D: A 3 phas e, 50 HZ Transmission line (100km) Long delivers 50 MUA, o.8pf Lagging and 110kv the resistance of line is (o-25 Rl km), 1-5 cm diameter, spaced equilaterally 2m between centres - Wse nominal a methog and a ll needed Constants to Determine the voltaye Regucation and efficiency?
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- 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 single core cable for use on 11 kV, 50 Hz system has conductor area of 0.645 cm² and internal diameter of sheath is 2-18 cm. The permittivity of the dielectric used in the cable is 3.5. Find (i) the maximum electrostatic stress in the cable (ii) minimum electrostatic stress in the cable (iii) capacitance of the cable per km length (iv) charging current.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.
- 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 mQuest- A single phase 50 Hz, system supplies an inductive load of 5000 kw at power factor 0.8 lag through a line 25 km. Resistance of the line is 0.0195 2/km and inductance = 0.36 mH/km, receiving end voltage is 10 kV. A capacitor is connected across the load to get the voltage regulation of 10%. Ratio of transmission line loss with and without shunt capacitor isThe VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedance
- 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.Over sting of 3- phase tran smission line has 4 insulators and Ce=0.15C. If the voltage between the steel pin of the first insulator and the conductor is 25 kV. Find 1- The voltage distribution over the sting and what will be the string efficiency. 2- If the string issslisd by a cuardsing and this lead t de air capacitance of Lize ind the new voltave distribution and the efficienleyFor a 500-W carrier modulated toa depth of 80%, find the total power and %P.S. in each of the following forms of AM. a. J3E b. H3E C. DSB
- 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 isQ1) Find the string efficiency of each line of a 3-phase is hung by a 3 strings of insulators. Each insulator has (C) Farads. The shunt capacitance of metal is 0.5 C to earth and of 0.2 C to the line, and the line a guard ring increases the capacitance to the line of the lowest insulator to 0.6 C.What is the maximum length in km for a 1-phase transmission line having copper conductor of 0.775 cm² cross-section over which 200 kW at unity power factor and at 3300V are to be delivered? The efficiecny of transmission is 90%. Take specific resistance as 1.725 µ cm.