Sectional Switch Protection Cabinet

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The cabinet is designed for protecting 110kV sectional (bus-tie) circuit breakers. It serves to control the sectional circuit breaker, automate protection of sections, and monitor voltage transformers in the section. Depending on the standard configuration, the cabinet may house one or two sets of protection, automation, and control systems for the sectional circuit breaker. 

Cabinet design:

  • Two-stage overcurrent protection;
  • Three-stage non-directional zero-sequence current protection;
  • Phase failure protection;
  • Circuit breaker tripping via CBFP (Circuit Breaker Failure Protection) terminal
  • Two-channel trip circuit monitoring;
  • Closing circuit monitoring;
  • Automatic reclosing;
  • Incomplete phase sequence protection;
  • Time-delayed directional overcurrent protection;
  • Disconnector monitoring and control;
  • Discrete and analog event recording.

The cabinet's AC circuits provide connection to secondary circuits of main current transformers with rated secondary current of 1A or 5A.

Cabinet components

  • Current measurement circuits;
  • Voltage measurement circuits;
  • Protection input/output circuits;
  • Relay control circuits;
  • Lighting and power outlet circuits.

Technical specifications:

Parameter Value
Power Supply Parameters
Operational voltage U~sup~ 220V, DC
Light Circuit Parameters
AC voltage rating 220V
Frequency rating 50Hz
Measurement Circuit Parameters
Rated AC current I~nom~ 5А
Rated line voltage U~nom~ 100V
Connection Parameters
Communication interface Ethernet: TX (RJ45)
Communication protocol Modbus IEC 60870-5-103
General Characteristics
Ambient temperature range (20 ± 5) °С
Relative humidity ≤80%

Overall dimensions of the device:

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

Cabinet design:

The cabinet features a grounded metal enclosure with two-sided access, a transparent front door, and a solid metal rear door. All metal components are corrosion-protected. Surfaces are coated with epoxy-polyester powder paint, and insulating materials are flame-retardant. For convenient external cable connections, the cabinet includes a base frame, grounding busbar, and cable tie-off rails.

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