The HFCT-20 and HFCT-60 are high frequency current transformer sensors designed for partial discharge detection on electric apparatus’ ground returns. Made from superior quality materials, they are made to last in any environment. The HFCT clamps are intended to be used with the AE-150 for partial discharge localisation, or with the XDP-II (or XDP-II-LT) for quick partial discharge detection and analysis.