Power System Settings - Basler BE1-11g Instruction Manual

366 9424200994 Rev U

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-, 60-, or 100-hertz power systems.
Phase Voltage
The nominal Secondary Phase Voltage setting is used by the 24, 25, 60FL, and 67 elements. The
nominal secondary phase voltage 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, the nominal secondary phase voltage 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, the nominal secondary phase voltage must be set at 120/ or 69.3 volts.
3
Auxiliary Voltage
The nominal Secondary Auxiliary Voltage setting is used by the 25 element. The nominal secondary
auxiliary voltage is defined as the secondary phase-phase or phase-neutral voltage as defined by the Aux
VT Connection setting on the Sensing Transformers screen in BESTCOMSPlus.
Current
The nominal Secondary Phase Current (I ) setting is used by the 60FL function, directional calculations
nom
for the 67 elements, and DNP3 analog event reporting functions. I is also used in the volts/hertz (24)
nom
calculation and in the 46 time curve calculation (K factor) of the negative-sequence current (51-x)
element.
I is the nominal phase current rating for the system corresponding to 1 pu current and is configured in
nom
secondary amps. If 1 pu secondary current is unknown, then setting I to the secondary CT rating (1 or
nom
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 is used to directly compute multiple of
nom
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
Configuration BE1-11g