C₁1 T. 12 P i2 с It C₁||!1 Q V2 In a string of two unit suspension insulators, if the insulator voltages are 60% and 40% of the line voltage respectively, find the ratio of the insulator's own capacitance to the earth capacitance.
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- 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)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 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.
- 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%]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.
- In a 33kV overhead line, there are three units in a string of insulators. If the capacitance between each Insulator pin and earth is 11% of self capacitance of each Insulator, find a) distribution of voltage over 3 Insulators i) string insulators.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.1.1 Given the circuit in Figure 1, using Kirchoffs voliage law show that: jwME, Ez R1 + jwl1 R, R Figure 1 1.2 A ferromagnetic ring of cross-sectional area 800 mm and of mean radius 170 mm has two windings connected in series, one of 500 turns and one of 700 turns. If the relative permeability is 1200, calcula:e the self-inductance of each coil and the mutual inductance of each assuming that there is no flux leakage.
- 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.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%|A triac can pass a portion of …………… half-cycle through the load a. neither positive nor negative b. both positive and negative c. only negative d. only positive