[7sj80-erdfehler-iee-u0-i0-messung-20061206, 1, en_US]
Figure 2-77
Logic diagram for V0-/I0 -ϕ measurement, part 2
Extended Ground Fault Protection EPTR/TNP
General Information
Additionally to the sensitive and non-sensitive ground-fault detection, the 7SJ80 device offers further func-
tions for detecting ground faults in the 20-kV power system.
•
Protection against ground faults in grounded feeders (EPTR)
•
Protection against thermal overload of transformers with grounded neutral point (TNP)
The functions can only be used as an alternative. They work independently from the setting of address 130
S.Gnd.F.Dir.Ch.
The following figure shows the used input variables and the activation criteria of the functions.
2.12.3
2.12.3.1
Functions
2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
182 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
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