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Universal complete transformer Substation 35(20)/0.4 kV (KTPU)

Universal package transformer substation of KTPU series for 35(20)/0.4 kV is designed to receive, transform, and distribute three-phase alternating-current electric power with a commercial frequency of 50 Hz. The best solution is to use it for feeding small-size and remote facilities, where it is impossible to construct 220(110, 35)/6(10) kV step-down substations.

The following equipment is used in 35(20)/0.4 kV universal package transformer substation:

  1. power transformer of TMG (TM) series with a capacity of 25, 40, 63, 100, 160, 250, 400 or 630 kVA; 
  2. surge arresters of OPN-P series; 
  3. polymer or porcelain insulators;  
  4. disconnector of RGPZ 1-II-35/1000 UKhL1 (NF1 as per IEC) series.

The design features and advantages of 35(20)/0.4 kV KTPU are as follows:

  1. Electromechanical and electric interlocks are provided for in the substation.
  2. All required protection means are installed in KTPU against: atmospheric (lightning) overvoltage and switching overvoltage; line-to-line faults; overcharging and line-to-line faults on 0.4 kV lines. 
  3. High degree of prefabrication allows quickly installing the substation on a new place.  
  4. Easy maintenance and serviceability. 
  5. Made with a cabled or aerial outlet on the 0.4 kV side. 
  6. Reduced weight and size parameters. 
  Parameter name
Power transformer capacity, kVA
25; 40; 63; 100; 160; 250; 400; 630
Rated (linear) voltage on the high-voltage side, kV
Maximum operating voltage on the high-voltage side, kV
Rated voltage on the low-voltage side, kV
Rated fuse current (rating), kA
2.5; 8; 10; 16; 20; 31.5
Rated breaking current, kA
Short-time thermal current, kA:
·on the HV side (high-voltage device) 
·on the LV side (low-voltage switchgear)
Short-time electrodynamic current, kA:
·on the HV side (high-voltage device) 
·on the LV side (low-voltage switchgear)
Protection rating as per GOST 14254:
·for low-voltage switchgear
·for other  components
Winding circuit and vector group of transformer
Y/YN-0; Δ/YN-11
Sound level, no higher than, dBA
Overall dimensions, no more than, mm
     length x width x height
Weight, no more than, kg

Made in accordance with the Corporate Standard Ts 00212883 - 021:2014.