Complete transformer substations with capacity 25-250 kVA three-phase alternating current with a frequency of 50 Hz voltage 10 (6) \\ 0.4 kV are single-transformer substations of dead-end type outdoor installation and serve for power supply agricultural consumers, individual populations points and small industrial facilities in areas with a temperate climate (from -45 ° С to + 40 ° С). Type of climatic modification U1 in accordance with GOST15150. Normal operation of the KTPM is ensured when following conditions: 1. Altitude above sea level - no more than 1000 m; 2. Environment - non-explosive, not containing conductive dust, corrosive gases and vapors in concentrations that reduce the parameters of the KTP within unacceptable limits; 3. Wind speed up to 36 m / s (wind pressure up to 800 Pa); 4. Type of atmosphere - II in accordance with GOST 15150. KTPM has the following components: 1. Device on the high voltage side (UHV); 2. Transformer of power outdoor installation three-phase or single-phase transformer of OMP-10 or 6kV type; 3. Switchgear on the low voltage side (LVSN) with circuit breakers on outgoing lines and street lighting line.