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ABB REF615 L User Manual

ABB REF615 L
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GUID-64A6AADE-275F-43DA-B7D9-2B1340166A4D V2 EN
Figure 198: Line differential applications
Communication supervision
A typical line differential protection application includes LNPLDF as the main
protection. Backup over current functions is needed if a protection communication
failure occurs. When the communication supervision function detects a failure in
the communication between the protective units, the safe operation of the line is
still guaranteed by blocking the line differential protection and unblocking the over
current functions.
When a communication failure is detected, the protection communication
supervision function issues block for the LNPLDF line differential protection and
unblock for the instantaneous and high stages (instance 2) of the over current
protection. These are used to give backup protection for the remote end feeder
protection IED. In situations where the selectivity is weaker than usually, the
protection should still be available for the system.
1YHT530004D05 D Section 4
Protection functions
615 series 375
Technical Manual

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ABB REF615 L Specifications

General IconGeneral
TypeFeeder Protection Relay
Rated Frequency50/60 Hz
WeightApprox. 1.5 kg
Communication ProtocolsIEC 61850, Modbus RTU, DNP3
Protection FunctionsOvercurrent, Earth fault, Thermal overload, Under/Over voltage, Under/Over frequency
EnclosureIP20

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