GE Multilin L60 Line Phase Comparison System 5-675 SETTINGS 5.3 SYSTEM SETUP55.3.3 SIGNAL SOURCESPATH: SETTINGS ÖØ SYSTEM SETUP ÖØ SIGNAL SOURCES Ö SOURCE 1(2)Identical menus are available for each source. The "SRC 1" text can be replaced by with a user-defined name appropriatefor the associated source.The first letter in the source identifier represents the module slot position. The number directly following this letter repre-sents either the first bank of four channels (1, 2, 3, 4) called “1” or the second bank of four channels (5, 6, 7, 8) called “5” ina particular CT/VT module. Refer to the Introduction to AC sources section at the beginning of this chapter for additionaldetails on this concept.It is possible to select the sum of all CT combinations. The first channel displayed is the CT to which all others will bereferred. For example, the selection “F1+F5” indicates the sum of each phase from channels “F1” and “F5”, scaled towhichever CT has the higher ratio. Selecting “None” 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.When two CTs are connected and configured with these settings, it is imperative that the CT rated secondary cur-rent is identical for both CTs (that is, both CTs are 1 A rated or both CTs are 5 A rated).User selection of AC parameters for comparator elements:CT/VT modules automatically calculate all current and voltage parameters from the available inputs. Users must select thespecific input parameters to be measured by every element in the relevant settings menu. The internal design of the ele-ment specifies which type of parameter to use and provides a setting for source selection. In elements where the parametermay be either fundamental or RMS magnitude, such as phase time overcurrent, two settings are provided. One settingspecifies the source, the second setting selects between fundamental phasor and RMS. SOURCE 1SOURCE 1 NAME:SRC 1Range: up to six alphanumeric charactersMESSAGE SOURCE 1 PHASE CT:NoneRange: None, F1, F5, F1+F5,... up to a combination ofany 6 CTs. Only Phase CT inputs are displayed.MESSAGE SOURCE 1 GROUND CT:NoneRange: None, F1, F5, F1+F5,... up to a combination ofany 6 CTs. Only Ground CT inputs are displayed.MESSAGE SOURCE 1 PHASE VT:NoneRange: None, F1, F5Only phase voltage inputs will be displayed.MESSAGE SOURCE 1 AUX VT:NoneRange: None, F1, F5Only auxiliary voltage inputs will be displayed.Table 5–6: SOURCE CONFIGURATION FOR PHASE COMPARISONFUNCTION CT/VT MODULE 1 (TYPE 8P) CT/VT MODULE 2 (TYPE 8F)SRC 1 SRC 2 SRC 3 SRC 4Phase current F1 to F3 CT channels(used for 87PC first currentand Breaker Failure 1)Not available L1 to L3 CT channels(used for 87PC secondcurrent and BreakerFailure 2). This source isconfigurable only if asecond CT/VT module isordered.Sum of F1:F3 and L1:L3(used for distance andovercurrent)Ground current F1 (Ground overcurrent) Not available --- ---Phase voltage Not available Not available --- Three-phase line VT fordistance andsynchrocheckAuxiliary voltage Not available Not available Single-phase bus VT forsynchrocheck---NOTE
