1MRS756378 D
Section 2
2.1
REF615
Application Manual
REF615 overview
Overview
REF615 is a native IEC 61850 feeder protection IED for selective short-circuit,
overcurrent and earth-fault protection. It is applicable to all types of radial isolated
neutral networks, resistant earthed networks and compensated networks. REF615 is
part of a product family that will cover many protection applications for utility and
industry customers.
The IED features draw-out-type design, compact size and ease of use. Depending on
the IED variant, the protection functions may include:
•
Three-phase non-directional overcurrent protection, 4 stages
•
Three-phase directional overcurrent, 3 stages
•
Directional earth-fault protection, 3 stages
•
Non-directional (cross-country) earth fault, using calculated I
•
Non-directional earth fault, 3 stages
•
Transient/intermittent earth-fault protection
•
Non-directional sensitive earth fault
•
Negative-sequence overcurrent protection, 2 stages
•
Phase discontinuity
•
Three-phase overvoltage protection, 3 stages
•
Positive-sequence undervoltage protection
•
Negative-sequence overvoltage protection
•
Residual overvoltage protection, 3 stages
•
Three-phase undervoltage protection, 3 stages
•
Three-phase transformer inrush detector
•
Three-phase thermal overload, lines and cables
•
Circuit-breaker failure protection
•
Electrically latched lockout relay
Depending on the IED variant, the optional functions may include:
•
Auto-reclose
•
Arc protection, three lens sensors for arc detection
Section 2
REF615 overview
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