Section 24
Inverse time characteristics
24.1
Application
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
Figure 325:
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
Figure 326:
Definite time overcurrent characteristics
1MRK 511 365-UUS A
Section 24
Inverse time characteristics
Phasor measurement unit RES670 2.1 ANSI
831
Technical manual
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