GE T60 Instruction Manual page 5

Table 0–1: DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Variable mho
Reactance
Directional
Fault type
Table 0–2: DIRECTIONAL QUADRILATERAL PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Reactance
Directional
Right Blinder
Left Blinder
Fault type
Table 0–3: NON-DIRECTIONAL MHO PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Offset mho
Fault type
Table 0–4: NON-DIRECTIONAL QUADRILATERAL PHASE DISTANCE FUNCTIONS
CHARACTERISTIC
Forward Reactance
Reverse Reactance
Right Blinder
Left Blinder
Fault type
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.
ADDENDUM
COMPARATOR INPUTS
I × Z – V V_1M
I × Z – V I × Z
I × Z
V_1M
D
NOT SLG
COMPARATOR INPUTS
I × Z – V I × Z
I × Z V_1M
D
I × Z I × Z
– V
R
I × Z I × Z
– V
L
NOT SLG
COMPARATOR INPUTS
I × Z – V V-I × Z
NOT SLG
COMPARATOR INPUTS
I × Z – V I × Z
I × Z I × Z
– V
REV REV
I × Z I × Z
– V
R R
I × Z I × Z
– V
L L
NOT SLG
DIR COMP LIMIT
Removed during open pole conditions
R
L
Removed during open pole conditions
REV
Removed during open pole conditions
Removed during open pole conditions
LIMIT ANGLE
COMP LIMIT
COMP LIMIT
LIMIT ANGLE
COMP LIMIT
DIR COMP LIMIT
90°
90°
LIMIT ANGLE
COMP LIMIT
LIMIT ANGLE
COMP LIMIT
COMP LIMIT
90°
90°