GE T60, Instruction Manual

Page: 5 / 796

ADDENDUM
a) SLG FAULT
An AG fault occurs close to the considered relay. Immediately after the fault, the disturbance detector (50DD) picks-up and
activates the phase selector. The phase selector recognizes an AG fault by asserting its PHASE SELECT AG operand.
Ground distance zone 1 (AG element) responds to the fault.
At this moment, the request to trip is placed for the trip output. As the fault is recognized as an AG fault, the TRIP PHASE A
operand is asserted by the trip output. This signal is passed to the breaker control scheme and results in tripping pole A of
the breaker.
Table 0–1: DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC COMPARATOR INPUTS LIMIT ANGLE
Variable mho I × Z – V V_1M COMP LIMIT
Reactance I
×
Z – V I
×
Z COMP LIMIT
Directional I × Z
D
V_1M DIR COMP LIMIT
Fault type NOT SLG Removed during open pole conditions
Table 0–2: DIRECTIONAL QUADRILATERAL PHASE DISTANCE FUNCTIONS
CHARACTERISTIC COMPARATOR INPUTS LIMIT ANGLE
Reactance I
×
Z – V I
×
Z COMP LIMIT
Directional I × Z
D
V_1M DIR COMP LIMIT
Right Blinder I
×
Z
R
– V I
×
Z
R
90°
Left Blinder I × Z
L
– V I × Z
L
90°
Fault type NOT SLG Removed during open pole conditions
Table 0–3: NON-DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC COMPARATOR INPUTS LIMIT ANGLE
Offset mho I
×
Z – V V-I
×
Z
REV
COMP LIMIT
Fault type NOT SLG Removed during open pole conditions
Table 0–4: NON-DIRECTIONAL QUADRILATERAL PHASE DISTANCE FUNCTIONS
CHARACTERISTIC COMPARATOR INPUTS LIMIT ANGLE
Forward Reactance I × Z – V I × Z COMP LIMIT
Reverse Reactance I
×
Z
REV
– V I
×
Z
REV
COMP LIMIT
Right Blinder I × Z
R
– V I × Z
R
90°
Left Blinder I
×
Z
L
– V I
×
Z
L
90°
Fault type NOT SLG Removed during open pole conditions