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Electrical installation costs


As previoulsy stated, besides reducing electric power consumption, an effi cient electrical installation reduces its costs of operation. For a better understanding, each one of these costs is explained in detail hereafter:

Technical costs

What are they
Technical costs are understood to be the loss of capacity in transporation and distribution, as well as heating (electrical losses), disturbances and voltage drops in the electrical installations and systems.

What are they caused by
The following causes are responsible for this technical saturation in the electrical installations:

  • Peaks of maximum demand
  • Existence of reactive power
  • Existence of harmonic currents
  • Lines with unbalanced loads
  • Use of non effi cient receivers

How are they reduced
Technical costs are reduced as follows:

  • Reactive energy compensation
  • Harmonic fi ltering
  • Phases balancing
  • Damping peaks of maximum demand and relocating these consumptions in valley periods

Which are the benefi ts of improving technical costs

  • Less energy consumption
  • Improved effi ciency in the electric installations by better taking advantage of the distribution lines and transformers
  • Decreasing of losses and heating in lines and equipment
  • Decreasing of number of breakdowns
  • Continuity of electrical service
  • Decreasing of the economical costs

Economical costs

What are they
These are the costs of a bill that is not optimized and the amount resulting from the technical costs generated. They can be classifi ed as follows:

  • Visible costs
  • Hidden costs

1- Visible costs

These are the costs included in the electricity bill:

    • Power contracted not appropriate
    • Electricity tariff not appropriate
    • Hourly energy consumption
    • Demand peaks
    • Reactive energy consumption

How are they reduced
By studying the electricity bill, the actions needed to reduce the global cost can be defi ned.

      • Adjust the contracted power and change the tariff if necessary. This can be done at almost no cost. Nonetheless, before adjusting the contracted power or tariff, it is recommended to study the processes and the power consumption to see if the demand is adjusted to the real needs
      • Eliminating extra charge or cost of reactive energy by its compensation. To do this, a capacitor bank is installed, which in most cases pays for itself within a few months after installation
      • Damping the peaks of maximum demand. This consists of not exceeding the maximum allowable power permitted by the utility, and when possible, relocating loads when the energy demand is reduced

2- Hidden costs

What are they
- All unnecessary energy consumption. So, the costs due to unnecessary power and energy consumptions or due to can be dispensable certain time
- All the costs origined as a consequence of the technical costs and the use of receivers that can generate disturbances. Although they are not obvious, they can represent a signifi cant company expense. These are divided into two types:

      • Electrical installation costs
        • Extension of the electrical installations due to:
          • Overload of distribution lines
          • Overload of transformers
        • Losses in distribution due to the Joule effect. This concept is especially important in electric distribution and in industrial plants with long distance lines
        • Machine breakdowns (motors, transformers, converters, etc.) and control equipment (computers, PLCs)
      • Costs in productive processes
        • Installation stoppages
        • Non-finished product losses
        • Additional costs in extra working time and manpower

How are they reduced

    • By performing an effi ciency study of the building or industrial plant.
    • By correcting the technical costs explained in the previous point.

Which are the benefits of improving visible and hidden economical costs

  • Reduced energy consumption
  • Decrease of the electricity bill
  • No need to invest in the extension of installations due to the lack of capacity
  • Productivity improving by reducing the number of breakdowns and stoppages

Ecological costs

What are they
CO2 emissions produced by the consumption of unnecessary energy.
To give an idea of its magnitude, 1 MW·h generated by fossil fuels emits 1 ton of CO2. If considering mixed electric energy generated by fossil fules and renewable energy sources, the ratio is approximately 0.6 tons of CO2 per MW·h.

How are they reduced
By making a general proposal to reduce global energy consumption in an industrial plant or building. So that, an initial diagnosis is required to determine the following points:

  • Energy consumption habits
  • Current condition of the installation
  • Installation of equipment that permits controlling and monitoring the energy consumption in the electric installations
  • Energy consumption in each plant or working area
  • The energy consumption that can be reduced
  • The receivers that can be replaced by effi cient ones

Which are the benefits of improving ecological costs

  • Reduction of the emissions of greenhouse effect
  • Decrease of technical and economical costs


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t. (+34) 93 745 29 00
 

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Contact

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Vial Sant Jordi s/n, 08232
Viladecavalls (Barcelona) Spain
Tel: (+34) 93 745 29 00
Fax (+34) 93 745 29 14

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