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Functions
2.13 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
[ortung-des-erdschlusses-260602-kn, 1, en_US]
Figure 2-93
Setting Notes
2.13.4
General Settings
During configuration of the protection functions (Section
Gnd Fault it was determined with which parameters the ground fault detection is functioning.
If address Sens. Gnd Fault = Definite Time is selected, then the settings for the definite-time
elements are available here.
If address Sens. Gnd Fault = Log. inverse A is set, a logarithmic inverse time characteristic is avail-
able.
If address Sens. Gnd Fault = Log. Inverse B is set, a logarithmic inverse time characteristic with knee
point is active.
If Sens. Gnd Fault = User Defined PU is selected, a user-specified characteristic can be used for the
overcurrent protection elements 50Ns-1 or 51Ns.
If Sens. Gnd Fault = TOC IEC or Sens. Gnd Fault = TOC ANSI is selected, you can use an inverse
time characteristic either according to the IEC- or the ANSI-standard.
The superimposed high-current element 50Ns-1 is available in all these cases.
If this function is not required, then Disabled is set.
The logarithmic inverse time characteristics, the characteristics according to IEC or ANSI standards and user
characteristics are only available if under address 130 the standard measurement method cos φ / sin φ is
set.
The characteristic for determining the direction is set at address 130 S.Gnd.F.Dir.Ch. It is optional to select
either the standard measurement method cos φ / sin φ or the V0/I0 φ mea. with one sector charac-
teristic.
At address 3101 Sens. Gnd Fault, the function ON or OFF can be set to either ON with GF log or
Alarm Only. If settings ON and ON with GF log are applied, tripping is also possible, otherwise a fault log
is created. A ground fault log is created for ON with GF log and Alarm Only. Setting ON with GF log
is only available if characteristic V0/I0 φ mea. has been selected at address 130 S.Gnd.F.Dir.Ch.
The parameters 3111 T-DELAY Pickup and 3130 PU CRITERIA are only visible if the standard measure-
ment method cos φ / sin φ has been selected when setting the direction characteristic. The ground fault
is detected and reported when the displacement voltage was sustained a certain time T-DELAY Pickup).
Address 3130 PU CRITERIA specifies whether ground fault detection is enabled only for pickups of V
(Vgnd AND INs) or as soon as one of the two has picked up (Vgnd OR INs).
Ι
NS
The pickup can be stabilized for ground fault protection with definite time curve by a settable dropout time
delay (address 3121 50Ns T DROP-OUT). This facility is used in power systems with intermittent faults. Used
together with electro-mechanical relays, it allows different dropout responses to be adjusted and time grading
of digital and electro-magnetic relays to be implemented. The setting depends on the dropout time delay of
212
Determination of the ground fault location basing on directional indicators in the meshed
system
2.1.1 Functional
Scope, under address 131 Sens.
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
and
N
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