Advanced Ultra Power Transmission Consultancy Interview Questions and Answers

Q1. What types of relay used to protect transformers, feeders and transmission line? what is corona, SIL, and ferrenti effect? what is the parallel operation of transformer? and what is KVA fault in transforme...read more
Ans. 
Various relays protect transformers and lines; corona, SIL, and Ferranti effects are key concepts in electrical engineering.
• Types of Relays: Differential relays protect transformers, while distance relays are used for feeders and transmission lines.

• Corona: A phenomenon where ionization of air occurs around conductors, leading to energy loss and audible noise, especially at high voltages.

• SIL (Switching Impulse Level): R...read more
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Q2. 3 phase machine (alternator)
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Q1. Power System protection
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Q2. Substation equipment
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You have to give a test containing 10 basic question of the engineering field

Q1. What are the relevent indian standard codes
Ans. 
Some relevant Indian standard codes for design engineers are IS 456, IS 3370, IS 800, IS 875, IS 1893.
• IS 456 - Code of practice for plain and reinforced concrete

• IS 3370 - Code of practice for concrete structures for storage of liquids

• IS 800 - Code of practice for general construction in steel

• IS 875 - Code of practice for design loads (other than earthquake) for buildings and structures

• IS 1893 - Criteria for earthquake ...read more
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Q2. How to draw SF And BM diagram
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To draw SF and BM diagram, determine the support reactions, cut the beam at a section, and analyze the forces and moments.
• Determine the support reactions at the ends of the beam

• Cut the beam at a section where you want to draw the diagram

• Analyze the forces (Shear Force) and moments (Bending Moment) acting on the section

• Plot the Shear Force and Bending Moment diagrams based on the calculated values
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Q1. What is SIL?
Ans. 
SIL stands for Safety Integrity Level, a measure of safety system performance in terms of probability of failure on demand.
• SIL is part of the IEC 61508 standard for functional safety.

• It categorizes safety systems into four levels: SIL 1 to SIL 4, with SIL 4 being the highest.

• SIL levels are determined based on the risk reduction required for a specific application.

• For example, a SIL 2 system might be used in a chemical ...read more
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Q2. What is the purpose of using relays for transformer protection?
Ans. 
Relays protect transformers by detecting faults and isolating them to prevent damage and ensure system reliability.
• Relays monitor electrical parameters like current and voltage to detect abnormalities.

• In case of overload, relays can trip circuit breakers to disconnect the transformer.

• Differential relays compare input and output currents to identify internal faults.

• Overcurrent relays protect against excessive current th...read more
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