Transformer Protection System

The T35 is designed to provide basic transformer protection functions for a 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.

Key Benefits

• Secure high-speed transformer differential protection in a cost-effective package
• Improved security for transformer energization and inrush
• Application flexibility for transformers with up to 6 sets of CTs
• Robust network security enabling Critical Infrastructure Protection
• Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and flexible process bus support (IEC 61850-9-2LE, IEC 61869 or IEC 61850-9-2 Hardfiber) ensures interoperability, device managing optimization, and reduced cost of ownership
• Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications
• Advanced Cybersecurity features “CyberSentryTM” that help meet modern industry requirements
• Application flexibility with multiple I/O options including high-density I/O, programmable logic, modularity, and specific customization
• An integrated large, full-color display provides real-time visualization and control of the protected bay, via a bay mimic as well as annunciator functionality and graphical visualization of phasors

Applications

• Combined protection for transformer and small bus zone, including breaker-and-a-half and ring bus configurations
• Stand-alone or component in automated substation control systems
• Applicable for transformers with windings in a ring bus or breaker-and-a-half configuration