Inspec keywords: UHF detectors; gas insulated switchgear; Fourier transforms; UHF measurement; support vector machines; time-frequency analysis; signal classification; partial discharge measurement; feature extraction; signal detection

Other keywords: Time–frequency analysis; UHF signal classification; PD-induced UHF signal detection; PD pattern classification; Hu invariant moment; feature extraction; internal UHF sensor; propagation characteristics analysis; L-shaped GIS; energy density distribution extraction; PD-induced UHF signal acquisition; support vector machine classifier; short-time Fourier transform method; voltage 252 kV; UHF signal processing; partial discharge detection; gas-insulated switchgear; ultrahigh-frequency method

Subjects: Microwave measurement techniques; Integral transforms; Signal detection; Microwave circuits and devices; Dielectric breakdown and discharges; Charge measurement; Sensing devices and transducers; Switchgear