Podcast
Questions and Answers
Why is it considered completely normal for transformers to heat up?
Why is it considered completely normal for transformers to heat up?
What can be expected regarding the surface temperature of a plastic enclosed safety transformer at rated load and 40°C ambient temperature?
What can be expected regarding the surface temperature of a plastic enclosed safety transformer at rated load and 40°C ambient temperature?
Why is it difficult to touch a transformer's enclosure at a temperature of 70-80°C?
Why is it difficult to touch a transformer's enclosure at a temperature of 70-80°C?
In which scenario would a transformer's service life be considerably reduced?
In which scenario would a transformer's service life be considerably reduced?
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Why is it important to determine the load by KVA when sizing a transformer?
Why is it important to determine the load by KVA when sizing a transformer?
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What common standard KVA ratings are used for three Phase Delta-Wye transformers?
What common standard KVA ratings are used for three Phase Delta-Wye transformers?
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What is the purpose of a single-phase transformer in non-urban areas?
What is the purpose of a single-phase transformer in non-urban areas?
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What are the standard KVA sizes for single-phase transformers?
What are the standard KVA sizes for single-phase transformers?
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What is a common application of encapsulated single-phase transformers?
What is a common application of encapsulated single-phase transformers?
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What distinguishes a ventilated single-phase transformer from other types?
What distinguishes a ventilated single-phase transformer from other types?
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When are totally enclosed non-ventilated transformers ideal to use?
When are totally enclosed non-ventilated transformers ideal to use?
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Study Notes
Single-Phase Transformers
- Used in non-urban areas for power distribution due to lower demand and costs
- Step-down transformer to decrease home voltage to a suitable value without frequency change
- Standard KVA sizes: 1, 1.5, 2, 3, 5, 7.5, 10, 15, 25, 37.5, 50, 75, 100, 167, 200, 250, and 333
- Types:
- Encapsulated: for general loads, indoor and outdoor, with ratings from 50VA to 25 kVA
- Ventilated: for multiple single-phase indoor and outdoor loads, with ratings from 25 to 100 kVA
- Totally enclosed non-ventilated: for environments with high dirt and debris, with ratings from 25 to 500 kVA
Potential Transformers
- Used to step down voltage from a high level to a lower level with a small rating voltmeter
- Primary winding has a number of turns and is connected in parallel with the circuit
Distribution Transformers
- Also known as isolation transformers
- Function: alter high voltage to normal voltage (e.g., 240/120V) for electric power distribution
- Types:
- Single-Phase: used in non-urban areas where a three-phase supply is not required
- Three-Phase: used to hold electrical energy from the main distribution circuit to a minor distribution circuit
- Underground Residential Distribution (URD): a common power distribution system for modern cities
- Pad-Mounted: used in places where a fenced enclosure is not feasible
- Pole-Mounted: mounted on an electrical service pole to change high distribution voltage to low
Autotransformers
- A type of electrical transformer with only one winding
- Primary and secondary windings are linked together both electrically and magnetically
- Reduces cost over conventional transformers
Transformer Rating Plate
- Must include:
- Maker's name or initials
- Serial Number
- Current type (if DC)
- Phase (if single or three-phase)
- Rated Current
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Description
Test your knowledge about different types of transformers such as series transformer and potential transformer. Learn about their characteristics and applications in power systems.
