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CATAGORY: Home -> Cable-News -> Development of XLPE insulated Submarine cable

Development of XLPE insulated Submarine cable

XLPE Insulated Cable (XLPE)

XLPE Insulated submarine cable developed in the 80 's, most used for 220kV and below voltage rating [1], its manufacturing and operating experience is far less than the oil-filled submarine cable. As of today, the most voltage-rated XLPE AC submarine cable is the NEXANS company, which is 2.2km long 420KV4 root cable for the large Ormenlange gas field in the Norwegian Sea. 500kV AC long-distance submarine cable, currently used only oil-filled cable.

Compared with the oil-filled cable, XLPE cable has the following advantages:

Submarine cable

XLPE cable is solid insulation, does not need the complex oil filling system, does not have to detect the oil level, the control pressure, the running cost is low;

XLPE Cable No lead sheath, small bending radius, light weight, can be produced, laying longer, and in the installation and transportation of the installed than the oil-filled cable simple;

The electrical and mechanical properties of XLPE submarine cables are superior to those of oil-filled cables. Because of this, the development of XLPE insulated submarine cable has a wider prospect, but there are many technical problems still need to be solved. Ordinary XLPE cable under the action of DC voltage, the space charge in cable insulation will be concentrated somewhere, thus causing the local field strength to be too high and being penetrated. The use of additives in insulating materials can slow the accumulation of space charge in cable insulation, making XLPE cables available for DC High-voltage power supply. 2002, the first squeeze-type mono-core DC submarine cable (light DC cable, ABB, Sweden), voltage ±150kv, length 40km, capacity 330MW, used to connect New York Long I. and Connecticut, USA. This kind of DC submarine cable is extruded into unipolar cable using 3-layer polymeric material, and the inner and outer shielding layer is extruded with insulating layer simultaneously, which has the advantages of high strength, environmental protection and easy burial, and is applicable to the deep sea and other harsh environments.

XLPE Insulated DC submarine cable is the highest voltage can reach 320kV AC cable insulation in the equivalent capacitance increases with the length of the cable, in the energy transmission process, the equivalent capacitance and the power supply between the charging discharge, its charging current can reach maximum value and affect the normal active load transmission, So the AC submarine cable has a theoretical limit.

Transmission distance, several sea-crossing projects show that the distance is about 40km[3], and over this distance, the use of AC transmission power is not economical. The DC cable length is not limited by charging current, no reactive power compensation device, simple manufacture and installation, low dielectric loss and conductor loss, and good market prospect. However, the high voltage DC submarine cable is like the space charge accumulation mechanism and its restraining method, the insulation aging mechanism under DC voltage, the long-term stability of the newly developed insulating material, the influence of PD and so on. "

General ultra-high voltage AC submarine cable is Dancen, but because 3 heart AC submarine cable can save production and laying costs, so large section,

The high voltage level of 3-heart XLPE AC submarine cable is also being gradually promoted. In 2008, Nike installed the world's first 3-heart XLPE insulated submarine cable with a voltage of up to 245kV in Canada. Polyethylene (PE) insulated cable and EPR (ethylene-propylene rubber) Insulated cable ethylene-propylene rubber cable and Xlpe cable (tgδ≤0). 0005 compared with the dielectric loss tangent value tgδ, and dielectric constant ε are relatively large, but compared with polyethylene cable can prevent branch and partial discharge, generally used only for medium voltage submarine cable. Up to now, the highest grade ethylene-propylene rubber submarine cable was installed in 2001 in Venice, Italy-Murano-Mestre (venezia-murano-mestre) 150kV submarine Electricity