ABB Relion 650 Series Technical Manual page 607

1MRK 506 326-UUS B
Section 21
21.1 Application
In order to assure time selectivity between different overcurrent protections in different points in
the network different time delays for the different relays are normally used. The simplest way to
do this is to use definite time delay. In more sophisticated applications current dependent time
characteristics are used. Both alternatives are shown in a simple application with three
overcurrent protections connected in series.
IPickup
ANSI05000129 V1 EN-US
Figure 300: Three overcurrent protections connected in series
Time
IEC05000130 V1 EN-US
Figure 301: Definite time overcurrent characteristics
Line distance protection REL650
Technical manual
Time inverse characteristics
IPickup
Stage 2
Stage 1
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IPickup
Stage 3
Stage 2
Stage 1
Time inverse characteristics
GUID-E53AC2B7-C908-4FE9-A1F0-3052A6B3100F v1
xx05000129_ansi.vsd
Stage 1
Fault point
position
en05000130.vsd
Section 21
601