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Home : Products & Tech Specs : Power Transmission Systems : High & Low Pressure Fluid Filled Extra High Voltage Cables



Underground Power Cables
With the increase of taller buildings, growing populations, and larger cities, it is difficult to rely on overhead transmission lines to the centers of cities. Fujikura provides various underground power cables from conventional paper-insulated power cables widely used for extra-high voltage lines to newest crosslinked polyethylene power cables.

Paper-insulated power cables
Paper-insulated, oil-filled power cables have a long history of wide application among extra-high voltage power cables. Since 1934, Fujikura has been supplying a quantity of oil-filled cables and installing them worldwide.

Aluminum-sheathed Oil-Filled Cables
Aluminum-sheathed oil-filled cables are used as underground power transmission cables. These cables have good mechanical properties and a large earth fault current rating capacity.

Lead-sheathed Oil-Filled Cables
Lead-sheathed oil-filled cables are used in heavy-duty environments requiring good anti-chemical characteristics, protects cable insulation from water and damaging substances. Care should be taken, the lead sheath is not resistant to mechanical shocks.

Three-core Oil-Filled Cables
Three-core oil-filled cables have good compaction factor, and are an excellent conductor of stable electric power in harsh marine environments.

Pipe-type Oil-Filled Cables
The first installation of 66kV high-pressure pipe-type oil-filled cable (HPOF) in Japan was made by FUJIKURA in 1964. By 1971 FUJIKURA has greatly developed this technology and made the first long distance installation of 275kV HPOF cable in Tokyo Bay.

Oil-Filled Submarine Cables
Oil-filled cables have been used as submarine power transmission cables for years. The high reliability has set operation records through out the world. The conductor temperature is higher than that of mass-impregnated cables, allowing for larger power transmission.



Mass-impregnated Paper Insulating Submarine Cables
Mass-impregnated paper insulation cables do not need oil-feeding system. Therefore this stype of cable is maily applied for long distance submarine cable.
Construction:
1 -Conductor (key-stone type)
2 -Conductor shielding
3 -Insulation (oil impregnated paper)
4 -Insulation shielding
5 -Lead sheath
6 -Plastic jacket
7 -Tape armour
8 -Optical fiber (option)
9 -Steel wire armour
10 -Serving		 Cable Diagram


Voltage Conductor Thickness of conductor shielding Approx. mm Thickness of insulation

Nom.
mm

 Thickness of insulation shielding
Approx. mm		 Thickness of metallic sheath
Nom. mm		 Thickness of plastic jacket

Nom. mm

 Diameter and number of armour Approx. Thickness of Serving

Approx. kg/km

 Outside diameter of cable Approx. mm Weight of cable

Approx. kg/km

 DC conductor resistance

Max.
Ω-km
Nominal operating voltage

kV

 Nominal sectional area

mm2

 Shape Diameter

Nom. mm
DC ± 300 400
800
1000
1200
1600
2000
2500
3000		 Key-stone
type		 23.3
32.9
36.8
40.3
46.6
52.0
58.2
63.7		 0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26		 16.3
13.9
13.2
12.7
12.4
12.1
11.7
11.5		 0.36
0.36
0.36
0.36
0.36
0.36
0.36
0.36		 3.0
3.1
3.1
3.2
3.3
3.5
3.6
3.7		 6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0		 6.0X43
6.0X45
6.0X47
6.0X48
6.0X51
6.0X54
6.0X56
6.0X59		 3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0		  98.7
103.7
122.2
124.9
114.8
120.0
125.6
130.9		 26800
32000
48500
51700
43300
49100
55800
62400		 0.0470
0.0221
0.0176
0.0151
0.0113
0.0090
0.0074
0.0061
DC ± 400  400
 800
1000
1200
1600
2000
2500
3000		 Key-stone
type		 23.3
32.9
36.8
40.3
46.6
52.0
58.2
63.7		 0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26		 22.5
18.5
17.3
16.6
16.0
15.5
14.9
14.5		 0.36
0.36
0.36
0.36
0.36
0.36
0.36
0.36		 3.3
3.3
3.3
3.4
3.5
3.6
3.8
3.9		 5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0		 6.0X48
6.0X49
6.0X50
6.0X51
6.0X54
6.0X56
6.0X59
6.0X61		 3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0		 109.7
111.3
128.8
131.1
120.4
125.0
130.4
135.3		 32200
36000
52900
56000
46700
52100
59100
65600		 0.0470
0.0221
0.0176
0.0151
0.0113
0.0090
0.0074
0.0061
DC ± 500 400
800
1000
1200
1600
2000
2500
3000		 Key-stone
type		 23.3
32.9
36.8
40.3
46.6
52.0
58.2
63.7		 0.26
0.26
0.26
0.26
0.26
0.26
0.26
0.26		 33.4
26.1
24.0
22.8
22.9
23.2
23.4
23.6		 0.36
0.36
0.36
0.36
0.36
0.36
0.36
0.36		 3.8
3.7
3.7
3.7
3.9
4.0
4.2
4.3		 6.0
6.0
6.0
6.0
6.0
6.0
6.0
6.0		 6.0X61
6.0X58
6.0X58
6.0X59
6.0X62
6.0X65
6.0X69
6.0X72		 3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0		 134.5
129.3
145.0
146.1
137.0
143.2
150.2
156.3		 44700
44900
63100
65300
55400
62000
70200
77800		 0.0470
0.0221
0.0176
0.0151
0.0113
0.0090
0.0074
0.0061



Paper-insulated power cables