Three Terminal Line Application - GE RPV311 Technical Manual

Chapter 9 – TW Fault Locator
5

Three Terminal Line Application

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The most complete test would be using two sets of RPV311+RA333:
1. Make sure that both RPV311 are properly time synced. For conditions that
are more realistic, the sync sources could be independent;
2. Configure a line arbitrarily long on the RPV Manager or TW Fault Locator
software connecting the two sets of equipment;
3. Configure the TW register to be triggered by an undervoltage threshold in
both RPV311;
4. Connect three phase voltage to the TW analogic inputs in both RPV311
though a circuit-breaker or test switch;
5. Switch off the circuit-breaker (or test switch), both RA333 should indicate the
BUSY state, showing that the TW is being processed. register is being
processed;
6. Download both files to a computer with the TW Fault Locator tool installed.
7. Run the TW Fault Locator tool to find the fault location (Procedure described
RPV311 manual, in topic 14.5). The fault location should be 50% of the line.
Alternatively, it is possible to useone RPV311 and two RA333 connected to the same
RPV311. Taking care when creating the powerline file, in which only the "line"
parameter will be different, for example:
<terminal_a>LOCATION,IDENTIFIER,LINE_A</terminal_a>
<terminal_b>LOCATION,IDENTIFIER,LINE_B</terminal_b>
Another possibility that also tests the acquisition system of the RA333 module, is to
use only one RPV311+RA333 and configure the powerline file with the same
parameters for both terminals, for example:
<terminal_a>LOCATION,IDENTIFIER,LINE_A</terminal_a>
<terminal_b>LOCATION,IDENTIFIER,LINE_A</terminal_b>
In this case, the TW fault locator tool will use the same file for both ends locating the
fault.
For all the previous mentioned tests, the algorithm shall point the fault location at
50% of the line length, as we are using with very short cable lengths or using the
same TW register for both ends.
The figure below shows a line of three-terminal. The Terminal A, B and C (sources X, Y
and Z respectively).
RPV311
RPV311-TM-EN-7