what is CRGO Transformers?
Answer Posted / anuj kumar
Every type of steel has "grains" which consist of "
domains". These "domains" are nothing but electrica
l charges
oriented in any random direction. Therefore if a Tr
ansformer were to be made of Mild Steel used as cor
e material,
the core loss would be approx. 16 to 17 w/kg at 1.5
T/50Hz and the size of the Transformer would be app
rox. 18 to
20 times the size of a Transformer manufactured wit
h GO steels.
The main difference between regular "carbon" steels
and GO steels are:
1.
The size of the "grains" in GO steels are purposely
"grown" and made bigger and are about 10 times the
size of the grains in regular steel, thereby reduci
ng the hystereses losses. The size of grains in CGO
S is 2
mm to 5mm and HGOS is 5mm to 20mm. In regular steel
s the size of a grain is less than 0.5mm.
2.
The grains in GO steels are all aligned almost para
llel to the direction of rolling of the steel (i.e.
the length
of the steel). The angle of mis-orientation (i.e. d
eviation from the rolling direction) is maximum 7%
for
conventional GO and less than 3% for Hi-B GO steels
. This reduces the hystereses losses as "switching"
(explained later) becomes easier within the domains
.
3.
The chemical composition of the GO steels has about
3.2% of Silicon as an alloy, thereby increasing th
e
specified volume resistivity of the steel, thereby
reducing the eddy currents. GO Steels are also
decarbonised and have no more than 0.06% of carbon
in their chemical composition, which prevents
aeging of the steel.
4.
There is a special carlite insulation coating on th
e steel, which reduces the inter-laminar eddy curre
nt
losses within the core.
Is This Answer Correct ? | 8 Yes | 1 No |
Post New Answer View All Answers
How to calculate multiplication factor in kva example 500kva ans pls ?
HOW TO CALCULATE ELECTRICAL, MECHANICAL,& OVERALL EFICIENCY OF GAS ENGINE POWER PLANT
What is minimum phase system?
Why induction motor is widely used in industry
what are problems caused by the pdu in rack server
hi friend i am going too attend for hpcl in this month please help me by sending written test question papers i am in the stream of E.E.E
how can found motors folt current ? how can disided circuit breakers caoicity and breaking capicity ?
What is the difference between grid and off- grid system??
Why does the speed regulating system adopting I controller have no steady-state error? In this single closed-loop speed regulating system, when the input of the I controller Un=0, what is the output voltage of the regulator? What factors do the output voltage depend on?
Explain the working of variable frequency transformer?
In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes
"TRANSFORMER MODELING AND ANALYSIS" MEANS WHAT AND WHICH TOPICS U READ IN THIS
what type of earthing do for dry fissure rock?
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
what is RFCT and Insulgard Relay & It's function?