Circuit Breaker Failure Protection
129
7SS52 V4 Manual
C53000-G1176-C182-3
BF OP MODE The parameter BF OP MODE (XX15/CU) is used to select the operating mode for the
breaker failure protection in the bay unit. The parameter setting depends on the pro-
tection concept in use.
With setting non existent the breaker failure protection will be deactivated.
With setting I>query the I> query mode is activated.
With setting trip rep/I>quer the TRIP repetition with subsequent I> query mode
is activated.
With setting BZ unbalance the unbalancing mode is activated.
With setting trip rep/unbal the TRIP repetition with subsequent unbalancing
mode is activated.
With setting external the breaker failure protection will be provided by an external
device.
BF I< The parameter BF I< (XX16/CU) is used to activate and deactivate the low-current
mode.
With setting ON the low-current mode is activated.
With setting OFF the low-current mode is deactivated.
The low-current mode can be used together with the following settings:
• BF BI MODE (XX14/CU) with and without supervision
• BF OP MODE (XX15/CU) Breaker failure operating mode, in the settings:
− I> query
− TRIP repetition/I> query:
− Unbalancing
− TRIP repetition/Unbalancing
The low-current mode cannot be used together with the following setting external
of the parameter BF OP MODE (XX15/CU).
Note:
With the mode I> Query the dropout time (measuring window) of the breaker failure pro-
tection of 25 ms must be considered for setting the times T-BF-1P (XX20/CU) and
T-BF-mP (XX12/CU).
With the mode
BZ Unbalance the dropout time is 2 ms and need not be taken into con-
sideration for setting the times T-BF-1P (XX20/CU) and T-BF-mP (XX21/CU).
www . ElectricalPartManuals . com
To Next Page
Loading...
Need help?
General
