Specifications

10
BE1-24 Volts Per Hertz Relay,
BE1-25 Sync-Check Relay
BE1-24 Volts Per Hertz Relay
(Request bulletin UDN)
Application
Provides overexcitation protection for machines,
transformers, and reactors.
Features
• Integrating inverse square time delay remembers
excursions
• Front panel indication of time accumulated toward trip
• Linear reset models the machine cooling
• Alarm may be set to operate before relay trips
• Instantaneous function
• Pickup and reset functions independently resettable
BE1-25 Sync-Check Relay
(Request bulletin UBP)
Application
Checks for proper phase angle and voltage before
closing breaker.
Features
• Direct reading thumbwheel switches for setting phase
angle and time delay
• May be set to respond as fast as 1 cycle of 50/60Hz
• Better than one degree accuracy
• Voltage monitoring provides independent check of
bus and line conditions
• SCADA control of phase window for emergency
closure of critical ties
• External voltage conditions selectivity
BE1-27 Undervoltage Relay
BE1-59 Overvoltage Relay
BE1-27/59 Under/Overvoltage Relay
(Request bulletin UBF)
Application
Provides reliable protection for generators, motors,
transformers, and other electrical equipment against
adverse system voltage conditions.
Features
• Pickup continuously adjustable over a wide range
• Independent INST and TIME elements
• Individually adjustable timing for each time-delayed
under/overvoltage
• Wide voltage adjustment range (1-40V, 55-160V,
or 110-320V)
BE1-25/79TR Sync-Check Reclosing
Relay (Request bulletin UDW)
Application
Provides voltage monitoring, sync-check, and
automatic reclosing for transmission systems, utility
interties, and distribution systems with cogeneration.
Replaces mechanical repeat cycle schemes,
adaptable for almost any scheme.
Features
• Single or two-shot operation
• Rack mount unit with drawout construction
(19″ x 3.5″ x 8.4″ deep)
• Program settings through front panel display or via
RS-232 or RS-485 communications
• Field configurable through contact inputs
• Delta voltage, phase, and slip frequency monitoring
• Reclose wait function
• Single-phase or three-phase line and bus voltage
monitoring
• Variable 52b response selection
3 BE1 PROTECTIVE DEVICES