In order to make an accurate assessment of the risk level of urban distribution network

a risk assessing model of distribution network is established and a risk assessment method is proposed. The risk assessing model of distribution network is created in two aspects of operation risk and grid risk. The operation risk reflects the risk level of the current operation state of the distribution network

while the grid risk reflects the potential risks resulting from the defects of the grid structure. Then the corresponding risk assessing index system of distribution network is set up

and the risk quantized values and risk rating are calculated according to the index values. The comprehensive risk level of distribution network is figured out based on the above calculation results

and the variable weights and logarithm compound method are used in the process of calculation. Finally

a numerical example shows that the proposed risk assessment model is feasible and the risk assessment method is effective. The proposed risk assessment model has successfully been adopted by a power supply bureau.