Application - ABB RED615 Product Manual

ABB
Line Differential Protection and Control
RED615
Product version: 2.0
Figure 3. Protection function overview of standard configuration C

4. Application

RED615 can be used in a variety of
applications requiring an absolutely selective
unit type protection system. The zone-of-
protection of a line differential protection
system is the feeder section defined by the
location of the current transformers in the
local and the remote substation.
Combining horizontal GOOSE
communication over a station bus and binary
signal transfer over the protection
communication link offers new application
possibilities beyond traditional line
differential protection. One interesting
application based on inter-substation signal
transfer is loss-of-mains (LOM) protection in
networks with distributed generation. The
performance of the combination of binary
GUID-4F4A066F-28C1-40FB-B3A6-B2CC3119E587 V1 EN
signal transfer and horizontal GOOSE
communication performance as to speed,
selectivity and reliability are hard to match
with conventional loss-of-mains protection.
RED615 is the ideal IED for the protection of
feeders in network configurations containing
closed loops. Under normal operating
conditions the feeder loop is closed. The aim
of the closed loop is to secure the availability
of power for the end users. As a result of the
closed loop configuration, any fault spot in
the system will be fed with fault current from
two directions. Using plain overcurrent
protection, either directional or non-
directional, it is difficult to obtain fast and
selective short circuit protection. With
RED615 line differential protection IEDs the
faulty part of the network can be selectively
isolated, thus securing power distribution to
the healthy part of the network.
1MRS756500 B
Issued: 03.07.2009
7