[7sj80-aktiv-cos-sin-empf-ef-070309, 1, en_US]
Figure 2-84 Activation of the sensitive ground-fault detection for cos-ϕ -/sin-ϕ measurement
Generation of a pickup message, for both current elements, is dependent on the direction selection for each
element and the setting of parameters 3130 PU CRITERIA. If the element is set to Non-Directional and
parameter PU CRITERIA = Vgnd OR INs, a pickup message is generated as soon as the current threshold is
exceeded, irrespective of the status of the V0 element. If, however, the setting of parameter PU CRITERIA is
Vgnd AND INs, the V
0
–element must have picked up also for non-directional mode.
However, if a direction is programmed, the current element must be picked up and the direction determina-
tion results must be present to generate a message. Once again, a condition for valid direction determination
is that the voltage element V
0
be picked up.
Parameter PU CRITERIA specifies, whether a fault is generated by means of the AND-function or the ORcom-
bination of displacement voltage and pickup of the ground current. The former may be advantageous if the
pickup setting of displacement voltage element V
0
was chosen to be very low.
Functions
2.13 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
204 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
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