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  • Energy Efficiency
  • Green Buildings - Reactive Power Compensation

      LEGRAND Electrical Pannels Tableau électrique Legrand

    Green building – Green installations

    LEGRAND General matters concerning Electrical Panels

    Electrical panels can improve energy performance in a home and thereby contribute to sustainable development and the green building approach. In light of its weight in energy consumption, building energy use is a major concern. Innovative solutions now exist to compensate reactive energy and measure building consumption.

    The innovative offers brought out by the Legrand group concern the whole electrical panel. Everything from the installation head, to custom equipment boxes is available. As the electrical panel is the core of the electrical installation, it is logical that it is active in the deployment of solutions that aim to support sustainable development.

    LEGRAND Reactive power compensation systems - technical_room_5.jpg

    LEGRAND Reactive power compensation

    Reactive power compensation systems optimise electrical installation performance. Legrand capacitor banks help reduce energy consumption and improve the power factor of an installation, while extending its service life.

    Reactive power causes more energy to be consumed and in the end contributes to increasing CO2 emissions into the atmosphere and to more costly electricity bills. Under the yellow rate, reactive power is taken into account on an all-inclusive basis in the apparent subscribed rating, which increases the cost of electricity. The aim of compensation is to improve the power factor of an installation. It consists of setting up capacitor banks which are a source of reactive energy. So the power capacitor banks reduce the quantity of reactive energy supplied by the source. It is an eco-efficient solution that can make an immediate contribution to reaching the objectives set by the Grenelle Environment round table.
    The conservation of natural resources and enhanced energy efficiency are the fundamental objectives of sustainable development and green building policies. Reactive power compensation can increase the energy efficiency of an installation. It is then possible to achieve a situation where only the active (useful) energy is carried, both on transport and distribution networks, and in customer networks. The use of reactive energy compensation equipment is a major source of savings. Such equipment enables an immediate and significant reduction in energy consumption and CO2 emissions.

    The capacitor banks provide the reactive energy necessary for certain equipment to work (ballast, motors, etc.). They enable consumers to subscribe to a less expensive power supply contract with the utility supplier. Low Voltage and High Voltage capacitor banks are designed and sold by the Legrand group in France and around the world. They make a significant contribution to sustainable development.

    These capacitors compensate the installation’s reactive energy while reducing energy bills. In effect, they reduce the apparent power required by the installation by around 20%. This can avoid the replacement of a substation that has reached its power capacity or to settle for a subscription that is limited by technical conditions (many subscribers on a single transformer). Capacitors are used in industrial buildings and large commercial buildings. With the same subscription, they can eliminate the reactive energy bill, optimise the subscription and increase the installation yield. In a 1000 m² supermarket, savings can reach €1128 per year. The savings in CO2 amount to 1.6 tonnes a year and the cost is amortised in just 2 years.

    LEGRAND Measurement and monitoring - technical_room_3.jpg

    LEGRAND Measurement of energy consumption

    Measurement provides direct access to information concerning consumption. By implementing corrective actions, energy expenditure can be reduced. The intelligent central readout stations and power meter protection devices integrated in the main LV distribution board enable power consumption to be monitored and analysed.

    Measuring one’s electricity consumption, displaying and recording it is the first step towards achieving sustainable savings that are justly considered as part of the green building approach.  Measuring energy use is primordial if we want to take the right decisions in terms of sustainable development. Precise and regular measurements, combined with suitable corrective actions, are the key to efficient control over consumption and energy quality. When we monitor consumption, we make savings from 8 to 12%. So it is possible to set up simple but efficient action plans that will optimise performance.

    Electricity meters and Legrand measuring stations meter the electrical power consumed on a single-phase or three-phase circuit. These meters are of course placed downstream of the metering by the power supplier. They display power use in kWh and total and partial active energy. The total and partial reactive power, the instant current and instant voltage etc. are also measured. The digital multi-function measurement stations also measure electrical values of low voltage applications.

