Split-Phase - Basler BE1-11g Instruction Manual

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Split-Phase

In a self-balancing arrangement, the phase and neutral side of each phase of the winding route through a
CT so the net flux is zero under normal conditions. See Figure 81. Typically, a three-phase Instantaneous
Overcurrent (50) element provides self-balancing protection.
Figure 81. Self-Balancing Connections
If a BE1-11g is equipped with the differential option (style G6xxxxJxPxxxxx or G6xxxxJxTxxxxx), an
alternate method can be used to configure self-balancing protection. In the Phase Differential (87) window
of BESTCOMSPlus, set the mode to Flux Balance. In this mode, the BE1-11g compares the setting in the
Flux Balance Pickup setting (secondary A) on a per-phase basis to the current in CT circuit 1 (CT1). The
link between CT1 and the Flux Balance mode is fixed in firmware; the flux balance circuit must be wired to
CT circuit 1 (terminals D1 through D8 in Figure 81). The "Flux Balance" mode is equivalent to a three-
phase 50 element. Ignore the Transient Monitor settings when configuring the differential element for Flux
Balance mode.
Phase Differential Protection: Self-Balancing and Split-Phase Configurations (50/51) BE1-11g