GIL	Gas-insulated transmission lines
XGBoost	Extreme gradient boosting
PD	Partial discharge
UHF	Ultra-high-frequency
TDoA	Time-difference-of-arrival
CCF	Cross-correlation function
ME	Minimum energy
TV	Threshold value
RSS	Received signal strength
PDIV	PD inception voltage
CEEMD	Complementary ensemble empirical mode decomposition
WOA-ELM	Whale optimization extreme learning machine
PCA	Principal component analysis
SVM	Support vector machine
SOA	Seagull optimization algorithm
DAS	Distributed acoustic sensing
AE	Acoustic emission
PC	Personal computer
GBDT	Gradient boosting decision tree
FFT	Fast Fourier transform
MDE	Mean distance error
SNR	Signal-to-noise ratio