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5-46 L60 Line Phase Comparison Relay GE Multilin
5.3 SYSTEM SETUP 5 SETTINGS
5
5.3.3 SIGNAL SOURCES
PATH: SETTINGS SYSTEM SETUP SIGNAL SOURCES SOURCE 1(2)
Two identical source menus are available. The "SRC 1" text can be replaced by with a user-defined name appropriate for
the associated source.
“F” represents the module slot position. The number directly following this letter represents 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” 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 six (6) CTs. The first channel displayed is the CT to which all others will be referred.
For example, the selection “F1+F5” indicates the sum of each phase from channels “F1” and “F5”, scaled to whichever 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 each
CT 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.
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 the
specific 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 parameter
may be either fundamental or RMS magnitude, such as phase time overcurrent, two settings are provided. One setting
specifies the source, the second setting selects between fundamental phasor and RMS.
AC Input Actual Values:
The calculated parameters associated with the configured voltage and current inputs are displayed in the current and volt-
age sections of actual values. Only the phasor quantities associated with the actual AC physical input channels will be dis-
played here. All parameters contained within a configured source are displayed in the sources section of the actual values.
DISTURBANCE DETECTORS (INTERNAL):
The 50DD element is a sensitive current disturbance detector that detects any disturbance on the protected system. 50DD
is intended for use in conjunction with measuring elements, blocking of current based elements (to prevent maloperation as
a result of the wrong settings), and starting oscillography data capture. A disturbance detector is provided for each Source.
The 50DD function responds to the changes in magnitude of the sequence currents. The disturbance detector scheme
logic is as follows:
SOURCE 1 SOURCE 1 NAME:
SRC 1
Range: up to 6 alphanumeric characters
MESSAGE
SOURCE 1 PHASE CT:
None
Range: None, F1, F5, F1+F5,... up to a combination of
any 6 CTs. Only Phase CT inputs are displayed.
MESSAGE
SOURCE 1 GROUND CT:
None
Range: None, F1, F5, F1+F5,... up to a combination of
any 6 CTs. Only Ground CT inputs are displayed.
MESSAGE
SOURCE 1 PHASE VT:
None
Range: None, F1, F5
Only phase voltage inputs will be displayed.
MESSAGE
SOURCE 1 AUX VT:
None
Range: None, F1, F5
Only auxiliary voltage inputs will be displayed.