ABB RET615 Product Manual page 4

Transformer Protection and Control
RET615
Product version: 4.0
Table 2. Supported functions
Functionality
1)
Protection
Stabilized and instantaneous differential
protection for two-winding transformers
Multi-purpose protection, instance 1
Multi-purpose protection, instance 2
Multi-purpose protection, instance 3
Multi-purpose protection, instance 4
Multi-purpose protection, instance 5
Multi-purpose protection, instance 6
Master trip, instance 1
Master trip, instance 2
HV-side protection
Numerical stabilized low impedance restricted
earth-fault protection
High impedance based restricted earth-fault
protection
Three-phase non-directional overcurrent
protection, low stage, instance 1
Three-phase non-directional overcurrent
protection, high stage, instance 1
Three-phase non-directional overcurrent
protection, instantaneous stage, instance 1
Non-directional earth-fault protection, low
stage, instance 1
Non-directional earth-fault protection, high
stage, instance 1
Negative-sequence overcurrent protection,
instance 1
Residual overvoltage protection, instance 1
Residual overvoltage protection, instance 2
Three-phase undervoltage protection, instance
1
Three-phase undervoltage protection, instance
2
Three-phase overvoltage protection, instance 1
Three-phase overvoltage protection, instance 2
Three-phase thermal overload protection for
power transformers, two time constants
4
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ABB