difference between Rogowski coil and current transformer

What is the difference between Rogowski coil and current transformer

1. Different nature

(1) Rogowski coil: it is a circular coil uniformly wound on non-ferrous magnetic material.

(2) Current transformer: it is an instrument that converts the large current at the primary side into the small current at the secondary side according to the electromagnetic induction principle.

2. Different structure

(1) Rogowski coil: no ferromagnetic material, no hysteresis effect, almost zero phase error; no magnetic saturation phenomenon, so the measurement range can be from several amperes to hundreds of kiloamperes of current; simple structure, and no direct circuit connection with the measured current; response frequency bandwidth 0.1hz-1mhz.

(2) Current transformer: the current transformer is composed of closed core and winding. Its primary winding turns are very few, which are in series in the circuit of the current to be measured.

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