Siemens 6MD85, Manual

Page: 816 / 1256

Parameter Value Description
yes
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:
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
Addr. Parameter C Setting Options Default Setting
Inverse-T #
_:1 Inverse-T #:Mode
•
off
•
on
•
test
off
_:2 Inverse-T #:Operate &
flt.rec. blocked
•
no
•
yes
no
_:10 Inverse-T #:Blk. by
meas.-volt. failure
•
no
•
yes
yes
_:9 Inverse-T #:Measured
value
•
phase-to-ground
•
phase-to-phase
phase-to-phase
_:8 Inverse-T #:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
7.16.9
Protection and Automation Functions
7.16 Undervoltage Protection with 3-Phase Voltage
816 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017