Is it efficient to keep a transformer operating under no-load condition for 50 minutes, given an intermediate load (like an air conditioner) with a 50 minute turn-off time and 10 m... Is it efficient to keep a transformer operating under no-load condition for 50 minutes, given an intermediate load (like an air conditioner) with a 50 minute turn-off time and 10 minute turn-on time?
Understand the Problem
The question asks whether it is more efficient to leave a transformer energized (at no-load) during a 50-minute air conditioner off-cycle, compared to de-energizing it. This requires considering the energy losses associated with both scenarios.
Answer
It's generally inefficient to keep a transformer running with no load for 50 minutes versus cycling it with the air conditioner.
It is generally inefficient to keep a transformer operating under no-load conditions for an extended period like 50 minutes, especially when compared to turning it off and on to match the load demand of something like an air conditioner. Transformers consume energy even when no load is connected, due to core losses (hysteresis and eddy current losses). Repeatedly turning the transformer on and off might introduce switching losses and stress, but the energy wasted during the no-load period often outweighs these concerns, particularly if the no-load period is long.
Answer for screen readers
It is generally inefficient to keep a transformer operating under no-load conditions for an extended period like 50 minutes, especially when compared to turning it off and on to match the load demand of something like an air conditioner. Transformers consume energy even when no load is connected, due to core losses (hysteresis and eddy current losses). Repeatedly turning the transformer on and off might introduce switching losses and stress, but the energy wasted during the no-load period often outweighs these concerns, particularly if the no-load period is long.
More Information
Transformers have losses even when there is no load connected. These losses result from magnetizing the core material (hysteresis losses) and eddy currents in the core. The amount of energy consumed under no-load depends on the transformer's design and size.
Tips
A common mistake is assuming transformers only consume power when actively supplying a load. Core losses are always present when the transformer is energized.
Sources
- Solved : Assume that a transformer is supplying an | Chegg.com - chegg.com
- Dry transformer no-load consumption - Mike Holt's Forum - forums.mikeholt.com
- Transformer that doesn't take power when not used - electronics.stackexchange.com
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