Alstom Reason RPV311, Technical Manual

Page: 176 / 350

Chapter 9
– TW Fault Locator
RPV311
176 RPV311-TM-EN-6
Where:
d:
fault distance from terminal A;
l:
length of the line;
k:
constant of the line attenuation of the speed of the wave;
c:
speed of light
t
a:
time which the traveling wave gets to terminal A
t
b :
time which the traveling wave gets to terminal B
The means to get the COMTRADE files from the RPV311 to the computer where the fault location will be
performed are described in Chapter 5, item 4 - COMTRADE files download.
The TW record is a COMTRADE file with 100ms prior to the trigger plus 1 cycle after the trigger, that means
approximately 117 ms @ 60 Hz and 120 ms @ 50 Hz. The RPV311 takes 2 minutes to create a record and
during that time the device stays in a “BUSY” status and will not record a new TW record until the BUSY
status is finished.