The 745 Transformer Protection System is a full featured transformer protection relay, suitable for application on small, medium, and large power transformers. The 745 can be applied on two-winding and three-winding transformers. Uses multiple current and voltage inputs to provide primary protection and back-up protection of transformers, including differential, ground differential phase, neutral, and ground overcurrent, over-fluxing, and on-load tap changer.
Key Benefits
Easy to use Transformer Protection supported by industry leading suite of software tools
Improved security for transformer energization
Accurate built-in metering functions
Advanced FlexLogic automation capabilities
Fast, flexible and reliable communications
IRIG-B time synchronization, event reports, waveform capture, data logger
Key Benefits (Cont.)
Built in simulation features for setpoint verification
Modbus and DNP 3.0 Level 2 protocols through embedded Ethernet, standard RS232, RS485 & RS422 serial ports.
Optional conformal coating for chemically corrosive and humid environments
Security Audit Trail provides detailed traceability for system configuration changes
Minimize maintenance time with draw-out capability
Applications
Primary and back-up protection and management of small, medium and larger power transformers, autotransformers and reactors
Transformer asset monitoring using Hottest Spot, Loss-of-Life and Aging Factor
Stand-alone or component in automated substation control system
Protection & Control
Variable dual-slope percent differential protection
Magnetizing inrush and overexcitation blocking
Phase & ground overcurrent elements
Adaptive time overcurrent using FlexCurves elements
Underfrequency/Overfrequency Protection
Frequency rate-of-change Detection
Overexcitation (V/Hz) Protection
Restricted Ground Fault Protection
Transformer overload protection
