2a d 2b 20 Find the capacitance per meter of a single-phase transmission line. Assume d>>a and d>>b. 2περ C = d In+In b
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- Each line of a 3-phase system given in figure is suspended by a string of 5 identical disks and the ratio of C1/C=0.1 (Shunt capacitance per self-capacitance) is given. If the string is connected to line of voltage 33kV. a) What is the voltage distribution over the unit of string and what is the string efficiency? b) When the string is supplied by a Guard Ring and this lead to add a two air capacitance of value 0.2C, 0.1C respectively to the nearest to the conductor. Find the new voltage distribution and the new efficiency.Consider a 3-phase, 50 HZ, 11 KV distribution system. Each of conductors is suspended by an insulator string having two identical porcelain insulators. The self-capacitance of the insulator is 5 times the shunt capacitance between link and ground. Find the voltages across two insulators.The mutual inductance coupling coefficient standard unit is .. * Ohm Henery O Unit-less Mho
- 2.5 A 3-phase single circuit bundled conductor line with two sub-conductors per phase has horizontal spacing with 6.1 m between the centre lines of adjacent phases. The distance between the sub- conductors of each phase is 30.5 cm and each sub-conductor has a diameter of 2.54 cm. Find the inductance per phase per km. [0.988 mH]Three Conductors of a 3-phase line are arranged at the corners of a triangle of sides A=2 m, B=3 m, and C=4 m. The diameter of each line conductor is 1.35 cm. a) Calculate the Capacitance per phase per km (C1) in nanofarad for this arrangement. b) Calculate capacitance per phase per km(C2) in nanofarad if the conductor if the spacing is doubled. c) Calculate the Ratio of C2 with respect to C1.Three Conductors of a 3-phase line are arranged at the corners of a triangle of sides A=2 m, B=2 m, and C=4 m. The diameter of each line conductor is 1.45 cm. a) Calculate the Capacitance per phase per km (C1) in nanofarad for this arrangement. b) Calculate capacitance per phase per km(C2) in nanofarad if the conductor if the spacing is doubled. c) Calculate the Ratio of C2 with respect to С1. a) b) c)
- Over string of three phase transmission line has a four insulators and Ce=D0.12 C. If the voltage between the steal pin of the first insulator and the metal cap of the third insulator is 33 kv. 1- Find the voltage distribution over the insulator. What will be the string efficiency 2- If the sting is supplied by a guard ring and this lead to add one air capacitance of value 0.2 C. What will be the new distribution over the insulators and what will be the new string efficiency.Over string of three phase transmission line has a four insulators and Ce=D0.12 C. If the voltage between the steal pin of the first insulator and the metal cap of the third insulator is 33 kv. 1- Find the voltage distribution over the insulator. What will be the string efficiency 2- Ifthe sting is supplied by a guard ring and this lead to add one air capacitance of value 0.2 C. What will be the new distribution over the insulators and what will be the new string efficiency.A 120V adjustable frequency ac source is connected in series with a resistor, an inductor, and a capacitor. At 60Hz, the resistance is 5 ohms, the inductive reactance is 3 ohms, and the capacitive reactance is 4 ohms. Compute: (a)load impedance at 60Hz (b) value of the capacitance and inductance Explain each step.
- A- A 3-ph, double circuit O.H.T.L, 320 kV, 340 km, 50 Hz has a configuration as shown in the figure below where each phase in the double circuit has a double bundle with a spacing of d cm between the two conductors in the bundle where d is the last two digits (from right) of your registration number (i.e for the student that has a registration mumber 202112396, d= 96). Each conductor in the bundle has a diameter of 0.135 ft and a geometric mean radius (Ds = 1.6 cm). Calculate: 1- Inductance per phase per km. 2- Total inductive reactance. 3- This T.L. is required to supply 240 MVA at 0.86 lag P.f. at 320 kV, assuming that this load is divided equally between these two circuits, find the voltage drop across this T.L (ignore capacitive effect in the calculation). 4- What may happen if we replace the location of a' and c' bundles. Discuss your answer. 5- Suggest a way to ređuce the value of the inductance. Verify your suggestion. -8 m 3m 3m 8 m 11 m3-phase double circuit line has its conductors at the vertices of a regular hexagon with side3.5 m. The diameter of each conductor is 2 cm. Find the inductance per phase per km.[0.596 mh]Q2: A single-phase transmission line consisting of two conductors, the radius of each conductor is 0.4 cm, the distance between the conductors is three and half meters and the height above ground is eight meter. The capacitance in µF/km without effect -1 of ground is إجابتك The capacitance in µF/km with effect of -2 ground is