CET PMC-690, User Manual

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CET Electric Technology
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Figure 4-9 Inrush Current
The PMC-690 provides the capability for detecting and the capturing of the inrush current transient
disturbance that is in accordance with the IEC 61000-4-30 Standard for Class A performance.
The PMC-690 provides following programmable parameters for Inrush Current Setpoint which can be
set via the Front Panel or through communication.
Setup Parameters Definition Options/Default*
Inrush Current Enable Specifies if inrush current setpoint is enabled. 0*=Disabled, 1=Enabled
Inrush Current Threshold Defines the range that current must exceed for the Inrush
Current becomes active. 100% to 500%
(Default=120%
I
Normal
)
Inrush Current Hysteresis Defines the limit, which is equal to Inrush Threshold - Inrush
Hysteresis, for the
I
half cycle rms
current below which the inrush
transient end.
1-1000(x0.1% I
Normal
)
(Default = 10)
Inrush Current Trigger Specify what action a setpoint can take when Inrush Current
become active
WFR* / DWR / RMS Recorder
Table 4-17 Setup Parameters for Inrush Current Setpoint
4.3.13 Flagging Concept
As per Section 4.7 of IEC 61000-4-30:
During a dip, swell, or interruption, the measurement algorithm for other parameters (for example, frequency measurement)
might produce an unreliable value. The flagging concept therefore avoids counting a single event more than once in different
parameters (for example, counting a single dip as both a dip and a frequency variation) and indicates that an aggregated value
might be unreliable.
Flagging is only triggered by dips, swells and interruptions. The detection of dips and swells is dependent on the threshold selected
by the user, and this selection will influence which data are "flagged".
The flagging concept is applicable for Class A measurement performance during measurement of power frequency, voltage
magnitude, flicker, supply voltage unbalance, voltage harmonics, voltage interharmonics, mains signalling and measurement of
underdeviation and overdeviation parameters.
If during a given time interval any value is flagged, the aggregate value indicating that value shall also be flagged. The flagged
value shall be stored and also included in the aggregation process, for example, if during a given time interval any value is flagged
the aggregated value that includes this value shall also be flagged and stored.
The PMC-690 is a certified IEC 61000-4-30 Class A device so it supports the Flagging Concept .
Flagging Setup The Flagging Setup register (40825) defines if Flagging is enabled for a particular type
of Statistical Log as illustrated in the following table, with a bit value of 1 meaning that
Flagging is enabled for the corresponding Log type.
Bit 15~Bit 4 Bit 3 Bit 2 Bit1 Bit 0
Reserved EN50160 Min. Log Max. Log SDR Log
Table 4-18 Flagging Setup Register (40825)