CHAPTER 5: SETTINGS
SYSTEM SETUP
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
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5
5.4.3 Signal sources
SETTINGS
SYSTEM SETUP
SIGNAL SOURCES
SOURCE 1(4)
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 5-66: Source configuration for phase comparison
When voltage is supplied to the relay through a VT, it is advisable to assign a source configured with a phase VT
voltage (source 3 or 4) to track system frequency from voltage. Assign source 1 to track frequency from current.
SOURCE 1
SOURCE 1 NAME:
SRC 1
Range: up to 20 alphanumeric characters
SOURCE 1 PHASE CT:
None
Range: None, F1,... up to any 6 CTs. Only Phase CT
inputs are displayed.
SOURCE 1 GROUND CT:
None
Range: None, F1,... up to any 6 CTs. Only Ground CT
inputs are displayed.
SOURCE 1 PHASE VT:
None
Range: None, L5
Only phase voltage inputs are displayed
SOURCE 1 AUX VT:
None
Range: None, L5
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
---
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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