5. A string of 4 insulators has self-capacitance equal to 4 times the pin-to-earth capacitance. Calculate (1) the voltage distribution across various units as a percentage of total voltage across the string and ( string efficiency.
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- 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.Electrical Engineering An insulator has 3 units. The capacitance between each insulator pin and earth is 15% of self capacitance of each unit. Find: a. Voltage across each insulator unit in percentage. b. String efficiency.Q3) The self capacitance of each unit in a string of four suspension insulators is C. The shunting capacitance of the connecting metal work of each insulator to earth is 0-2 C. Calculate (i) the voltage across each insulator and (ii) string efficiency.
- Question A suspension type insulator has three units with self-capacitance C and ground capacitance 0.1C. What will be the string efficiency?7. Each of three insulators forming a string has self-capacitance of “C" farad. The shunt capacitance of each o h cap of insulator 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. [ 31-7%, 29-4%, 38-9%; 85-7%]A string of three insulators has a self capacitance of 10 times its pin-to-earth capacitance. Then (1) find the voltage distribution across each unit as a percentage of the total voltage of the string and (2) find the string efficiency.
- A string of 8 suspension insulators is to be fitted with a grading ring. If the pin to earth capacitances are all equal to C, find the values of line to pin capacitances that would give a uniform voltage distribution over the string.Which of the following is not true for ferromagnetic materials? Please choose one: a. High?mthey have value. b.Above the Curie temperature, they lose their non-linear properties. C. a fixedµrthey have value. D.The energy loss is proportional to the area of the hysteresis loop.In a 36KV overhead line, there are 3 units in the string of insulators. If the capacitance between each insulator to pin and earth is 55% of self-capacitance of each insulator. Find the distribution of voltage over three insulators and string efficiency.
- 8. Each of the three insulators forming a string has a self capacitance of C farad The shunt capacitance of each insulator is 02C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: )with the guard ring. (7) without guard ring. 10 95% () 86 13%|We want to investigate how the field strength will be with air as dielectric and with steatite. A plate capacitor is placed in a 24 kV network between phase and ground. The relative permittivity of air is &=1 and for steatite &-6. The plate capacitor has area = 1m². The distance between the electrodes is 2 mm. Ep = 8.854-10-12 F/m A=1m² d=2mm a) Calculate the maximum field strength in the plate capacitor. (Answer: 9.8kV/mm) b) What is the capacitance of the capacitor if we use steatite? (Answer: C = 26.6nF)Compare alternative and direct currents by comparing their physical properties. (Explain alternans, cycles, periods, frequency terms during this comparison. Also in this comparison, explain the electron flow directions separately in alternating and direct current)