380kV XLPE Cable CU/XLPE/LEAD/HDPE 25005Q- Figure 1. 1 Type of Conductor 2 Core 3 Voltage Level 4 Conductor Material 5 Insulation material (full word data) 6 Grounding material 7 Voltage Level 8 Conductor size
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Q: (a) Find an expression for vo (t) fort > 0 in the circuit shown in Fig. 4 (a). 20 6 Ո 10 www www www…
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Q: 3. Find IB, IC, IE, VB and Vc if VBE is 0.7V. 3V Rc=20kQ RB=20kQ ẞ=100
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Q: Example:find an expression for Vc,ic, Vr for the circuit ? 40V 1=0 SKA 4BF
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- What size ungrounded conductors do we need for the 60 amp load? All conductors have typeTHHN insulation.Explain the L di/dt voltage problem in conductors undergoing commutation.The diameter of a cylindrical conductor A is 6 mm, and its length is 2 m. The diameter and length of a cylindrical conductor B of the same material as A arel3 mm and 1 m. The resistance of conductor B is 0.02 Determine resistance of conductor A, its temperature being the same as that of B.
- Describe what will happen to the current flow through a conductor given the following changes in properties: a) Increase in electrical resistivity -b) Decrease in electrical conductivity -c) Increase of temperature -d) Decrease in length -e) Thinning -A DC distributor cable is 1,000 m long and is loaded under: Distance from the feeding point “A” in meters. 250m 750m 1000m Load in amperes 100A 200A 300A The resistance of each conductor is 0.025 ohm/km.. Find the voltage at each load point if the voltage at the feeding point A is maintained at 250V.temperature rating that a conductor must have and still have 69 Ambient Tempere 4. The ampacity of 15 current-carrying 10 RHW aluminum conduc- tors in a raceway in an ambient temperature of 75'F is 1. gon factor for conductor ampacity in this location is (a) 12A (b) 15A (c) 22A (d) 30A 0.71 b0.82 0.88 0.96 5. Ain) uous load if the ambient temperature is 75°F and there are nine THHN conductor is required for a 19.70A noncontin- ne ambient temperature is 71"C, the minimum insulation current-carrying conductors in the raceway in a dry location. he capacity to carry current is (a) 14 (b) 12 (c) 10 A 60°C AI 90°C 105°C (d) 8 0 120°C 6. 6.11 Ampacity Adjustment [310.15(B)(3)(a)] The ampacity for each of nine current-carrying 10 THW conduc- tors installed in a 20 in. long raceway is 1 The ampacity of six current-carrying 4/0 XHHW aluminum con- ductors installed in a ground floor slab (wet location) is (a) 25A (b) 30A (c) 35A (d) 40A a) 135A 0) 144A (e) 185A 4 210A
- The property of insulating material which makes the breakdown voltage high in a cable is ...... Good Mechanical strength O High conductivity O High dielectric strength O High insulation resistanceA 2-wire d.c. ring distributor is 300 m long and is fed at 240 V at point A. At point B, 150 m from A, a load of 120 A is taken and at C, 100 m in the opposite direction, a load of 80 A is taken. If the resistance per 100 m of single conductor is 0.030. find: (i) current in each section of distributor (ii) voltage at points B and C.Consider a three-core, three-phase, 50 Hz, 11 kV cable whose conductors are denoted as R, Y and B in the figure. The inter-phase capacitance (C₁) between each pair of conductors is 0.2 µF and the capacitance between each line conductor and the sheath is 0.4 µF. The per-phase charging current is C₂ HE C₁ ,C₁ Outer Sheath
- Calculate element and welding currents with mesh analysis.A copper conductor is connected in parallel with twice its length of aluminum conductor. The resistivity of copper is (0.0159 µ0. m) and that of aluminum is (0.0254 µ0. m). If the diameter of the aluminum is (10 mm). Determine the necessary diameter of the copper conductor in order that each conductor will carry the same current.Q3: Two circuits are arrange as shown in figure (1), (a and b) each one of them has two identical conductors , the vertical distance between each conductor in the same circuit is 1 m, the distance horizontlly between circuits is 30 cm, take 1 cm as diamter for each conductors. Derermine the inductance per km of the double circuit ? a a' b' FIGURE (1)