GE D90 Plus - Page 645

CHAPTER 15: THEORY OF OPERATION DISTANCE ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 635
Table 15-13: Directional quadrilateral phase distance functions
Table 15-14: Directional quadrilateral ground distance functions
Table 15-15: Non-directional mho phase distance functions
Table 15-16: Non-directional mho ground distance functions
Table 15-17: Non-directional quadrilateral phase distance functions
Zero-sequence I_0 × Z
D
–V_0 90° (zones 2 and 3 only; removed during open
pole conditions)
Characteristic Comparator inputs Limit angle
Input 1 Input 2
Reactance I × Z – VI × Z Comparator limit
Directional I × Z
D
V_1M Directional comparator limit
Right blinder I × Z
R
– VI × Z
R
90°
Left blinder I × Z
L
– VI × Z
L
90°
Characteristic Comparator inputs Limit angle
Input 1 Input 2
Reactance I × Z – Vj × I_0 × e
jΘ
or j × I_2 × e
jΘ
Comparator limit
Directional I_0 × Z
D
V_1M Directional comparator limit
I_2 × Z
D
V_1M Directional comparator limit (removed when
3I_0 > overcurrent supervision and I_2 < cutoff)
Right blinder I × Z
R
– VI × Z
R
90°
Left blinder I × Z
L
– VI × Z
L
90°
Fault type I_0 I_2 50° (removed during open pole conditions or
when 3I_0 > overcurrent supervision and
I_2<cutoff)
Zero-sequence I_0 × Z
D
–V_0 90° (zones 2 and 3 only; removed during open
pole conditions)
Characteristic Comparator inputs Limit angle
Input 1 Input 2
Offset mho I × Z – VI × Z
REV
– V Comparator limit
Characteristic Comparator inputs Limit angle
Input 1 Input 2
Offset mho I × Z – VI × Z
REV
– V Comparator limit
Fault type I_0 I_2 50° (removed during open pole conditions or
when 3I_0 > overcurrent supervision and
I_2<cutoff)
Characteristic Comparator inputs Limit angle
Input 1 Input 2
Forward reactance I × Z – VI × Z Comparator limit
Reverse reactance I × Z
REV
– VI × Z
REV
Comparator limit
Right blinder I × Z
R
– VI × Z
R
90°
Left blinder I × Z
L
– VI × Z
L
90°
Characteristic Comparator inputs Limit angle
Input 1 Input 2