Difference between Power & Distribution Transformer

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Topic

Power Transformer

Distribution Transformer
Rating
Above 200MVA
Around 10KVA-500KVA
Flux density
Much higher
lower
Voltage level
400KV,230KV,110KV,66KV,33KV
11KV,6.6KV,3.3KV,400V,230V
Used for
Transmission purpose at heavy load
used for the distribution of electrical energy at low voltage
Efficiency Level
Approximately 98-99%
Around 50-70%
Used in
Power plant, transmission line, transmission substation
Local areas
Insulation Level
High
Lower than power Transformer
Core loss
Higher
lower
Copper loss
Relatively lower as not at the end of consumer
higher
Winding connection
Primary-star
Secondary-delta
Primary-delta
Secondary-star
Load
Fully loaded
Not fully loaded
Cooling system
ONAN,OFAF,ONWF,OFWF
Usually ONAN
Tap changer
On -load
Off-load
Protection
Buchholz relay,
Explosion vent pressure relief,
Temperature indicator
Oil gauge level
Lightening arrestor
HRC fuse
Over current relay
Buchholz relay
Need for voltage regulation
No need
Important factor

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