3-8 N60 Network Stability and Synchrophasor Measurement System GE Multilin3.2 WIRING 3 HARDWARE3Figure 3–9: CONTROL POWER CONNECTION3.2.4 CT AND VT MODULESA CT/VT module can have voltage or current inputs on channels 1 through 4 inclusive, or channels 5 through 8 inclusive.Channels 1 and 5 are intended for connection to phase A, and are labeled as such in the relay. Likewise, channels 2 and 6are intended for connection to phase B, and channels 3 and 7 are intended for connection to phase C.Channels 4 and 8 are intended for connection to a single-phase source. For voltage inputs, these channel are labelled asauxiliary voltage (VX). For current inputs, these channels are intended for connection to a CT between system neutral andground, and are labelled as ground current (IG).Verify that the connection made to the relay terminals for nominal current of 1 A or 5 A matches thesecondary rating of the connected CTs. Unmatched CTs can result in equipment damage or inade-quate protection.To connect the module, size 12 American Wire Gauge (AWG) is commonly used; the maximum size is 10 AWG.CT/VT modules may be ordered with a standard ground current input that is the same as the phase current input. Each ACcurrent input has an isolating transformer and an automatic shorting mechanism that shorts the input when the module iswithdrawn from the chassis. There are no internal ground connections on the current inputs. Current transformers with 1 to50000 A primaries and 1 A or 5 A secondaries can be used.The above modules have enhanced diagnostics, when ordered as such, that can automatically detect CT/VT hardware fail-ure and take the relay out of service.CT connections for both ABC and ACB phase rotations are identical as shown in the Typical wiring diagram.The exact placement of a zero-sequence core balance CT to detect ground fault current is shown as follows. Twisted-paircabling on the zero-sequence CT is recommended.AC or DC NOTE:14 gauge strandedwire with suitabledisconnect devicesis recommended.Heavy copper conductoror braided wireSwitchgearground bus UR-seriesprotection systemFILTER SURGE– +LOW+HIGHB8b B8a B6a B6b B5bCONTROLPOWER827759AA.CDR—+OPTIONALETHERNET SWITCHAC or DCGNDNOTICE
