GE D60 Instruction Manual page 640
Line distance protection system
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Also See for D60:
- Instruction manual (826 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (708 pages)
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DISTANCE ELEMENTS
•
A ground element — I_0 × Z
•
B ground element — I_0 × Z
•
C ground element — I_0 × Z
The limit angle of the comparator is not adjustable and equals 90°. The zero-sequence directional characteristic improves
directional integrity for time-delayed operations after the memory expires.
9.1.3.12 Overcurrent supervision
The overcurrent supervision responds to the following currents:
•
AB phase element — (I
•
BC phase element — (I
•
CA phase element — (I
A, B, C ground element — | 3 × I_0 – 0.05 × I_1 |
•
The following tables summarize the characteristics of the distance elements.
Table 9-1: Directional mho phase distance functions
Characteristic
Variable mho
Reactance
Directional
Fault type
Table 9-2: Directional mho ground distance functions
Characteristic
Variable mho
Reactance
Directional
Directional
Fault-type
Zero-sequence
Table 9-3: Directional quadrilateral phase distance functions
Characteristic
Reactance
Directional
Right Blinder
Left Blinder
Fault type
Table 9-4: Directional quadrilateral ground distance functions
Characteristic
9
Reactance
Directional
Directional
Right Blinder
Left Blinder
9-6
and –V_0
D
and –V_0
D
and –V_0
D
– I
) /
A
B
– I
) /
B
C
– I
) /
C
A
Comparator inputs
I × Z – V
V_1M
I × Z – V
I × Z
I × ZD
V_1M
NOT SLG
See the Fault Type Characteristic section
Comparator inputs
I × Z – V
V_1M
I × Z – V
I_0 × Z
I_0 × Z
V_1M
D
I_2 × Z
V_1M
D
I_0
I_2
I_0 × Z
–V_0
D
Comparator inputs
I × Z – V
I × Z
I × Z
V_1M
D
I × Z
I × Z
– V
R
R
I × Z
I × Z
– V
L
L
NOT SLG
See the Fault Type Characteristic section
Comparator inputs
I × Z – V
j × I_0 × e
jΘ
× e
I_0 × Z
V_1M
D
I_2 × Z
V_1M
D
I × Z
I × Z
– V
R
R
I × Z
– V
I × Z
L
L
Limit angle
COMP LIMIT
COMP LIMIT
DIR COMP LIMIT
DIR COMP LIMIT (removed when 3I_0 > OC SUPV and I_2 < CUTOFF)
50° (removed during open pole conditions or when 3I_0 > OC SUPV
and I_2 < CUTOFF)
90° (zones 2 and higher only; removed for zones 2 and higher
during open pole conditions)
Limit angle
jΘ
or j × I_2
COMP LIMIT
DIR COMP LIMIT
DIR COMP LIMIT (removed when 3I_0 > OC SUPV and I_2 < CUTOFF)
90°
90°
D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 9: THEORY OF OPERATION
Limit angle
COMP LIMIT
COMP LIMIT
DIR COMP LIMIT
Removed during open pole conditions
Limit angle
COMP LIMIT
DIR COMP LIMIT
90°
90°
Removed during open pole conditions
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