Answer / md ahmeduddin farooqi

The linear variable differential transducer (LVDT) is a type
of electrical transformer used for measuring linear
displacement. The transformer has three solenoidal coils
placed end-to-end around a tube. The centre coil is the
primary, and the two outer coils are the secondaries. A
cylindrical ferromagnetic core, attached to the object whose
position is to be measured, slides along the axis of the tube.

An alternating current is driven through the primary,
causing a voltage to be induced in each secondary
proportional to its mutual inductance with the primary. The
frequency is usually in the range 1 to 10 kHz.

As the core moves, these mutual inductances change, causing
the voltages induced in the secondaries to change. The coils
are connected in reverse series, so that the output voltage
is the difference (hence "differential") between the two
secondary voltages. When the core is in its central
position, equidistant between the two secondaries, equal but
opposite voltages are induced in these two coils, so the
output voltage is zero.

When the core is displaced in one direction, the voltage in
one coil increases as the other decreases, causing the
output voltage to increase from zero to a maximum.

LVDTs are commonly used for position feedback in
servomechanisms, and for automated measurement in machine
tools and many other industrial and scientific applications

Answer / vsasikumar

The linear variable differential transducer (LVDT) is a type
of electrical transformer used for measuring linear
displacement. The transformer has three solenoidal coils
placed end-to-end around a tube. The centre coil is the
primary, and the two outer coils are the secondaries. A
cylindrical ferromagnetic core, attached to the object whose
position is to be measured, slides along the axis of the
tube.

An alternating current is driven through the primary,
causing a voltage to be induced in each secondary
proportional to its mutual inductance with the primary. The
frequency is usually in the range 1 to 10 kHz.

As the core moves, these mutual inductances change, causing
the voltages induced in the secondaries to change. The coils
are connected in reverse series, so that the output voltage
is the difference (hence "differential") between the two
secondary voltages. When the core is in its central
position, equidistant between the two secondaries, equal but
opposite voltages are induced in these two coils, so the
output voltage is zero.

When the core is displaced in one direction, the voltage in
one coil increases as the other decreases, causing the
output voltage to increase from zero to a maximum.

LVDTs are commonly used for position feedback in
servomechanisms, and for automated measurement in machine
tools and many other industrial and scientific applications

Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phase mixed loads. Power room has ammeters connected via CTs for individual phase. Now I know that readings shown on meter for each phase say R,Y and B are line currents. But when I want to know the total on transformer do I need to add the currents of all three phases readings shown on meter or value for anyone phase will give me the correct power load on transformer for that point of time. 2. If ammeter shows unbalanced readings for R,Y, B phases say 150, 250 and 300 respectively so can I assume that 150A i.e average of 3 will be the 3phase load currents and remaining will be 1phase currents. Please clarify my doubt.

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