Self-contained Oil-filled Cables Research Articles

Evaluation of HVDC cables for the St.-Lawrence River crossing of Hydro-Quebec's 500 kV DC line. II. Cable testing facility for dielectric and accelerated aging

For pt.I see ibid., vol.7, no.2, p.1034-42 (1992). A description is presented of the cable testing facility at IREQ for long-term accelerated aging tests on HV cables. This test facility was required as part of an extensive program to evaluate the high-voltage cables for the river crossing of Hydro-Quebec's transmission lines, rated at 800 kV AC and +or-500 kV DC. The specific dielectric constraints resulting from the insertion of a short length of cable into a long line are described, and the circuits developed for the special tests, which reproduce the specific cable test conditions, are discussed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Analysis of thermomechanical bending of self-contained oil-filled cables in ducts

An analytical method is presented for a complete study of the thermomechanical bending effects in underground HV (high-voltage) cables, confined in individual ducts, during daily temperature cycles. A segment of cable between two successive manholes is isolated, the structural continuity being maintained by equivalent axial springs at both ends. Up to a certain temperature, the central part of the segment remains completely restrained in the axial direction by the end forces added to the friction between the moving end sections of the cable and the supporting duct. Beyond this temperature, the entire segment moves axially. Cables rigid in bending remain straight, but more flexible ones assume a post-buckling deformed shape under the axial thrust. The resulting displacements, strains, and forces are calculated for evaluation of the cable fatigue. Parametric studies are presented for two typical self-contained cables to assist in the optimum design of underground power lines. >

An Annotated Summary Of Analysis And Design Techniques For Pipe-Type Cable Systems

In recent years significant advances have been achieved in the design and development of under- ground transmission and distribution cables in terms of ampacities and operating voltages. Self-contained oil-filled cables and pipe type cables are the dominant designs in most countries for underground systems of 132 kV and above. They have been used at voltage levels up to 550 kV and cables for the 750 to 1200 kV range are now being considered. This paper presents a summary of the available literature on pipe-type cables which have superseded the self-contained oil- filled cables in the USA. The important design and operation parameters are described and the various computational methods used to determine electrical losses and ampacities are discussed.

Development and Actual Use of 275KV Low-Loss Self-Contained Oil-Filled Cables with Laminated Paper Insulated

This paper summarizes the development of two kinds of new 275kV self-contained oil-filled cables which are insulated with Polypropylene Laminated Paper (PPLP) or Fluorinated Ethylene Propylene Copolymer Laminated Paper (FEP/C) and kraft paper, respectively. Prototype cables were manufactured, tested in the factories, and subjected to an accelerated longterm (1-1/2 year) field test. After the successful field test, these two kinds of cables have been utilized in a main commercial transmission line of the Kansai Electric Power Co., Inc. since November 1982.

Development and Actual Use of 275 kV Low-Loss Self-Contained Oil-Filled Cables with Laminated Paper Insulation

Development and Actual Use of 275 kV Low-Loss Self-Contained Oil-Filled Cables with Laminated Paper Insulation

Insulation Design of Self Contained Oil-Filled Cables for D.C. Operation

Results of studies on the effect of different insulation constructions and loading conditions on the design of self-contained oil-filled cable are given. It is shown that insulation performance and current loading are interrelated and that performance of the cable under transient voltage conditions can be improvment by adopting an insulation made up of different density papers-allowance being made for the differing thermal and electrical properties of these papers. However full benefit of this construction is not necessarily achiev able because of possible limitations on long time d.c. strength of some of the grades and thicknesses of paper.

Insulation Properties of 250 KV DC XLPE Cables

The difficulty of obtaining the electric power generation sites close to the city forces us to install long transmission lines and to adopt dc transmission. During the execution of the Hokkaido-Honshu dc submarine cable project, 250 kV class XLPE dc cable was developed in parallel with self-contained oil-filled cables. While XLPE dc cable samples were subjected to a modified CIGRE Recommendation type test for a long term, insulation breakdown occurred frequently.

Insulation Properties of 250 kV DC XLPE Cables

The difficulty of obtaining the electric power generation sites close to the city forces us to install long transmission lines and to adopt dc transmission. During the execution of the Hokkaido-Honshu dc submarine cable project, 250 kV class XLPE dc cable was developed in parallel with self-contained oil-filled cables. While XLPE dc cable samples were subjected to a modified CIGRE Recommendation type test for a long term, insulation breakdown occurred frequently.

230 KV Self-Contained Oil-Filled Cable Line Installed Underneath a Bridge Located in Maracaibo, Venezuela

This paper discusses the features of the design, test, manufacture and installation of 230 kV self-contained oil-filled (OF) cables and the system installed underneath a bridge crossing the mouth of Lake Maracaibo in Venezuela.

