erives and analyse relation of capacitance for 3-core cables ? proper explanation in details
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- 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 MhoThe number of disc insulators used in a suspension insulator setup with string efficiency 80 %, phase voltage 33 kV, and the voltage across insulator nearest to conductor 11 kV is .......................... Complete the answer.
- The number of disc insulators used in a suspension insulator setup with string efficiency 85 %, phase voltage 66 kV, and the voltage across insulator nearest to conductor 9 kV is .. ...:Two circuits are arrange as shown in figure (1), (a and b) each one of them has two identical conductors, the vertical distance between each conductor in the same circuit is 1 m, the distance horizontlly between circuits is 30 cm, take 1 cm as diamter for each conductors. Derermine the inductance per km of the double circuit ? a a' b' FIGURE (1) --150 kv single core cable has a radius of cable of 5cm. The insulation martial has two layers. The relative permittivity of the first and second layers are 6 and 3 respectively. If the minimum electric stress of the first and second layers are 30 kv/cm and 20 kv/cm respectively. Find the maximum electric stress of the first layer s are
- Derive and analyse relation of capacitance for 3 core cables.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.7. Each of three insulators forming a string has self-capacitance of "C farad. The shunt capacitance of each cap of msulator is 0 25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.
- In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 15kV and that across the next unit is 12kV. Estimate: ratio of mutual to self-capacitance i. the bus-bar voltage of the substation. Efficiency across the string of insulators ii. iii.In an overhead line, there are three units in the string of insulators having line voltage of 33kV. If the shunt capacitance between each insulator pin and earth is 0.11 times than self-capacitance of each insulator, (i) Calculate the distribution of voltage over 3 insulators. (ii) Explain to how to make uniform voltagesQuestion A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?