Switch on a transformer but with no load connected

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Discussion Overview

The discussion revolves around the operation of transformers when no load is connected to the secondary path. Participants explore the implications of this scenario, including potential risks and operational characteristics, with a focus on both theoretical and practical aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant questions whether a transformer will burn if switched on without a load connected, indicating a concern about potential damage.
  • Another participant argues that if the voltage remains consistent with the transformer's specifications, it should operate cooler without a load, describing the transformer as functioning like an inductance in this state.
  • A third participant distinguishes between current transformers and voltage transformers, suggesting that the risk of damage may depend on the type of transformer in use.
  • One participant emphasizes safety, advising against working with high voltages without adequate knowledge and experience, particularly highlighting the dangers associated with AC mains power.
  • A participant shifts the topic to seeking assistance with rewiring an alternator for wind power generation, indicating a practical application of electrical concepts.
  • Another participant provides information about the differences between voltage transformers and automotive alternators, cautioning against using transformers with wind turbine alternators due to their variable output frequency.

Areas of Agreement / Disagreement

Participants express differing views on the implications of operating a transformer without a load, with some asserting it is safe while others raise concerns, particularly regarding specific types of transformers. The discussion remains unresolved regarding the potential risks involved.

Contextual Notes

Participants mention various assumptions about transformer operation, including the importance of voltage and type of transformer, but these assumptions are not universally agreed upon. There are also references to safety precautions that are context-dependent.

Who May Find This Useful

This discussion may be useful for individuals interested in electrical engineering, transformer operation, safety practices in handling electrical equipment, and those exploring renewable energy applications such as wind power generation.

jxlee
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If i switch on a transformer but with no load connected to the secondary path.Is the transformer will burn?
 
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No. If the voltage is the same as the transformer normally gets, it should run cooler than if it had a load on the secondary.

A transformer without a load on the secondary is just an inductance. So, the current in this is determined by the supply voltage, the frequency and the inductance and resistance of the primary winding.

Many appliances switch power in the secondary circuit so that the primary is always connected to the mains. This does waste some power (compared with turning off the primary) and it also leaves the primary vulnerable to mains voltage surges.
 


Yes, if it is a current transformer.
NO, if it is a voltage transformer.
Please inform me if you need more explanation.


-----------------------------------------------------------------
Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com
 


If you are unfamiliar with transformers, I recommend that you do your learning and experimentation with low voltages, like 24V ac. Please do not work with 115V ac until you acquire sufficient education/experience. One mistake could be the last. I've been an EE for 32 yrs., and I never work on 115V ac alone in the lab. I always use one hand when handling hazardous voltages.

Please heed my advice. The ac power mains are not to be taken lightly.

Claude
 


I am trying to get help with rewiring an alternator for wind power generation is there any help here?
 


Here is a site that built an alternator for a wind turbine.
http://www.fieldlines.com/story/2009/4/4/214533/4539
Voltage transformers are for a specific frequency. The output frequency of a wind turbine alternator varies all over the place, so don't try to use a transformer. Automotive alternators have a wound rotor with radial field lines, and the stator coil is outside the rotor. The rotor has slip rings for regulating the current. Thw wind turbine alternators have permanent magnet rotors with an axial field, and cannot be regulated. I hope this helps.
Bob S
 
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