ABB RELION REB500 Technical Manual page 68

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