P
V
W
≥
≈
(
)
436
5900
32
2
Ω
GUID-28EF2E18-E1A9-4332-B39B-56D3C1141F70 V1 EN
(Equation 100)
, the need for voltage-dependent resistor is
checked.
V
A
kV
max
=
+
+
≈
25000
2000
5900
15 75
1 00
74 0
(
.
.
)
.
Ω
Ω
Ω
GUID-385AE8B6-691A-42D0-8DAA-069769B90449 V1 EN
(Equation 101)
˘
(
)
.
u
V
V
V
kV
= ⋅
⋅
⋅
−
≈
2
2 436
74000
436
16 0
GUID-CBD7B53B-1E18-46EA-A6D7-CA3D6D1FDEC2 V2 EN
(Equation 102)
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
.
GUID-5E213E2C-39C4-4BC5-A8B7-514B599B0976 V1 EN
(Equation 103)
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
( .
.
.
)
GUID-1C855302-2D84-4B81-8DD8-EC3B1EAE1315 V2 EN
(Equation 104)
4.3.4.7
Signals
Table 451:
87A Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
Table 452:
87B Input signals
Name
Type
Default
Description
I_B
SIGNAL
0
Phase B current
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
Section 4
1MAC059074-MB A
Protection functions
564
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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