346 9424200994 Rev N
Power System Settings
The BE1-11g requires information about the power system to provide metering, fault reporting, fault
location, and protective relaying.
Power system settings are configured on the Power System settings screen in BESTCOMSPlus®. A
summary of the settings appear at the end of this section.
BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Power System
HMI Navigation Path: Settings Explorer, System Parameters, Power System
Nominal Settings
Frequency
Nominal Frequency can be set for 25-, 50-, or 60-hertz power systems.
Voltage
The nominal Secondary Phase Voltage (V
nom
) setting is used by the 60FL function, directional calculations
for the 67 elements, and DNP3 analog event reporting functions. This setting is also used in the
volts/hertz (24) calculation.
V
nom
is defined as the secondary phase-neutral voltage for all sensing connections. That is, even if the
user has selected 3-wire, AB, BC, or CA phase-phase sensing connections, V
nom
must be set for the
phase-neutral equivalent. For example, if a 3-wire open delta voltage source with a phase-phase voltage
rating of 120 volts is connected, V
nom
must be set at 120/
or 69.3 volts.
Current
The nominal Secondary Phase Current (I
nom
) setting is used by the 60FL function, directional calculations
for the 67 elements, and DNP3 analog event reporting functions. I
nom
is also used in the volts/hertz (24)
calculation and in the 46 time curve calculation (K factor) of the negative-sequence current (51-x)
element.
I
nom
is the nominal phase current rating for the system corresponding to 1 pu current and is configured in
secondary amps. If 1 pu secondary current is unknown, then setting I
nom
to the secondary CT rating (1 or 5
A) is acceptable for most applications. However, this could degrade the expectation (not accuracy) of the
time curve for the 51-x negative-sequence element as I
nom
is used to directly compute multiple of pickup
(MOP) and time delay.
Power Polarity
This setting defines the polarity of metered watts and vars.
Phase Rotation Setup
Normal phase rotation can be set for either ABC rotation or ACB rotation.
Power Line Parameters
Power line parameters are used for fault location and distance to fault. For more information on distance
to fault and the power line parameters, see the Fault Reporting chapter.
Maximum Torque Angle
Maximum Torque Angle (MTA) is used by the directional overcurrent (67) element to provide directional
supervision of the overcurrent tripping elements. The MTA for the phase and ground polarizing elements
is normally derived from the line impedance angles (power line parameters) but there are applications
requiring MTA's different from the line impedance angles. For more information on setting MTA for
different applications, see the Directional Overcurrent (67) Protection chapter.
Configuration BE1-11g
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