Settings - Siemens 6MD85 Manual

Protection and Automation Functions
7.16 Undervoltage Protection with 3-Phase Voltage
Parameter Value
yes
Parameter: Charact. constant k, Charact. constant α, Charact. constant c
•
Default setting (_:103) Charact. constant k = 1.00
•
Default setting (_:104) Charact. constant α = 1.000
•
Default setting (_:105) Charact. constant c = 0.000
With the Charact. constant k, Charact. constant α, and Charact. constant c parameters,
you define the required inverse-time characteristic.
Parameter: Time dial
•
Default setting (_:106) 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: Reset time
•
Default setting (_:108) Reset time = 0.00 s
With the Reset time parameter, you define the reset time delay which is started when the voltage exceeds
the dropout value. 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 keeping the default value to ensure a fast reset of the function.
Parameter: Additional time delay
•
Default setting (_:107) 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.

Settings

7.16.9
Addr.
Inverse-T #
_:1
_:2
_:10
_:9
_:8
816
Description
Use this setting when switching procedures (opening of the CB) are not
permitted to result in stage pickup.
Note that pickup is delayed by approximately 40 ms. This delay is added to
the operate time.
Parameter C
Inverse-T #:Mode
Inverse-T #:Operate &
flt.rec. blocked
Inverse-T #:Blk. by
meas.-volt. failure
Inverse-T #:Measured
value
Inverse-T #:Method of
measurement
Setting Options
•
off
•
on
•
test
•
no
•
yes
•
no
•
yes
•
phase-to-ground
•
phase-to-phase
•
fundamental comp.
•
RMS value
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Default Setting
off
no
yes
phase-to-phase
fundamental
comp.