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General Information
BE1-951
Metering Functions
Metering is provided for all measured currents, voltages and frequency and all derived neutral and negative
sequence currents and voltages. Three phase watts, vars, and power factor is provided. Per phase watts
and and vars is also provided when the VT connection is 4W.
Reporting and Alarm Functions
Several reporting and alarm functions provide fault reporting, demand, breaker and trip circuit monitoring,
as well as relay diagnostic and firmware information.
Energy Data Reporting
Energy information in the form of watt-hours and var-hours is measured and reported by the BE1-951. Both
positive and negative values are reported in three-phase, primary units.
Relay Identification
Two free-form fields are provided for the user to enter information to identify the relay. These fields are used
by many of the reporting functions to identify the relay that the report is from. Examples of relay identification
field uses are station name, circuit number, relay system, purchase order, and others.
Clock
A real-time clock is included with a capacitor backup and is available with an optional battery backup.
Depending upon conditions, capacitor backup maintains timekeeping during an eight to 24 hour loss of
operating power. Battery backup maintains timekeeping when operating power is removed for five years or
longer.
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 sequence 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
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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.
