Rogowski coils and current transformers are often compared in the same selection table, but the first question is the signal: does the current contain a DC component that must be retained?
The DC component
If the goal is total battery charge or discharge current, the DC component is part of the result. Conventional Rogowski coils and AC current transformers cannot provide a complete measurement. Consider a zero-flux sensor or a current shunt, and check range and long-term stability.
Frequency and transients
A Rogowski coil’s flexible structure suits confined measuring points, and its bandwidth and transient response are advantages. A current transformer must be checked against peak current, RMS current and current-time product limits. Neither should be chosen by maximum bandwidth alone.
Installation and structure
A through-hole transformer needs the conductor to pass through its window, while a Rogowski coil must close around the conductor. Installation space, conductor shape and fixing method affect practical use, so include structural conditions in the selection.
Confirm what the signal contains, then which structure can be installed, and only then compare detailed specifications. Reversing that order can produce a plausible but unusable choice.
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