Section 5 1MRK 505 350-UEN
Additional protection options
44 Technical Manual
Distributed busbar protection REB500
• By enabling “Connect phase start signals” all logical start signals for the BFP
phase system will be used to initiate the timer of the BFP L0 function.
• With “Time step t1 L0” the setting for timer t
1
-L0 is made.
For considerations on the different possibilities to connect the BFP
L0 system refer to the Application Manual.
5.3 Overcurrent definite time protection
5.3.1 Mode of operation
The overcurrent protection (def. time) function operates entirely independently of
the other protection functions in each of the bay units and does not intertrip the
respective busbar protection zone.
Figure 13 Block diagram of the overcurrent protection
35220_ Block OCDT (CU)
15210_Block OCDT
I > setting
1
I >
setting
I > setting
I < setting * RR
I <setting * RR
I < setting * RR
45805_OCDT Start (CU)
25105_OCDT TRIP
25305_OCDT trip
43305_OCDT trip (CU)
OCDT blocked
25405_OCDT blocked
45405_ OCDT blocked (CU)
OCDT delay
1)
1)
1)
1) RR = reset ratio (OCDT)
Typical setting 0.95 when engineering scheme
R
S
Timer
&
L1
L2
L3
L1
L2
L3
1
25805_OCDT Start
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