetry for the protected equipment. Contact sensing
inputs and alarm monitoring functions provide real time
status information. Remote control is provided by
virtual control and selector switches with select-before-
operate control of programmable outputs.
Figure 2 shows alternate external connections for Vx
and IG. Figures 3A and 3B illustrate typical sensing
connections for stator ground faults, sync check and
ground differential protection. Figure 4 illustrates the
functionality contained within this device, and Figure 5
shows rear panel connections.
Figure 2 - Typical Alternate Connections for Vx and IG
(28 paginas)
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