Section 26 Inverse time characteristics
26.1 Application
M16686-3 v5
In order to assure time selectivity between different overcurrent protections at different points in
the network different time delays for the different protections are normally used. The simplest
way to do this is to use definite time-lag. In more sophisticated applications current dependent
time characteristics are used. Both alternatives are shown in a simple application with three
overcurrent protections operating in series.
xx05000129_ansi.vsd
IPickup IPickup IPickup
ANSI05000129 V1 EN-US
Figure 700: Three overcurrent protections operating in series
en05000130.vsd
Time
Fault point
position
Stage 1
Stage 2
Stage 3
Stage 1
Stage 2
Stage 1
IEC05000130 V1 EN-US
Figure 701: Definite time overcurrent characteristics
1MRK 502 066-UUS B Section 26
Inverse time characteristics
1381
Technical manual
To Next Page
Loading...
