Alstom iSTAT M355, Manual

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User Manual M3x5/EN M/B
iSTAT M3x5
Page 69

Minimum (MD) and Maximum (MD) value represents the calculation of a MD value
with applied thermal function. This only applies to recorders A and B

Average value represents the calculated average value within the selected storage
interval

Actual value represents the first momentary value within the selected storage interval.
Note that momentary values are not a single period value but an average (0.1 s to 5
s). This only applies to recorders C and D.

Minimum and Maximum (Period) values represent the minimum or maximum values
within the selected storage interval calculated in a single period. This function allows
recording of very fast changes. It only applies to recorders C and D.
10.16 Power Quality Recorder Report
The M3x5 has a power quality measurement function that monitors compliance to the
European standard EN50160. The power quality features can be set on the M3x5 and this
then determines when data reports are ready to be communicated. QDSP2 is then used to
extract and display the reports.
10.16.1 Conformity of Voltage with EN 50160 Standard
The EN 50160 standard deals with the voltage characteristics of electricity supplied by public
distribution systems. It specifies the limits of values of voltage characteristics in normal
operation within public low or medium voltage distribution networks. Following this definition
the
M3x5 Power Quality Analyzer is designed for monitoring voltage characteristics of a
distribution system according to the EN 50160 standard. Together with setting and
monitoring software
QDSP2 voltage characteristics can be monitored and weekly reports
about power quality can be issued.
Based on the requirements stated in the standard, default parameters are set in the M3x5
according to which supervision of all the required characteristics is performed.
Individual parameter settings can also be changed to suit customer requirements.
CAUTION
Factory default settings for Power Quality characteristics are in compliance with standard EN
50160. By changing individual parameters conformity of weekly reports with this standard is
no longer valid.