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www.elspec-ltd.com | December 2014 | SMX-0609-0101
User Manual | EQ-ST | V15
Figure 67: Network Nominal Voltage
S
AMPLING
C
ONFIGURATION
It is possible to shift all input channels by different values. Typically, phase shifts are created by transformers,
such as Delta/WYE. It is strongly recommended to use a WYE/WYE step up transformer with zero degree shift
Wye are possible but measurements accuracy is reduced.
WARNING
Changing the phase shifts affects all system performance
and must only be done after an express instruction from
Elspec.
Each channel has its own shift parameter, but all three phases of same channel share the same shift value:
voltages, mains current and capacitors current. There is no need to shift all three channels simultaneously so at
least one of the values shall be set to 0. The value is in degrees and positive value represents delay in the
phase. For example, for Delta/WYE transformer with mains current connected at the primary but voltages and
capacitor currents connected at the secondary, set mains current shift to
30.94 (the values are in steps of 2.8°
and -30.94 is the closest value to -30.0) and voltage and capacitor current phase shift to 0. If also the voltages
are connected at the primary, set the voltages and mains current phase shift to 0 and capacitor current phase
shift to 30.94.
69 through Figure 71 are skipped.
Figure 68: Sampling Configuration
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