Renewable Energy Solutions in Sierra Leone
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Electricity Grid development

Design, engineering, construction and maintenance of electricity grids

German Energy offers you services for the design, project planning, construction and maintenance of power grids, which are partly carried out by our own specialists or by cooperation partners.

This includes the following services:

  • Preparation and preliminary project inspection of energy plants, their technical condition, operating conditions;
  • Obtaining technical specifications for the construction, reconstruction and technical reequipment of power supply systems;
  • Consulting and technical support of the customer in questions of interaction with power supply companies;
  • Design, construction, reconstruction and technical reequipment of power supply systems and power supply of objects of various purposes;
  • Calculation of parameters of electric networks with voltage 0,4÷35 kV;
  • Conclusion on the possibility of passing on additional electric capacity;
  • Design of systems of commercial measurement of electric energy and reserve power supply;
  • Carrying out of nongovernmental expertise of design solutions;


The dimensioning of overhead power lines

The planning of overhead lines begins with a survey of the terrain on which the line will run. A route selection law is then drawn up, which goes through the approval procedure with the responsible municipal authorities, the geodetic and engineering analysis and the topographical plan showing all buildings and utilities.

The project is carried out in 3 successive phases:

  • The preliminary examination stage, or preliminary design stage, is necessary to obtain and analyse data and to study all the solutions and options, taking into account the location of the underground lines.
  • Project phase provides design of objects and electrical lines. In this phase calculations and drawings are made, budget/calculation documentation is prepared.
  • Coordination phase the final phase, which consists in project approval by the professional organizations. It is the most important and labour-intensive part of the project, including the implementation of the project documentation review.


Design of power transmission lines

The project of cable lines is carried out similarly as the project of overhead lines - it begins with surveying of the area on which the designed line will run, then the action of selection of a route is carried out, which is a coordination procedure in corresponding municipal authorities, then the geodetic analysis is carried out and the engineering topographical plan with instructions of all constructions and engineering communications is made.

The works are carried out in three successive stages:

  • Preliminary design review.
  • Development of construction and calculation documentation.
  • Coordination of the project decisions with the owners of the territories and engineering communications, which the cable route crosses or into which the safety zones enter.

Further information on the design features of power transmission lines

Designing of power lines is one of the most important stages of construction of the future electric network, on which all the basic technical and economic characteristics of the designed line are placed in the course of obtaining information and carrying out the necessary calculations according to the operational specifications and technical documentation.

What works are carried out during the construction of the project

Before starting work on designing overhead power lines, the employees of the designing organization will provisionally define with the customer the line on which the line will run (its proximity to inhabited areas, the presence of railways, motorways, communication objects, vegetation, etc.).

The next stage of the design of overhead lines is the preliminary design survey, during which the engineers collect all necessary information for the work.

The obtained information is analyzed and systematized, and an application for technical specifications for the construction of overhead lines is prepared. After the technical specifications are issued, the specifications for the design of overhead lines with a certain maximum permissible power (kW) are prepared.

The next stage of works after designing of overhead lines is the development of design documentation, which, based on confirmed norms of construction and technical rules and standards, takes into account many factors:

  • the length and direction of the future line of power transmission;
  •  voltage for which the transmission line is designed;
  • crosssection of wires used during construction and installation works;
  • type of wires (noninsulated, self-supporting, insulated)
  • the type of supports and accessories,
  • the fittings and fixings required,
  • the electrical safety of the consumers and the ease of connection to the electricity grid

The project documentation approved by the Customer and agreed with the power supply company must be specified during the assembly phase when preparing the work documentation for which the construction and assembly works are to be carried out.

After all the necessary works provided for in the project have been carried out, commissioning is carried out with the necessary documentary support.

Engineering and calculation of transformer stations

Transformer stations - power engineering equipment needed for the power supply of equipment for various purposes. They serve both as receivers and as distributors of electrical energy. Transformer stations are subject to increased requirements for electrical safety and reliability of power supply to the equipment. The serviceability of the expensive equipment depends on how correctly the protection and automation in the substation itself, competently selected switching and distribution equipment, is set up. Therefore, the importance of planning substations can hardly be overestimated.

The design is carried out taking into account the characteristics and future modernization of the designed object.

The stages of designing of transformer stations:

  • Developing/preparing the specification.
  • Collection and analysis of the existing substation (if any) and collection of comprehensive basic data.
  • Development of the design and working documentation.
  • Coordination of the design documents.
  • Examination of the project and preparation of the construction documents.
  • Handing over the finished documentation to the customer.

After coordinating the task with the customer, we can select a suitable type of substation and all work is carried out in compliance with the agreed deadlines and the provision of the necessary documentation.

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