Abstract: Abstract: The real-time leakage monitoring method and implementation of hybrid load branch are studied. Firstly, a differential compensation method of inherent residual current is proposed through branch load state identification. Using differential compensation, a composite criterion composed of steady-state residual current criterion and residual current increment criterion of hybrid load branch is proposed, which improves the identification sensitivity of branch leakage under different load states. Through the field practice of Jiangsu power grid, it is verified that the proposed method can adapt to the load state change of hybrid load branch, effectively identify leakage faults, and improve the maintenance level of hybrid load branch in self-using power system.

Key words: Key words: hybrid load branch, residual current, differential compensation, leakage current monitoring, intelligent maintenance