CHAPTER 3: INSTALLATION WIRING
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 3-15
3
The exact placement of a zero-sequence core balance CT to detect ground fault current is shown as follows. Twisted-pair
cabling on the zero-sequence CT is recommended.
Figure 3-14: Zero-sequence core balance CT installation
The phase voltage channels are used for most metering and protection purposes. The auxiliary voltage channel is used as
input for the synchrocheck and volts-per-hertz features, which are optional features available for some UR models.
Figure 3-15: CT/VT module wiring
Substitute the tilde “~” symbol with the slot position of the module in the following figure.
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