Proximity Coupled Interdigitated Sensors to Detect Insulation Damage in Power System Cables

Proximity coupled interdigitated sensors are introduced to detect insulation damage in power system cables. A new empirical model for interdigitated sensors with conducting backplane is developed. The validity of this newly proposed model is verified by comparing the results obtained from the new model with simulation and experimental results. It is shown that while the existing models fail to correspond to the simulation and experimental results due to the presence of the conducting backplane, the new model can fairly approximate the effect of the backplane on the sensor performance. A meander and a quarter-circular sensor are designed for insulation damage detection. Measurement results on planar dielectric materials, as well as practical power line cables are presented to demonstrate the usefulness of these sensors. Such sensors placed on microrobots crawling along power cables could lead to the potential autonomous monitoring of an electric power system.

[1]  Robert J. Ross,et al.  Inception and propagation mechanisms of water treeing , 1998 .

[2]  Kishore Sundara-Rajan,et al.  Interdigital sensors and transducers , 2004, Proceedings of the IEEE.

[3]  S. Drost,et al.  Optimization of the geometry of gas-sensitive interdigital capacitors , 1991 .

[4]  J. H. Lang,et al.  Operation of microfabricated harmonic and ordinary side-drive motors , 1990, IEEE Proceedings on Micro Electro Mechanical Systems, An Investigation of Micro Structures, Sensors, Actuators, Machines and Robots..

[5]  A.A. Al-Arainy,et al.  Statistical evaluation of water tree lengths in XLPE cables at different temperatures , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  M. Shuvalov,et al.  Analysis of water trees in power cable polymeric insulation , 2003 .

[7]  E. F. Steennis,et al.  Water treeing in polyethylene cables , 1990 .

[8]  Bing Jiang,et al.  Robotic monitoring of power systems , 2004, IEEE Transactions on Power Delivery.

[9]  Michael Christian Wohnsen Coln.  A high performance dielectric measurement system , 1985 .

[10]  Alexander V. Mamishev.  Interdigital dielectrometry sensor design and parameter estimation algorithms for non-destructive materials evaluation , 1999 .

[11]  N. F. Sheppard.  Design of a conductimetric microsensor based on reversibly swelling polymer hydrogels , 1991, TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers.