Submarine power production installations use the power of the ocean to generate renewable energy for the population to use. To bring this electricity back to land, use of electrical cables is required. The choice of cable will affect both the quality of received power and the security of the transmission line. To find the inductance and capacitance of these submarine transmission lines, a study of the electric and magnetic fields that are produced due to the power flow on these cables must be performed. The armor that is used to protect the cable from underwater hazards is significant in determining the cable losses and finding the equivalent inductance and capacitance. Finding the inductance and capacitance of the submarine cable will allow for the determination of the two port parameters of the cable. These parameters will allow for the analysis of the transient and steady state performance of the cable.

Les câbles sont utilisés de plus en plus pour le transport et la distribution de l’électricité en courant alternatif sur des distances de plus en plus longues. La prolifération de fermes éoliennes offshore qui nécessitent d’interconnexions avec le continent a aussi propulsé leur utilisation sous-marine. Modèles de câbles sont disponibles dans le bien connu logiciel Electro Magnetic Transient Program et sont destinés au domaine temporel. Ces modèles sont assemblés en utilisant différentes techniques, mais tous nécessitent une connaissance précise des paramètres des câbles dans le domaine fréquentiel. Dans ce but, pour le calcul des impédances des câbles tripolaires cette thèse propose une méthode qui améliore la prise en compte de la proximité entre tous les conducteurs : il s’agit d’une méthode semi-analytique qui utilise le concept duale de fils minces et sous-conducteurs pour décrire la densité de courant à l’intérieur des conducteurs et le calcul des impédances. L’effet du retour par la mer est aussi analysé et une méthode quasi Monte Carlo est proposé, afin de résoudre les intégrales qui décrivent la formulation des impédances pour le sol à deux couches (la mer et son fond) sur lequel ces câbles sont posés. L’effet du à la présence des couches de semi-conducteur dans les câbles est aussi traité. La méthode de collocation stochastique est aussi décrite et appliquée, afin de prendre en compte la variabilité des paramètres d’entrée. / Cables are extensively used for underground alternating current electricity distribution and progressively over longer distances ; the proliferation of offshore wind farms which require interconnections with the mainland has also increased their use underwater. Models of cables are available in the well-known Electro Magnetic Transient Program software and are designed to the time-domain. These models are assembled using different techniques but all of them need a precise knowledge of the frequency domain parameters of the cables. Accordingly, for the calculation of the impedances of three-core submarine power cables this thesis proposes an improved method to consider the proximity effect between all conductors. The method, which is a semi-analytical, uses the dual concept of thin-wires and sub-conductors to describe the current density inside the conductors and the calculation of the impedances. The effect of the sea return is also analyzed and a quasi Monte Carlo method is proposed, to solve the integrals describing the impedances formulations for the two layer soil (the sea and seabed) upon which the submarine cables are laid. The effect due to the presence of semi-conducting layers in the cables is also treated. The stochastic collocation method is also described and applied, in order to account for the variability of the input parameters.

In this thesis, the Mechanical properties of polypropylene yarn of outer protection layer on Submarine High Voltage Cable, twisted around submarine cable,is determined on various conditions at ABB Company. In the first step, tensile tests are done with polypropylene yarn specimens with and without Bitumen at Room temperature. In the second step,tensile tests are done with polypropylene yarn specimens with and without Bitumen and with knotted polypropylene yarn namely: the Fishermen’s knot, the Weaver’s knot, the Square knot and the Overhand knot at Warm Condition (60˚c) and Cold Condition(-5˚c). In the final step,it is proposed to obtain numerical solution using FEM analysis with ABAQUS Software to obtain the hoop stress , the yarn stresses from twisting cable and analyzing of the cylindrical buckling in the buckling torsion and buckling bending on the outer layer of submarine cable with polypropylene material that is mixed with Bitumen.

本論文探討臺灣在中日締結馬關條約被割讓予日本之際，由清廷臺灣巡撫劉銘傳時期所鋪設完成的閩臺海底電線，如何讓售日本的過程。在1895年6月馬關條約規定中日兩國應於締約後的2個月時間完成臺灣之移交，然而日方全權代表樺山資紀卻突然向中方全權代表李經方提出閩臺電線一併移交日本的要求，因此展開中日交涉閩臺電線歸屬之外交問題，使得閩臺電線問題成為甲午戰後中日之間遺留下來的臺灣問題。1898年12月7日，中日訂定閩臺電線讓售合同，解決閩臺電線之歸屬問題。從此以後，閩臺電線才正式屬於日本所有。 　　本研究之結果發現，閩臺電線之中日交涉問題與甲午戰後東亞國際情勢之發展有密不可分的關係。例如當時居於弱勢的中國聯合英國大東電報公司與丹麥大北電報公司，讓日本無法將新得到的閩臺電線進一步向福建內陸延長，確保中國對外電報之自主權。最後就是1904年2月爆發日俄戰爭，臺灣總督府為了搶修受損的閩臺電線，不顧中國福州海關的意見，將閩臺電線修復，差點引發另一場中日糾紛。從日俄戰爭到1945年日本投降為止，以閩臺電線為中心，臺灣成為日本海外電信的樞紐據點。 / In 1895, the Qing Dynasty was forced to sign the Treaty of Shimonoseki(馬關條約) and cede Taiwan to Japan after losing the Sino-Japanese War of 1894-1895(中日甲午戰爭). According to agreement to transfer of Taiwan all question relating to the submarine cable between Fuchow and Tamsui(福州到淡水的海底電線：閩臺海底電線)are to be settled afterwards by both Government. In 12.7,1898, to signed a Convention of the submarine cable between Fuchow and Tamsui(閩臺電線讓售合同)by China and Japan, the submarine cable belonged to Japan. According to the research of the thesis, the negotiations between China and Japan upon the submarine cable between Fuchow and Tamsui correspond to the situation of North-East Asia after Sino-Japanese War of 1894-1895. Finally, from the Russo-Japanese War to Surrender of Japanese in 1945, Taiwan became the hub of Japanese Overseas telecommunications with the submarine cable between Fuchow and Tamsui.