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Signal Sources - GE L60 Instruction Manual

Line phase comparison system, ur series.
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5.3 SYSTEM SETUP

PATH: SETTINGS
SYSTEM SETUP
 SOURCE 1
Identical menus are available for each source. The "SRC 1" text can be replaced by with a user-defined name appropriate
for 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" 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 all CT combinations. The first channel displayed is the CT to which all others will be
5
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.
Table 5–7: SOURCE CONFIGURATION FOR PHASE COMPARISON
FUNCTION
Phase current
F1 to F3 CT channels
(used for 87PC first current
and Breaker Failure 1)
Ground current
F1 (Ground overcurrent)
Phase voltage
Auxiliary voltage
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).
NOTE
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.
5-72


SIGNAL SOURCES

SOURCE 1 NAME:
SRC 1
SOURCE 1 PHASE CT:
MESSAGE
None
SOURCE 1 GROUND CT:
MESSAGE
None
SOURCE 1 PHASE VT:
MESSAGE
None
SOURCE 1 AUX VT:
MESSAGE
None
CT/VT MODULE 1 (TYPE 8P)
SRC 1
Not available
Not available
Not available
Not available
Not available
Not available
L60 Line Phase Comparison System
SOURCE 1(4)
Range: up to six alphanumeric characters
Range: None, F1, F5, F1+F5,... up to a combination of
any 6 CTs. Only Phase CT inputs are displayed.
Range: None, F1, F5, F1+F5,... up to a combination of
any 6 CTs. Only Ground CT inputs are displayed.
Range: None, F5
Only phase voltage inputs will be displayed.
Range: None, F5
Only auxiliary voltage inputs will be displayed.
CT/VT MODULE 2 (TYPE 8F)
SRC 2
SRC 3
L1 to L3 CT channels
(used for 87PC second
current and Breaker
Failure 2). This source is
configurable only if a
second CT/VT module is
ordered.
---
---
Single-phase bus VT for
synchrocheck
5 SETTINGS
5.3.3 SIGNAL SOURCES
SRC 4
Sum of F1:F3 and L1:L3
(used for distance and
overcurrent)
---
Three-phase line VT for
distance and
synchrocheck
---
GE Multilin

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