Supervision of Transmission Network Withdrawal

Transmission Planning

Transmission projects are divided according to the voltage supplied, known as SUTR (low voltage overhead line, 20 kV), SUTM (medium voltage overhead line, 70 kV), SUTT (high voltage overhead line, 150 kV) and SUTET (extra high voltage overhead line, 500 kV).

Project Activity Stages

Activities in electricity project implementation include feasibility study, design, specification preparation, tender document preparation, procurement, bid evaluation, contract negotiation, contract preparation, contract execution and supervision, commissioning, handover, warranty period and commercial operation.

Definition of Feasibility Study

The meaning of feasibility study is to assess the feasibility of a project in relation to the likely success rate of the objectives to be achieved. If the idea is an investment in the construction of a project in the form of a new facility/installation, then assessing its feasibility requires a series of activities ranging from developing, analysing and screening the initiative or idea that arises to exploring various aspects of the project and the resulting business unit. The idea may also be a response to a situation caused by the need to upgrade existing facilities, such as repairing or replacing old equipment to improve efficiency and reduce maintenance costs. Thus, production costs can be reduced and competitiveness can be increased.

Preparation of Feasibility Study of Project of Electricity Facilities in RUPTL, Feasibility Study of Project Plan of Electricity Facilities must at least contain:

• Name
• Location
• Background & Objectives
• Estimated Cost & Funding Source
• Alternative Solutions
• Existing Option
• Solutions that fulfil Max B/C Ratio or Least Cost
• Operational Feasibility study (OFS)
• Financial Feasibility study (FFS)

The Feasibility of Operation (FOC) Study consists of, among others:

• Current qualitative and/or quantitative condition
• Qualitative and/or quantitative conditions to be achieved
• Scope of Work & Programme Implementation
• Assumptions used A.I:
  • Demand forecast
  • Power balance
  • Implementation schedule & operation plan
• Load flow analysis
• Short circuit analysis
• System stability analysis
• System realiability analysis
• Geographical map and single diagram
• Environmental impact analysis
• Possible impacts
• Impact control

Selection of Generation Centre Location

• Load Centre Location
• Existing power grid, power const & comm
• Ease of connection to existing substation and availability of “row”
• Availability of fuel: type, price and its characteristics
• Land status (protected forest, conservation forest) availability of land, settlements
• Land condition: soil, topography, geology, hydro-oceanography, bathymetry, etc
• Water availability: cooling system, “make up” and for consumption
• Accessibility: equipment and fuel transport
• Social and environmental conditions

Scope of study of electrical systems

• Power & energy balance analysis: to identify supply and demand in the system for a period of time.
• Electricity system load curve identification.
• Electricity system development planning (generation, transmission & GI)
• System analysis:
  • Power flow analysis
  • Short circuit analysis
  • Stability analysis
  • Contingency analysis
• Reliability analysis