Extended Ground Fault Protection Eptr/Tnp; General Information - Siemens SIPROTEC 4 Manual

Functions
2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
[7sj80-erdfehler-iee-u0-i0-messung-20061206, 1, en_US]
Figure 2-77

Extended Ground Fault Protection EPTR/TNP

2.12.3
2.12.3.1

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.
182
Logic diagram for V0-/I0 -ϕ measurement, part 2
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017