    LEGRAND MOSAIC ECO 1 and ECO 2 stand-alone sensor switches-Eclairage

    The Mosaic programme

    ECO 1 and ECO 2 stand-alone sensor switches

    The Legrand ECO1 and ECO2 stand-alone sensor switches can generate up to 55% energy savings according to a calculation of standard EN 15 193. They operate in automatic On/Off mode and measure the lighting level. Automatic On and Off functions are offered by the ECO1 mode. The ECO2 mode features a voluntary automatic On/Off action, according to standard EN 15 193. These sensor switches are easy to deploy, whether in a false ceiling, as a surface-mounted wall or ceiling fitting or as a flush-mounted unit.

    According to a calculation based on standard EN 15 193, in mode ECO2 and for a 100m² area with natural lighting, these sensor switches can make considerable savings: Up to €80/year on green/yellow rate and up to €130/year on blue rate. What is more up to 120 kg of CO2 equivalent of pollution-generating gases can be saved. This example shows the significant role of a lighting management system in a sustainable development construction project. Stand-alone sensor switches generate an ROI within 2 years on average, and sustainable savings thereafter.

    LEGRAND MOSAIC ECO 1 and ECO 2 Lightning Control System

    LEGRAND Lighting control system

    The lighting control system represents a solution to reduce consumption in commercial applications and improve the global costs in terms of building maintenance. It includes ECO1 and ECO2 stand-alone sensors, the installation on BUS/SCS and stand-alone Radio/Zigbee sensors. This control system uses various lighting control solutions to make energy savings and ensure comfort of use. It is a genuine source of energy bill reductions and makes a valid contribution to sustainable development. The system can be used both in new buildings and renovations.

    BUS/SCS sensors can be used individually or for centralised installations. Their deployment is simple and usually done in technical ceilings. These detectors and controls are by default configured intuitively. The settings are calculated either by the programming software or by customising them on the equipment, by touch controls or wireless configuration via the sensors. According to a calculation based on the EN 15 193 standard and for a 100 m² area with natural lighting, BUS/SCS variable controllers in technical ceilings can make substantial annual savings. For 100 m², the savings could reach €100/year on green/yellow rate and up to €160/year on blue rate, or 160 kg of CO2 equivalent/year of pollution-generating gases. BUS/SCS sensors therefore make an efficient contribution to the green building approach.

    Stand-alone Radio/Zigbee sensors are generally used in addition to BUS/SCS devices. Such sensors are also used to independently control many different applications with individual controls or centralised control depending on the programming. The Office block equipment with its 230V Radio/Zigbee control will for example, control the office lighting and turn on / cut off PC power in parallel to the BUS/SCS. According to standard En 15 193 and with an ON/OFF lighting control, this type of detection can generate annual savings of up to €80/year at green/yellow rates and up to €130/year on blue rate. This represents 120 kg of CO2 equivalent per year. The BUS/SCS – Radio/Zigbee interface is used to connect a BUS/SCS installation and an additional Radio/Zigbee installation together.

    LEGRAND Green sockets in Business Environment - graph_02_EN

    LEGRAND Green sockets

    Green sockets are eco-sockets that can equip each work station when connected to specific circuits. These power outlet sockets are easy to use and deploy (flush-mounted, surface-mounted, in the ceiling, in the floor or close by). The Mosaic range of green sockets can reduce the consumption of power outlet circuits by up to 25%. These sockets can shut down PCs (screen and central unit) or put them on standby, cut power to certain machines (photocopiers, network printers, fax machines, beverage dispensers) at night and at weekends.

    They exist in different configurations: Small and large columns, floor boxes and blocks, notably office blocks and meeting room blocks. The latter integrate special energy-saving functions. For installations in renovated buildings, custom office blocks can integrate a time switch and RJ 45 outlets. Office blocks, columns and meeting room strips are ideal solutions for flexible commercial workspaces. The pleasing ergonomic and aesthetic features of these blocks offer a dash of elegance to office space. Green sockets are sustainable development equipment, therefore ideal for a green building approach.

    Full details specifications and Personnalised Quotation
    Available at SOGELEC LEGRAND & ABB  Dep.

  • Industry Reactive Power Compensation
  • Glossary Basic Terms A-G
  • Glossary Basic Terms H-Z
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