Basler BE1-25A Instruction Manual - Functional Description
BE1-25A
FUNCTIONAL DESCRIPTION
The BE1-25A is contained in a standard, 19-inch, rack-
mount case with all controls and indicators visible
through the front cover and accessible by removing the
front cover. The active circuits are contained within
plug-in modules.
The primary control module (called the MCU Sync
module) is essentially a dedicated computer that
monitors the voltage on both sides of the breaker to be
closed, calculates the slip frequency, and then (taking
into consideration the defined operating speed of the
breaker) calculates the angle at which to initiate “ideal”
closing. The “ideal” closing is one that minimizes
electrical and mechanical transients.
Since the “ideal” closing occurs when the voltages are
in phase, the initiating signal must be delivered ahead
of phase coincidence by a factor termed the advanced
angle.
The closure will occur only if the slip frequency is less
than the limit established by the maximum slip setting.
After the breaker close contact has been closed (and if
the lockout feature is enabled) the unit will go into
lockout if the breaker reopens within 15 seconds. This is
to prevent repeatedly closing the breaker into a fault.
If lockout occurs, the BE1-25A is inhibited from further
operation until reset. Reset may be done via a front
panel switch, an input contact, or will occur automati-
cally if the breaker is closed by other means and
remains closed for 15 seconds.
The test module (shown in Figure 2), when inserted into
the case in the operate position, allows selected param-
eters to be monitored while the unit is in normal service.
When moved to the test position, the unit is isolated
from its operational environment for test or calibration
purposes. In this position, test signals may be applied
to the unit through the convenient pin jacks on the front
panel.
4
Figure 2 - Front Panel
FRONT PANEL INDICATORS
5-Digit LED Display
The variables that may be displayed are:
•
Bus/generator phase angle difference
•
Bus voltage
•
Generator voltage
•
Advance closing angle
•
Identification number of the breaker selected
Settable parameters with F0 option:
•
Up to six breaker closing times
•
Maximum allowable slip rate
•
Generator undervoltage
•
Lockout ON/OFF
Settable parameters with F5 option:
Each generator/breaker selection (1 through 6) has a
configurable menu of parameters as shown below:
•
Breaker closing time
•
Speed correction pulse width
•
Speed correction pulse interval
•
Maximum allowable slip rate
•
Generator undervoltage
•
Lockout ON/OFF
Lockout Indicator: Illuminates to indicate the synchro-
nizer is locked out. The lockout condition is the result of
a trip of the generator breaker within 15 seconds of
closure by the synchronizer.