using an appropriately scaled
25. 50. 75. or 100-millivolt nominal metering shunt. DC voltages are sensed
by direct connection for nominal levels up to 1.500 Vdc. The BE1-11d can
utilize two IT-D modules to sense a single dc current and up to three dc
voltages.
The IT-D digitally samples the sensed inputs at a rate proportional to the
rectification system nominal power input frequency. The sampling rate is
established to maintain a high accuracy of the measurement for a dc signal
with ripple content.
High-speed fiber optic communications between the IT-Ds and the BE1-11d
transmit the magnitudes of the system measurement to the protection system.
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