GE T35 | Transformer Protection System

GE T35 | Transformer Protection System

GE T35 | Transformer Protection System

Cost-effective differential protection for transformers with up to 6 sets of CTs The T35 is designed to provide basic transformer protection functions for variety of transformer applications. It uses multiple current inputs to provide primary protection and backup protection of transformers, including differential, phase and ground overcurrent. The relay can be configured to accept up to 6 sets of current inputs to provide proper differential restraint for applications with three-winding transformers with windings configured in dual-breaker arrangements.


  • Combined protection for transformer and small bus zone, including breaker-and-a-half and ring bus diameters
  • Stand-alone or component in automated substation control system
  • Primary and backup protection of power transformers, autotransformers, reactors, split-phase and angle regulating transformers
  • Advanced data logging for asset management and maintenance optimization

Key Benefits

  • Secure high-speed transformer differential protection with advanced features in a cost-effective package
  • Improved security for transformer energization and inrush provided through a superior adaptive 2nd harmonic restraint algorithm
  • Application flexibility for transformers with up to 6 sets of CTs, with independent magnitude/phase angle compensation and grounding settings
  • Advanced automation capabilities for providing customized protection and control solutions
  • Three independent fiber or copper Ethernet ports for simultaneous/ dedicated network connections with advanced 1 microsecond time synchronization via LAN with IEEE® 1588 support
  • Reduced relay-to-relay wiring and associated installation costs through high-speed inter-relay communications
  • Increase network availability by reducing failover time to zero through IEC® 62439-3 "PRP" support
  • CyberSentry™ provides high-end cyber security aligned to industry standards and services (NERC® CIP, AAA, Radius, RBAC, Syslog)
  • Advanced fault and disturbance recording, including internal relay operating signals, eliminating the need for redundant recording devices
  • Complete IEC 61850 Process Bus solution provides resource optimization and minimizes total P&C life cycle costs

Functional Block Diagram

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