The current transducer WKO-2C-B with hall effect elements and double-core technology has an extended frequency response up to 120 kHz and an accurate phase response. The WKO-2C-B guarantees an increased current measurement accuracy better than 0.5% in the whole frequency range: DC to 120 kHz.
A completely redesigned electronics ensures that the new C/L current transducer has better drift compensation and an extended temperature range from -40°C to 85°C.
The current transformer has a modular design which allows a variety of mounting options. The cost-effective basic model consists of a housing with screw terminals, bushing for cable and holes for fixing. Optionally, the transducers are available with mounting kit for busbars, molex connectors and feets for horizontal or vertical mounting.
0 … ±1,000
0 … ±1,500
0 … ±3,000
Accuracy and dynamic data
DC .. 120
DC .. 120
DC .. 120
In most applications, C/L current transducers deal with measurements in the range from DC to mains frequencies 120kHz. For this purpose, a standard single core technology hall effect sensor mounted in the air gap is a good solution.
In this design, the hall effect sensor located in the air gap, is used with a bipolar power stage to create an equal and opposite magnetic field in the core. This means that the current output signal is directly proportional to the measurable element on the conductor.
This principle works well for lower frequencies, but as frequencies increase the core inductivity becomes a larger factor and the compensating electronics are not able to function adequately. At this point, the unit acts like a conventional current transformer with poor linearity. This effect is demonstrated in Figure "Electronic and transformer phases are out of tune". This effect and subsequent lack of measurement accuracy are where the REO WKO 2C with double core technology is so important.
REO´s double core frequency response in Figure 4 shows the smooth path between electric and transformer domains.
We have tested other current transducer products and we can safely say that only a few of them have acceptable smooth frequency transition performance as shown in Figure "Comparison WKO-2C 500 and competitors products" below.