Multi-Function Control ETMFC610 http://www.entecene.co.kr
7.1.3.6. Power Quality Monitoring
Place the curser on “PQM” in MONITORING menu, press [ENT] button to move into this menu.
Power Quality Monitoring elements are set in this menu and sub-menu is as below.
The ETMFC610 provides voltage and current measurement signals at a rate of 64 samples / cycle p
er cycle, providing instantaneous voltage drop (Sag), instantaneous voltage swell, interrupt, under v
oltage, overvoltage, And power quality monitoring functions such as voltage / current imbalance.
The power quality for power grid is classified into several categories according to the voltage
magnitude and duration according to the international standard IEEE 1159 "Recommended Practice
on Monitoring Electric Power Quality". The power quality categories are listed in “Figure 7-3.
Power Quality Category according to IEEE 1159 (Interrupt, Sag, Swell)” and “Table 7-3. Power
Quality Category according to IEEE 1159 (Interrupt, Sag, Swell)”.
When the power quality monitoring element occurs, record the PQM event, PQM waveform and
PQM counter. In addition, when the related communication point is used, the occurrence event can
be transmitted to the master station through the remote communication.
Transient Short duration Long duration
1min0.5cycle
30cycle 3sec
Swell
Over voltage
Instant
Moment
Temporary
Sag Under voltage
1.0 pu
1.1 pu
0.9 pu
0.1 pu
Interruption
Normal Range
Figure 7-3. Power Quality categories according to IEEE 1159 (Interrupt, Sag, Swell)
>1.PQM FUNCTION
2.INTERRUPT
3.SAG
4.SWELL
5.HARMONICS
6.CURR UNBALANCE
7.VOLT UNBALANCE
8.UNDER VOLTAGE
9.OVER VOLTAGE
10.UNDER FREQUENCY
11.OVER FREQUENCY
12.ITHD/UBI I LIMIT
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