GE D60 Instruction Manual

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GE Multilin D60 Line Distance Relay 5-415 SETTINGS 5.3 SYSTEM SETUP5The phase sequence of the power system is required to properly calculate sequence components and power parameters.The PHASE ROTATION setting matches the power system phase sequence. Note that this setting informs the relay of theactual system phase sequence, either ABC or ACB. CT and VT inputs on the relay, labeled as A, B, and C, must be con-nected to system phases A, B, and C for correct operation.The FREQUENCY AND PHASE REFERENCE setting determines which signal source is used (and hence which AC signal) forphase angle reference. The AC signal used is prioritized based on the AC inputs that are configured for the signal source:phase voltages takes precedence, followed by auxiliary voltage, then phase currents, and finally ground current.For three phase selection, phase A is used for angle referencing ( ), while Clarke transformation of thephase signals is used for frequency metering and tracking ( ) for better performance dur-ing fault, open pole, and VT and CT fail conditions.The phase reference and frequency tracking AC signals are selected based upon the Source configuration, regardless ofwhether or not a particular signal is actually applied to the relay.Phase angle of the reference signal will always display zero degrees and all other phase angles will be relative to this sig-nal. If the pre-selected reference signal is not measurable at a given time, the phase angles are not referenced.The phase angle referencing is done via a phase locked loop, which can synchronize independent UR-series relays if theyhave the same AC signal reference. These results in very precise correlation of time tagging in the event recorder betweendifferent UR-series relays provided the relays have an IRIG-B connection.FREQUENCY TRACKING should only be set to "Disabled" in very unusual circumstances; consult the factory for spe-cial variable-frequency applications.5.3.3 SIGNAL SOURCESPATH: SETTINGS !" SYSTEM SETUP !" SIGNAL SOURCES ! SOURCE 1(4)Four identical source menus are available. The "SRC 1" text can be replaced by with a user-defined name appropriate forthe associated source.ìFî and ìMî represent the module slot position. The number directly following these letters represents either the first bank offour channels (1, 2, 3, 4) called ì1î or the second bank of four channels (5, 6, 7, 8) called ì5î in a particular CT/VT module.Refer to the Introduction to AC Sources section at the beginning of this chapter for additional details on this concept.It is possible to select the sum of up to five (5) CTs. The first channel displayed is the CT to which all others will be referred.For example, the selection ìF1+F5î indicates the sum of each phase from channels ìF1î and ìF5î, scaled to whichever CThas the higher ratio. Selecting ìNoneî hides the associated actual values.The approach used to configure the AC sources consists of several steps; first step is to specify the information about eachCT and VT input. For CT inputs, this is the nominal primary and secondary current. For VTs, this is the connection type,ratio and nominal secondary voltage. Once the inputs have been specified, the configuration for each Source is entered,including specifying which CTs will be summed together.# SOURCE 1#SOURCE 1 NAME:SRC 1Range: up to 6 alphanumeric charactersMESSAGE SOURCE 1 PHASE CT:NoneRange: None, F1, F5, F1+F5,... up to a combination ofany 5 CTs. Only Phase CT inputs are displayed.MESSAGE SOURCE 1 GROUND CT:NoneRange: None, F1, F5, F1+F5,... up to a combination ofany 5 CTs. Only Ground CT inputs are displayed.MESSAGE SOURCE 1 PHASE VT:NoneRange: None, F1, F5, M1, M5Only phase voltage inputs will be displayed.MESSAGE SOURCE 1 AUX VT:NoneRange: None, F1, F5, M1, M5Only auxiliary voltage inputs will be displayed.VANGLE REF V A=VFREQUENCY 2V A V B– V C–( ) 3⁄=NOTE