PD	Partial discharge
UHF	Ultrahigh frequency
HV	High voltage
WT	Wavelet transform
SNR	Signal noise ratio
MTFM	Module time-frequency matrix
FCM	Fuzzy c-means
SMMV	Sub-matrix maximum module value method
SVD	Singular value decomposition
PRPD	Phase resolved partial discharge
CPU	Central processing unit
RAM	Random access memory
RMSE	Root mean square error
NCC	Normalized correlation coefficient
VTP	Variation trend parameter
RVTP	Rise variation trend parameter
FVTP	Fall variation trend parameter
NRR	Noise reduction ratio
ARR	Amplitude reduction ratio