Section 22 Inverse time characteristics
About this chapter
This chapter describes current and voltage dependant time functionality. Both ANSI
and IEC Inverse time curves and tables are included.
22.1 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 563: Three overcurrent protections operating in series
1MRK505222-UUS C Section 22
Inverse time characteristics
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Technical reference manual
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