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.

Dear all: Recently we got a question about Interface between PMS and SAP-PM.once we got a update message from PMS.we should set the deletional flag for functional location in SAP system.Is there any FM or BAPI to use?There are only functional location create and change provided by SAP. Best regards!

0 Answers  

What is the minimum distance between taransformer (say 2000 kva)and its earth pit?

2 Answers   Bhel,

in an ac series circuit there are 30 bulbs are connected in a serial set.what will happen if one bulb is fused and we removed the bulb and reconnect with the remaining bulbs? (29 bulbs). will the brightness of other bulbs increase or not?

3 Answers  

why motor run slow speed in star connection?explain how?

3 Answers  

what will be the min and max voltage flow from neutral to earth?

0 Answers  

Why 11KV PT Secondaries [(11000/1.732)/(110/1.732)/ (110 / 3)]are in star connection ? And why the same should not be in delta ?

1 Answers  

What is the GI Earth Flat Size recomended for 33KV 2000KVA Distribution Transformer

1 Answers  

what is difference between inductive and reactiveload?

5 Answers   ONGC,

im electrical engineer, could any one help me for FEWA exam questions please ?

0 Answers  

The rating of Transformer are 11KV, 22KV, 33KV instead of 10KV, 20KV & 30KV?

2 Answers  

what is the earthing condition between earth & phase.

3 Answers   ABB,

Relation between magnetic field strenght and magnetic induction is a) Voltage b) current c) Speed d) tarque

1 Answers   Ecil,