ABB Relion 620 Series - Page 593

P
V
W≥ ≈
( )436
5900
32
2
Ω
(Equation 101)
Based on Equation 102 and Equation 103 , the need for voltage-dependent resistor is
checked.
U
A
kV
max
= + + ≈
25000
2000
5900 15 75 1 00 74 0( . . ) .Ω Ω Ω
(Equation 102)
˘
( ) .u V V V kV= ⋅ ⋅ ⋅ − ≈2 2 436 74000 436 16 0
(Equation 103)
The voltage-dependent resistor (one for each phase) is needed in this case as the
voltage during the fault is higher than 2 kV.
The leakage current through the VDR at the stabilizing voltage can be available from
the VDR manual, assuming that to be approximately 2 mA at stabilizing voltage
Iu A≈ 0 002.
(Equation 104)
The sensitivity of the protection can be recalculated taking into account the leakage
current through the VDR as per Equation 105 .
I A A A A
prim
= ⋅ + ⋅ + ≈2000 0 035 10 0 0034 0 002 142( . . . )
(Equation 105)
4.3.5.7 Signals
Table 510: HIAPDIF Input signals
Name Type Default Description
I_A SIGNAL 0 Phase A current
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
Table 511: HIBPDIF Input signals
Name
Type Default Description
I_B SIGNAL 0 Phase B current
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
1MRS757644 H Protection functions
620 series
Technical Manual
593