ABB RED615 Product Manual page 9

ABB
Line Differential Protection and Control
RED615
Product version: 4.0
combination of binary 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
GUID-D4440C4D-6C02-4A37-A38B-1AEDCA9246FC V1 EN
Figure 4. Closed loop network configuration with RED615 line differential protection and control IEDs
Under certain operational circumstances, such as
maintenance of primary equipment or substation
extension projects there will be a need for
interconnecting network parts, which normally are
separated. To avoid major re-parameterization of
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.
the protection devices of the network when the
network topology is changed, line differential
protection IEDs can be used to obtain absolutely
selective feeder protection in looped networks.
1MRS756500 F
9