Radian RD-30 - Voltage and Current Inputs

RD-30 Operations Manual
Operations Overview
18
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 elds 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 sufcient 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.
* Appendix: RD Current Connector Locking Mechanism...... page 66