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.
Circuit Breaker Operation - Timing Monitoring
Functional Inspection for Circuit Breakers by Monitoring the Control Circuit
Current
A Monitoring Test and Test Equipments
The Aim and Effect of this Diagnosis
- Inspection for Switching Linkages & Control Circuits in CB
- To Check the Condition of CB Functions for more Reliability
- Only by Monitoring the Lag between the Control Current and the Contact
Currents
- No Planned Stoppage is needed.
