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The connection cable Type SIWO-KUL™ is a very flexible single core cable. It is manufactured in the voltage range of 1.1 kV, 3.3-4.2 kV, 6.6-7.2 kV and 13.8-15.0 kV.
The SIWO-KUL™ cable is used where high flexibility is required and high temperature conditions are present.
It is therefore a suitable connection cable for high voltage machines like:
This product is also part of our Windlink® offer dedicated to wind turbines.
The operating temperature for continuous service extends from –55°C up to 180°C.
1. Copper conductor tinned, flexible IEC 60228, class 5 2. Tape (up 16 mm2), Semi-conductive layer (only for 6.6 and 13.8 kV) 4. Silicone rubber insulation 7. Separator tape 8. Protective synthetic yarn braiding, varnished
The use of silicone rubber, a high grade corona resistant insulation material, gives the cable excellent dielectric strength. The braided synthetic yarn covering, which is applied directly over the insulation, gives the cable, because of its short braiding pitch and high compactness, an excellent mechanical protection by maintaining good flexibility.
The varnishing of the braiding results in good antifriction properties, high abrasion resistance and excellent chemical resistance against transformer oil, light fuel oil and most types of cleaning agents.
In the event of fire, no corrosive and toxic gases will be given off. Hence, damage caused by fire can be kept to a minimum. Compared with other plastic insulated cables, SIWO-KUL™ generates only little smoke and is therefore defined as «low smoke grade» according to the «Guideline for fire regulations». Of course, the cable meets the requirements concerning fire propagation specified in IEEE 383 and IEC 60332-3 respectively. According to the French specification N.F.F.16.101, this cable is BF1 approved which means that it is in compliance with requirements for cables used in the internal wiring of rail cars.
Under the influence of flames the silicone rubber reduces to silicone oxide, which is an excellent electrical insulator. Because of this chemical reaction a relatively long functional endurance under fire conditions can be achieved. Test according to IEC 60331 and VDE 0472 part 814, at rated voltage, show a function time of at least 30 minutes. The insulation wall thickness has been designed taking into consideration the high dielectric strength of silicone rubber. The breakdown voltage of the finished cable is at least twice the value of the test voltage. The cable meets the requirements of UIC 895 and, concerning dielectric strength, BSS 6195 Type 5, voltage categories C, D, E and F.
These cables are UL (Underwriters Laboratories inc.) approved for Appliance Wiring Material (AWM), following styles 3640, 3641, 3642 and 3643, CSA File No.: 036040-0-000. SIWO-KUL™ cables are in compliance with EU directive on the limits of certain metals and waste as defined on ROHS (Restriction of Hazardous Substances) and WEE (Waste from Electrical and Electronic Equipment). SIWO-KUL™ is REACH conform substances benzene, C10-C13).
Immersion medium
Time
Temp.
Hardness
Tensile
Elongation
Volume
Suitability
(d )
( °C )
change points
change ( % )
change ( %)
General oils
ASTM N°1 Oil
3
25
nil
---
G
7
150
-6
+8
ASTM N°3 Oil
24
-5
+15
S
IRM-902 Oil
23
-12
-14
+5
IRM-903 Oil
-7
-11
+18
Automotive fuids
AMOCO Super 10W-30
250h
-18
-21
5
+23
Wagner 21B Brake Fluid
Delco Supreme 550
70h
-4
-25
+4
Hydraulic Fluids
Aerosafe 2300 (Staufer)
-26
-17
+21
Skydrol 500B (Monsanto)
70
-9
+3
+10
Transformer oils
Askerol Transformator Oil
35
-20
-15
Interteen Transformer Oil
-10
Special oils
ANG 15 Industrial grease
Delco N°9
100
Turbo Oil N°35
71
Gear Oil - Ucon
Solvents
Acetone
+25
Butyl Alcohol (Butanol)
Diacetone Alcohol
Ethyl Alcohol
Silicone Fluids
200 Fluid / 6000 centistokes
1
Dow Corning 510 Fluid
+35
BS
Dow Corning 550 Fluid
Silicone Greases
Dow Corning 44L Grease
Heat Sink Compound 304
+11
Food Products
Beer
22h
Butter
Cola Syrup
Coffee
83
Orange Syrup
Scotch Whisky
Spry Shortening
Tab Concentrate
Vegetable Oil
200
-30
Vinegar
Water
14
Acids
Acetic Acid (5%)
Acetic Acid Glacial
Bases
Ammonium Hydroxide (sat.)
