Oil seal transformers ТМГ type up to 35 kV voltage and 3200 kW power. TMG Transformers are distinguished by their ease of service, they have no oil expander, they are relatively compact. In contrast to the ТМГ11 type ТМГ21 transformers the low voltage coil is assembled not with wire but with aluminum foil, which provides a simpler design and high reliability.