Symbol	Description	SI (\ represents none)
$w_{ij}$	Weight of edge ij	P.U.
$DI{S}_{ij}$	The sum of the edge reactance included in the shortest path from node i to j.	P.U.
$AL$	Average distance of $DI{S}_{ij}$	P.U.
$B{T}_v$	Proportion of weighted shortest paths passing through a node in the network to all weighted shortest paths in the network	\
$B{T}_e$	Proportion of weighted shortest paths passing through an edge in the network to all weighted shortest paths in the network	\
${\delta }_{ij}$	The number of shortest paths between node i and node j.	\
${\delta }_{ij}{}_v$	The number of shortest paths between node i and node j containing node v	\
${\delta }_{ij}{}_e$	the number of shortest paths between node i and node j containing edge e	\
$n_L$	The number of sink nodes	\
$n_G$	The number of source nodes	\
$k_i$	The degree of node i
$AVED$	The average degree of all node degree	\
$L_j$	the load of jth node	MV
${\eta }_L$	The ratio of the load of all normal operation sink nodes in the current power grid to the load of all nodes in the power grid in the initial state	\
$E$	the average of the reciprocal distance between the network nodes of all node pairs in the power grid	\
${\eta }_E$	The ratio between the current network transmission efficiency E and the initial network transmission efficiency $E_0$	\
$L_{in}$	Input energy	MV
$L_{out}$	Output energy	MV
$S_{Rated}{}_i$	Rated load capacity	MV
$S_{Limit}{}_i$	Limited rated load capacity	MV
$a_0$	Rated load capacity coefficient	\
$a_1$	Limited rated load capacity coefficient	\
$wir{e}_{x_i}$	Position of x-coordinate of line i in topological graph	KM
$wir{e}_{yi}$	Position of y-coordinate of line i in topological graph	KM
$E{W}_x$	Position of x-coordinate of the extreme case in topological graph	KM
$E{W}_y$	Position of y-coordinate of the extreme case in topological graph	KM
$r$	Radius of impact range	KM
$\partial$	Coefficient	\
${\lambda }_I$	Failure rate of extreme weather I	\
$a_I$	Coefficient of weather I	\