Basler Electric BE1-11m - Manual (Page 296)

284 9424200996 Rev L
BC Sensing: ° − ∠ ⋅ =
90 1 V V
AB AN
3
1
° ∠ ⋅ =
30 1 V V
AB BN
3
1
° ∠ ⋅ =
150 1 V V
AB CN
3
1
CA Sensing: ° ∠ ⋅ =
150 1 V V
AB AN
3
1
° − ∠ ⋅ =
90 1 V V
AB BN
3
1
° ∠ ⋅ =
30 1 V V
AB CN
3
1
Using both the measured and calculated PN voltages, watts and vars are then computed using the
equations listed under four-wire sensing type above.
Motor Configuration Settings
The BE1-11m requires information about the power system to provide metering, fault reporting, and
protective relaying.
Power system settings are configured on the Motor Configuration settings screen in BESTCOMSPlus
®. A
summary of the settings appear at the end of this section.
BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Motor Configuration
HMI Navigation Path: Settings Explorer, System Parameters, Motor Configuration
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 and DNP3 analog
event reporting functions.
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/ 3 or 69.3 volts.
Current
The nominal Secondary Phase Current (I
nom
) setting is used by the 60FL function and DNP3 analog event
reporting functions. I
nom
is also used 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.
Motor Setup
The motor configuration settings are used in thermal capacity (49TC) calculations. Values for these
settings can usually be found on the motor data sheet. If the service factor is unknown, keep the default
value of 1.
Configuration BE1-11m