Siemens siprotec 7SD5 User Manual

2 Functions
210
7SD5 Manual
C53000-G1176-C169-1
of the earth current and a time multiplier 3I0p Time Dial (IEC characteristic, Figure
2-89) or a time multiplier TimeDial TD3I0p (ANSI characteristic). A pre-selection of
the available characteristics was already carried out during the configuration of the
protection functions. Furthermore, an additional fixed delay Add.T-DELAY may be
selected. The characteristics are shown in the Technical Data.
Fig. 2-89 shows the logic diagram. The setting addresses of the IEC characteristics
are shown by way of an example. In the setting information the different setting ad-
dresses are described in detail.
It is also possible to implement this stage equally with a definite time delay. In this
case 3I0p PICKUP is the pickup threshold and Add.T-DELAY the definite time delay.
The inverse time characteristic is then effectively bypassed.
Figure 2-89 Logic diagram of the 3I
0P
stage (inverse time overcurrent protection), for example IEC characteristics
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English