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Corporate Information

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Construction Operation & Maintenance

Substation

TEPCO have 1577 substations in 2005. We have built a variety of substations depending on their purpose, supplying voltage, installing cost, and its supplying area. 500kV large-scale underground type substation has been built for stable and efficient supply for Tokyo metropolitan area.
Even though we operate a variety of substations and machineries, We have achieved very low annual average electricity interrupting time. For stable supply, we have introduced many up-to-date techniques. And we have organized quality management system for substation design and construction (e.g. Guidelines for installation of SF6 Gas Insulated Switchgears.). And we have developed effective diagnostic/maintenance techniques for every machinery (e.g. dissolved gas analysis and circuit breaker operation monitoring are employed).
We can offer the best solutions for substation construction/operation from our technical experience. Fault Restoration System
Control system can isolate internal and external faults of distribution substations, and restore power supply automatically as much as possible.

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Expected Effects
  1. Quickness - Power system can be restored automatically.
  2. Reliability - Automatic control system can perform restoration certainly.
  3. Labor Saving - Fault restoration can be conducted without human operations.


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