Presentation February 2017 www.vimap-technics.com Moisture in - PowerPoint PPT Presentation

Presentation February 2017 www.vimap-technics.com

Moisture in power transformers www.vimap-technics.com

Origin of water in power transformers Depolymerization of cellulose (Water is by-product of cellulose ageing) Water from atmosphere (Poor maintenance of air breathers and gaskets) Water remained from production (Appx. 0,5 % by celullose weight) Even if f a a transformer is s lea eak-free an and the oi oil l pr preserv rvation system is s per performin ing fl flawless ssly, , water is s PR PRODUCED as as a a BY-PRODUCT of of the nor normal cell cellulo lose ag agein ing pr process! www.vimap-technics.com

Distribution of water in power transformers 350 About 99% of water in power transformer 300 is stored in cellulose insulation while only about 1% is in the oil. 250 200 150 Example: Power transformer 300 MVA at 50 ° C 100 60 t of oil with 20 ppm (µg/kg) water content  1,2 lit 50 10 t of cellulose with 3% water content  300 lit 0 Water in oil Water in solid insulation www.vimap-technics.com

Consequences of water in oil EXCESSIVE WATER IN TRANSFORMER LEADS TO: Accelerated degradation of complete insulation Reduced dielectric characteristics of insulation Reduced transformer resistance to electrical stress Malfunction of power transformer & Reduced lifetime of power transformer www.vimap-technics.com

Water influence on power transformers lifetime Moisture accelerates ageing of 100 cellulose insulation. 30 Increase of water content in cellulose for 1% doubles the rate of its aging. Ageing rate 10 ( , global leader in electrical insulation for transformer manufacturers) Power transformer lifetime is determined by lifetime of its 1 3 % 0,1 1 10 cellulose insulation. Water content % Moisture content in solid insulation (%) 1 3 Insulation lifetime at 80 ° C (years) 40 10 www.vimap-technics.com

Permissible water content in power transformers In the more recent IEEE Std C57.106 – 2002 (2) the permissible moisture level in paper is inferred from values of water content in oil, assuming thermal stability and moisture equilibrium between paper and oil Maximum water content in oil ppm Transformer rated Equivalent water voltage content in paper 50 ° C 60 ° C 70 ° C Up to 69 kV 27 35 55 3% 69 to 230 kV 12 20 30 2% 230 kV and above 10 12 15 1.25% www.vimap-technics.com

Permissible water content in power transformers Interpretation of moisture content by various standards and practices: < 1 % As new 1 - 2 % Dry 2 - 3 % Moderately wet 3 - 4.5 % Wet > 4.5 % Excessively wet Typical moisture content in cellulose insulation: New transformer: 0.5 % Aged transformer: 2 - 4 % Normal increase of water content is typically 0.05 - 0.2 % per year. www.vimap-technics.com

Mobil ile unit it for or in insu sula latin ing oil oil dehydration VIM IMAP PORTABLE St Stationary ry unit it for or on on-load tr tran ansformer in insu sulation (o (oil il-celu lull llose) dryin ing VIM IMAP RCID ID www.vimap-technics.com

Operation principle  Water from oil is adsorbed using granulated synthetic adsorbent which bonds water molecules and permanently retain them in their pores as the oil is circulated through the dehydration vessel  No oil vacuuming  No oil heating www.vimap-technics.com

New oil Ne oil is is not ot dry oil oil New oil il must be drie ried prio rior to fill fillin ing into th in the elec lectr tric ical l equip ipment Transformer oil delivered by the manufacturer is not dry and not suitable for  filling into electric equipment According to IEC 60296 new oil delivered in drums or IBC has a max. water  content 40 ppm (mg/kg) while min. dielectric strength is 30 kV Characteristics of new oil kept in drums, IBC or cisterns will further degrade  with time due to improper storage, bad sealing, variation of ambient temperature. www.vimap-technics.com

VIMAP PORTABLE – scope of application  Suitable for on on-sit ite de dehydration and filtration of insulating oil in power and distribution transformers and tap changers  De Dehydration of of oil oil in bar barrels, IBC and for continual maintenance of dry oil in cisterns  De Dehydration of of ne new oi oils ls prior to filling into the electrical equipment  Any oil manipulation or oi oil l tr transfer on on-sit ite or or in wor orkshop during the reparation  Can be used simply as as a a tr transfer pu pump (without drying) www.vimap-technics.com

VIMAP-6 PORTABLE - characteristics Oil Oil ch characteristi tics Unit Un it Be Before Pass ss no no 1 Pass ass no no 2 Pass ass no no 3 treatment Water content ppm pm 100 100 < 20 20 < 10 10 < 3 Dielectric Di ic strength kV kV 20 20 > 40 40 > 60 60 > 70 70 Fl Flow w Power Dimensio Dim ions Adsorbent capacit Ads ity Wei eight Typ ype lit/h t/h con onsumptio ion kW kW mm mm wi withou out rep epla lacement * kg kg VI VIMA MAP – 6 0-600 600 0.55 594x878x491 50 50.00 000 110 110 Quantity of oil in kilograms which can be dehydrated without replacement of adsorbent cartridges is about 50.000 kg, provided that there is no inlet of free water and tar into the device. Free water or tar draining from the bottom of tanks or transformers is required.  No oil inhibitors (antioxidant additives) removal www.vimap-technics.com

VIMAP PORTABLE - configurations VIM IMAP-6 PORTABLE (basic configuration) • One vessel • Adsorbent filling - 25 kg • Water holding capacity - cca. 5 kg • Gear pump 0-600 l/h • Electric motor 0.37 (0,55) kW • Contact manometer • Frequency converter • Switch off relay • Particle filter 10 µm • Frame with wheels mounted • 2 x 5 m elastic hoses with Q.R.C. • Bypass line (pumping without drying) www.vimap-technics.com

VIMAP PORTABLE - configurations MS MSP PORTABLE (additional to basic configuration)  Two moisture sensors installed on inlet and outlet lines of the unit for measuring water content in oil and adsorbents saturation control  Display for continual monitoring of oil moisture (ppm) and temperature ( ° C) in both lines www.vimap-technics.com

VIMAP PORTABLE - configurations VIM IMAP PORTABLE is available in other configurations:  Number and size of vessels/adsorbent quantity according to request  Customised design per specific application and customer requirement www.vimap-technics.com

VIMAP PORTABLE- Advantages • Lo Low ope operation cos osts ts • Hig High efficiency in n oi oil l de dehydration • Eas asy ha handlin ing, g, transport an and main aintenance • Su Suit itable for or on-site ope operatio ion or or in n wor orkshop • Min inim imal ene energy consumptio ion • Sa Safe an and ec ecolo logical pr process • No o oi oil l he heatin ing • No o oi oil l vacu acuuming • No o oi oil l an antio ioxid idant ad additiv ives rem emoval www.vimap-technics.com

VIMAP RCID On Load (On Line) Power Transformer Insulation Dry-out Unit Preventive maintenance Continual maintenance of low moisture level in both oil and cellulose insulation Corrective maintenance Reduction of moisture content in complete insulation Improvement of insulation characteristics Increase of power transformers safety and its lifetime www.vimap-technics.com

VIMAP RCID On Load (On Line) Power Transformer Insulation Dry-out Unit No oil heating No oil vacuuming No antioxidant additives removing No dissolved gasses removing - Designed for safe continual unattended operation on energized power transformers - Water holding capacity appx. 5 kg each column - Various numbers of columns www.vimap-technics.com

VIMAP RCID On Load (On Line) Power Transformer Insulation Dry-out Unit Safety and monitoring elements Sensors mounted on both inlet and outlet lines of the system display moisture contents (ppm) and oil temperature ( ° C) and indicate adsorbents saturation level Ethernet board - working parameters are available via web browser or via email Moisture management system SCADA operated Oil leakage, air ingress and high/low pressure sensors shut the system off, isolating it from the transformer, in the event of any malfunction CMGSM module sends SMS notification Sound and visual alarm www.vimap-technics.com

VIMAP RCID- Advantages  Low investment costs  Low operation costs  Simple handling and maintenance  No transformer operation interruption  Safe transformer operation  High insulating oil drying efficiency  Depth drying of solid insulation  Min. power consumption  Remote monitoring of working parameters  Environmentally friendly process  Non-invasive process  No oil heating  No oil vacuuming  No antioxidant additives removing  No dissolved gasses removing www.vimap-technics.com

Questions? Discussion & www.vimap-technics.com