Basler Electric BE1-11t - Manual (Page 13)

9424200995 Rev H 1
Introduction
The BE1-11t Transformer Protection System provides flexible, reliable, and economical transformer
protection, control, monitoring, and measurement functions. The BE1-11t offers phase and neutral current
differential, transformer monitor, overexcitation (V/Hz), overcurrent, directional overcurrent,
over/undervoltage, over/underfrequency, RTD (Resistance Temperature Detector) with remote module,
breaker failure protection, and fuse loss protection. It offers breaker- and trip-circuit monitoring, and
oscillography and sequential events recording. Control features include virtual selector switches, circuit
breaker control, virtual lockout, and variable-mode timers. System metering, status information, and fault
locating are available at the BE1-11t front panel and through the BE1-11t communication ports. The
capabilities of the BE1-11t make it well suited to provide comprehensive transformer protection. The
system is suitable for mounting in OEM cubicle or retrofit switchgear applications. Suitable BE1-11t
applications include transformers associated with generation step up transformers, intertie installations,
network transformer, and distribution feeder step down transformer protection.
A front-panel USB port or optional rear Ethernet port enables local communication between the BE1-11t
and a PC operating with BESTCOMSPlus
® software. BESTCOMSPlus software simplifies the
commissioning process by providing a graphical interface for setting the BE1-11t and configuring a
protection and control scheme for your application. Through BESTCOMSPlus, all BE1-11t settings and
logic can be retained in a file for printing or uploading to other BE1-11t protection systems. Oscillography
and sequential events records can be retrieved from a BE1-11t, viewed, and printed.
Front-panel features include a large, backlit alphanumeric display and LED indicators that display system
parameters, BE1-11t settings, and BE1-11t status. Pushbuttons enable navigation through the display
menu, changes to settings, resetting of targets (with password access), and direct access to virtual
switches.
Applications
The capabilities of the BE1-11t make it ideally suited for applications with the following attributes:
•
Transformer applications where differential protection is required
•
Monitoring the through fault currents that may lead to transformer damage
•
Complete control of the circuit breaker connecting the transformer to the distribution bus
•
Applications where bus protection is provided by a high-speed overcurrent blocking scheme on
the transformer bus mains instead of a dedicated bus differential circuit
•
Isolation between the RTDs and the BE1-11t due to distance between the BE1-11t package and
the RTD module
•
Low burden to extend the linear range of CTs
•
The flexibility provided by wide setting ranges, multiple setting groups, and multiple coordination
curves in one unit
•
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
for typical applications.
•
Directional control and fault recording
•
High-speed Ethernet communications and protocol support
•
The capabilities of a numeric multifunction relay
•
The small size and limited behind-panel projection facilitates modernizing protection and control
systems in existing equipment
•
Detection of low ground current levels (SEF option)
•
IEC 61850 functionality
BE1-11t Introduction