GE D90 Plus Instruction Manual page 555
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (662 pages)
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CHAPTER 15: THEORY OF OPERATION
Table 15-13: Directional quadrilateral phase distance functions
Characteristic
Reactance
Directional
Right blinder
Left blinder
Table 15-14: Directional quadrilateral ground distance functions
Characteristic
Reactance
Directional
Right blinder
Left blinder
Fault type
Zero-sequence
Table 15-15: Non-directional mho phase distance functions
Characteristic
Offset mho
Table 15-16: Non-directional mho ground distance functions
Characteristic
Offset mho
Fault type
Table 15-17: Non-directional quadrilateral phase distance functions
Characteristic
Forward reactance
Reverse reactance
Right blinder
Left blinder
Table 15-18: Non-directional quadrilateral ground distance functions
Characteristic
Forward reactance
Reverse reactance
Right blinder
Left blinder
Fault type
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Comparator inputs
Input 1
Input 2
I × Z – V
I × Z
I × Z
V_1M
D
I × Z
– V
I × Z
R
I × Z
– V
I × Z
L
Comparator inputs
Input 1
Input 2
I × Z – V
j × I_0 × e
I_0 × Z
V_1M
D
I_2 × Z
V_1M
D
I × Z
– V
I × Z
R
I × Z
– V
I × Z
L
I_0
I_2
I_0 × Z
–V_0
D
Comparator inputs
Input 1
Input 2
I × Z – V
I × Z
Comparator inputs
Input 1
Input 2
I × Z – V
I × Z
I_0
I_2
Comparator inputs
Input 1
Input 2
I × Z – V
I × Z
I × Z
– V
I × Z
REV
I × Z
– V
I × Z
R
I × Z
– V
I × Z
L
Comparator inputs
Input 1
Input 2
I × Z – V
j × I_0 × e
I_0 × Z
–j × I_0 × e
D
I × Z
– V
I × Z
R
I × Z
– V
I × Z
L
I_0
I_2
Limit angle
Comparator limit
Directional comparator limit
90°
R
90°
L
Limit angle
jΘ
jΘ
or j × I_2 × e
Comparator limit
Directional comparator limit
Directional comparator limit
90°
R
90°
L
50° (removed during open pole conditions)
90° (zones 2 and 3 only; removed during open
pole conditions)
Limit angle
– V
Comparator limit
REV
Limit angle
– V
Comparator limit
REV
50° (removed during open pole conditions)
Limit angle
Comparator limit
Comparator limit
REV
90°
R
90°
L
Limit angle
jΘ
jΘ
or j × I_2 × e
Comparator limit
jΘ
jΘ
or –j × I_2 × e
Comparator limit
90°
R
90°
L
50° (removed during open pole conditions)
Plus
THE D90
DISTANCE ELEMENTS
547
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