Hussam al amin retrofilling with ester based transofmer dielectric fluid to improve fire safety

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Hussam al amin retrofilling with ester based transofmer dielectric fluid to improve fire safety

  1. 1. Retrofilling with Ester Based Transformer Dielectric Fluid to Improve Fire Safety, Moisture Tolerance and Environmental Behaviour March 2011 Copyright 2011 M&I Materials Ltd. Products of M&I Materials Ltd.
  2. 2. Transformer Fluids Introduction Poor Excellent Poor Moisture Tolerance No Yes No Fully Biodegradable >350°C 316°C 170°C Typical Fire point Synthetic Product Synthetic Product Crude Oil Source Silicone Liquid Synthetic Ester Mineral Oil
  3. 3. Transformer Fluids Introduction <ul><li>Mineral oil fires are common occurrence </li></ul><ul><li>Risk to human life </li></ul><ul><li>Extremely costly in terms of damage and clean up (£m’s) </li></ul><ul><li>Knock on effects – e.g. Blackouts </li></ul><ul><li>Down-time cost </li></ul><ul><li>Transformer replacement </li></ul><ul><li>Increased insurance premiums </li></ul><ul><li>Damage to reputation </li></ul>
  4. 4. Typical Flash and Fire Point <ul><li>Flash Point </li></ul><ul><ul><li>Defined as temperature at which vapour ignites, but will not sustain burning when flame is removed </li></ul></ul><ul><li>Fire Point </li></ul><ul><ul><li>Defined as temperature at which vapour ignites and sustains burning for at least 5 seconds when source of ignition is removed </li></ul></ul>>350°C 260°C Silicone Liquid 170°C 150°C Mineral Oil 316 °C 260°C MIDEL 7131 Fire Point (ISO 2592 - COC) Flash Point (ISO 2719 - Pensky) Fluid
  5. 5. Ignition Resistance Mineral Oil 3 mins MIDEL 7131 3 mins Mineral Oil 4 mins MIDEL 7131 70 mins
  6. 6. Insurance Advice <ul><li>FM Global ® loss prevention datasheet 5-4 transformers </li></ul><ul><li>Spacing between transformers </li></ul>0.9m 0.9m Approved Transformer or Equivalent 7.6m 1.5m Approved Less Flammable Fluid 15.2m 7.6m Mineral Oil 40,000litres 2,000litres Min. Spacing Transformer
  7. 7. Comparative Biodegradation Rates
  8. 8. Containment Requirements <ul><li>FM Global ® guidance </li></ul><ul><li>Much larger amount of fluid permitted before containment is required </li></ul>>10,000 Approved biodegradable fluid >5,000 Approved less flammable fluid >1,900 Mineral Oil Volume Requiring Containment (litres) Fluid Classification
  9. 9. Moisture Saturation Comparison 220ppm Silicone Liquid 55ppm Mineral Oil 2700ppm MIDEL 7131 Saturation Limit @ 20°C Fluid
  10. 10. Breakdown Voltage vs. Relative Moisture Ref: Prof. S. Tenbohlen Stuttgart
  11. 11. Moisture Uptake Comparison 90% Humidity Ref: I. Fofana University of Quebec
  12. 12. Condensation in Wet Transformers
  13. 13. Mineral Oil Low Temperature Breakdown Ref: H. Borsi Schering Institute
  14. 14. Synthetic Ester Low Temperature Breakdown Ref: H. Borsi Schering Institute
  15. 15. Corrosive Sulphur <ul><li>MIDEL 7131 does not contain corrosive sulphur </li></ul><ul><li>Mineral oil source of corrosive sulphur compounds </li></ul><ul><li>Causes copper sulphide deposit on paper and copper windings </li></ul><ul><li>Identified as cause of failure of power transformers </li></ul><ul><li>MIDEL 7131 independently tested to ASTM D 1275 B and IEC 62535 </li></ul><ul><li>MIDEL 7131 was found to be non-corrosive in both tests </li></ul><ul><li>MIDEL 7131 tested for DBDS, none found </li></ul>
  16. 16. Why Retrofill with MIDEL 7131? <ul><li>Retrofilling is the replacement of the fluid in the transformer </li></ul><ul><li>Increased Fire Safety </li></ul><ul><ul><li>Significantly improves fluid fire point </li></ul></ul><ul><li>High Performance </li></ul><ul><ul><li>Provides moisture tolerance </li></ul></ul><ul><ul><li>Reduces maintenance </li></ul></ul><ul><ul><li>MIDEL 7131 is very oxidation stable, suitable for breathing transformers </li></ul></ul><ul><li>Greater environmental protection </li></ul><ul><ul><li>Accelerates biodegradation rate </li></ul></ul>
  17. 17. Retrofilling Case Study – SEWA 2009 <ul><li>Sharjah Water and Electricity Authority chose MIDEL 7131 for a retrofilling pilot study </li></ul><ul><li>Sharjah Gold Souk (tourist attraction), UAE </li></ul><ul><li>Mineral oil transformer, 1500kva, 11/0.433kV, 2001 </li></ul><ul><li>Densely populated area, running at high temperatures – deemed high risk </li></ul><ul><li>Initial test results excellent & analysis to take place over next few years to assess progress </li></ul>
  18. 18. Retrofilling Experience - Vattenfall <ul><li>Large utility with operations throughout Europe </li></ul><ul><li>In Berlin: Started retrofilling 1992 in high risk areas </li></ul><ul><li>500 transformers retrofilled with ester between 1992 -1994 </li></ul><ul><li>From 1994, on average 10 transformers per year retrofilled </li></ul><ul><li>All new distribution transformers in risk areas are ester filled </li></ul><ul><li>1,900 transformers in total with ester </li></ul>
  19. 19. Vattenfall Results – Pilot Phase
  20. 20. Vattenfall Results – Long Term
  21. 21. Retrofilling Field Trial - Devonport <ul><li>Shipyard in South of England </li></ul><ul><li>Ex Ministry of Defence </li></ul><ul><li>800 kVA, 30 year old transformer </li></ul><ul><li>Joint retrofilling trial in 2004 </li></ul><ul><li>Wet transformer, out of service </li></ul>
  22. 22. Retrofilling Field Trial - Devonport <ul><li>Transformer was out of service due to low insulation resistance </li></ul><ul><li>Retrofilled with MIDEL 7131 </li></ul><ul><li>Insulation resistance increased and transformer back in service </li></ul>80M  <20M  Core Insulation Reading 400ppm 51.4ppm Moisture Content >65kV 22kV Breakdown Voltage After (MIDEL 7131) Before (Mineral oil)
  23. 23. Devonport Breakdown Voltage Results
  24. 24. Thank-you for listening Hussam Al-Amin – Business Development Manager Tel: +44 161 864 5495 Email: HussamAl-Amin@mimaterials.com

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