Answer / shobana

Both are same. They are used in transmission lines for the
purpose of measurement and protection. Their primary is
connected between phase.The voltage is stepped down and the
secondary voltage is used for the above mention
purpose.Compared to power transformers, they have leeser VA
burden

Answer / venkatesh

voltage transformer is used for distribution of voltage
only but the potential transformers used for measuring
and protection purpose.

Answer / biswanath das

Voltage transformer is used for protection of high voltage
distribution transformer. It Compare the primary and
secondary voltage ratio of a transformer and to maintain
fixed voltage at secondary terminal, it sense to auto tap
changer of the transformer to maintain fixed voltage during
no load to full load.
Potential transformer is used for measuring heigh voltage.
It's Primery windings is connected to the high voltage
source & secondary voltage is only 110 volts

Answer / trevor

I'm not entirely sure about what you're asking, since
the "best" answer is pertaining to a CT, instead of a
PT/VT, but a potential transformer and a voltage
transformer are the same thing. They differ from a current
transformer. Both are used for metering and protection.

A PT is used to find out the voltage at a specific
location, and a CT is used to find the current travelling
through a specific conductor.

A PT is connected across two points, to find the voltage
between them. A CT works a little different. There are a
few different types (clamp-on/split-core, Hall effect,
optical), but essentially, a single conductor is passed
through the core of the CT and a current is induced in the
wires wrapped around the core. This current is
proportional to how many turns is around the core.

Answer / ajay kumar rathore

Potential transformer is a type of transformer basically
used for measurement of voltage in substation type area. It
is a step down transformer. In order to receive lesser
voltage on secondary side the turn ratio is generally kept
like 1000:1. Hence by measuring the secondary voltage we
can proportionally get the value of primary voltage.

Answer / anand kumar c

Both potential transformer and voltage transformers are
same. In some of the areas we will be mentioning it as a
voltage transformer(especially in measuring purpose). Both
are used for the measuring and protection purpose only(as i
mentioned same). these transformers step down the higher
voltages (primary voltages can be in kv's)to measurable
voltages(standard sec voltages are 110v, 100v, 63.5v,
57.7v ) in measuring instrument like voltmeter,
multimeter.

Answer / sanjay

which voltage transformer? wherw it use? please give detail?

Answer / randall christiansen

A potential transformer is a type of voltage transformer.
In other words, all potential transformers are voltage
transformers, but not all voltage transformers are
potential transformers.

All pts are inductive and connect directly to the primary
voltage. Some vts, such as cvts, connect to the primary
voltage through a capacitor, and are not inductive.

Both are generally used for the same function, to convert
the primary voltage to a smaller, readable secondary
voltage to be used for relaying, metering, or station
service.

Answer / thomas floyd

The principal difference between a voltage transformer and
potential transformer is its purpose. In general, a
voltage transformer is used to deliver power. A potential
transformer is used to provide a signal voltage to a meter
or protective relay. Potential transformers almost always
have a primary to secondary voltage ratio to step down a
higher voltage to 120 Vac. Thus, the deviation of its
secondary voltage from 120 Vac signals a deviation of the
higher voltage from its normal value.

Answer / abhinav gupta

a potential transformer is used to measure high voltages,
the output of a typical potential transformer may be 110v,
where as its high voltage side can be in kvs (11,33,110,220
etc.)in other words pts are only step down, now voltage tfs
are devices which either step up or step down voltages of
an electric current.

hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com

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