Power Cable
Technical and operational characteristics of the power cable VVGng designed to operate in a stationary state at ambient temperatures from -50 C to +50 C, relative humidity up to 98% (at 35 C). In operating mode, the maximum allowable temperature for a long time of heating cable cores to + 70 C, and in emergency mode or overload, its value can be up to + 80 C (heating duration is not more than 8 hours per day and 1000 hours for the entire period of service). Short-circuit (up to 4 seconds), the maximum allowable heating temperature lived (up to 4 sec) – + 160 C. Cables VVGng for 10 min. stand the test of alternating voltage 3 kV and 3,5 kV cable with an operating voltage of 660 V and 1000 V respectively.
The insulation resistance was living at 20 C under section up to 1,5 mm2 is 12 mw / km, under a section ,5-4, 0 mm 2 – 10 mw / km, cross section 6.0 mm2 – 9 mw / km, cross section 10-240 mm 2 – 7 Mohm / km. Insulation resistance with long-lived permissible heating temperature is not less than – 0,005 mw / km. Maximum working voltage mains cable 0.66 kV – 0.72 kV for cables 1 kV – 1,2 kV. Laying and installation of cables VVGng without preheating at a temperature not lower than -15 C. The minimum bend radius when installing single-core cables – 1910 Dn, multicore – 7,5 Dn (Dn – outer cable diameter). Building length of cables for the main sections of veins: 2,5 – 16 mm 2 – 450 m, 25 – 70 mm 2 – 300 m, 95 mm2 and above – 200 m.Garantiyny life VVGng cable – 5 years, lifetime – 30 years. Scope of the Power Cable VVGng with nominal voltage of 0.66 kV and 1 kV applied in dry and wet production areas, in special cable racks, in boxes, as well as outdoors without risk of mechanical damage during operation. For laying in soil (trenches), this kind of cable is not recommended, but it has been used successfully in places subject .Kabeli VVGng designed for vertical, inclined and horizontal lines.