1. Objective and Overview of Sub-transmission Network Models

Japan’s sub-transmission network system (77 and 66 kV) has been modeled. These three main types of models are described as bellows;

• Documents 
• Fig. 2.1 
• Fig. 2.2 
• Fig. 2.6 
• Fig. 2.7 
• Fig. 2.9 
• Table 2.4 
• Table 2.5 

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• System I: 77 kV Overhead transmission systems (overhead line systems)
  Model I: 77 kV Provincial system mode
• System II: 77 kV Cable transmission systems (cable systems)
  Model II: 77 kV Metropolitan system model
• System III: 66 kV Mixed overhead line and cable systems (mixed overhead-cable systems)
  Model III : 66 kV Suburban system model