CET PMC-690, User Manual

Page: 46 / 103

CET Electric Technology
46
4.4.9 Trend and SDR Trend
The PMC-690 provides Trend plot for realtime 3-phase V & I parameters (see Figure 4-15), and SDR
Trend plot for Max./Min., Avg. and CP95 with up to 11 SDR parameters including frequency, voltage,
current, power and PF. It’s important to note that the source of SDR Trend data are coming from SDR
Log. The selection of the SDR Trend plot is supported on Front Panel for only one parameter at a time.
SDR Trend Parameters
Channels (ON/OFF) Freq., Ua, Ub, Uc, Ia, Ib, Ic, P Total, Q Total, S Total, PF Total
Cursor (ON/OFF) Displaying the recorded Max., Min., Avg. and CP95 value
Table 4-27 On-screen Selections for SDR Trend Plot
Figure 4-15 SDR Trend display via Front Panel
4.4.10 PQDIF and COMTRADE Storage
The PMC-690 is capable of storing standard data with PQDIF format, DWR data, RMS data and WFR data
with COMTRADE format in its 16GB removable SD card. All record can be stored for about half a year
and will not suffer any loss in the event of a power failure. The PMC-690 can store following standard
data with PQDIF format.
Parameter Description Sampling intervals
Freq. Freq. 150 cycles
Voltage RMS
Ua, Ub, Uc, U4 150 cycles
Uab, Ubc, Uca 150 cycles
Current RMS Ia, Ib, Ic, I4 150 cycles
Voltage Deviation Ua/Ub/Uc Deviation 150 cycles
Unbalance
U1/U2/U0 Unbalance 150 cycles
I1/I2/I0 Unbalance 150 cycles
Harmonic Voltage
Ua/Ub/Uc/U4_THD, Ua/Ub/Uc/U4_TOHD, Ua/Ub/Uc/U4_TEHD,
150 cycles
Ua/Ub/Uc/U4_HD_01 ... Ua/Ub/Uc/U4_HD_63
Harmonic Current
Ia/Ib/Ic/I4_THD, Ia/Ib/Ic/I4_TOHD, Ia/Ib/Ic/I4_TEHD
150 cycles
Ia/Ib/Ic/I4_H01_RMS ... Ia/Ib/Ic/I4_H63_RMS
Flicker
Pst 10 mins
Plt 2 hours
Fundamental Power
kWa/kWb/kWc, kvara/kvarb/kvarc, kVAa/kVAb/kVAc, kW Total, kvar Total,
kVA Total
150 cycles
Total Power
kWa/kWb/kWc, kvara/kvarb/kvarc, kVAa/kVAb/kVAc, kW Total, kvar Total,
kVA Total
150 cycles
Total Harmonic Power
kWa/kWb/kWc TH, kvara/kvarb/kvarc TH
kVAa/kVAb/kVAc TH, kW/kvar/kVA TH
150 cycles
Power Factor PFa/PFb/PFc, PF Total -
Table 4-28 PQDIF Parameters
The PQDIF and COMTRADE file can be retrieved via reading SD card, under the pqdif/ and