U
L1
, U
L2
, U
L3
, U
E
I
L1
, I
L2
, I
L3
, I
E
START
N
N
Y
Y
END
Signals
Stop timers
N
Trip
Reset signals
Selectivity
conditions
Y
Solidly grounded
system AND
(I > starting active)
Calculat six Z
(Ph-0 compensated)
Reset
conditions
Signals,
Fault location,
Z(loop)
I
start
, UZ starters
Select phases
Ph-E
N
Y
Calculat three
Z Ph-Ph
Calculate Z Ph-0
Z
Start
, Z
1-4
, (Z
OR
),
Z
Back
, direction
18000015-IEC19000417-1-en.vsdx
IEC19000417 V1 EN-US
Figure 16: Processing period II
Directional decision
GUID-10744C55-5A70-473E-84CF-B1D445573981 v1
Before deciding the direction of a fault, the fault voltage (used as reference voltage) is checked
to determine whether it is higher than the setting of the parameter
UKmin (minimum fault
Section 5
1MRK 505 406-UEN B
Bay protection functions
62
Bay protection functions REB500
Technical manual
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