1-4 BE1-951 General Information 9328900990 Rev L
IRIG
A standard IRIG input is provided for receiving time synchronization signals from a master clock.
Automatic daylight saving time compensation can be enabled. Time reporting is settable for 12 or 24-hour
format. The date can be formatted as mm/dd/yy or dd/mm/yy.
General Status Reporting
The BE1-951 provides extensive general status reporting for monitoring, commissioning, and
troubleshooting. Status reports are available from the front panel HMI or communication ports.
Demand Reporting
Ampere demand registers monitor phase A, B, C, Neutral, ±Power (kW), ±Reactive Power (kvar), and
Negative-Sequence values. The demand interval and demand calculation method are independently
settable for phase, neutral, and negative measurements. Demand reporting records today's peak,
yesterday's peak, and peak since reset with time stamps for each register.
Breaker Monitoring
Breaker statistics are recorded for a single breaker. They include the number of operations, accumulated
interrupted I or I
2
, and breaker time to trip. Each of these conditions can be set to trigger an alarm.
Trip Circuit Monitoring
A trip circuit monitor function is provided to monitor the trip circuit of a breaker or lockout relay for loss of
voltage (fuse blown) or loss of continuity (trip coil open). The monitoring input is internally connected
across OUT1. Additional trip or close circuit monitors can be implemented in BESTlogic using additional
inputs, logic timers, and programmable logic alarms.
Fault Reporting
Fault reports consist of simple target information, fault summary reports, and detailed oscillography
records to enable the user to retrieve information about disturbances in as much detail as is desired. The
relay records and reports oscillography data in industry standard IEEE Comtrade format to allow using
any fault analysis software. Basler Electric provides a Windows® based program called BESTwave that
can read and plot binary or ASCII format files that are in the COMTRADE format.
Sequence of Events Recorder
A 255 event Sequence of Events Recorder (SER) is provided that records and time stamps all relay
inputs and outputs as well as all alarm conditions monitored by the relay. Time stamp resolution is to the
nearest half-cycle. I/O and Alarm reports can be extracted from the records as well as reports of events
recorded during the time span associated with a specific fault report.
Alarm Function
Extensive self-diagnostics will trigger a fatal relay trouble alarm if any of the relay core functions are
adversely affected. Fatal relay trouble alarms are not programmable and are dedicated to the Alarm
output (OUTA) and the front panel Relay Trouble LED. Additional relay trouble alarms and all other alarm
functions are programmable for major or minor priority. Programmed alarms are indicated by major and
minor alarm LEDs on the front panel. Major and minor alarm points can also be programmed to any
output contact including OUTA. Over 20 alarm conditions are available to be monitored including user
definable logic conditions using BESTlogic.
Active alarms can be read and reset from the front panel HMI or from the communication ports. A
historical sequence of events report with time stamps lists when each alarm occurred and cleared. These
reports are available through the communication ports.
Version Report
The version of the embedded software (firmware) is available from the front panel HMI or the
communication ports. The unit serial number and style number is also available through the
communication port.
BESTlogic Programmable Logic
Each BE1-951 protection and control function is implemented in an independent function element. Every
function block is equivalent to its single function, discrete device counterpart so it is immediately familiar
to the protection engineer. Each independent function block has all of the inputs and outputs that the
discrete component counterpart might have. Programming with BESTlogic is equivalent to choosing the
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