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- Q4. A Transmission Line has a span of 250 meters between two level supports. The conductor has a cross-sectional area of 1.29 cm2, weighs 1170 kg/km and has a breaking stress of 4218 kg/cm2. Calculate the sag for a safety factor of (5), allowing a wind pressure of 122 kg per square meter of projected area. What is the vertical sag?A round underwater transmission cable consists of a core ofcopper wires surrounded by nonconducting insulation. If x denotesthe ratio of the radius of the core to the thickness of theinsulation, it is known that the speed of the transmission signalis given by the equation y = x2 ln (1/x). If the radius of the coreis 1 cm, what insulation thickness h will allow the greatest transmissionspeed?A transmission line has a span of 250 meters between the line supports. The conductors has a cross sectional area of 1.29 cm2 and weighs 1170 kg/km and has a breaking stress of 4218 kg/cm2. Calculate the sag and vertical sag with a safety factor of 5, with a wind pressure of 122 kg per square meter of the projected area.
- Electrical transmission towers are stationed at 350 m intervals and a conducting cable 2cm in diameter is strung between them. How many wires should each tower carry toensure structural integrity during a tropical storm? The towers are designed to withstandup to 180 kN of transverse force and during a cyclone, wind can blow up to 200 km/h.Assume there is no interference between the wires and take air density as 1.2 kg/m3and viscosity as 1.7×10-5 Nsm-2 . If the smooth insulation on the wires is mechanicallyroughened up before application what effect it will have on the design? Also, establishwhether the wires are likely to be subjected to self-induced vibrations and if so what the frequency would be. The frequency of such forced vibration, sometimes called self-induced vibration, may be calculated from an empirical formula due to Vincent Strouhal: fd⁄Uo = 0.198(1 − 19.7⁄Re) 250 < Re < 105A transmission line is supported from two towers at heights of 40 m and 58 m above ground level, the horizontal distance between the towers being 300 m. If the maximum allowable tension is 2500 kg, find the minimum clearance and the clearance at a point mid-way between the towers. Weight of conductor is 1 kg/m.The diameter of the overhead lines in the form of cylindrical conductors in a 300 kV three-phase transmission system is 20 mm. a) - How much distance should there be between two conductors using the maximum area calculation equations? Calculate. (Puncture peak strength of air is 30kV / cm.) b) - In this configuration, if the distance between phase conductors is 0 m, will discharge calculation? c) - Maximum electric field in the same configuration, for electrode distances to be A m Calculate the value. (When heard in calculations Ꜫ0 = 8.854x10-12 F / m)
- Assume that the system recorded by the block diagram is reliable. a) Determine the position constant, kp, of velocity, kv, and of acceleration, ka, of the system. b) Determine the steady-state errors for a magnitude 5 input in step, ramp, and parabola, respectively.TOPIC: Transmission Lines, Power Systems, and Powerplants:INSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:The per-phase constants of a 345-kV, three-phase, 150-km-long transmission line are resistance = 0.112/km, inductance-1.1 mH/km, and capacitance = 0.02 uF/km. The line supplies a 180-MW load at 0.9 power factor lagging. Using the nominal-m circuit, determine the sending-end voltage in kV. 351.2 349.3 348.7 350.8A 110 kV, 50 Hz, 175 km long three-phase transmission line consists of three 1.2 cm diameter stranded copper conductors spaced in a 2 m delta arrangement. Assume that temperature is 25°C and barometric pressure, 74 cm. Assume surface irregularity factor n = 0.85 (roughness factor), mV for local corona = 0.72 and mV for geneal corona = 0.82 Find: (a) disruptive critical voltage, (b) visual corona voltage for loca corona,
- A transmission line has a span of 250 m between supports, the supports being at the same level. The conductor has a cross-sectional area of 1·29 cm2. The ultimate strength is 4220 kg/??2 and factor of safety is 2. The wind pressure is 40 kg/??2. Calculate the height of the conductor above ground level at which it should be supported if a minimum clearance of 7m is to be kept between the ground and the conductoDetermine the range of k using the bilinear transformation method, for which the system remains stable, from the calculated range, evaluate a stable and an unstable value of 'k' and verify its stabilityA 84 meter long conductor with a unit weight of q=(0.8) kg/m is separated from each other.It is stretched on two poles in a straight span at a horizontal distance of "a" and the deflection valuef=16 meters measured. Accordingly, with the catenary method: a. Calculate the value of "a" b. Horizontal 18 meters from the lowest point of the conductor to any pole Calculate the deflection value at distance. c. Calculate the resultant tension force (S) at the peaks. D. At the apex, this is the angle that the direction of the S force makes with the horizontal axis calculate.