Basler Electric BE1-11g - Manual (Page 19)

9424200994 Rev N 7
Power (32) Protection
Two directional power elements are included in the BE1-11m and can be set for forward or reverse,
overpower or underpower protection. The element can be used for any application requiring directional
power flow detection including intertie protection (interconnects between an electric utility and a source of
non-utility generation). The power measurement algorithm is adapted as appropriate for any possible
three-phase or single-phase voltage transformer connection. Directional power is calibrated on a three-
phase basis regardless of the voltage transformer connection used. Directional Power Protection can be
set for one of three, two of three, three of three, or total power.
Note
BE1-11g protection systems enabled for IEC-61850 communication
(style Gxxxx5xxxxxxxx) have their power protection elements fixed at
one underpower element and one overpower element.
Loss of Excitation - Reverse Var Based (40Q) Protection
One loss of excitation element monitors three-phase reactive power (vars) to determine when a loss of
field condition exists.
Loss of Excitation - Impedance Based (40Z) Protection
One loss of excitation element implements a two zone offset mho characteristic to protect against varying
load conditions.
Distance (21) Protection
Two distance protection elements provide backup protection for external faults that are not cleared by
external protective relaying due to a failure of the external system protection scheme or equipment.
Settings are provided to configure a zone of reach using a mho circle.
Out of Step (78OOS) Protection
When a generator loses synchronism, high peak currents and off-frequency operation can cause winding
stress, high rotor iron currents, pulsating torques, and mechanical resonances that may be damaging to
the machine. The out of step element monitors the generator or step-up transformer terminals and detects
an out-of-step condition based on the rate of impedance change.
Resistance Temperature Detector (49RTD) Protection
Fourteen resistance temperature detector elements provide over/undertemperature protection in
applications where a remote RTD module is connected to the BE1-11g via Ethernet or RS-485 cable. For
more information, refer to the
RTD Module chapter.
Analog Input Protection
Eight analog input protection elements monitor external analog input signals when two remote RTD
modules are connected via an Ethernet or RS-485 cable. Four analog inputs are provided with each RTD
module. For more information, refer to the
RTD Module chapter.
Fuse Loss (60FL)
A fuse loss element protects against false tripping due to a loss of voltage sensing. Voltage transformer
circuit monitoring adds security by detecting problems in the voltage transformer sensing circuits and
preventing mis-operations of the 25, 27P, 47, 59P, and 51/27 functions.
Auto Synchronizer (25A) (style GxxxxxxxSxxxxx or GxxxxxxxTxxxxx)
An auto synchronizer element synchronizes a generator to a bus by matching the voltage, frequency, and
phase angle. Modes are provided for Phase Lock Loop or Anticipatory operation.
BE1-11g Introduction