Auxiliary Power Inputs; Voltage And Current Inputs* 1 - Radian RD-30 Operation Manual

Operations Overview
4.4 Voltage and Current Inputs*
The voltage and current inputs are completely autoranging – a design feature that was pioneered
by Radian Research with the RM-10 in 1985. The voltage and current inputs consist of a toroidal
autoranging electronically compensated transformer. The Radian toroid transformer provides
superior immunity to stray fields and the electronic compensation eliminates practically all of the
transformer error.
4.5 Auxiliary Power Inputs
Auxiliary power is required to power the internal workings of the RD-30. It may be derived from
the same signal as the potential input providing that there are sufficient volt-amperes available.
Auxiliary power may also be supplied independent from the potential input source. The power
supply for the RD-30 is a very advanced switching power supply which is inherently capable of
converting the available input power to regulated power over the entire operating range. The con-
verter is so effective at this that the input may be changed freely between the ranges of 60 and 630
VAC during operation without a measurable effect upon operation.
The connections have been updated to an insulated socket design. The Potential Input and Aux-
iliary Power Input are 4mm connections and the Current Inputs are 6mm connections (bolt-on
design for 200 amp models). It is now virtually impossible to touch any live connection while the
unit is in operation.
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* Appendix: RD Current Connector Locking Mechanism...... page 66
RD-30 Operations Manual