Installation 25
7) Four Wire Wye Connection Using 2 PTs, 3 CTs (2½-element)
This configuration can be used with either 660V or 120V input. The instrument
senses the 2 line-to-neutral voltages and 3 line currents as shown in Figure 2-11. The
common taps of the PT secondaries are connected to terminal 11. This configuration
will provide accurate power measurements only if the voltages are balanced.
Figure 2-11 4-wire Wye Connection Using 2 PTs, 3 CTs (2½-element) WIRING MODE 3Ln3/3LL3
2.9 Auxiliary Current Input Connections
The PM295 can be equipped with an auxiliary current input (optional). Figure 2-12
shows examples of the auxiliary current input connections. This input can be used
for direct measurement of either ground leakage or the neutral current.
The secondary rating of the CT connected to the auxiliary current input is either 1
A, 5 A, or 5 mA, as per your order. The CT PRIMARY CURRENT parameter for
the auxiliary current input is set in the instrument independently of the phase current
inputs.
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