Section 19
Time inverse characteristics
19.1
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.
xx05000129_ansi.vsd
IPickup
IPickup
IPickup
ANSI05000129 V1 EN
Figure 175:
Three overcurrent protections connected in series
en05000130.vsd
Time
Fault point
position
Stage 1
Stage 2
Stage 3
Stage 1
Stage 2
Stage 1
IEC05000130 V1 EN
Figure 176:
Definite time overcurrent characteristics
1MRK 505 277-UUS C
Section 19
Time inverse characteristics
459
Technical Manual
Summary of Contents for REB650
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