MIDEL 7131 has been used for many years in electric freight locomotives, both as the transformer fluid and in some cases as the coolant for the converters.
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There has been a long history of use of MIDEL filled power transformers in Sweden, with Vattenfall having installed their first 151kV unit back in 2002. Following the success of Vattenfall’s experience other utilities started to take up the MIDEL option, in order to greatly improve fire safety and reduce environmental impact.
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Heathrow airport is one of the world’s busiest hubs, serving millions of customers a year. Throughout the airport there are distribution transformers providing power for critical services. Originally all these transformers were cast resin but there were some problems which prompted the user to look for a solution.
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ESC has been installing Dry Type transformers in densely populated areas since 1990. Today, around 25% of those assets are Dry Type Transformers. As an alternative to fire prone mineral oil transformers and costly dry type transformers, CESC is considering fire safe and environment-friendly ester oil filled transformers as a possible solution.
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MIDEL 7131 has been used over the years in many marine projects, from offshore oil rigs to military vessels and cruise liners. One such example of the use of Midel is onboard the Holland America Line fleet of cruise liners.
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Representatives from M&I Materials travelled to Sharjah to discuss the possibility of using MIDEL 7131 in these high risk transformers, in order to significantly reduce the fire hazard.
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DML had a 30 year old free breathing mineral oil distribution transformer located indoors within the dockyard. It had become extremely wet, with core insulation readings by Megger test of <20MΩ.
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Berlin presents very specific challenges for transformer installations since much of the city is zoned as water protection areas. In these areas it is necessary to take special precautions with regard to spillages of hazardous materials including mineral oil.
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When the country of Azerbaijan won the right to host the Eurovision song contest, by winning in 2011, they needed a new arena to hold the event in and started to construct the Baku Crystal Hall, under very tight time constraints to be ready for the following spring of 2012.
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The Greater Gabbard offshore wind farm is located in the outer Thames estuary in the UK, approximately 14 miles from the coast. It boasts 140 wind turbines in two arrays making it the world’s largest offshore wind farm at the time of commissioning.
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In an attempt to give companies a simpler starting point for their decision making, we reviewed the many materials, resources and experience we have in transformer fluids and put together a list of the top 4 reasons to retrofill a transformer with an ester fluid instead of mineral oil.
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Miscibility is an indication of the compatibility between different liquids. MIDEL 7131 synthetic ester and MIDEL eN natural ester fluids are fully miscible with transformer mineral oil, high molecular weight hydrocarbons and other transformer ester liquids.
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Degradation of the solid cellulose insulation in transformers (insulation ageing) is irreversible. Thermal ageing of cellulose materials cannot be avoided – however it can be slowed. Retrofilling transformers with MIDEL fluids, can have a positive impact on the issue of paper ageing.
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According to IEC 61936 transformers filled with K-class fluids can have reduced fire protection measures. In addition, certifiers such as FM Global provide a list of approved Less Flammable Transformer Fluids and guides for safe installation.
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There are a range of MIDEL fluids to suit various climatic conditions. The performance of each fluid under cold climate conditions can be characterised by the pour point.
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Ester fluids can absorb large amounts of moisture with no reduction of breakdown voltage. They have a higher saturation point – and are more tolerant of water – than mineral oil. A comparison of the saturation curves of different fluids is shown below.
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Ester fluids can absorb large amounts of moisture with no reduction of breakdown voltage. They have a higher saturation point – and are more tolerant of water – than mineral oil. A comparison of the saturation curves of different fluids is shown below.
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Using much the same oil sampling and analysis methods you would use for mineral oil. The gasses esters produce during electrical and thermal faults are the same as for mineral oil, but the quantities and relative amounts are slightly different.
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The dielectric dissipation factor of ester-based liquids is higher than that of mineral oil, due to the polar chemical structure of the ester. This in turn leads to higher power factor values for clean, dry insulation than would normally be seen with mineral oil.
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Although MIDEL fluids are suitable for higher voltage levels in specifically designed transformers, retrofilling depends upon the voltage and power rating. As a general guideline the table below can be utilised.
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