With the widespread integration of distributed generators

distribution network is altered from simple radial network to multi-terminal active network. This shift has caused a decline in the performance of traditional relay protection methods in distribution network. Consequently

current differential protection is being increasingly adopt- ed in distribution network. However

the characteristics of distribution network

such as multi-source

multi-load branches

and bidirectional power flow

leads to decreased adaptability of traditional current differential protection. To address these problems

this paper analyzes the fault current characteristics of various types of distributed generators and explains the reasons for the decline in adaptability of traditional current differential protection. Based on the amplitude and phase of the current on both sides

the sensitivity compensation coefficient is introduced to enhance sensitivity of protection. Additionally

considering the non-ideal conditions such as CT saturation an anti-interference coefficient based on Hausdorff distance is introduced to improve security of protection. By setting the parameters of these two coefficients appropriately

the performance of current differential protection is enhanced. Based on PSCAD/EMTDC it is demonstrated that the proposed protection can offer superior sensitivity and security compared to traditional differential current protection.