1. Merit of compactness

• Reduction of construction cost
• Reduction of environmental impact
• Creation of new space
• Smoothly promotion of construction plan

2. Compactness design technology of TEPCO
(1) Downsizing of equipment

• Finding and design concerning insulation performance and cooling performance of equipment
• Achievement of compact by specification rationalization, and the technological experience to set proper margin

• "Transition of equipment space"
  • 500kV Transformer
        100%(1975) 55%(present)
  • 500kV Transformer
        100%(1980) 25%(present)

(2) Arrangement design rationalization

• Effective arrangement design of auxiliary devices of equipment, and arrangement design examination know-how
• Earthquake-proof design and foundation design
• Civil design, building design, and construction which minimizes substation site area
• Effective hierarchical arrangement design of constructing at narrow-minded site and underground
• Arrangement design that considers operation, maintainability, and adaptability for future expansion

• "Example of underground substation"
  The equipment and the switchboard are arranged
  in the same room.

TEPCO has abundant experiences of substation design of in-door type and underground type

Our Experience

Title:	Assistance on 500kV Underground Transmission and Substation Technologies
Client:	Shanghai Municipal Electric Power Company, China
Term:	September 2005 – March 2007
Outline:	Engineering design and technical assistance in order to build 500kV high voltage underground transmission lines and substation, planned in Shanghai new development area by making best use of TEPCO’s abundant experiences in the underground high voltage transmission technologies.