5. Calculate the CT ratio on the 22kV side.

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A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of the protective transformers on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

A three-phase transformer having a line voltage ratio of 0.4 kV/11kV is connected Star/Delta and protective transformers on the 0.4 kV side have a current ratio of 500/5. Calculate the ratio of ... on the 11 kV side. Draw a neat circuit diagram and indicate the given values at appropriate places.

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A plant consists of two 10 MVA generators of reactance 18% each and two 5 MVA generators of 12% each. All are connected to bus bar to supply a load through three step up transformers of 8 MVA each having reactance of 8%. Determine fault MVA on HV side of any one transformer.

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Explain Star and Delta connected three-phase balanced circuits.

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What is the relation between line and phase values in a star and delta connected system?

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What is the relation between power in 3 phase delta and star connected system?

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Why is the transformer connected in delta Star?

Why is the transformer connected in delta Star?
Answer : A transformer is connected in a **delta-star (Δ-Y)** configuration for several practical reasons in electrical systems. Here's why it's commonly used: ### 1. **Step-down Voltage* ... single-phase connections. It offers benefits like voltage stability, load balancing, and better handling of faults....

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A 500kVA distribution transformer having copper and iron losses of 5kW and 3kW respectively on full load. The transformer is loaded as shown below: Loading (kW) Power Factor (Lag) No. of hours 400 0.8 06 300 0.75 12 100 0.8 03 No load - 03 Calculate the all-day efficiency.
Answer : To calculate the all-day efficiency of the transformer, we need to consider the total energy output, the total energy input, and the losses over a 24-hour period. The transformer experiences two types of ... \] ### Final Answer: The all-day efficiency of the transformer is approximately **98.39%**....

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State the relationship between line voltage & phase voltage and line current & phase current in a 3-phase star connected system.

State the relationship between line voltage & phase voltage and line current & phase current in a 3-phase star connected system.
Answer : In a 3-phase star (wye) connected system, the relationship between line voltage, phase voltage, line current, and phase current can be summarized as follows: ### 1. **Line Voltage and ... and currents behave in a 3-phase system, especially when configuring systems for different types of loads....

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State the relationship between line voltage & phase voltage and line current & phase current in a 3-phase delta connected system.

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Draw neat diagram of star-delta starter for three phase induction motor.

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Why is CT ratio 1 or 5?

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What is CT ratio in transformer?

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Write the expressions for delta connected resistors in terms of star connected resistors.

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Write the expressions for star connected resistors in terms of delta connected resistors.

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What is the relationship between resistance connected in delta and equivalent star system?

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Give the relationship between resistances connected in delta and equivalent star systems ?

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How to calculate CT ratio formula?

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How to calculate CT ratio?

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What is the relationship of line and phase voltages and currents in a delta connected system?

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What is the relationship between the line voltage and the phase voltage in a delta connected load?

What is the relationship between the line voltage and the phase voltage in a delta connected load?
Answer : In a delta-connected load, the relationship between the line voltage (\(V_L\)) and the phase voltage (\(V_\phi\)) is: \[ V_L = V_\phi \] ### Explanation: - **Line Voltage (\(V_L\))** is the ... line voltage is √3 times the phase voltage. So, in summary: - **Delta Connection**: \(V_L = V_\phi\)...

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What are the advantages of star and delta connected systems?

What are the advantages of star and delta connected systems?
Answer : Star and delta connections are two different ways to connect three-phase electrical systems, and each has its own advantages depending on the application. Here's a comparison: ### **Star Connection (Wye ... voltage step-up or step-down (via transformers), and delta used for power delivery to loads....

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What is Delta connected and star connected?

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What is the formulae for delta and star connected system?

What is the formulae for delta and star connected system?
Answer : In electrical engineering, Delta (Δ) and Star (Y) connections refer to the way the windings of three-phase systems (like transformers and motors) are connected. Here are the key ... electrical systems and help in calculating voltages, currents, and impedances for different types of connections....

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What is the difference between star connected load and delta connected load?

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What is the formula for Delta and star connected system?

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What is the formula for Delta and Star connected system?

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What is the turn ratio of Delta to star?

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How does a current differential protection scheme handle CT ratio mismatch?

How does a current differential protection scheme handle CT ratio mismatch?
Answer : A current differential protection scheme is designed to detect faults in electrical systems by comparing the currents entering and leaving a protected zone. The idea is to ensure that the current entering the ... want to dive deeper into any of these techniques or want more examples, let me know!...

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Why Delta Star Transformers are used for Lighting Loads?

Why Delta Star Transformers are used for Lighting Loads?
Answer : Delta-Star transformers are commonly used for lighting loads for a few important reasons: 1. **Voltage Compatibility**: Lighting systems often require a lower voltage, typically 230V or ... Star transformer configuration helps provide a stable, reliable, and safe power supply for lighting loads....

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What is the significance of phase shift in three-phase transformers?

What is the significance of phase shift in three-phase transformers?
Answer : The phase shift in three-phase transformers is significant because it affects how power is transferred between different parts of the system and how voltage and current behave when the ... power delivery, maintain system stability, and avoid any potential issues like imbalances or inefficiencies....

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What is the difference between a delta and wye connection in three-phase systems?

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How does a current transformer (CT) differ from a voltage transformer (VT) in protection systems?

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How do you calculate the turns ratio of a transformer?

How do you calculate the turns ratio of a transformer?
Answer : To calculate the turns ratio of a transformer, you need to know the number of turns in the primary coil (\(N_p\)) and the number of turns in the secondary coil (\(N_s\)). The turns ratio ... turns in the secondary coil. - You can also use the voltage or current ratio to calculate the turns ratio....

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What is the connection of 3-phase motor star and delta?

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Is star delta single phase?

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What is the phase shift from star to delta?

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List the conditions for parallel operation of three-phase transformers.

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What are the applications of various types of three-phase transformers?

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Write any two differences between single-phase and three-phase transformers.

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How do you calculate transformer turns ratio?

How do you calculate transformer turns ratio?
Answer : To calculate the turns ratio of a transformer, you need to know the primary and secondary voltages. The turns ratio (denoted as \(N\)) is the ratio of the number of turns of wire in the ... s a step-down transformer (decreases voltage), the primary coil will have more turns than the secondary coil....

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How to calculate transformer ratio?

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What is the difference between Delta and star connection Transformer?

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Explain the relation of V2 and I2 based on the load connected to the transformer.

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What is the relationship between the voltage and current in a star and delta connection?

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What is the difference between a current transformer (CT) and a Rogowski coil?

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A 3 phase line of 4 km length delivers 4000 kW at a p.f of 0.8 lagging to a load the resistance and reactance per km of each conductor are 0.2 Ω and 0.5 Ω respectively if the voltage at the supply end is maintained at 11 kV. Calculate the received end voltage and efficiency of line.
Answer : Let's break down the problem step by step and calculate the received end voltage and the efficiency of the line. ### Given Data: - Power delivered to the load, \( P = 4000 \, \text{kW} \) - Power factor, \( \text{p. ... voltage**: \( 10.43 \, \text{kV} \) - **Efficiency of the line**: \( 98.61\% \)...

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