Description: Three phase transformers are offered by Kotsons. Applicable standards are IEC (International Technical Commission); ANSI (American National Standard Institution); BS (British Standards) and IS (Indian Standard). A wide range of distribution and power transformers ranging from 25 kVA to 20 MVA with voltage class of 33 kV is manufactured. These transformers can be breathing or hermetically sealed. Conventional transformers are fitted with a conservator with breather for free breathing while hermetically sealed are without breathing with bolted cover. Hermetically sealed transformers are totally maintenance free and are particularly suited for use in exposed outdoor environments such as moisture, salt or dust laden atmospheres. They are used extensively in chemical plants, oil and gas terminals where poor accessibility makes regular maintenance undesirable. Transformers immersed in synthetic coolants are suitable for use indoors, with adequate ventilation, or near to the load centre where oil would not be considered environmentally acceptable. The liquid filled transformers can be supplied with cooling either by corrugations on the side of the tank or PSR (pressed steel radiators) mounted on tank body. Transformers can be filled with either oil or one of several low flammability synthetic fluids such as middle. Both types of car be supplied with HV and LV switchgear incorporated into substations. Also available are conventional hermetically sealed/ boltedtype,indoor/outdoortype, pole/platform mounted 3 phase, 50/60 Hz, oil immersed, Onan/Onaf/Ofwf cooled, step up/step down, double wound with AI/Cu conductor, continuous duty transformers from 25 kVA to 20 MVA up to 33 kV Class with A Class insulation and designed to withstand short circuit and impulse test in accordance with IEC/BS/ANSIIIS/NEEMA.
