Small Power Transformers
Hitachi Energy's vacuum cast coil transformers use the most technologically advanced design to support the extreme conditions present in chemical processing, extra heavy traction, and heavy industrial applications. Hitachi Energy has design and manufacturing flexibility to produce oval or round shaped core and coil assemblies for optimum space utilization.
These transformers are almost maintenance free, and they are manufactured in accordance with industry and international standards. The VCC dry-type transformers are moisture-proof, suitable for operation in humid or heavily polluted environments. They are the ideal transformers for operation in environments with humidity higher than 95 % as well as at temperatures down to -25 °C. There is less space and less civil work needed, no special safety features are required (fire detection). They are maintenance free and extend transformer life due to low thermal and dialectic ageing. It can be installed closer to the point of consumption, reducing load cable losses. Safe and environmental friendly, reduced environmental contamination and zero risk of leakage of flammable or contaminating substances. High resistance to short circuits and high capacity to support overload. They are capable of withstanding the most severe of rolling and vibrating conditions. Up to 63 MVA High voltage up to 36 kV Low voltage up to 24 kV Classes E2, C2, F1 Partial discharges <10 pC Protection degree: IP00 - IP54 Insulation system temperature: 155ºC (F) |
RESIBLOC transformers are produced in full compliance with DIN EN ISO 9001, DIN EN ISO 14001 and BS OHSAS 18001 standards.
The material Resin is of immense strength. Modern winding processes, combined with electronically controlled winding machinery, ensure an even distribution of glass fiber roving’s and epoxy resin, and the highest precision in the manufacture of transformer windings. Multi-spaced ribs, built-in during the winding process, integrate the HV and LV windings into a single compact winding block. No risk of any contamination to the application environment and non-explosive with high resistance to flame. Severe load cycles (cold start to maximum load) and high short circuit withstand. Exposure to harsh climates (freezing, heat, chemicals, moisture); minimal maintenance. Up to 63 MVA High voltage up to 36 kV Low voltage up to 24 kV Classes E2, E3, C2, F1 Frequencies: 50 Hz, 60 Hz and 16 2/3 Hz Cooling: AN / ANAN / ANAF / AFWF Insulation system temperature: F and H Partial discharges <10 pC Protection degree: IP00 - IP54 |
Vacuum Pressure Encapsulated (VPE) transformer was developed to meet stringent shipboard applications for the US Navy. Hitachi Energy uses a multiple sealant process on VPE transformers, which provides enhanced protection against moisture, salt air, dust, and industrial contaminants. The sealing process uses resin, which provides excellent dielectric strength and extended life expectancy. VPE transformers provide excellent mechanical and short circuit strength, no danger of fire or explosion, less weight than comparable cast coil units.
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Vacuum Pressure Impregnated (VPI) transformers are vacuum pressure impregnated with a high temperature polyester varnish. VPI ventilated dry-type transformers are designed to meet most commercial and industrial applications. VPI transformers provide excellent mechanical and short circuit strength, no danger of fire or explosion, and no liquids to leak.
Hitachi Energy’s VPE and VPI transformers are manufactured in ISO 9001 certified factories and are UL listed. Up to 30 MVA High voltage up to 36 kV Low voltage up to 24 kV Classes E2, C2, F1 Frequencies: 50 Hz, 60 Hz and 16 2/3 Hz Cooling: AN / ANAN / ANAF / AFWF Insulation system temperature: F and H Partial discharges< 10 pC Protection degree: IP00 - IP54 |
Traditionally, dry-type transformers are being used for distribution and industrial applications with rated power and voltage not higher than 15 MVA and 36 kV.
Hitachi Energy offers now also dry-type transformers for the 52 kV and the 72.5 kV voltage class with a power rating of up to 63 MVA. A dry-type on-load tap changer is also available. The special features of Hitachi Energy's sub transmission dry-type transformers are superior safety and environmental friendliness especially in urbanized areas where it enabled safe and simple indoor substations at higher voltage in heavily populated areas. HiDry72 offers the same functionalities as liquid-immerse transformers. It is suitable for new or retrofit installations, Y- or D- connected, and can be used indoors and with an enclosure for outdoor application. Hitachi Energy dry-type transformers offer the highest level of short circuit strength and require a minimum of maintenance. Up to 63 MVA High voltage up to 72.5 kV Low voltage up to 36 kV Frequencies: 50 Hz, 60 Hz Cooling: AN / ANAF /AFWF Insulation system temperature: F Partial discharges: <10 pC Protection degree: from IP00 till IP55 Indoor or outdoor installations |
Substation distribution transformers have cover-mounted, primary and secondary bushings and can be provided with load tap changers (LTC). They are generally connected directly to overhead utility power lines.
Unit substation distribution transformers are generally close coupled to switchgear, motor control, bus duct, or another type of incoming and outgoing equipment. Hitachi Energy’s proven design offers excellent mechanical strength that has been proven through years of service and special testing. Hitachi Energy uses a low frequency heating insulation drying process where the insulation is dried in its own tank and is never exposed to the atmosphere once it dries. Rated power: up to 10,000 kVA Rated voltage: up to 33 kV Cooling type: ONAN / ONAF / ODAF Available fluids: mineral oil and ester fluids (natural and synthetic) have cover-mounted, primary and secondary bushings and can be provided with load tap changers (LTC). They are generally connected directly to overhead utility power lines. Unit substation distribution transformers are generally close coupled to switchgear, motor control, bus duct, or another type of incoming and outgoing equipment. Hitachi Energy's proven design offers excellent mechanical strength that has been proven through years of service and special testing. Hitachi Energy uses a low frequency heating insulation drying process where the insulation is dried in its own tank and is never exposed to the atmosphere once it dries. Rated power: up to 10,000 kVA Rated voltage: up to 33 kV Cooling type: ONAN / ONAF / ODAF Available fluids: mineral oil and ester fluids (natural and synthetic) |