P
V
W
≥
≈
(
)
436
5900
32
2
Ω
(Equation 101)
, 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
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
