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TEPCO has accomplished stable and reliable power system to achieve high quality power supply. To realize the well-balance performance, TEPCO improves protection performance, develops various protection systems and uses appropriate controller etc.

Transmission Network
Electric Energy Storage

Transmission Network

Distribution Systems Protection Scheme (System Operation) Improvement in Protection Relay Performance
If a protection relay fails to properly operate, a cascading failure followed by a large-scale outage is expected. It is essential that, the actual operation of the existing protection relay be constantly reviewed, including the validity of the relay setting. In addition to this, computation analyses and surveys on operation of the protection relay during the potential disturbance are to be conducted for the current and future system in order to prevent a malfunction. TEPCO has a wealth of experience in operation practices regarding the reviewing of work, relay operation analysis and setting coordination, etc.

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