GE D30 Instruction Manual page 325

8 THEORY OF OPERATION
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.
l) OVERCURRENT SUPERVISION
The overcurrent supervision responds to the following currents:
AB phase element: (I
A
BC phase element: (I
B
CA phase element: (I
C
A, B, C ground element: 3 × I_0
The following tables summarize the characteristics of the distance elements
Table 8–1: DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Variable mho
Reactance
Directional
Table 8–2: DIRECTIONAL MHO GROUND DISTANCE FUNCTIONS
CHARACTERISTIC
Variable mho
Reactance
Directional
Directional
Fault-type
Zero-sequence
Table 8–3: DIRECTIONAL QUADRILATERAL PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Reactance
Directional
Right Blinder
Left Blinder
Table 8–4: DIRECTIONAL QUADRILATERAL GROUND DISTANCE FUNCTIONS
CHARACTERISTIC
Reactance
Directional
Directional
Right Blinder
Left Blinder
Fault-type
Zero-sequence
Table 8–5: NON-DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Offset mho
GE Multilin
– I ) / 3
B
– I ) / 3
C
– I ) / 3
A
COMPARATOR INPUTS
I × Z – V V_1M
I × Z – V I × Z
I × Z
V_1M
D
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 – V I × Z
R R
I × Z – V I × Z
L L
COMPARATOR INPUTS
jΘ
I × Z – V j × I_0 × e or j × I_2 × 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
I × Z – V I × Z – V
REV
D30 Line Distance Relay
LIMIT ANGLE
COMP LIMIT
COMP LIMIT
DIR COMP LIMIT
LIMIT ANGLE
COMP LIMIT
COMP LIMIT
DIR COMP LIMIT
DIR COMP LIMIT
50°
90°
LIMIT ANGLE
COMP LIMIT
DIR COMP LIMIT
90°
90°
LIMIT ANGLE
jΘ
COMP LIMIT
DIR COMP LIMIT
DIR COMP LIMIT
R
L
LIMIT ANGLE
COMP LIMIT
8.1 DISTANCE ELEMENTS
90°
90°
50°
90°
8-5
8