Siemens 7SJ82, Manual

Page: 618 / 1638

Application and Setting Notes
Parameter:
Operate & flt.rec. blocked
•
Default setting
(_:2) Operate & flt.rec. blocked
=
no
You can block the operate indication, the fault recording, and the fault log with the
Operate & flt.rec.
blocked
parameter. In this case, a ground-fault log is created instead of the fault log.
Parameter:
Blk. by meas.-volt. failure
•
Recommended setting value
(_:10) Blk. by meas.-volt. failure
=
yes
You use the
Blk. by meas.-volt. failure
parameter to control the behavior of the stage when a
measuring-voltage failure is detected. A measuring-voltage failure can only be detected if 1 of the following 2
conditions is met:
•
The device-internal supervision function Measuring-voltage failure detection is configured and
switched on.
•
The binary input signal
>Open
of the function block Voltage-transformer circuit breaker is connected to
the voltage-transformer circuit breaker.
Parameter Value Description
yes
The protection stage is blocked (= default setting).
Siemens recommends using the default setting.
no
The protection stage is not blocked.
Parameter:
Blk. w. inrush curr. detect.
•
Default setting
(_:27) Blk. w. inrush curr. detect.
=
no
With the
Blk. w. inrush curr. detect.
parameter, you determine whether the operate is blocked
during the detection of an inrush current.
Parameter:
V0> threshold value
•
Default setting
(_:101) V0> threshold value
=
5.000 V
The
V0> threshold value
parameter allows you to set the zero-sequence voltage sensitivity of the stage.
The threshold value must be smaller than the minimum amount of the zero-sequence voltage V0 which must
still be detected.
Parameter:
Threshold Y0>
•
Default setting
(_:102) Threshold Y0>
=
2.00 mS
With the parameter
Threshold Y0>
, you set the threshold value of the ground admittance Y0. If the ground
admittance for the setting value is unknown, you can assume the following relation:
[fo_SeGfY0-270614-01, 2, en_US]
k
s
Factor, takes into account the ohmic components of the current
(1.2 for overhead lines, 1.0 to 1.05 for cable systems)
I
c,line
Secondary capacitive ground-fault current for the protected line
V
ph-gnd
Secondary phase-to-ground voltage in the healthy case
3I
0min
Secondary ground current in the healthy case (resulting from transformer error),
5 mA to 10 mA (core balance current transformer), 50 mA to 100 mA (Holmgreen transformer)
V0> Secondary pickup threshold of the residual voltage
6.15.12.2
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
618 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017