What is the disadvantages of using auto transformers?

Answer 1

there can be a lot of leakage flux in auto transformer. because primary and secondary winding in auto transformer is not separated.

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There is no primary to secondary isolation.

Current rating is limited to the size of the conductor used for the entire winding.

And also With an autotransformer, there is a absolute electrical affiliation from primary to secondary. It is generally the case that the anterior coupling that exists with accustomed two-winding Transformers is a big advantage that would not be had with an autotransformer. For example, an autotransformer added readily couples voltage transients from one voltage to the other; with two-winding transformers, voltage transients are accompanying by the capacitive voltage affiliate aftereffect and may be suppressed.
A transformer is an apparatus that is used for reducing or increasing the voltage of an alternative current.

Answer 2

1.There can be a lot of leakage flux in auto transformer because primary and secondary winding in auto transformer is not separated.

2.There is no primary to secondary isolation.

Current rating is limited to the size of the conductor used for the entire winding.

3.With an autotransformer, there is a absolute electrical affiliation from primary to secondary. It is generally the case that the anterior coupling that exists with accustomed two-winding transformers is a big advantage that would not be had with an autotransformer. For example, an autotransformer added readily couples voltage transients from one voltage to the other; with two-winding transformers, voltage transients are accompanying by the capacitive voltage affiliate aftereffect and may be suppressed.

Answer 3

Performance of UPS

Transformer

Based UPS

Transformer

Free UPS

Size & Weight (smaller is preferred)

Good

Best

Location Flexibility

Good

Best

Input waveform management

Good

Best

Initial System costs

Better

Best

Uncertain Future Requirements

Better

Best

Adaptability/scalability

Better

Best

System Efficiency

Better

Better

Input/Output Configuration flexibility

Best

Good

Input / DC / Output Isolation

Best

Good

Availability

Best

Good

Fault management

Best

Good

Component count

Best

Good

Reduced need for paralleling for capacity

Best

Good

Robustness

Best

Good

Answer 4

unlike liquid filled transformers they are exposed to the surrounding environment, such as moisture, dirt and other airborne contaminents.

Answer 5

Compared with what?