Siemens 6MD85, Manual

Page: 809 / 1256

Parameter Value Description
1 out of 3
Use this 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).
3 out of 3
Select this setting when using the stage to disconnect from the power
system (in the case of wind farms, for example).
Parameter: Pickup delay
•
Default setting
(_:421:102) Pickup delay
=
no
The
Pickup delay
parameter is only available if you are using the current-flow criterion of the function
(parameter
Current-flow criterion
=
on
). If the current-flow criterion is deactivated, no pickup delay is
required.
With the
Pickup delay
parameter, you set whether pickup of the stage is to be delayed by approximately
40 ms or not. The delay avoids possible brief pickup of the stage when the circuit breaker opens.
Parameter Value Description
no
Use this setting if you definitely do not want stage pickup to be subject to a
time delay in the event of a fault. This setting results in pickup and, where
applicable, tripping being performed as quickly as possible.
Note that switching procedures (opening of the CB) can result in brief
pickup of the stage, depending on the threshold-value settings for under-
voltage pickup and the current-flow criterion. To prevent unwanted trip-
ping, you must set a minimum tripping delay of 50 ms.
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.
Settings
Addr. Parameter C Setting Options Default Setting
General
_:2311:104 General:Current-flow
criterion
•
off
•
on
on
_:2311:101 General:Threshold I> 1 A @ 100 Irated 0.030 A to 10.000 A 0.050 A
5 A @ 100 Irated 0.15 A to 50.00 A 0.25 A
1 A @ 50 Irated 0.030 A to 10.000 A 0.050 A
5 A @ 50 Irated 0.15 A to 50.00 A 0.25 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 0.050 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 0.250 A
Definite-T 1
_:421:1 Definite-T 1:Mode
•
off
•
on
•
test
off
_:421:2 Definite-T 1:Operate &
flt.rec. blocked
•
no
•
yes
no
_:421:10 Definite-T 1:Blk. by
meas.-volt. failure
•
no
•
yes
yes
_:421:9 Definite-T 1:Measured
value
•
phase-to-ground
•
phase-to-phase
phase-to-phase
7.16.5
Protection and Automation Functions
7.16 Undervoltage Protection with 3-Phase Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual 809
C53000-G5040-C015-9, Edition 11.2017