Siemens 7SJ82, Руководство пользователя

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Parameter:
Blk. by meas.-volt. failure
•
Recommended setting value
(_:12391:10) 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 one of the following 2 conditions is met:
•
The device-internal supervision function Measuring-voltage failure detection is configured and
enabled.
•
The binary input signal
>Open
of the function block
Voltage-transformer circuit breaker
is
linked with 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:
Detection of faulty phase
•
Default setting
(_:12391:109) Detection of faulty phase
=
no
The
Detection of faulty phase
parameter controls how the stage responds to determine which phase
is affected by the ground fault.
Parameter Value Description
no
The phase affected by the ground fault is not determined.
Select the default setting if you do not want to use the stage to detect
ground faults, for example for applications in grounded systems.
yes
After a pickup by the residual voltage, the device tries to determine which
phase is affected by the ground fault.
Select this setting for applications in isolated or arc-suppression-coil-
grounded systems.
Parameter:
V< faulty ph-to-gnd volt.
•
Default setting
(_:12391:104) V< faulty ph-to-gnd volt.
=
30 V
Set the threshold value for determining which phase is affected by the ground fault in the
V< faulty ph-
to-gnd volt.
parameter. The setting value is a phase-to-ground quantity.
The set value must be smaller than the minimum phase-to-ground voltage occurring during operation.
Siemens recommends using the default setting
V< faulty ph-to-gnd volt.
=
30 V
.
Parameter:
V> healthy ph-to-gnd volt.
•
Default setting
(_:12391:101) V> healthy ph-to-gnd volt.
=
70 V
Set the threshold value for the 2 healthy phases in the
V> healthy ph-to-gnd volt.
parameter. The
setting value is a phase-to-ground measurand.
The set value must be above the maximum phase-to-ground voltage occurring during operation, but below
the minimum phase-to-phase voltage present during operation. At V
rated
= 100 V, the value has to be set to 70
V, for example. Siemens recommends using the default setting
V> healthy ph-to-gnd volt.
=
70 V
.
Operation as Supervision Function
If you want the stage to have a reporting effect only, the generation of the operate indication and fault
logging can be disabled via the
Operate & flt.rec. blocked
parameter.
Protection and Automation Functions
6.15 Sensitive Ground-Fault Detection
SIPROTEC 5, Overcurrent Protection, Manual 611
C53000-G5040-C017-8, Edition 07.2017