Backup Protection Cabinet

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The cabinet is designed to provide protection for 110kV incoming circuit breakers. Its primary function is to receive and process signals from current transformer secondary circuits, ensuring reliable operation of protective devices to prevent equipment damage during network faults. 

Used in substations and high-voltage switchgear equipment:     

Device Functions:

AC circuits connect to main CT secondaries (1A or 5A rated), ensuring compatibility with various instrument transformers and proper relay protection operation.

The Cabinet Provides:

  • Current measurement data acquisition;
  • Data transmission to protection devices;
  • Selective tripping during faults;
  • Overload and short-circuit protection.

Equipment Composition:

  • Current measurement circuits;
  • Voltage measurement circuits;
  • Input/ Output protection circuits;
  • Control output circuits;
  • Signaling circuits;
  • Lighting/ power outlets.
Technical Specifications:
 
Pparameter:
 Value
Operational voltage  220V, DC
Lighting Circuit: 
AC voltage 220V
Frequency 50Hz
Measurement Circuits:
Rated current  5A
Rated voltage  100V
Connection:
Interface Ethernet: TX (RJ45)
Protocol Modbus IEC 60870-5-103
Environment:
Temperature (20 ± 5) °С
Humidity ≤80%

Cabinet Design:

Metal frame with separated compartments. Features:

  • Side terminal rows for external connections;
  • Front panel with protection terminals, controls and indicators;
  • Complies with ST RK GOST R 51321.1-2010.