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Method of reducing Corona

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March 17, 2021

Solution:

1.By increasing conductor size.

2. By increasing conductor spacing.

3.By using hollow and bundled conductor

4.By reducing current density in a conductor

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Comments

A perUnit value of 4ohm.Resistor at 100MVA base 10KV base voltage is?

March 18, 2021

Given data: R= 4ohm MVA = 100 KV = 10 Solution: Find the base impedance Zb = (10)^2 / 100 = 1 = 4/1 = 4ohm

Disadvantages of corona

March 17, 2021

Solution: It reduce the transmission line efficiency It cause inductive interference with communication lines More loss of energy Ozone produce corrosion of the conductor Non-sinusoidal voltage drop occurs It attenuates lightning surges

Protective Relay

March 16, 2021

Solution: The device detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the power system. Types: 1. Directional relay i.Induction type over current relay ii.Induction type reverse power relay 2. Differential relay 3. Distance relay (Based on transmission line distance) i.Impedance relay ii.Reactance relay iii.Admittance relay