2.3 Device Overview
2.3.1 Key Features
The Vecto III records both voltages and currents of a single 3-phase feeder with IEC
61000-4-30 Class A performance.
• Voltage inputs:
• Class A performance over all of the input range inclusive of 63.5 V (if L-N
measurements are done in a 110 V line-line VT circuit)
• 6 terminals are used for 4 voltage input channels with maximum input
ratings of 600 V.
o The first 4 terminals connect 3 different phase voltages such as in a
3-phase system.
o Input channel 1-3 is referenced to a neutral (4
th
terminal)
connection. This 4
th
terminal acts as a reference channel and can be
any phase voltage if a 3-phase line-line voltage circuit is measured.
o If it is a 3-phase line-neutral voltage circuit, then the 4
th
terminal
will be connected to the neutral voltage.
o The 5
th
and 6
th
terminal is the 4
th
channel and a fully differential (2
terminal) input channel.
• Current inputs:
• 4 X 1/5 A CT inputs
• 4 X 1 V
rms
differential voltage transducer inputs with a 5 V power supply
(to be used to power Rogowski coils).
• Digitisation of input signals
• 500 kHz sampling of primary input signals.
• 50 kHz is digitally retained and subjected to the IEC 61000-4-30 Class A
signal processing requirements.
• Power supply
• PoE and/or a 90-300 V AC/DC power factor corrected power supply.
• 1/2 hour power failure ride-through via an internal LiFePO
4
battery.
• Data storage
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