Sodium Hydroxide (10%)
Salts
Sodium Carbonate (2%)
Calcium Silicate (10%)
Ethylene Glycol (50%)
Ethylene Glycol Mixture)
-1
-2
+2
Polyglycol ( Dow 80-6)
Polystyrene (expandable)
10
Sulfur Dioxide (dry gas)
Salt water (sea water)
Construction of the cable acc. to Nexans specifcations
Chemical properties:
Permissible continuous current carrying capacity: see PDF catalog
The semi-conductive tape used for the 6.6 and 13.8 kV cables will now be replaced by an extruded semi-conductive Silicone layer. Due to the Co-extrusion together with the Silicone insulation we have been able to eliminate air particles. The partial discharge values have improved dramatically as a result of this change (see table below).
Comparison of partial discharges between taped version (old) and extruded version (new).
1C = 1 As (Ampere-Second).
Nexans is able to manufacture special SIWO-KUL™ and SIWO-KUL-SIL cables to suit special applications.
Where built-in copper conductors are exposed to extreme high temperatures, we are able to supply silver plated copper conductors. The melting point of tin in comparison with silver is as follows:
Please send us your enquiry. We will quote tailor suited solutions.
Unlike installing medium voltage cables which are screened following to the norm, Siwo-Kul is a non-screened connection cable. To avoid problems with the corona effect, we recommend minimum installing distances between the cables Siwo-Kul and the earth.
The corona effect is the ionization of air around the conductor due to the electric field generated by high voltage. Below figures of the electric field, depending to the arrangement and shape of the earth.
To avoid the problem of electric field concentration, partial discharge and perhaps cable damages, we recommend installation of minimum distances "d" (mm) to the ground, whichever cross section:
Examples of spacer used in practice:
The indicated amperage values are based on the following assumptions : a) Several cables laid in parallel or bunched *). b) Conductor temperature = 180 °C. c) Without additional cooling. Suffcient natural air fow ensured. *) For details see DIN VDE 0298-4: 1998-11
These values of current are mentioned for a conductor temperature of 250°C (for all types 1.1 – 13.8 kV). Higher values can destroy the semi-conductive layer (types 6.6 und 13.8 kV). For different short-circuit values, the maximal current can be calculated by:
Cut: Siwo-Kul can be cut easily with adequate pliers:
Remove of the insulation: With a good knife, the braid have to be cut together with the silicone insulation and can be removed properly:
To avoid unproperly cutting and opening of the braid, we have 2 tips:
Finally, it's also possible to purchase Siwo-Kul-Sil where the braid is gluing on the silicone insulation.
The flexibility of Siwo-Kul creates inevitably a gap between the termination and the silicone insulation. This gap can be covered with a shrink sleeve, providing a perfect visual finish of termination. However, for voltages of 6.6 and 13.8 kV the phenomenon of electric field at this level is not resolved. This requires the recovery by a semi-conductive material.
The result of our experience leads us to propose two solutions with several benefits:
Cable shoe:
The collar fills the diameter difference between cable shoe and strands, which comes from using of oversized cable shoe for strands
Sleeve:
One size per cross section
Marking
Our SIWO-KUL™ cables have been printed: NEXANS SWITZERLAND SIWO–KUL +voltage in kV + section in mm² + Meter marks
