RPV311
Chapter 6
– Records
RPV311-TM-EN-7
137
3.2
Sampling Rate and Acquisition
The acquisition module RA333 has 3 independent channels (one circuit A, B, C), with
an 8 bit A/D converter. The sampling frequency acquisition is 5 MHz, synchronized by
a PPS signal, which means one acquisition each 200 ns.
The acquisition module conditions the line voltage signal. With an efficient band-pass
filter the passing frequency is limited between 1 kHz and 1 MHz.
The module constantly acquires signals and storing the measured values locally in a
64 Mbytes RAM (approximately 4 seconds). The data is written into a circular buffer
where the oldest data will be overwritten by the latest until a threshold violation
occurs.
On detecting violation of the threshold, the memory writing is interrupted. The
memorized data is sent to the processing module at this moment. The complete
transfer of data takes about 2 minutes, and in this time the B
USY
indicators are lit.
While data is being transferred to the processing module (2 minutes), new TW
records will not be registered;. During this time, the other acquisition and processing
modules continue functioning normally.
3.3
Recording Times
The recording parameters are fixed and the record has 100 ms before the violation of
the limit and one cycle after, approximately 117 ms at 60Hz and 120 ms at 50 Hz. The
duration of recording may vary slightly but this does not cause in implications for
fault location.
4
Steady-State Records
Steady-state records can be created by the following means:
Average Series;
Harmonics;
Flicker.
4.1
Average Series
The equipment continuously records averaged values of
Values of average series recorder
RMS (voltage)
Simple average
RMS (current)
Simple average
Voltage imbalance
Simple average
Frequency
Simple average
Voltage total harmonic
distortion
Quadratic average
Summary of Contents for RPV311
Page 2: ......
Page 44: ......
Page 99: ...RPV311 Chapter 5 Operation RPV311 TM EN 7 99 Figure 46 Status monitoring sequence ...
Page 101: ...RPV311 Chapter 5 Operation RPV311 TM EN 7 101 Figure 47 Monitoring sequence ...
Page 142: ......
Page 149: ...RPV311 Chapter 9 TW Fault Locator RPV311 TM EN 7 149 Figure 75 TW Fault Location example 1 ...
Page 152: ......
Page 160: ......
Page 162: ......
Page 164: ......
Page 204: ......
Page 265: ...Chapter 17 Technical Specifications RPV311 RPV311 TM EN 7 265 Figure 142 RPV311 Dimensions ...
Page 279: ...RPV311 Appendix A Equipment Log RPV311 TM EN 7 279 ...