PPA5xx/15xx user manual
7-1
7 Measurement options
7.1 Wiring configuration
Unlike the single phase PPA1510, the three phase version
PPA1530 can be used in a variety of wiring configurations.
3 phase 2 wattmeter + phase 3
In the single phase modes (phase 1, phase 2, phase 3) the
other phase inputs are completely ignored and the
selected phase acts as a completely independent single
phase power analyser.
In the 3 phase 2 wattmeter configuration, the voltages are
measured relative to phase 3. The phase 1 voltage input is
connected across phase 1 and phase 3, and phase 2
voltage input is connected across phase 2 and phase 3,
thus measuring phase to phase voltage directly. Phase 1
and 2 current inputs are connected normally. There is no
need to measure the current in phase 3, as phase 3 has no
voltage relative to itself so the power contribution is zero.
In this mode, the neutral channel displays the synthesised
phase 3 current.
The advantage of this connection method is that 3 phase
power can be measured with only 2 wattmeters. This frees
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