Application - ABB RED615 Product Manual

ABB
Line Differential Protection and Control
RED615
Product version: 1.1

4. Application

RED615 can be used in a variety of applica-
tions requiring an absolutely selective unit
type protection system. The zone-of-protec-
tion 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 communica-
tion over a station bus and binary signal
transfer over the protection communication
link offers new application possibilities be-
yond traditional line differential protection.
One interesting application based on inter-
substation signal transfer is loss-of-mains
(LOM) protection in networks with distrib-
uted generation. The performance of the
Fig. 2 Closed loop network configuration with RED615 line differential protection
and control IEDs
combination of binary signal transfer and
horizontal GOOSE communication perform-
ance 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 condi-
tions 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 pro-
tection, either directional or non-directional,
it is difficult to obtain fast and selective short
circuit protection. With RED615 line differ-
ential protection IEDs the faulty part of the
network can be selectively isolated, thus se-
curing power distribution to the healthy part
of the network.
1MRS756500 A