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Construction Operation & Maintenance

Hydro Power

Regarding TEPCO's hydropower plants in Japan, we have been operating 160 hydropower plants, inclusive of 8 pumped storage type, which cover more than 8,500MW of installed capacity. Also, we have performed engineering services abroad especially in Southeast Asia to date.

In view of engineering technology, we have many and various experience regarding dam, tunnel, underground powerhouse, penstock, headrace, tailrace and so on taking into consideration both of minimum cost and environmentally friendly development.

Our services are not only design and construction supervision but also operation and maintenance with the aim of achieving sustainable development and water efficiency use.

TEPCO also offers suitable engineering services for IPP hydropower projects for planning, design, construction supervision, operation and maintenance.

Service Life Assessment for Hydro Stator Windings
The purpose of the Service Life Assessment method is to evaluate the present Dielectric Strength of Generator Stator Windings in hydroelectric power plants, and to decide the effective measures of accident prevention and the economical maintenance intervals. This method is developed by cooperative research.
It is required unit stoppage for nondestructive performance test.
We continue researching and developing the measurement in operation at present.

The scope of the Service Life Assessment method refers to resin-insulated generators with a rated voltage of 6kV or more. This method is also applied to compound insulation, and to insulation with a rated voltage of less than 6kV.

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Fig. 1 Insulation diagnostic machine

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Fig. 2 In-service partial discharge detection device



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