GE Multilin
F60 Feeder Protection System
6-23
6 ACTUAL VALUES
6.3 METERING
6
N
= 64 is the number of samples per cycle
ω
0
= 2
π
f
is the angular frequency based on the system frequency (50 or 60 Hz)
k
= 1, 2,...,
N
– 1 is the index over one cycle for the Fast Fourier Transform (FFT)
m
is the last sample number for the sliding window
h
= 1, 2,..., 25 is the harmonic number
The short-time Fourier transform is applied to the unfiltered signal:
(EQ 6.3)
The harmonics are a percentage of the fundamental signal obtained as a ratio of harmonic amplitude to fundamental ampli-
tude multiplied by 100%. The total harmonic distortion (THD) is the ratio of the total harmonic content to the fundamental:
(EQ 6.4)
Voltage harmonics are not available on F60 relays configured with the high-impedance fault detection (Hi-Z) fea-
ture.
Voltage harmonics are calculated only for Wye connected phase VTs. Ensure the
SYSTEM SETUP
AC INPUTS
VOLTAGE BANK F5
PHASE VT XX CONNECTION
setting is “Wye” to enable voltage harmonics metering.
6.3.3 SENSITIVE DIRECTIONAL POWER
PATH: ACTUAL VALUES
METERING
SENSITIVE DIRECTIONAL POWER
The effective operating quantities of the sensitive directional power elements are displayed here. The display may be useful
to calibrate the feature by compensating the angular errors of the CTs and VTs with the use of the
RCA
and
CALIBRATION
settings.
6.3.4 SYNCHROCHECK
PATH: ACTUAL VALUES
METERING
SYNCHROCHECK
SYNCHROCHECK 1(4)
If a synchrocheck function setting is "Disabled", the corresponding actual values menu item is not displayed.
SENSITIVE
DIRECTIONAL POWER
DIRECTIONAL POWER 1
3
Φ
: 0.000 W
MESSAGE
DIRECTIONAL POWER 2
3
Φ
: 0.000 W
SYNCHROCHECK 1
SYNCHROCHECK 1 DELTA
VOLT: 0.000
V
MESSAGE
SYNCHROCHECK 1 DELTA
PHASE: 0.0°
MESSAGE
SYNCHROCHECK 1 DELTA
FREQ: 0.00
Hz
F
real
m h
,
(
)
2
N
----
f m k
–
(
)
h
ω
0
t k
( )
⋅
⋅
(
)
cos
⋅
(
)
k
=
F
imag
m h
,
(
)
2
N
----
f m k
–
(
)
h
ω
0
t k
( )
⋅
⋅
(
)
sin
⋅
(
)
k
=
F
ampl
m h
,
(
)
F
real
m h
,
(
)
2
F
imag
m h
,
(
)
2
+
=
THD
F
2
2
F
3
2
…
F
25
2
+
+
+
=
NOTE
NOTE
Summary of Contents for F60
Page 10: ...x F60 Feeder Protection System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 F60 Feeder Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 138: ...4 28 F60 Feeder Protection System GE Multilin 4 2 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 454: ...5 316 F60 Feeder Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 500: ...7 14 F60 Feeder Protection System GE Multilin 7 1 COMMANDS 7 COMMANDS AND TARGETS 7 ...
Page 508: ...8 8 F60 Feeder Protection System GE Multilin 8 2 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Page 522: ...10 12 F60 Feeder Protection System GE Multilin 10 6 DISPOSAL 10 MAINTENANCE 10 ...
Page 660: ...B 116 F60 Feeder Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 706: ...E 10 F60 Feeder Protection System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 718: ...F 12 F60 Feeder Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Page 728: ...H 8 F60 Feeder Protection System GE Multilin H 2 ABBREVIATIONS APPENDIX H H Z Impedance Zone ...
Page 730: ...H 10 F60 Feeder Protection System GE Multilin H 3 WARRANTY APPENDIX H H ...