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Dorf Ketal Chemicals Interview Questions and Answers

Updated 28 Jan 2025

Q1. What should be considered when erecting an IDT (Inverter duty Transformer)?

Ans.

Considerations when erecting an IDT (Inverter duty Transformer)

  • Ensure the transformer is designed for inverter duty applications

  • Properly size the transformer based on the inverter's output power

  • Consider the harmonic content of the inverter's output when selecting the transformer

  • Provide adequate ventilation and cooling for the transformer to handle the increased heat generated by the inverter

  • Ensure proper grounding and protection against overvoltage and overcurrent conditions

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Q2. What types of conductors are used in high-tension (HT) lines, and what are their current capacities?

Ans.

High-tension (HT) lines use different types of conductors with varying current capacities.

  • Types of conductors used in HT lines include aluminum, steel, and composite materials

  • Aluminum conductors are commonly used due to their lightweight and high conductivity

  • Steel conductors are used for their strength and durability

  • Composite conductors are a newer technology that offer a balance of strength and conductivity

  • Current capacities of conductors vary depending on their material, si...read more

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Q3. What is the distance between poles in 33KV high tension lines?

Ans.

The distance between poles in 33KV high tension lines is typically around 50-60 meters.

  • The distance between poles in high tension lines is determined by factors such as terrain, voltage level, and local regulations.

  • In general, the distance can range from 50 to 60 meters for 33KV high tension lines.

  • This distance is important to ensure proper support and insulation of the conductors between poles.

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Q4. Why is tan delta testing conducted in power transformers?

Ans.

Tan delta testing is conducted in power transformers to assess the insulation condition and detect any potential faults.

  • Tan delta testing helps in evaluating the insulation quality of power transformers.

  • It can detect any potential issues such as moisture, contamination, or aging of insulation materials.

  • By measuring the tan delta value, engineers can assess the dielectric losses in the transformer.

  • Regular tan delta testing can help in predicting and preventing transformer fail...read more

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Q5. What is the star-delta connection in power transformers?

Ans.

Star-delta connection is a method used in power transformers to reduce starting current and improve efficiency.

  • Star-delta connection involves connecting the primary windings of the transformer in a star configuration during starting, and then switching to a delta configuration during normal operation.

  • This method helps in reducing the starting current drawn by the transformer, which is beneficial for the power system.

  • It also helps in improving the efficiency of the transformer...read more

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Q6. What is the process for attaching modules?

Ans.

The process for attaching modules involves identifying connection points, aligning the modules, securing them in place, and testing for functionality.

  • Identify connection points on both modules

  • Align the modules properly to ensure a secure fit

  • Secure the modules in place using appropriate fasteners or connectors

  • Test the functionality of the attached modules to ensure proper connection

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Q7. What is the process of laying LT cables?

Ans.

The process of laying LT cables involves planning, trenching, laying the cables, jointing, testing, and backfilling.

  • Plan the route and depth of the trench for laying the cables.

  • Excavate the trench to the required depth and width.

  • Lay the cables in the trench, ensuring proper alignment and support.

  • Joint the cables together using appropriate connectors.

  • Test the cables for continuity and insulation resistance.

  • Backfill the trench and restore the surface to its original condition.

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Q8. What is a vector group?

Ans.

A vector group is a method used to represent the phase relationship between the primary and secondary windings of a transformer.

  • Vector group indicates the connection of transformer windings and the phase shift between them.

  • It is represented by a combination of letters and numbers, such as Yd1, Dyn11, etc.

  • Different vector groups have different phase relationships, affecting the transformer's performance and operation.

  • Vector group testing is important during transformer commiss...read more

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