Raptor
58
Rogowski CT
Current Sensors or Transducers, based on the so-called
Rogowski coil principle, are being used more and more
frequently today. They are combined with electronics that
condition their output, thus presenting a greater advantage
over the traditional induction CT, in terms of the total
absence of saturation, as they have no magnetic core.
Furthermore, they have secondary voltage, presenting a
ratio that is generally defined as xxx A/ yyy mV or it can
also be frequently seen as xxx mV per Ampere.
The measurement inputs of the devices that use this
technology have high impedance as what they have to
measure is voltage, and their burden is irrelevant. Thus, in general terms, there is no
need to measure it.
Otherwise, it behaves exactly the same as an induction CT, insofar as its ratio precision
and polarity are concerned, and these are the two most important parameters to be
measured, which is what the template does.
Template configuration:
The template is configured as follows:
• Generator: Pass-through turn
• Time display: As timer in seconds (8 s, maximum length of high current
injection)
• V1in input secondary voltage meter in Volts. Auto Mode (voltage in
secondary of Sensor).
• Phase angle meter between voltage V1in and primary current Io. (Polarity
and angle error of Sensor).
Connections:
Connect the output of the pass-through
turn to each side of the Primary of the
Rogowski sensor (or pass the cable
through the center space, where
appropriate). The indication of the
direction of the polarity is inconsistent,
but it is often similar to the classic CTs.
In general, when you connect the
primary to the pass-through turn and
the secondary to be measured in the
voltage measurement input V1 of the
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