275 KV Self-Contained Oil-Filled Cable Insulated With Polymethylpentene Laminated Paper

275 KV Self-Contained Oil-Filled Cable Insulated With Polymethylpentene Laminated Paper

275 KV Self-Contained Oil-Filled Cable Insulated with Polymethylpentene Laminated Paper

This paper described the newly developed insulating paper, which has very low dielectric loss and high dielectric strength, and electrical and mechanical properties of the cable with this paper. The insulating paper, which is called PML, consists of one layer of polymethylpentene and two layers of cellulose paper laminated. PML has several features such as not only low dielectric loss of 2.8x 0.001 as e * tan 6 and high dielectric strength but also poor swelling and excellent heat resistance. The PML was even swelled and increased several per cent of its thickness after immersing in oil with 100 °C for 24 hours. To cope with the swelling of the paper, we had to adopt a new manufacturing technique to produce a self-contained 275 kV and 500 kV oil-filled cable. Tests were carried out on a 275 kV PML insulated OF cable, and we obtained the test results as follows: .tan s was 2.76 x 0.00076, A. C. breakdown stress was 54 kV/mm and impulse breakdown stress was 149 kV/mm. The testresults proved that 275kV OF cable could be satisfactory used in service.

Development of 500 KV DC Self-Contained Oil-Filled Cable

This paper gives some observations on the insulation properties and on the type test method of ±500kV self-contained oil-filled(OF) dc cable including some accessories. The cable and accessories were subjected to a withstand test at the factory laboratory, to a type test recommended by CIGRE SC-21 for dc cable (abbreviated as CIGRE Type Test) for a short sample and to a long-run test on a long cable sample at Takeyama Cable Testing Station. At the first step some cables experienced breakdown, however, at the final stage all cables successfully withstood the above tests and also the more severe supplementary tests.

Development of 500 KV DC Self-Contained Oil-Filled Cable

Development of 500 KV DC Self-Contained Oil-Filled Cable

400 kV Cable Installations in Mexico

As a consequence of the development in the recent years of the Mexican 400 kV grid, the first two 400 kV cable installations in Mexico were carried out at Infernillo and Angostura Power Plants. In both installations self-contained oil-filled cables were chosen. After a general description of the plants, the cable and accessory design is discussed. Particular reference is made to laying problems, especially for the Angostura 130 m vertical shaft installation.

Self-Contained Oil-Filled Cables for High Power Circuits

The self-contained oil-filled cable has been developed to meet increasing power requirements both in terms of voltage and ampacity. The paper gives details of power transmission capability for 230, 345 and 525 kV cable systems for a variety of natural and forced cooled conditions. The highest rating is obtained with internal oil cooling and at 525kV 4000 MVA can be transmitted using one cable per phase. Details are given of accessory design features that have been adopted to ensure that these components do not become a limitation to power transmission capability.

Design and test of a flexible EHV cable connection for a floating plant

Transmission cable connections to an offshore floating plant present unique flexing problems due to motions of the plant during storm conditions even though the plant is moored in the basin of a protective breakwater. This paper deals with strains in the cable due to flexing, and the flexible arches designed to distribute those strains at the hinges of a three-hinged support system. Structural details of the support system are not discussed. Analysis and test data are presented to prove the feasibility of utilizing self-contained oil-filled cables for an overhead EHV flexible cable connection to a floating plant.

Discussion on “Self-contained oil-filled cables. A review of progress”

Discussion on “Self-contained oil-filled cables. A review of progress”

Self-contained oil-filled cables. A review of progress

Since the publication of a progress paper on oil-filled cables in 1961, continuous intensive research and developments have been carried out covering all the elements forming the cable, accessory design, technology. and system design as well as the new fields of application to d.c. land and both a.c. and d.c. long submarine connections. For each of these items the paper gives the highlights and concludes with an estimate of the limit of power which it may be possible to transmit with this type of cable.

Self-Contained Oil-Filled Cables for High Power Tranmission in the 750-1200 kV Range

This paper shows how the well proved self-contained oil-filled paper insulated cable, with the technological improvements continuously introduced in the recent years, and with the use of intensive forced cooling can provide a reliable means for the transmission of several GVA at the highest voltages now being considered (750-1200 kV).

Development of 500 kV Self-Contained Oil-Filled Cable for Outgoing Lines from Power Plants

The installation and maintenance of 500kV oil-filled cable used either as outgoing line from hydraulic, steam or nuclear power plants, or as connectors for metal-enclosed compact substations, are quite different from that of ordinary transmission line. Extensive factory and field testing of a 500 kV self-contained oil-filled cable and its accessories has resulted in a cable system of the highest quality and reliability.