Siemens SIPROTEC 7SJ62 Instruction Manual

Functions
6-477SJ62 Manual
C53000-G1140-C121-1
Figure 6-23 Voltages Used for Direction Determination
Table 6-2 shows the assignment of voltage and current values for the determination of fault di-
rection for various types of short-circuit faults.
1
) or 3 * V
0
= V
ag
+ V
bg
+ V
cg
, depending on type of connection for the voltages
The direction curve for the directional phase relay element is shown in Figure 6-24 in
a complex R-X diagram. The curve illustrates the operating direction of the relay in
terms of the impedance viewed by the directional phase relay element, that is, the ratio
of the directional phase element polarizing voltage to the directional phase element
current. Line ‘a’ represents the directional limit line, and when the protective relay
V
CA
V
AB
V
A
V
C
V
B
V
BC
V
BC
V
C
V
B
A
V
a) Phase to Ground Fault (a-g) b) Phase to Phase Fault (a-c)
Table 6-2 Voltage and Current Values for the Determination of Fault Direction
ABCGROUND
Pick up Current Voltage Current Voltage Current Voltage Current Voltage
AIaV
bc
BI
b
V
ca
CI
c
V
ab
G I
0
V
0
1
)
A, G Ia V
bc
I
0
V
0
1
)
B, G I
b
V
ca
I
0
V
0
1
)
C, G I
c
V
ab
I
0
V
0
1
)
A, B Ia V
bc
I
b
V
ca
B, C I
b
V
ca
I
c
V
ab
C, A Ia V
bc
I
c
V
ab
A, B, G Ia V
bc
I
b
V
ca
I
0
V
0
1
)
B, C, G I
b
V
ca
I
c
V
ab
I
0
V
0
1
)
C, A, G Ia V
bc
I
c
V
ab
I
0
V
0
1
)
A, B, C Ia V
bc
I
b
V
ca
I
c
V
ab
A, B, C, G Ia V
bc
I
b
V
ca
I
c
V
ab
I
0
V
0
1
)
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English