© 2008 Siemens Energy & Automation, Inc. All Rights Reserved
ACCESS 9340 and 9360 Meters PMCM-9340D-0208
Appendix C—EN50160 Evaluation 2/2008
EN–222
Possible Configurations Through Register Writes
This section describes the changes you can make to configurations
for the EN50160 evaluation through register writes in the ACCESS
9360. Refer to “EN50160 Evaluation System Configuration and
Status Registers” on page 229 for register assignments.
• Select the first day of the week for evaluations. You can define
the first day of the week to be used for the EN50160 evaluations
in register 3905.
• Define the voltage interruption. The standard defines an
interruption as voltage less than 1% of nominal voltage. Because
some locations require a different definition, you can configure
this value in register 3906.
• Define allowable range of slow voltage variations. The
standard defines the allowable range of slow voltage variations to
be ±10% of nominal voltage. Because some locations require a
different definition, you can configure this value in register 3907.
Evaluation During Normal Operation
1
When the EN50160 evaluation is enabled, the ACCESS 9360
evaluates metered data under normal operating conditions,
“excluding situations arising from faults or voltage interruptions.” For
this evaluation, normal operating conditions are defined as all phase
voltages greater than the definition of interruption. The standard
specifies acceptable ranges of operation for these data items.
This section describes how the EN50160 standard addresses
metered data.
Power Frequency
EN50160 states that the nominal frequency of the supply voltage
shall be 50 Hz. Under normal operating conditions the mean value of
the fundamental frequency measured over ten seconds shall be
within the following range:
• for systems with synchronous connection to an interconnected
system:
— 50 Hz ± 1% during 99.5% of a year
— 50 Hz + 4 to -6% for 100% of the time
1
BS EN 50160:2000, Voltage characteristics of electricity supplied by public distribution systems, BSi.
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