Single-phase complete transformer substations with rated power 1.25; 2.5; 4 and 10 kVА for HV voltage 10 or 6 kV and LV voltage 0.23 kV (КТП further on) are assigned for reception, transformation and distribution of the electrical power of single-phase AC with 50 Hz frequency.

Single-phase complete transformer substations (КТПО) are intended for usage in the systems of power supply in railway power networks and for power supply of small objects in the regions with temporary climatic conditions (from -45С up to +40С).

The HV input is overhead, the outgoing lines taps are cable ones.

The automatic breakers are installed on the LV side. Their number and rated current are given in the table. On the customer’s request the outgoing lines can be equipped with protective devices.

In the delivery set of the КТПО the HV disconnector, high-voltage protective devices, dischargers, power transformer and the РУНН switchboard are included.

The overall and mounting dimensions and the electric one-line schematic diagram are given in the figures 1,2.

The order example of the КТПО with rated power 10 kV•А for HV rated voltage 10 kV, with automatic breakers on the outgoing lines: "КТПО-10/10/0,23-А-У1 ТУ У 31.2-00213440-014-2005"