What is Corona? How is corona organized? What are the factors influencing corona? What is the effect of corona?
What is Corona? Ans: When the spacing of two conductors is kept greater than the diameter, they are gradually increased by applying AC voltage across them. Then at a certain stage the air on the four sides of the conductor is ionized and the insulation trace of the air is broken. In this condition, light dull violet rays appear in and around the conductor, hissing sound and the formation of weight gas is called corona.
How is corona organized? is done Answer: When ac supply is applied across two conductors i.e. ac supply is gradually increased, there comes a stage when the air around the conductor gets ionized and the insulation strength of the air breaks. The result is a hissing sound around the conductor and a purple glow discharge is seen. This results in the formation of weight gases.
Ways to reduce the corona effect. Answer: Corona effect can be reduced in the following ways a) By increasing the size of the conductor. Increases Conductor Spacing.
What are the factors affecting Corona? What is corona power loss? Ans: Factors affecting Corona are: Ans: Causes of Corona 1. Weather m is called corona power loss. This is P2. Conductor size 3. Distance between Conductor +25 P= -242.2 (B Line Voltage.
What is the effect of corona? f = Supply frequency (HE) V = J to neutron voltag V = Critical Disruptive (r.m.s) per phase Answer: Coronar Effects: 1. Violet rays appear on all four sides of the conductor. 2. Corona produces a hissing sound. 3. Creates ozone gas. 4. Corona causes power loss. 5. Corona harmonics create current
What is the skin effect? Uttara Skin Effect AC current flows through any conductor. For religion that tries to flow over the surface without entering the conductor when it occurs is called the three effects.
On temperature: Solid conductor strandard conductor skin effect is less. If the supply frequency is less than 50Hz and the diameter of the conductor is small (<1cm), the skin effect is not considered.
What are the ways to reduce the skin effect? Answer: 1. Reducing the radius of the conductor. . Uses non magnetic materials. 3. Using Stranded Conductor. Using Aluminum Conductor. 5. Using hollow cylinder shaped Conductor.
Proximity effect depends on the subject. Answer: Proximity effect depends on the following factors: 1. Conductor material. 2. On the diameter of the conductor. 2. On Frequency. 4. On permeability. 5. On type of structure or size of conductor.
In what ways can the proximity effect be reduced? Answer: 1. By increasing the spacing of the conductor. 2. Using Stranded Conductor. 3. Keeping the frequency range low. 4. Mechanical design of over head line’s.
What are the main parts of the overhead line? Answer : The main parts in over head line are: 1. Conductor 2. Support 3. Cross arm 4. Insulator. 5. Guy and stay 6. Lighting Arrestor 7. Fuse and isolating switching 8. Guard wire 9. Bird Guard 10. Danger plate 11. Anti-climbing wire etc.
What are the properties of conductor material?Answer: The qualities are: 1) High electrical conductivity. 2) High tensile strength. 3) Price is low. 4) Low relative gravity. 5) Shall not be brittle. 6) Wire must be moisture and rust proof.
What are the conductors used in over head lines? Answer: Conductors are: 1. Copper conductor. 2. Aluminum Conductor. 3. Steel cored aluminum. 4. Galvanized steel. 5. Cadmium copper. 15. What are the characteristics of copper conductor? Answer: The characteristics of copper conductor are: 1. High electrical conductivity. 2. High tensile strength. 3. Relative importance is high. 4. The price is high. 5. Its lifespan is very long.
What are the characteristics of aluminum conductors?Answer: The characteristics of aluminum conductors are: 1. Electrical conductivity is lower than that of copper. 2. Low tensile strength. 3. Low specific gravity. 4. The price is low. 5. Aluminum is 33 percent heavier than copper wire of the same volume.
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