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L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
SYSTEM SETUP
CHAPTER 5: SETTINGS
5
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
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. See the Introduction to AC Sources section at the beginning of this chapter for details.
It is possible to select the sum of all CT combinations. The first channel displayed is the CT to which all others are 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 are summed together.
Figure 5-46: Source configuration for phase comparison
5.4.3.1 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
element specifies which type of parameter to use and provides a setting for source selection. In elements where the
parameter can 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.
5.4.3.2 AC input actual values
The calculated parameters associated with the configured voltage and current inputs are displayed in the current and
voltage sections of actual values. Only the phasor quantities associated with the actual AC physical input channels display
here. All parameters contained within a configured source are displayed in the sources section of the actual values.
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.
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.
SOURCE 1 PHASE VT:
None
Range: None, F5
Only phase voltage inputs are displayed
SOURCE 1 AUX VT:
None
Range: None, F5
Only auxiliary voltage inputs are displayed
Function
CT/VT module 1 (type 8P)
CT/VT module 2 (type 8F)
SRC 1
SRC 2
SRC 3
SRC 4
Phase current
F1 to F3 CT channels (used
for 87PC first current and
Breaker Failure 1)
Not available
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.
Sum of F1:F3 and L1:L3
(used for distance and
overcurrent)
Ground current
F1 (Ground overcurrent)
Not available
---
---
Phase voltage
Not available
Not available
---
Three-phase line VT for
distance and synchrocheck
Auxiliary voltage
Not available
Not available
Single-phase bus VT for
synchrocheck
---
NOTE
When two CTs are connected and configured with these settings, it is imperative that the CT rated secondary
current is identical for both CTs (that is, both CTs are 1 A rated or both CTs are 5 A rated).
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Страница 498: ...7 10 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
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