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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
parameter for
CT PRIMARY CURRENT
the auxiliary current input is set in the instrument independently of the phase current
inputs.
Installation
25
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