Mmxu; Mmxn; Mhai; Mhan - Camille Bauer SINEAX CAM IEC 61850 Instructions D'installation

3.1 MMXU

This node provides valid measurement data if an unbalanced three-phase system with three or four wires or a
split-phase system (two phase system) is monitored. Some of the measurements are valid for unbalanced 4-wire
systems only (see appendix).

3.2 MMXN

This node provides valid measurement data if single phase or balanced three-phase systems are monitored. For
balanced three-wire systems the given system voltage is Vol=(U12+U23+U31)/3. The phase-to-phase voltages
U12, U23 and U31 are available via the node MMXU.

3.3 MHAI

This node contains the data of the harmonic analysis if measurement is performed in an unbalanced multi-phase
system.

3.4 MHAN

This node contains the data of the harmonic analysis if measurement is performed in a single-phase or a
balanced multi-phase system.

3.5 MMTR1, MMTR2

The first instance MMTR1 contains the high tariff meters, the second one MMTR2 the low tariff meters. If no tariff
switching is active all data of MMTR2 are invalid.
Note: Meters are implemented as BCR (Binary Counter Reading). The real meter content has to be
calculated by multiplying the present value with the pulse quantity. The pulse quantity is always a
power of 10 and therefore defines the position of the decimal point. The pulse quantity does change
only if the configuration of the nominal input values is changed, normally it's constant.
Meter_content = actVal • pulsQty

3.6 MSTA

The measurement data of the node MSTA is produced at the end of each averaging interval. Here it makes sense
to work with dead-bands of 0.0% for all measurements, to assure that in every case the most present values will
be reported. This is implemented in the ICD file „CAM.V2.10.110222.icd", which is also stored on the 'Doku-CD'
and can be loaded as an alternative to the ICD file installed in the work, having dead-bands of 0.5%. The
modification of the dead-band is described in the document "CAM61850.PAR-E.V1.0.110215.PDF".
Note: Normally the quantities for
the mean-values of the CAM are
configurable. Using the IEC61850
interface this configuration will be
fixed to allow the measurement of
the required quantities. Only the
interval time, which is typically 10
or 15 min., may be adjusted.
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