Thermal analysis of underground electrical power cables buried in non-homogeneous soils

2011 ◽  
Vol 31 (5) ◽  
pp. 772-778 ◽  
Author(s):  
Roberto de Lieto Vollaro ◽  
Lucia Fontana ◽  
Andrea Vallati
Keyword(s):  
Thermal Analysis ◽  
Electrical Power ◽  
Power Cables

The Thermooxidation and Resistance to Moulds Action of Some Polyethylene Sorts Used at Anticorrosive Insulation of the Underground Pipelines

2017 ◽  
Vol 54 (3) ◽  
pp. 447-452 ◽  
Author(s):  
Adriana Mariana Bors ◽  
Nicoleta Butoi ◽  
Alina Ruxandra Caramitu ◽  
Virgil Marinescu ◽  
Iosif Lingvay
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Culture Media ◽  
Power Cables ◽  
Polymerization Degree ◽  
Crosslinking Degree ◽  
Underground Pipelines ◽  
Predominant Process ◽  
Underground Power Cables ◽  
Coupled Techniques

Polyethylene (PE) insulations have a wide applicability in the insulation of both underground pipelines and underground power cables. In this context, by coupled techniques of thermal analysis (TG/DTG+DTA) and microbiological determinations, have been studied thermooxidability and resistance to moulds action of some polyethylene sorts. Following the processing of the experimental data obtained by thermal analysis it was found that during the applied heat treatment (100 grd C), in the first approx. 380 h, there is a growth of LDPE (low density polyethylene) polymerization degree by elongation of the aliphatic chains, after which the predominant process consists in the structure crosslinking. For MDPE (mean density polyethylene) samples, during the thermal treatment applied, it was found that the crosslinking degree of polyethylene (PE) increased without significant molecular weight change (with all the related consequences of increasing the weight of the tertiary and quaternary carbon atoms in the molecule). Microbiological determinations have highlighted that the resistance to filamentous fungal action of LPDE is higher than that of the investigated MDPE. It was found that after heat treatment applied (1000 h and 100 oC), both at LDPE and at MDPE, decreases the resistance to moulds action is decreased. It has also been found that moulds action resistance is substantially decreased when inoculated culture media and PE samples are exposed to an alternative electric field of 50 Hz - 6 Vrms/cm.

Fem-Based Thermal Analysis of Underground Power Cables Located in Backfills Made of Different Materials

2015 ◽  
Vol 47 (5) ◽  
pp. 770-780 ◽  
Author(s):  
P. Ocùoñ ◽  
D. Taler ◽  
P. Cisek ◽  
M. Pilarczyk
Keyword(s):  
Thermal Analysis ◽  
Power Cables ◽  
Underground Power Cables

Testing of Underground Power Cables

2016 ◽  
pp. 288-317
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Current Source ◽  
Electrical Equipment ◽  
Alternating Current ◽  
Power Cables ◽  
Test Procedures ◽  
Electrical Power Systems ◽  
Insulation Systems ◽  
Underground Power Cables

Probably 80% of all testing performed in electrical power systems is related to the verification of insulation quality. This chapter briefly describes the fundamental concepts of insulation testing including – insulation behavior, types of tests, and some test procedures. Most electrical equipment in utility, industrial, and commercial power systems uses either 50 or 60 Hz alternating current. Because of this, the use of an alternating current source to test insulation would appear to be the logical choice. However, as will be described a little later, insulation systems are extremely capacitive. For this and other reasons, DC has found a large niche in the technology. Before we can really evaluate the value of one system as opposed to the other (e.g. AC vs DC), let us examine how each type of voltage affects insulation. Testing of underground power cables are reported by NS161. (2014). IEC 6038. (1979). IEC Standard 60228. (1979). IEC60229. (2007). IEC60230. (1974). IEC60233. (1981). IEC 60332 (1974). IEC 6071 (2008). IEC 60270. (2000), IEC 60287. (2002).

Conversaziones, 1973

1974 ◽  
Vol 28 (2) ◽  
pp. 157-166
Keyword(s):  
Diagnostic Testing ◽  
Electrical Power ◽  
Standard Technique ◽  
Power Cables ◽  
Combustion Chambers ◽  
Insulating Layer ◽  
Double Decker ◽  
Creep Characteristics ◽  
Boiler Tubes ◽  
Conductor Surface

Conversaziones were held this year on 10 May and 28 June. At the first conversazione twenty-six exhibits and a film were shown. Two exhibits were arranged by the Central Electricity Research Laboratories, Leatherhead. The effect on very large boilers of very small traces of impurities was demonstrated by Mr G. M. W. Mann, Dr K. Torrance and Professor J. M. Ward. Modern power station boilers are enormous structures— they cost £10m each, contain 300 miles of metal tubing and have combustion chambers large enough to house 100 double-decker buses. For their trouble-free operation demineralized water has to be used; this is so pure that commonly occurring substances such as iron, copper, sodium and chloride are present only to the extent of a few parts per 1000 million. If the levels of impurities are not carefully controlled, corrosion of the boiler tubes can occur and one faulty tube will put the whole boiler out of action at a cost of £30 000 per day. Recent advances in potentiometry have led to the use of selective ion electrodes for the on-steam monitoring of water quality and these electrodes were demonstrated to show their sensitivity. In addition mechanisms of corrosion were illustrated and typical examples of corrosion displayed. Mr H. K. Beale, Mr C. F. Price and Mr C. N. Reed arranged an exhibit on compression terminations for aluminium conductors. Although aluminium conductors for the electrical power industry are being increasingly used for power cables because of cheapness and lightness compared with copper, they have the disadvantage of being difficult to terminate. This is due to the electrically insulating layer of oxide on the conductor surface, and the creep characteristics of the metal. As a result, terminating aluminium cables by means of the standard technique of lugs compressed on the end of the conductor poses problems not encountered with copper. An outline was given of research now in progress to overcome these problems. A working display of a prototype cartridge-operated tool illustrated the developments that are taking place in compression jointing equipment for speedy field use. A new CERL measuring set for the diagnostic testing of joints in service was demonstrated.

Thermal analysis of power cables in multi-layered soil. III. Case of two cables in a trench

1994 ◽  
Vol 9 (1) ◽  
pp. 572-578 ◽  
Author(s):  
M.A. Hanna ◽  
A.Y. Chikhani ◽  
M.M.A. Salama
Keyword(s):  
Thermal Analysis ◽  
Layered Soil ◽  
Power Cables
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