Electrical Contracting News (ECN) June 2016 - Page 43

SPECIAL FEATURE RENEWABLES & SUSTAINABILITY On the whole, power is supplied at a higher voltage than is necessary. “ VOLTAGE OPTIMISATION IS NEEDED TO CORRECT THE SUPPLY ISSUES CAUSED BY THE HIGH VOLTAGE INFRASTRUCTURE. Efficient transformers will provide greater return on investment over its lifespan and it is important to source transformers that exceed Eco Design 2021 efficiency specifications. LV side optimisation Any excess voltage above the VO set-point is chopped and returned back to the grid. issues at source (HV side optimisation). If a company only has an LV supply then the most effective approach will be to address the issues at the LV side (LV optimisation). HV side optimisation HV side optimisation technologies offer solutions to sites that own their own distribution transformers. Many technologies exist, but there is only one system currently on the market, which provides HV, electronic variable voltage optimisation. This is a combined solution, which replaces an on-site, inefficient HV transformer with an amorphous core superlow loss HV transformer, with integrated electronic-dynamic VO technology. The system can take up to 33,000V input and provides a fully electronically regulated 380V, or user-defined, voltage output. Technology also exists that will allow the user to alter the defined voltage locally through a Human Machine Interface (HMI) on site or remotely via the Internet. The HMI allows users to manage and monitor the system in real time to ensure maximum savings are being realised. Depending on the age and type of the transformer that it replaces, an amorphous core transformer can provide between one and five per cent savings, simply due to its efficiency. In addition the integrated VO technology can be expected to provide a further saving of between 12 and 15 per cent. As the name suggests, LV side optimisation is connected to the low voltage infrastructure. There are two variations of LV side optimisation technology available: fixed and variable (also known as electronic-dynamic, electronic or intelligent VO). Fixed VO systems reduce the incoming voltage by a set amount to the optimum level for site operations. However, output varies as the input voltage varies. Variable VO systems set the output voltage at the optimum level and maintain this by systematically managing the peaks and troughs in the power supplied – irrespective of the incoming voltage levels – to ensure that voltage \\YY]Bۜ[ XH][ \YB[Z\][ۈ]H[\O•\H[ٛܛY\\Y\[H\Y›[Z\HH\X\\XوH\[\YY]H\H \\[ KXܙ[\[\X\\Xœ\]Z\Y]HY Xۙ\[ KH\\[\\X[H[[\][YH[XH\[[YB\[ܙX\Y܈XܙX\Y\[ٛܛX][ۈ][[H\[[^\[ٛܛYYYKH\H\[HH\[[[HXۙ[[وHœ\[K\Z[HXYۙ]X^]\\H[X[ۈوH]\H\[ X\‚HX[ۈوH\H\[ \X[H L\[ H]\H\[[B]H\X[ۈH\H\[ \H]\\XYXH[XX]B\K\H]\H\[\X[[\KX\\[H\\[܂XX]H[\K\H\H\XYXۂHۜ[\[ۈوHY \YX\˜HYX[ۈو\ۜ[YYHHY Y[HXX[][˂[[\H\\[H^\YBXݙHH] \[ \Y[]\YXHܚY [\][š[XYY]]H\ XSQKX\H\H[\œXXYHH[Z[\ BXX[ۈ\\][H[ٛܛY\KHY]]H\YYXŠXSQHX[܈  \[و][]H[XZ[[  \[][Z[H\]Z\Y[YXY[H[\ݙ[Y[˂[\ݚ[\]Z\Y[\ܛX[B[Z\[H\HYH܈BZ[[[[][\]Z\Y[[XX[\HHX\H\[] YX[XZ[[[Hˈ\][™\]Z\Y[]HY\YH[]\\YۙY܈\[\ݙB\ܛX[NۈH۝\H]\HYXوYX[]Y\[܂^[\HH ]Y[[\[[\\Y] [XY]HۛH MB\[و]]YYK][[ZB \[[ܙH\[[ۜ[YB[[\[[ܙH[\KY[H\HH[܈][ܙHYB[]YY]\۸&][[H\\]\\\H^H[\H\X] ™^[HYHو[ܜH\[Z\\][[\\]\\˂ ‚ M 8$\\[ ‚L Ǩ M M