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1.3.2 Biased Differential Characteristics
87BD I
87BD B
NITIAL
S
S
S
ETTING
LOPE
0.10
0.10
0.20
0.20
0.30
0.30
0.40
0.40
0.50
0.50
0.50
0.60
0.50
0.70
Selected Settings
Phase A Pickup
Phase B Pickup
Phase C Pickup
Table 5 - Biased Differential Characteristics
1.3.3 Inrush Inhibit Pickup
87 I
A
NRUSH
CTUAL
S
(
I
)
B
ETTING
X
LOCKING
D
L
EVEL
(
I
X
D
Table 6 - Inrush Inhibit
The tolerance for the Inrush Setting is ±10% of setting.
1.3.4 Differential Highset Pickup
P
A P
HASE
HASE
S
(
I
)
P
ETTING
X
ICKUP
N
Table 7 - Highset Differential Pickup
1.3.5 Restricted Earth Fault
T
F
EST
W1 REF Resistor
W1 REF Current
Setting
W1 Voltage Setting
W2 REF Resistor
W2 REF Current
Setting
W2 Voltage Setting
W3 REF Resistor
W3 REF Current
Setting
W3 Voltage Setting
Table 8 - Restricted Earth Fault
©2010 Siemens Protection Devices Limited
IAS
M
ETTING
EASURED ON
0.00
1.00
O
C
PERATE
URRENT
0.10
0.11
0.20
0.22
0.30
0.35
0.40
0.50
0.50
0.67
0.50
0.86
0.50
1.08
0.00
1.00
)
B P
C P
HASE
P
P
ICKUP
V
/S
ITTED
ALUE
ETTING
7SG14 Duobias-M-200 Commissioning
B
C
(
I
)
IAS
URRENT
X
N
A
A1
MMETER
1.50
2.00
M
A
EASURED ON
MMETER
0.16
0.21
0.33
0.44
0.53
0.71
0.75
1.00
1.00
1.33
1.29
1.71
1.62
2.15
Test Results
1.50
2.00
HASE
ICKUP
M
/
EASURED
P
ICKUP
2.50
A2
0.26
0.56
0.88
1.25
1.67
2.14
2.69
2.50
U
NITS
ohms
xIn
volts
ohms
xIn
volts
ohms
xIn
volts
Chapter 7 Page 17 of 20
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