The value of insulation thickness in cm, if conductor diameter is 2cm, provided i) Maximum stress in the Dielectric of a single core cable = 40 kV/cm (RMS) ii) Minimum stress in the dielectric of a single core cable = 10 kV/cm (RMS) will be
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- A 30 kV single core cable has a conductor dimeter of 2 cm and a sheath of inside diameter 6 cm. Find the maximum (peak value) and minimum stress (peak value) in the insulation.Single core cable design for 25 kV. The radius of conductor is 0.5 cm. The insulation material consists of two layers. The thickness of each layer is 2 cm. The voltage of first and second layers are 20 kV, 5 kV respectively. The maximum Electric stress of the cable isIn a string of suspension insulator with three units, the line unit has 20kV and k=0.35. The voltage across tower unit is........ and across middle unit is.......
- 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.please solve for nodal stress method. (if it is possible to apply supernodes)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.
- 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.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 pleaseIn 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: i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulators
- 3. What are the classifications of Core Loss and Copper Loss?A single core lead covered cable is to be designed for 68 kV(peak value) toearth. Its conductor diameter is 2 cm and its three insulating materials havepermittivities of 5, 4 and 3 respectively with the corresponding maximumsafe working stress of 38 kV/cm (r.m.s), 26 kV/cm (r.m.s) and 20 kV/cm(r.m.s) respectively. Find the minimum diameter of lead sheath.Schering Bridge is used to find ____________. a. capacitance b. pressure c. inductance d. frequency