Method and device for analyzing electric cable networks

Details Method and device for analyzing electric cable networks Method and device for analyzing electric cable networks

2007-07-05

2011-11-22

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S533000

Reexamination Certificate

active

08063645

ABSTRACT:
The invention relates to a method and a device for analyzing electric cables in a network, for the detection and location of defects in networks comprising at least one junction from which there depart N secondary cable stretches. The method includes interposing in the network, in series at the input of each the secondary stretches (T2, T3) starting from the junction (A), a respective bidirectional passive filter (FR2,FR3) able to cut off a frequency band associated with this stretch. The filters all allow through the useful frequencies for the normal operation of the network. A pulsed test is applied to the input of the network signal modulated by N different carrier frequencies each situated in one of the N frequency bands of the filters. The temporal position of test signal spikes reflected for each of the N frequencies is detected, and deducing therefrom the position of possible defects on a stretch of cable of the network.

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Chet Lo and Cynthia Furse, “Noise-Domain Reflectometry for Locating Wiring Faults”, IEEE Transactions on Electromagnetic Compatability, vol. 47 No. 1, Feb. 2005.
Cynthia Furse et al., “Spread Spectrum Sensors for Critical Fault Location on Live Wire Networks”, Journal of Structural Control and Health Monitoring, vol. 12, Issue 3-4, 2005.
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