Pattern Recognition of Partial Discharges on Power Cable Systems

2019 ◽  
pp. 510-520
Author(s):  
Arunjothi Rajendran ◽  
Thirumurthy ◽  
K. P. Meena
Keyword(s):  
Pattern Recognition ◽  
Partial Discharges ◽  
Power Cable ◽  
Cable Systems

Thermodynamic Approach for Identifying Oxidative Processes Insulation Breakdown

2015 ◽  
Vol 752-753 ◽  
pp. 1153-1157 ◽  
Author(s):  
Marina N. Dubyago ◽  
Irina A. Poluyanovich ◽  
Nikolay K. Poluyanovich
Keyword(s):  
Analytical Method ◽  
Partial Discharges ◽  
Power Cable ◽  
Oxidation Processes ◽  
Oxidative Processes ◽  
Cable Systems ◽  
Insulation Breakdown ◽  
Definition Of ◽  
Non Destructive ◽  
Destructive Methods

Problematic issues insulation of power cable systems (PCS) based on the design and development of non-destructive methods are considered in the paper. The basic components of the PCS, destroying the insulation, are determined. The analytical method for assessing the oxidation processes of cellulose with the definition of the most probable is proposed. The approach for identifying the main processes of destruction of the insulation allows more detail to present background to the development of partial discharges (PD) in insulation and to identify measures for minimizing processes that lead to the destruction of the insulation PCS.

Partial Discharges Measurements for Power Cable Insulation System

2016 ◽  
pp. 334-350
Keyword(s):  
Computer Simulations ◽  
High Voltage ◽  
Partial Discharges ◽  
Simple Solution ◽  
Power Cable ◽  
Laboratory Measurements ◽  
Coupling Behavior ◽  
Additional Costs ◽  
Cable Systems ◽  
Detection Unit

On-site PD measurements on high voltage cables have to concentrate on the cable accessories because there is a remaining risk for assembling faults on site. PD sensors with an appropriate coupling behavior to accessory-internal PD give sensitivities of a few pC or even better. Unfortunately, two main reasons prevent the general use of PD sensors in cable accessories. First of all, the costs for PD sensors have to be balanced with the costs of the accessories, importance of the cable link, consequential costs for outage etc. This is the reason why PD sensors were mainly used EHV cable systems. The second reason is limited accessibility: the PD sensor cable at the accessory has to be connected to a PD detection unit. Accessibility is much more difficult for direct buried cable systems than for cable terminations and tunnel-laid cable systems: the senor cable must pass the ground and the end up in a box on the surface to provide access. This solution causes additional costs and new problems like sealing the sensor cable against humidity, capability to withstand sheath testing etc. By looking for alternative access to PD signals from cable joints of long cable systems, a very simple solution proved suitable: detecting PD at cross-bonding links. To investigate the high frequency propagation of PD pulses in cross-bonding links, computer simulations and laboratory measurements were done.

scholarly journals Analysis of an application possibility of geopolymer materials as thermal backfill for underground power cable system

2020 ◽  
Author(s):  
Paweł Ocłoń ◽  
Piotr Cisek ◽  
Marcelina Matysiak
Keyword(s):  
Thermal Conductivity ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Power Cable ◽  
Closed Cycle ◽  
Cable System ◽  
Material Costs ◽  
Cable Systems ◽  
Underground Power Cable ◽  
By Products

Abstract The circular economy is a closed cycle that allows one to reuse the industrial waste, as well as minimize the energy and resources losses during the production process. This paper presents an innovative idea of the application of a geopolymer cable backfill for underground power cable system installation. The closed cycle, in this case, is formulated as follows: the primary resource is the waste from the combustion of fossil fuels, i.e., fly ash that is utilized to form the geopolymer matrix. The geopolymer then is used as thermal backfill in underground power cable systems. Utilization of combustion by-products in the form of a geopolymer is a highly profitable solution since landfill waste disposal, in this case, generates considerable costs for the electrical energy producers. In typical applications, geopolymers are used as insulators. By adding individual components, the thermal conductivity of 2.0 W/(m K), higher than of typical thermal backfills (Fluidized Thermal Backfill), which value is close to 1.5 W/(m K), is reached. What is very important, geopolymers can absorb water better than typical sand–cement mixtures. As a result, a high thermal conductivity with the temperature increase is maintained. The application of geopolymers as thermal backfills has the potential to improve the flexibility of underground power cable systems, as well as to minimize the material costs of installation. The case study is presented to show the economic benefits of using the combustion by-products as a geopolymer thermal backfill. The finite element method model of an underground power cable system is developed, and optimization of backfill dimensions is provided to minimize the material costs using the geopolymer thermal backfill and to maximize the underground power cable system performance. The main result of this paper is that the application of geopolymers leads to a decrease in underground power cable system costs, compared to traditional backfill (sand–cement mixture). The reason is the higher value of thermal conductivity, which allows selecting a cable with a smaller cross-sectional area. Also, the environmental benefits of geopolymer application for cable bedding are discussed. Graphic abstract

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