Fuji "MOLTRA" Cast-Resin Dry Type Transformers
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Power Supply Solution of The Industry
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Fuji Cast Resin Transformers
Our company
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Fuji Electric developed our first cast-resin transformers in Japan in 1974.
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Third party certification of IEC60076-11 was obtained in 2006
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Secured top market share in Japan for 22 consecutive years in 2010
Standard Specifications
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Rated voltage; up to 36kV, Rated power; up to 24,000kVA
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Insulation system temperature; 155℃(F)
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Type of cooling; AN (Naturally-Cooled), AF (Forced-air-Cooled)
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Maximum ambient temperature; 40℃, yearly average temperature; 20℃
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Utilizing aluminum for winding and copper for terminal
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Climatic, environmental and fire behavior classes C2, E2 and F1.
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Insulation system temperature; 180℃(H)
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High & Super-high efficiency type
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Low noise type
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Maximum ambient temperature 50℃
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Rectifier transformer (provision for harmonics)
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In-rush current reduced design to standard value 15~20 times
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Winding temperature rise reduced design for higher ambient temperature site
Applications
・Transformer Applications Designs
Fuji Cast-Resin Transformer can be applied to power transformers, distribution tansformers, transformers for static converter (such as VSD : variable-speed drive ).
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Japan's largest capacity cast resign transformer at 17MVA, the units are installed on the 13th floor of a 41story building using the site-reassemble method. This technique allows for product installation in applications with size and weight restrictions.
Technical data3-phase 60Hz
13MVA(AN)/17MVA(AF) 22.0/6.6kV
Insulation class H
Deployment of Cast Resin Transformers
2008 - 3 units deployed to a high-rise building the city of Osaka, Japan.
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Optimum design results in compact size and lightweight transformers
Features
Compact and light : Space saving with slip-on cable joint ⇒ Possible to install inside the shaft
High efficiency : 99.2% or more at rated power
Salt resistance : (*)ESDD 0.06mg/cm2
Vibration resistance : acceleration 0.5G (max.3G for TR body)
Able to withstand AC 77kV Separate-source test voltage for 2000m above sea level site
Technical data
3-phase 60Hz 2700kVA 0.69/34.5kV Insulation class H
Delivery Record
Approximately 500units delivered since 2007
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Features
Withstand cyclic load; excellent overload capability
Provision for harmonics of rectifier
; taking into account of the additional losses
Withstand 170kV Lightning impulse test voltage
refer to IEC60076-11
Technical data
3-phase 50Hz 2700kVA 33.0/2x0.59kV
Insulation class H
With protection enclosure IP21
Delivery Record
Approximately 170units delivered to the railway substations in the Middle East in 2009
Product Features
Vacuum-Casting
Our product is manufactured with vacuum casting method using a premium metal pattern, resulting in a thick resin layer with a smooth surface
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Fire Resistant
Epoxy resin possesses self-extinguishing and fire resistant properties, making it safe in flammable environments
Fuji Electric's cast resin transformer successfully completed and passed all tests of IEC 60076-11 in 2006.
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Partial Discharge Free
Void-less : Excellent partial discharge characteristics.
In order to maintain superior quality, Fuji Electric voluntarily adopted the following stricter standard:
All units are subjected to partial discharge test.
Voltage that is twice that of the operating system is applied to ensure safety
Partial discharge is less than 10 pC (Pico-coulombs intensity)
Cast resin transformers are also coated in high-vacuum chambers to reduce air and other gases in the resin that could produce partial earth discharges. In effect, they hermetically seal the transformer's core.
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Shop Test Items
Measurement of insulation resistance
Measurement of winding resistance
Measurement of voltage ratio and phase displacement check
Measurement of short-circuit impedance and load loss
Measurement of no-load loss and current
Separate-source AC withstand voltage test
Induced AC withstand voltage test
Partial discharge measurement
Lightning impulse test
Temperature-rise test
Measurement of sound level
Applied standards
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IEC60076-11
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ANSI/IEEE C57.12.01
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GB6450, GB/T10228
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・JEC-2200 etc.
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Third Party Certification of IEC60076-11
Fuji cast resin transformers were officially certified after successful completion of all test items under IEC60076-11
This includes special test items and type test items by KEMA and CESI.
Certificate organization KEMA(Netherlands), CESI(Italy)
Features
Japan's first manufacturer to obtain IEC60076-11 certification
Third party certification ensures objective confirmation of product compliance
Special test certification; climatic class C2 (crack resistance)
; environmental class E2 (moisture resistance)
; fire behavior class F1 (fire resistance)
; short-circuit test
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Production Bases
Fuji Electric Corporation has two cast resin transformer production bases:
Chiba Factory in Japan, and Fuji Tusco Co.,Ltd in Thailand
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