Synchrocheck - GE G60 Instruction Manual

METERING
N = 64 is the number of samples per cycle
ω = 2πf is the angular frequency based on the system frequency (50 or 60 Hz)
0
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:
The harmonics are a percentage of the fundamental signal obtained as a ratio of harmonic amplitude to fundamental
amplitude multiplied by 100%. The total harmonic distortion (THD) is the ratio of the total harmonic content to the
fundamental:
Voltage harmonics are calculated only for Wye connected phase VTs. Ensure that the
 VOLTAGE BANK F5  PHASE VT XX CONNECTION

6.4.4 Synchrocheck

ACTUAL VALUES  METERING  SYNCHROCHECK  SYNCHROCHECK 1(4)
 SYNCHROCHECK 1

6
6-22
setting is "Wye" to enable voltage harmonics metering.
SYNCHROCHECK 1 DELTA

VOLT: 0.000 kV
SYNCHROCHECK 1 DELTA

FREQ: 0.00 Hz
SYNCHROCHECK 1

DELTA PHASE: 0.0°
SYNCHROCHECK 1

SYNSCP D_PH: 0.0°
SYNCHROCHECK 1

V1 MAG: 0.000 kv
SYNCHROCHECK 1

V1 ANG: 0.0°
SYNCHROCHECK 1

V2 MAG: 0.000 kV
SYNCHROCHECK 1

V2 ANG: 0.0°
SYNCHROCHECK 1 PROJ

V2 MAG: 0.000 kV
SYNCHROCHECK 1 PROJ

V2 ANG: 0.0°
SYNCHROCHECK 1 PROJ

DELTA_PHASE: 0.0°
CHAPTER 6: ACTUAL VALUES
SYSTEM SETUP  AC INPUTS
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Eq. 6-3
Eq. 6-4