THE PROTECTION SYSTEM FOR A SHORT DISTANCE TRANSMISSION LINE

摘要

Type of transmission line fault, the account for most of the short-circuit failure, and an earth fault, the protection relay system for relaying these have over-current, the distance relay system, and the direction comparing relaying current differential PCM method. These methods are applied according to the decision of the neutral point for grounding the importance, or ground fault protection of power transmission lines and grid conditions.; The subject innovation is the earth fault during system protection and system separation on positive grid (Kepco / combined heat and power plant) subject to the system protection to maintain an effective grounding principle in the context of driving a 154kV-side neutral point of the power reception transformers in the generator in parallel operation to the direct grounding state to a current differential protection relay within the range using the (DCR differential current relay) and applies a directional overcurrent relay scheme to pick protection.