GE D30 Instruction Manual page 475

CHAPTER 9: THEORY OF OPERATION
If the
FAULT REPORT 1 VT SUBSTITUTION
location is performed based on the actual phase to ground voltages. If the VTs are connected in a delta configuration, fault
location is performed based on the delta voltages and zero-sequence voltage approximated based on the zero-sequence
current:
where Z is the equivalent zero-sequence impedance behind the relay as entered under the fault report setting menu.
SYS0
SETTING
FAULT REPORT
TRIG:
Off=0
SETTINGS
FAULT REPORT
SOURCE:
X
SRC 50DD OP
I
A
I
B
I
C
3I_0
VA or VAB
VB or VBC
VC or VCA
Vn or V_0
SHOT # FROM
AUTO RECLOSURE
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
setting value is "I0" and the VTs are connected in a wye configuration, the fault
1
V = -- V ( V ) Z
– –
A AB CA
3
1
V = -- V ( V ) Z
– –
B BC AB
3
1
V = -- V ( V ) Z
– –
B CA BC
3
Figure 9-10: Fault locator scheme
AND
0
3 SEC
I
SYS0 0
I
SYS0 0
I
SYS0 0
SETTINGS
FAULT REPORT 1 Z1
MAG:
FAULT REPORT 1 Z1
ANGLE:
FAULT REPORT 1 Z0
MAG:
FAULT REPORT 1 Z0
ANGLE:
FAULT REPORT 1
LENGTH UNITS:
FAULT REPORT 1
LENGTH:
FAULT REPORT 1 VT
SUBSTITUTION:
FAULT REP 1
SYSTEM Z0 MAG:
FAULT REP 1
SYSTEM Z0 ANGLE:
RUN
ACTUAL VALUES
FAULT REPORT #
DATE
TIME
FAULT TYPE
FAULT
FAULT LOCATION
LOCATOR 1
FAULT# RECLOSE SHOT
FAULT LOCATOR
Eq. 9-20
827094A5.CDR
9-23
9