Settings - Siemens 7SJ82 Manual

Protection and Automation Functions
6.23 Overvoltage Protection with 3-Phase Voltage
Parameter Value
1 out of 3
3 out of 3
Parameter: Charact. constant k, Charact. constant α, Charact. constant c
•
Default setting (_:102) Charact. constant k = 1.00
•
Default setting (_:103) Charact. constant α = 1.000
•
Default setting (_:104) Charact. constant c = 0.000
With the parameters Charact. constant k, Charact. constant α, and Charact. constant c,
you define the required inverse-time characteristic curve.
Parameter: Time dial
•
Default setting (_:105) Time dial = 1.00
With the Time dial parameter, you displace the characteristic curve in the time direction.
As usually, there is no time grading for voltage protection and therefore no displacement of the characteristic
curve, Siemens recommends leaving the Time dial parameter at 1.00 (default setting).
Parameter: Additional time delay
•
Default setting (_:106) Additional time delay = 0.00 s
With the Additional time delay parameter, you define a definite-time delay in addition to the inverse-
time delay.
If the setting is left on its default value of 0 s, only the inverse-time delay is operative.
Parameter: Reset time
•
Default setting (_:107) Reset time = 0.00 s
With the Reset time parameter, you define the reset time delay which is started when the voltage falls
below the dropout threshold. Set the parameter Reset time to 0 s when instantaneous reset is desired.
Under network conditions of intermittent faults or faults which occur in rapid succession, Siemens recom-
mends setting the Reset time to an appropriate value (> 0 s) to ensure the operation. Otherwise Siemens
recommends to keep the default value to ensure a fast reset of the function.
6.23.4.3

Settings

Addr.
Inverse-T #
_:1
_:2
_:9
_:8
_:108
702
Description
Select the setting for protection applications or for monitoring the voltage
range.
Siemens recommends 1 out of 3 as the default setting. This reflects how
the function behaved in previous generations (SIPROTEC 4, SIPROTEC 3).
Select this setting when using the stage to disconnect from the power
system (in the case of wind farms, for example).
Parameter C
Inverse-T #:Mode
Inverse-T #:Operate &
flt.rec. blocked
Inverse-T #:Measured
value
Inverse-T #:Method of
measurement
Inverse-T #:Pickup mode
Setting Options
•
off
•
on
•
test
•
no
•
yes
•
phase-to-ground
•
phase-to-phase
•
fundamental comp.
•
RMS value
•
1 out of 3
•
3 out of 3
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Default Setting
off
no
phase-to-phase
fundamental
comp.
1 out of 3