Solutions   for   Protecting   andManaging   the   Electrical   Network

DTT 7031

Transformer Differential Protection STATIC RANGE

The DTT7031 is a biased three phase differential relay designed to protect high voltage transformers against internal faults. Its very rapid operation limits the damage due to short circuits between phases, between turns on the same phase, or between windings and earth/ground if the earth/ground currents can attain relatively high values.
The DTT7031 is supplied in a plug-in modular case type R4.

PROTECTION   Functions

  • Differential Protection [87]


  • Differential Unit Settings: Low threshold: 20-50% In; High threshold: 5-20 In
  • Trip time: Low threshold: 50msec; High threshold: 40msec
  • 2 output units
  • Mechanical operation flag with hand reset


  Device Doc. Type Lang. Ref. Index
DTT 7031 Leaflet EN / FR -- --
DTT 7031 User Manual EN M.1739 C
DTT 7031 User Manual IT MI.1739 B
DTT 7031 Connection/Definition Diagram -- 9321 C