Answer / yash

1. at HT side current value is less as compared to LT side.
2. insulatin requirement is less
3. tap changing can be smoother and it would have fine
control as no. of taps are more(due to low current)

Answer / k. tivaganon

In theory, tap changer can be in any side of the
Transformer. Normally, for a step-down Tr., we put the tap
changer on the High Tension side due to many number of
turns of winding, in which we can tap easily. On the
contrary, if we put the tap changer on the Low Tension
side, there is not much turn of winding to use!!! For the
Distribution Tr., normally the tap changer will be NVTC- No
voltage tap changer. That is, no voltage no current go
through the tap during the change of tap position (There
will be no spark!!!!) For larger Power Tr., OLTC- On-Load
tap changer will be used. Tap will change position under
energized power.

Answer / sanjay yadav

due to low current in HT side , Secondary side flow High
Current

Answer / a.sundar

Because of High Voltage in primary side, it will draw less
current. While changing the tap, Due to less current
sparking occurs less.
In secoondary side low voltage, so high current in
secondary, and more sparks due to high current.

Sundaramahalingam_a@yahoo.in

Answer / k1

There are two reasons; one reason from electrical and the
second one from practical point of view:
1- Low current on HV side makes tap changing smoother and
lowers stresses on the diverter switch.
2- HV windings are generally on the LV windings(consider
concentric HV and LV windings). Therefore the wiring of the
taps would be easier in comparison to the case where the
taps on LV side may be wired through HV windings.

Answer / naaz

Because of in HT side voltage is large and current are less and chances of sparking are less that's why we provide tap changer in primary side

Answer / jayakumar

If only one tap changer is required, tap points are usually made on the high voltage, or low current, side of the winding to minimize the current handling requirements of the contacts. However, a transformer may include a tap changer on each winding if there are advantages to do so. For example, in power distribution networks, a large step-down transformer may have an off-load tap changer on the primary winding and an on-load tap changer on the secondary winding.


Reference from Wikipedia

Answer / ram sumer

This depends on your use,for which perpose transformer is
been used. If the transformer is usde for long distance
transmission line i mean in delta to delta HT transformer
tap changer will be provided on primary side. To cover the
line losses which make a cause of voltage drop,when primary
side tap is changed in ratio of that tap position secondary
will also increase or decrease the voltage as you desire.If
you provide it on secondary side it will oppose the primary
voltage
But in case of distibution transformer i mean delta to star
tap changer is provided at secondary side.

Answer / s hubertsubis

if you provide tap changer on ht side we variy the voltage
as we required at secondary side if we connect in secondary
side we can variy the current as the changes in load

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