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General Information
BE1-951
Human-Machine Interface (HMI)
Each BE1-951 comes with a front panel display with five LED indicators for Power Supply Status, Relay
Trouble Alarm, Minor Alarm, Major Alarm, and Trip. The lighted, liquid crystal display (LCD) allows the relay
to replace local indication and control functions such as panel metering, alarm annunciation, and control
switches. Four scrolling pushbuttons on the front panel provide a means to navigate through the menu tree.
Edit and Reset pushbuttons provide access to change parameters and reset targets, alarms, and other
registers. In Edit mode, the scrolling pushbuttons provide data entry selections. Edit mode is indicated by
an Edit LED on the Edit pushbutton.
The LCD has automatic priority logic to govern what is being displayed on the screen so that when an
operator approaches, the information of most interest is automatically displayed without having to navigate
the menu structure. The order of priorities are:
Å
Recloser active
Æ
Targets
Ç
Alarms
È
Programmable automatic scrolling list
Up to 16 screens can be defined in the programmable, automatic scroll list.
Communication
Three independent, isolated communication ports provide access to all functions in the relay. COM0 is a nine
pin RS-232 port located on the front of the case. COM1 is a nine pin RS-232 port located on the back of the
case. COM2 is a two wire RS-485 port located on the back of the case.
An ASCII command interface allows easy interaction with the relay using standard, off the shelf
communication software. The ASCII command interface is optimized to allow automation of the relay setting
process. Settings files can be captured from the relay and edited using any software that supports the *.txt
file format. These ASCII text files can then be used to set the relay using the send text file function of your
communication software.
ASCII, Modbus
TM
, DNP 3.0 and Basler
®
TNP protocols are optionally available for the RS-485
communication port. A separate instruction manual is available for each available protocol. Consult the
product bulletin or the factory for availability of these options and instruction manuals.
PRIMARY APPLICATIONS
The BE1-951 Overcurrent Protection System provides complete circuit protection with multiple overcurrent
elements and is intended for use in any directional or non-directional overcurrent application. Its unique
capabilities make it ideally suited for applications where:
•
Applications that require low burden to extend the linear range of CTs.
•
Applications that require high accuracy across a wide frequency range such as for motor, generator,
and generator step-up transformer protection, or in co-generation facilities.
•
Applications that require the flexibility provided by wide settings range, multiple setting groups, and
multiple coordination curves in one unit.
•
Applications that require the economy and space savings provided by a multifunction, multiphase
unit. This one unit can provide all of the protection, control, metering, and local and remote
indication functions required on a typical circuit.
•
Applications that require directional control and fault locating.
•
Applications requiring protection of an intertie between dispersed storage and generation facilities
(DSG) and a utility.
•
Transformer backup applications where overexcitation protection is required.
•
Applications that require communications and protocol support.
•
Applications where the capabilities of a digital multifunction relay are required, yet draw out
construction is also desirable.
