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Distribution Transformers (medium PT) Power Transformers (Large PT)

Short Summary from second Meeting of the Ecodesign CF Subgroup on Large Power Transformers Brussels 28-09-2012. Distribution Transformers (medium PT) Power Transformers (Large PT). REMARK: European Commission can only regulate the manufacturer and not the customer-side of the transformer sale.

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Distribution Transformers (medium PT) Power Transformers (Large PT)

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  1. Short Summary fromsecond Meeting of the Ecodesign CF Subgroup on Large Power TransformersBrussels 28-09-2012 • Distribution Transformers (medium PT) • Power Transformers (Large PT) REMARK: European Commission can only regulate the manufacturer and not the customer-side of the transformer sale

  2. Dustribution Transformers (medium PT) The minimum energy performance requirements for MPT consist of maximum allowed load and no-load losses

  3. Dustribution Transformers (medium PT) DRAFT of EN xxxx- to become a HARMONIZED standard for ‘three-phase medium voltage transformers, with highest voltage of equipment not exceeding 36kV’

  4. Possible obstacles • Production capacity of raw material (silicon and amorphous steel) • Possible monopoly of raw material production • Increased cost and prices • Increased dimensions of products (it is often limited) • Increased level of noise – environmental aspect! (residental and closed areas) • Amorphous Metal Recycling System • Different view on future energy price level between Norway and EU (SINTEF) • Different interest rates within EU countries • Political issue?

  5. Power Transformers (Large PT) The minimum energy peak efficiency level Energy Efficiency calculation Conventional formula Proposed formula Efficiency The efficiency is the ratio of usable energy on the output of a transformers over the supplied energy on the input of the transformers The efficiency is maximal when no load losses equals load losses

  6. Losses due to load Permanently on cooling losses • For the purpose of EC regulation the formula has to : • Be simple and easy to apply • Be independent of rated power and definition of multi stage cooling • Be fair and non favoring any cooling type • Take into account all losses • And therefore the retained equation is : • Based on apparent power in VA (cos φ =1) • The maximum efficiency one • With the losses corrected at 20 °C + Average winding rise • i.e. 90 °C for OD cooled transformer • 85 °C for ON or OF cooled transformer. • With the permanent cooling losses No load losses Usable energy Supplied power

  7. Why use energy peak efficiency? • No expectation of load factor, so should be appropriate for a wide range of transformers • Compatible with procurement using loss capitalisation • Very difficult to make a transformer with poor core steel to meet minimum peak efficiency requirement And avoid problems when using maximum loss tables • Flexibility is needed to accommodate different modes of operation • Transport problems will be even bigger • Full load all the time • Part loading (network etc.) • Different levels of redundancy • Different ways of specifying rating (Continuous rated or Emergency rated)

  8. And therefore the proposed equation is: Which correspond to load factor of:

  9. Efficiency variation across load variation Efficiency dependence on load factor is small for usual LL/NLL ration For a ratio of 5 and 7.5 kηmax occurs at 0.4 Example given on the base of a 170 MVA

  10. Where to set minimum energy peak efficiency?Process flow with example: • To collect data about the existing population manufactured in the last 10 years • To calculate EE expressed as shown • To define the EE trend (for each class) • To define the minimum EE limit (according to the trend for each class)

  11. T&D presented materials (Thomas Fogelberg and GiulianoMonizza, both from ABB). • represents requirements from customers around Europe which were part of tenders and purchasing documents. All data came from 8 LPTs manufacturers and from recent past • huge difference between capitalisation factors values • Keep in mind that future Ecodesign Directive will be applied to all countries within EU no matter at which level is their capitalisation (price of energy, interest rate, years in service…) • does it look harmonized?

  12. Questions and issues: • what to do with long term MPT & LPT purchasing contracts with levels of losses above or peak efficiency bellow than it will be proscribed within Ecodesign Directive? • How to quantify savings and what we are gaining if we install new LPT with higher efficiency instead existing one? Money, Energy, CO2? Calculate in every specific case and then translate to CO2 emission 0,4kg/kWh? • And again: Are energy prices and interest rates political issues? • VITO representative saidthat he agreesthat project report does not cover all possibleoptions and consequences (transport problems, ability to replace DT and LPT and otherconstrains) but he repeatedthat project and studyarebasedon 7 base cases and it was necessary to have same assumptions as well as to neglect something. Otherwise it was not possible to do it and it will be extremely complicated Conclusion about LPT Everybody will have only benefit except utilities, regions or countries which did not already implemented high capitalization of losses during purchase process (see T&D table).

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