Sampling Rate; Re-Trigger And Record Concatenation; Trigger Burst Limiter; Traveling Wave Fault Records - GE RPV311 Technical Manual

Chapter 6 – Records
2.3

Sampling Rate

2.4

Re-trigger and Record Concatenation

2.5

Trigger Burst Limiter

Traveling Wave Fault Records

3
3.1

Pre-conditions

136
The Maximum Record time configures the maximum duration that the register can
reach. If consecutive retriggers or a sustained fault happens, the Maximum Record
time establishes the limit of time that the COMTRADE file will register.
The maximum duration of the disturbance record is 20 minutes.
The trigger and continuous recorder sampling rate is one-per-cycle.
Both analog and digital inputs are recorded at the same sampling rate depending on
the type of recorder.
Two records will be concatenated if the disturbance recorder is re-triggered and
there is an overlap between the post-fault time of the first record and the pre-fault
time of the second record.
There is an user-configurable trigger burst limiter for the disturbance recorder which
is identical to the fault recorder limiter.
Faults in a transmission line cause transients traveling along the line as waves
composed of by a frequencies ranging of a few kilohertz to several megahertz.
These traveling waves have a wave front with a very fast rise time and a down time
which is relatively slow. The waves move at speeds near that of light, away of the
fault point toward the end points of the line.
The waves are not limited to the transmission line where the fault occurred,
spreading through the adjacent electrical system with decreasing amplitude, the
result of the combined effects of the impedance of the line and successive
reflections.
Fault location by traveling waves is based on accurate determination of the moment
that the wave fronts pass the two terminals of the line. The traveling wave recorder
can be triggered by a Boolean equation.
The traveling wave fault location requires that a second equipment with the same
functionality is installed at the other end of the monitored power line.
Both units have to be synchronized by an IRIG-B signal with less than 100 ns jitter.
Specific traveling wave fault location software must be installed in the user´s
computer. This software, using the traveling wave records of both terminal lines and
the power line parameters, executes the fault location algorithm and shows the fault
location estimation. For details about the Traveling Waves Fault Locator software,
please refer to Chapter 12: Software – RPV Tools and Chapter 13: Software – RPV
Manager.
RPV311
RPV311-TM-EN-7