Transformer Protection Cabinet

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The cabinet is designed for protecting 220/10kV power transformers and includes:

  • Transformer differential current protection;
  • Zero-sequence current protection;
  • Overcurrent protection for HV and LV sides;
  • Circuit breaker failure protection (CBFP) for transformer tripping;
  • Oil temperature monitoring;
  • Over/under voltage protection;
  • Over/under frequency protection;
  • Overload protection;
  • Signals reception from gas protection relays (alarm and trip stages), OLTC gas protection, oil temperature sensors, oil level sensors, and cooling system fault signals;
  • Trip signals reception from transformer and OLTC gas protection trip stages;
  • Discrete and analog event recording.

The AC circuits provide connection to main CT secondary circuits with 1A or 5A rated current.

Cabinet components:

  • Current and voltage measurement circuits;
  • Lighting and power outlet circuits;
  • Operational power supply circuits;
  • Protection terminal binary input circuits;
  • Protection terminal binary output circuits;
  • Output line circuits.
 

 
Technical Specifications:
 
Parameters Value
Power supply 
Operational voltage 220V, DC 
Lighting circuit 
AC voltage rating 220V, AC
Frequency rating 50Hz
Measurement circuit 
Rated current 5А
Rated voltage 100V, AC
General Characteristics
Ambient temperature (20 ± 5) °С
Protection rating (IP) IP 31
Relative humidity ≤80%

 

Dimensions:

  • Height 2130 mm;
  • Width 800 mm;
  • Deep 650 mm.

Cabinet design:

The cabinet features a grounded metal enclosure (OPTIMA frame, RAL7035 color) with two-sided access, transparent front door, and solid rear door. All metal components are corrosion-protected with epoxy-polyester powder coating. Insulating materials are flame-retardant. Includes cable grounding busbar and tie-off rails. Complies with ST RK GOST R 51321.1-2010 (IEC 60439-1-92).