Siemens 6MD86 - Page 398

[sc_FB0_adj_comm, 1, en_US]
Figure 6-87 General Block for Syn./Asy.Bal. Stage in the DIGSI Setting Sheet
If you want to switch the generator to a dead busbar (black start), Siemens recommends keeping the default
values and controlling the release via the binary input signal (_:506) >Op. mode 'V1<V2>' .
The preset voltage ranges V1 < 5 V (dead busbar) and V2 > 80 V (live generator) are tested only once the
binary input signal (_:506) >Op. mode 'V1<V2>' is active. Siemens recommends this procedure.
If you set the parameter (_:105) Close cmd. at V1< & V2> = yes, on the other hand, the voltage
ranges are tested automatically once synchronization has started. The condition V1 < 5 V is met if the voltage
is really 0 V or in case of an interruption.
In case of an interruption, the current voltage state of the busbar is unknown and there is a risk of wrong
synchronization. In this case, you can increase safety with the following measures:
•
The operational crew deliberately releases synchronization.
•
Alternatively, you can control release via a redundant 2nd channel. If V1 < 5 V (dead busbar), the binary
input signal
(_:506) >Op. mode 'V1<V2>' is active.
[sc_FB_spglos_sch, 1, en_US]
Figure 6-88 De-en.gized Switch. Block for Syn./Asy.Bal. Stage in the DIGSI Setting Sheet
i
i
NOTE
In the black-start application, a 3-phase voltage connection provides the advantage that all voltages are
monitored. This increases the safety of this application.
Parameters: Sync. operating mode, Async. operating mode
•
Default setting (_:119) Sync. operating mode = off
•
Default setting (_:114) Async. operating mode = off
With these parameters, you can switch the operating mode of the stage on or off individually. The operating
modes are deactivated in the default setting for safety reasons. Switch the Async. operating mode = on.
You can find possible combinations of operating modes in chapter 6.4.8.2 Application and Setting Notes.
Parameter for Asynchronous Operation: Maximum Differential Values for Voltage and Frequency
•
Default setting (_:113) CB make time = 0.06 s
•
Default setting (_:115) Max. voltage diff. V2>V1 = 2.0 V
•
Default setting (_:116) Max. voltage diff. V2<V1 = 2.0 V
Control Functions
6.4 Synchronization Function
398 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017