Answer / subrat kumar das

Transformer noise is caused by a phenomenon called
magnetostriction. In very simple terms this means that if a
piece of magnetic sheet steel is magnetized it will extend
itself. When the magnetization is taken away. I goes back
to its original condition. A transformer is magnetically
excited by an alternating voltage and current so that it
becomes extended and contracted twice during a full cycle
of magnetization.

Answer / nimish

when A.C. supply is given to ferrite material there is a
change in its length this procedure is known as
magnetostriction and we know that transformer core is
consist of ferrite material and this change in length
causes humming during its running condition.

Answer / niranajn

Is because of humming sound which is an account of
magnetostriction

Answer / nani

Transformer noise is caused by a phenomenon called
magnetostriction. if we r not proporly revited iron
pieces

Answer / amresh marik

this is simply because of magnetostriction...when
A.C.excitation is supplied then due to change in its core
length a pecculier sound produced.

Answer / ajay rastogi

magnetostriction and we know that transformer core is
consist of ferrite material and this change in length
causes humming during its running condition

Answer / karthik

it indicates the oil which is used in tranaformer is less
and is insufficient for the windings

Answer / ravi chandra

transformer noise may be due to,
# Improper core insulation
# aging through continuous running condition which leads to
expansion of core material(Magnetostriction)

Generally if T/F is found noisy at full load conditions and
I think that cannot be avoided but minimized by applying
relevant lubricant over the core.

Answer / akr

DUE TO LAMINATED MAGNETICE CORE HUMING NOISE COMES IN TO
TRANSFORMERS

Answer / sanoj

While under working condition, stress is built up in the
cores and windings of the transformer. Due to these stresses
noise is produced.

After synchronizing the running generator with grid, the avr getting tripped and the generator breaker also oettong tripped, before tripping the avr the pf meter of generator is showing leading pf please kindly give a suggestion to rectify this problem.

2 Answers   Thermax,

Uses of induction motor

6 Answers   NTPC,

Pure inductive ckt takes power from AC when 1. Applied voltage and Current increases 2. applied voltage and current decreses 3. voltage decreases and current decreases please justify

2 Answers  

Can we use the Poly Phenly Sulphide instead of Poly Phenly Ether? Do clarify your opinion.

1 Answers  

dc supply given to dc generator winding.how is possible? my knowledge is saying the winding will burn. please reply.

0 Answers  

how to use single phase supply for a three phase equipement.

0 Answers  

Is it possible to download the Siemens Selection Chart(TYPE 2 coordination) for 1) fuseless selection 2)Fuse selection

0 Answers  

can any one tell in easy method for circulating current ??

0 Answers   Quest,

Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?

0 Answers  

what are the reasons for overheating in electrical machines?

3 Answers  

in power generator normaly voltagr betwween esth to neutral is 0 but my work place generator show the volatge is 60v any body know why? thanks

0 Answers  

how to claculate earth strip size for 1500kVA transformer for neutral and body

4 Answers