characteristic impedance
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- Q4(a) The differences between TWO unequal towers 60 m support a transmission line conductor at road crossing. The given span length is 499.5 m as show in Figure Q4(a). If the tension in the conductor is 1700 kg, determine the minimum clearance of the conductor and road and clearance mid-way between the supports. Weight of conductor is 1-5 kg/m. Bases of the towers can be considered to be at road level. Given height of the tower A is 35 m from the ground level. Span Length= 499.5 ROAD Figure Q4(a)5. A coaxial cable, having an inner diameter of 0.025mm and using an insulator with dielectric constant of 2.56, is to have a characteristic impedance of 2000 2. What must be the outer conductor diameter?A three phase, 11 KV, underground cable system, consider a single core of conductor radius 0.5 cm diameter and lead sheath of 1.25 cm. The core and lead sheath have been separated by two intersheaths with radius 0.75 cm and 1 cm. Draw the cable core, dielectric and intersheath layers showing the thickness of each layer, then determine the voltages on the both intersheaths. Suppose the maximum stress on the layers are the same.
- A single core lead covered cable is to be designed for 68 kV(peak value) toearth. Its conductor diameter is 2 cm and its three insulating materials havepermittivities of 5, 4 and 3 respectively with the corresponding maximumsafe working stress of 38 kV/cm (r.m.s), 26 kV/cm (r.m.s) and 20 kV/cm(r.m.s) respectively. Find the minimum diameter of lead sheath.Assume that a single-conductor belted cable has a conductor diameterof 0.681 in., inside diameter of sheath of 1.7025 in., and a length of8000 ft. The cable is to be operated at 12.47 kV. The dielectricconstant is 4.5, and the power factor of the dielectric at a ratedfrequency and temperature is 0.05. Calculate the following:(a) Capacitance of cable.(b) Charging current.(c) Dielectric loss of cable.(d) Equivalent resistance of insulation.The conductor shown in the figure below is composed of five strands. The diameter of each strand is 2.5 mm. Find the GMR (Geometric mean radius) of the conductor.
- The differences between TWO unequal towers 70m support a transmission line conductor at road crossing. The given span length is 499.5 m as show in Figure Q4 (a). If the tension in the conductor is 1600 kg, find the minimum clearance of the conductor and water and clearance mid-way between the supports. Weight of conductor is 1-7 kg/m. Bases of the towers can be considered to be at road level. Given height of the tower A is 35 m from the ground level. Span Length= 499.5 ROAD Figure Q4(a)Q2. A 3-phase, 132 KV, 50 Hz, 100 Km, single circuit bundle conductor transmission line as shown in the figure below. If the diameter of each strand is1 cm, and the conductors are regularly transposed. Determine, the capacitance to neutral per phase per Km . 6 m 5 m 0.18 ma) Explain the demerits of non-uniform potential gradient of insulated cable. b) 'Insulation resistance varies proportionally with the value of insulation thickness - justify this statement with appropriate equations. c) A single core cable to be used on a 50kV single phase system. Maximum permissible dielectric is not to exceed 35kV/cm (peak). I. Determine the most economic conductor and cable diameter. II. Estimate voltages on the inter sheaths, if two inter sheaths are introduced to increase 32% of the existing working voltage of the cable using the method of 'inter sheath grading
- A-Define the sag of T.L and derive an expression for the total length of a Conductor and the tension at the points of support in terms of span length. horizontal tension and weight of conductors.The cost of a single phase overhead feeder is OMR 7 a per km ( a is area of cross section in sq mm) and the interest and depreciation charges on feeder are 10%. Determine the most economical current density to use for distribution requiring full load current of 75% of the year. The cost of generating electrical energy is 12 baisa per unit. Assume resistance of 1 m length and 1 mm2 section of conductor as 1/62 ohm. Current density A/mm2Determine the inductance per unit length of a coaxial cable with an inner radius a andouter radius b