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 Spacer Frequently Asked Questions: Buck-Boost Transformers
What is a transformer?
What is an isolation transformer?
Can transformers be used at ambients other than 40C?
What is the effect of altitude on a transformer?
What is regulation?
What is temperature rise?
What is hot spot?
Is one insulation system better than another?
Can a single phase transformer be used in a three-phase operation?
What type of winding material is utilized in transformers?
Can General Purpose transformers be reverse connected?
Can General Purpose transformers be used at frequencies other than that shown on the unit?

View more information on Micron's Buck-Boost Transformers.


What is a transformer?
A transformer is a passive electrical device which is designed to change one voltage to another by magnetic induction.
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What is an isolation transformer?
An isolation transformer, also referred to as an insulating transformer, is one where the primary and secondary windings are separate, as opposed to an autotransformer where the primary and secondary share a common winding.
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Can transformers be used at ambients other than 40C?
Transformers may be used at ambients less than 40C at full nameplate capacity. For ambients above 40C, they must be derated as follows:
Maximum Ambient Temperature     Maximum Percent of Load
   
180°C Units       105° Units
40°
50°
60°
100%       100%
90%       78%
79%       50%

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What is the effect of altitude on a transformer?
A transformer may be used at full nameplate capacity up to 3300 feet (1000 meters). Above that altitude, the capacity of the transformer should be derated by 0.3% for each 300 feet of elevation above 3300 feet.
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What is regulation?
Regulation is the change in output voltage when the load is reduced from rated value (full load) to zero (no load) with input voltage remaining constant.
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What is temperature rise?
Temperature rise is the difference between the average temperature of the transformer windings and the ambient temperature.
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What is hot spot?
The hot spot is an allowance selected to approximate the difference between the highest temperature inside the transformer coil and the average temperature of the transformer coil.
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Is one insulation system better than another?
One insulation system is not necessarily better than another. Each will typically provide a comparable life expectancy. The choice of an insulation system depends upon application, performance, and cost considerations.
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Can a single phase transformer be used in a three-phase operation?
Single phase transformers may be used in a three phase application in one of the following ways:

  • Connect the primary leads to any two wires of the three phase source to obtain a single phase output using a single transformer.
  • Bank three single phase transformers to be connected in either a delta-delta or delta-wye configuration for a three phase output. The equivalent three phase capacity when properly connected is three times the nameplate rating of each individual single phase transformer.

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What type of winding material is utilized in transformers?
Transformers are typically wound with either copper or aluminum conductors. There is no difference in ultimate electrical performance between the two. All Micron General Purpose and Buck-Boost transformers 2KVA and below are copper wound. Units 3KVA and larger are aluminum.
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Can General Purpose transformers be reverse connected?
Single phase General Purpose transformers rated 3KVA and above can be reverse connected with no loss in capacity and with voltage stability. Single phase units rated 2KVA and below have compensated windings. These may be reverse connected, but the output voltage will be less than nameplate due to the compensation factor of the windings.
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Can General Purpose transformers be used at frequencies other than that shown on the unit? Units designed for 50/60Hz operation can be utilized at frequencies up to 400 Hz. Units designed for 60 Hz can similarly be used at frequencies up to 400 Hz but cannot be used at 50 Hz operation.
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