M-3311A Transformer Protection (2, 3, or 4-Winding) Relay

Protect Transformers and Other Important Power System Apparatus.

For Transformers of All Sizes:

2, 3 or 4 winding Transformers for Transmission and Distribution applications

Generator-Transformer Unit Overall Differential

Unit Protection of Other Electrical Apparatus and certain Bus Arrangements (including those with a transformer in the zone)

Additional Applications:

System Backup Protection

Load Shedding (voltage and frequency)

Bus Protection

Individual Breaker Failure Protection for each winding input

Available voltage configurations include zero, two or four voltage inputs

Ground Differential configurations include one, two or three current inputs

Optional Ethernet Connection and Expanded I/O

Optional Voltage Package includes:

24 Volts/Hz Overexcitation

27 Phase Undervoltage

59G Ground Overvoltage

81O/U Over/Under Frequency