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