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- The symmetrical short circuit current is ______________________ quantity in nature. a-Exponential b-Ramp c-Alternating d-DirectOver 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.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.
- Discuss the desirable properties of insulators. Explain the causes of insulator failure due to electrical breakdown. Each line of a three-phase system is suspended by a string of three identical insulators of self-capacitance C farad. The shunt capacitance of connecting metal work of each insulator to earth is 20.7 % of C while for line it is 13.8 % of C. Calculate the string efficiency of the system if a guard ring increases the capacitance to the line of metal work of the lowest insulator to 0.25 C.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)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 m
- An overhead line has span of 260m. The tension in the line is 1200kg while the conductor weighs 650 kg per 100 meters. Calculate the maximum SAG in the conductor. If the height of the tower is 13 meters, estimate the clearance of conductor to the ground. Draw a figure and mark values of sag, clearance, span, height of conductor etc.A three phase, 33 KV, underground cable system, consider a single core of conductor radius 0.8 cm diameter and lead sheath of 2.3 cm. The core and lead sheath have been separated by two intersheaths with radius 1.3 cm and 1.8 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. Please i need it know pleaseThe 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/mm2
- Prove this formulas by using re equvialent model.Q4: Each conductor of a 3-phase high-voltage transmission line is suspended by a string of 4 suspension type disc insulators. If the potential difference across the second unit from top is 13-2 kV and across the third from top is 18 kV, determine the voltage between conductors. Suppose Xc 19.What is the different b/w solid type cables and pressure cables (oil and gas)... The course is power transmission system and the topic is under ground cables...