GE D30 Instruction Manual page 445
Line distance protection system, ur series
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- Instruction manual (686 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (636 pages)
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8 THEORY OF OPERATION
X
MHO CHARACTERISTIC
c) NON-DIRECTIONAL MHO CHARACTERISTIC
The non-directional mho characteristic is achieved by checking the angle between:
•
AB phase element: (I
– I
A
•
BC phase element: (I
– I
B
•
CA phase element: (I
– I
C
•
A ground element:
× Z + I_0 × K0 × Z + I
I
A
G
•
B ground element:
× Z + I_0 × K0 × Z + I
I
B
G
•
C ground element:
I
× Z + I_0 × K0 × Z + I
C
G
d) MHO REACTANCE CHARACTERISTIC FOR DIRECTIONAL APPLICATIONS
The reactance characteristic is achieved by checking the angle between:
•
AB phase element: (I
– I
A
•
BC phase element: (I
– I
B
•
CA phase element: (I
– I
C
× Z + I_0 × K0 × Z + I
•
A ground element: I
A
× Z + I_0 × K0 × Z + I
•
B ground element: I
B
× Z + I_0 × K0 × Z + I
•
C ground element: I
C
If the mho characteristic is selected, the limit angle of the comparator is adjustable concurrently with the limit angle of the
mho characteristic, resulting in a tent shape complementing the lens characteristic being effectively applied.
e) QUADRILATERAL REACTANCE CHARACTERISTIC FOR DIRECTIONAL APPLICATIONS
The quadrilateral reactance characteristic is achieved by checking the angle between:
•
AB phase element: (I
– I
A
•
BC phase element: (I
– I
B
•
CA phase element: (I
– I
C
× Z + I_0 × K0 × Z + I
•
A ground element: I
A
× Z + I_0 × K0 × Z + I
•
B ground element: I
B
•
C ground element: I
× Z + I_0 × K0 × Z + I
C
GE Multilin
Reach setting
Comparator angle setting= 90
R
837715A2.CDR
Figure 8–1: MHO AND LENS CHARACTERISTICS
) × Z – (V
– V
)
and
(V
B
A
B
A
) × Z – (V
– V
)
and
(V
C
B
C
) × Z – (V
– V
)
and
(V
A
C
A
× K0M × Z – V
and
V
– (I
A
A
× K0M × Z – V
and
V
– (I
B
B
× K0M × Z – V
and
V
– (I
C
C
) × Z – (V
– V
)
and
(I
B
A
B
A
) × Z – (V
– V
)
and
(I
C
B
C
B
) × Z – (V
– V
)
and
(I
A
C
A
C
× K0M × Z – V
G
× K0M × Z – V
G
× K0M × Z – V
G
) × Z – (V
– V
)
and
(I
B
A
B
A
) × Z – (V
– V
)
and
(I
C
B
C
B
) × Z – (V
– V
)
and
(I
A
C
A
C
× K0M × Z – V
G
× K0M × Z – V
G
× K0M × Z – V
G
D30 Line Distance Protection System
X
LENS CHARACTERISTIC
) × Z
– V
) – (I
– I
B
A
B
REV
) × Z
– V
) – (I
– I
B
C
B
C
REV
) × Z
– V
) – (I
– I
C
A
C
A
REV
× Z
+ I_0 × K0 × Z
A
REV
REV
× Z
+ I_0 × K0 × Z
B
REV
REV
× Z
+ I_0 × K0 × Z
C
REV
REV
– I
) × Z.
B
– I
) × Z.
C
) × Z.
– I
A
I_0 × Z.
and
A
I_0 × Z.
and
B
I_0 × Z.
and
C
– I
) × Z.
B
– I
) × Z.
C
) × Z.
– I
A
(j × I_0 or j × I_2A) × e
and
A
(j × I_0 or j × I_2B) × e
and
B
and
(j × I_0 or j × I_2C) × e
C
8.1 DISTANCE ELEMENTS
Reach setting
Comparator angle setting < 90
R
837714A2.CDR
× K0M × Z
+ I
)
G
REV
× K0M × Z
+ I
)
G
REV
+ I
× K0M × Z
)
G
REV
jΘ
.
jΘ
.
jΘ
.
8
8-3
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