3-8 C60 Breaker Management Relay GE Multilin3.2 WIRING 3 HARDWARE3Figure 3ñ9: CONTROL POWER CONNECTIONThe power supply module provides 48 V DC power for dry contact input connections and a critical failure relay (see TYPI-CAL WIRING DIAGRAM). The critical failure relay is a Form-C that will be energized once control power is applied and therelay has successfully booted up with no critical self-test failures. If any of the on-going self-test features detect a criticalfailure or control power is lost, the relay will de-energize.3.2.4 CT/VT MODULESA CT/VT module may have voltage inputs on channels 1 through 4 inclusive, or channels 5 through 8 inclusive. Channels 1and 5 are intended for connection to phase A, and are labeled as such in the relay. Channels 2 and 6 are intended for con-nection to phase B, and are labeled as such in the relay. Channels 3 and 7 are intended for connection to phase C and arelabeled as such in the relay. Channels 4 and 8 are intended for connection to a single phase source. If voltage, this channelis labelled the auxiliary voltage (VX). If current, this channel is intended for connection to a CT between a system neutraland ground, and is labelled the ground current (IG).a) AC CURRENT TRANSFORMER INPUTSVERIFY THAT THE CONNECTION MADE TO THE RELAY NOMINAL CURRENT OF 1 A OR 5 A MATCHESTHE SECONDARY RATING OF THE CONNECTED CTs. UNMATCHED CTs MAY RESULT IN EQUIPMENTDAMAGE OR INADEQUATE PROTECTION.The CT/VT module may be ordered with a standard ground current input that is the same as the phase current inputs (type8A) or with a sensitive ground input (type 8B) which is 10 times more sensitive (see the Technical Specifications section formore details). Each AC current input has an isolating transformer and an automatic shorting mechanism that shorts theinput when the module is withdrawn from the chassis. There are no internal ground connections on the current inputs. Cur-rent transformers with 1 to 50000 A primaries and 1 A or 5 A secondaries may be used.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 CT so that ground fault current will be detected is shown below. Twisted paircabling on the zero sequence CT is recommended.CAUTIONwww . ElectricalPartManuals . com
