Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Consider the following statements:The VAR inj...
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Consider the following statements:
The VAR injection in a power system is obtained by:
1. Tap changing transformers
2. Synchronous condensers
3. Capacitor and inductor banks
4. Inductor banks
Which of the following statements given above are correct?
- a)1, 3 and 4
- b)1, 2 and 3
- c)2 and 3 only
- d)2, 3 and 4
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the following statements:The VAR injection in a power system ...
The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turn’s ratio of the transformer.
Synchronous condensers and capacitor banks are used to inject leading VAR into system where as inductor banks are used to inject lagging VAR into system.
Most Upvoted Answer
Consider the following statements:The VAR injection in a power system ...
Understanding VAR Injection in Power Systems
VAR (Volt-Ampere Reactive) injection is crucial for maintaining voltage levels and improving power factor in power systems. The options provided relate to various devices that manage reactive power.
1. Tap Changing Transformers
- Tap changing transformers are primarily used for voltage regulation, adjusting the transformer turns ratio to maintain output voltage levels.
- They do not directly inject reactive power (VARs) into the system.
2. Synchronous Condensers
- Synchronous condensers are machines that can either absorb or provide reactive power.
- They operate like synchronous motors running without a mechanical load, thus contributing significantly to VAR support.
3. Capacitor and Inductor Banks
- Capacitor banks are used for reactive power injection, enhancing voltage stability and improving power factor.
- Inductor banks can absorb reactive power, helping in voltage regulation under specific conditions.
4. Inductor Banks
- Inductor banks specifically are used to absorb excess reactive power, thus supporting the system in cases of over-voltage.
Correct Combinations for VAR Injection
Given the above explanations:
- Option 1 (Tap Changing Transformers) is incorrect for VAR injection.
- Option 2 (Synchronous Condensers) is correct.
- Option 3 (Capacitor and Inductor Banks) is correct; it includes capacitors which inject VARs.
- Option 4 (Inductor Banks) is also correct as they absorb VARs.
Therefore, the correct answer is option D: 2, 3, and 4, as they are the only components that actively manage reactive power in a power system.
VAR (Volt-Ampere Reactive) injection is crucial for maintaining voltage levels and improving power factor in power systems. The options provided relate to various devices that manage reactive power.
1. Tap Changing Transformers
- Tap changing transformers are primarily used for voltage regulation, adjusting the transformer turns ratio to maintain output voltage levels.
- They do not directly inject reactive power (VARs) into the system.
2. Synchronous Condensers
- Synchronous condensers are machines that can either absorb or provide reactive power.
- They operate like synchronous motors running without a mechanical load, thus contributing significantly to VAR support.
3. Capacitor and Inductor Banks
- Capacitor banks are used for reactive power injection, enhancing voltage stability and improving power factor.
- Inductor banks can absorb reactive power, helping in voltage regulation under specific conditions.
4. Inductor Banks
- Inductor banks specifically are used to absorb excess reactive power, thus supporting the system in cases of over-voltage.
Correct Combinations for VAR Injection
Given the above explanations:
- Option 1 (Tap Changing Transformers) is incorrect for VAR injection.
- Option 2 (Synchronous Condensers) is correct.
- Option 3 (Capacitor and Inductor Banks) is correct; it includes capacitors which inject VARs.
- Option 4 (Inductor Banks) is also correct as they absorb VARs.
Therefore, the correct answer is option D: 2, 3, and 4, as they are the only components that actively manage reactive power in a power system.
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Consider the following statements:The VAR injection in a power system is obtained by:1. Tap changing transformers2. Synchronous condensers3. Capacitor and inductor banks4. Inductor banksWhich of the following statements given above are correct?a)1, 3 and 4b)1, 2 and 3c)2 and 3 onlyd)2, 3 and 4Correct answer is option 'D'. Can you explain this answer?
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