AE101
TDR FILTER FOR CABLE FAULT PRE-LOCATION
TDR filters are used when high resistance cable faults are to be pre-located. The AE101 is connected between the surge generator and the cable under test. A suitable TDR scope is connected to the unit. The surge generator is used to break down the fault and to establish an arc at the fault position, which is then stabilized by the AE101 and allowed to burn for a longer period. While the arc is burning the TDR will send a series of pulses, which is stored and displayed for analysis. The TDR will display a short circuit at the fault position. This stored waveform can be superimposed on top of the waveform displaying the end of the cable allowing for easy cursor placement where the two waveforms split.
PRINCIPLES OF OPERATION
Principles of Operation
The AE101 is connected in series with any standard surge generator and faulty cable which provides the high voltage energy needed to temporarily break down high resistance cable faults. When flash-over occurs at the fault the AE101 will limit the current flowing and allow the arc to burn for a slightly longer period.
The AE101 allows the PCA101 to be coupled through suitable filters to the high voltage high energy pulse. Because burning arcs are always a low resistance, we can now use TDR techniques.
A single TDR pulse is superimposed on top of the HT pulse at the correct time. When the pulse arrives at the burning low resistance arc a short circuit is reflected to the TDR. The waveforms are then simply treated and analyzed as any other TDR waveform when a short circuit is detected.
SPECIFICATION
Input Voltage
32kV Surge Pulse
Input Energy
2.2k Joule
ARC Duration Details
4-5mS @ 8kV
0.5-1mS @ 32kV
Duty Cycle
30 Pulses
20 Munutes Cool Down
Dimensions
500 x 305 x 457 mm 20kg
Enclosure
Pelican Type Case or 308 Stainless Steel where fixed
Test Environment
Temperature Indoor and outdoor: 10ºC to + 45ºC.
Humidity: ≤ 85%
User Connection
BNC Sockets
ACCESSORIES
Accessories
High Voltage Connection Cables
5m Earth lead
Any suitable TDR Scope
