复杂电磁环境对中压配电网安自装置的影响研究OA

The complex electromagnetic environment around the dense power transmission channels is prone to generate induced electricity in the adjacent medium-voltage distribution network,which affects the operation logic of the security automatic equipment in medium-voltage distribution networks and reduces the power supply reliability.To this end,the paper makes studies on the impact of complex electromagnetic environments on the safety automation devices of medium-voltage distribution networks.Firstly,the paper uses the phase-mode transformation of multi-conductor systems to derive the inductive mechanism of induced electricity,then employs the electromagnetic transient simulation software ATP-EMTP to calculate the distribution law of induced electricity in medium-voltage distribution lines under different fault types,and finally combines with the operation logic of recloser and Automatic Alternative Transfer(AAT)to analyze the influence of induced electricity on security automatic equipment.The research results show that metallic grounding faults are less likely to cause the security automatic equipment to fail to operate,while interphase(non-grounding)faults and grounding faults through resistance are more likely to cause the security automatic equipment to fail to operate.In addition,the paper proposes anti-error strategies for security automatic equipment from three aspects:protection of action parameter value setting,protection of functional configuration and line planning and design,thus providing new ideas for improving power supply reliability.