Answer / pankaj sharma

CRGO Transformers:- are the transfomrer in which the core
material used is "Cold Rolled Grain Oriented " Steel. CRGO
steel core is having less hysteresis losses therefore the
efficiency is high as compared to normal core transformer.

Answer / sameer pise

Cold Rolled Grain Orientation silicon steel is material used
for transformer.silicon is BCC crystal and the grains of
silicon are not in alignment which reduces the permeability
of material.So in order to increase permeability Cold Rolled
Grain Orientation method is used thats why the name is CRGO
silicon steel

Answer / 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.

Answer / gtmanikandan

GRGO means Cold Rolled Grian Oriented Silican Steel
Lamination, it is Magnetization loss is very small comper
to other steel lamination plate

Answer / bhanu

What is fuse material ? Mention different types of fuse material.
Name - Bhanu
Electrical engineering
3rd semester
K.L POLYTECHNIC , ROORKEE , HARIDWAR

Answer / pichumani

There is nothing like CRGO transformer. The transformers
are provided with cores made of CRGO steel for higher
efficiency. CRGO is already explained in the other answers

what is difference between 5A and 100A CT constructional wise and operation?

1 Answers  

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

0 Answers  

how many types erthig

6 Answers  

What is AVR? Explain the function AVR?

11 Answers   HSL, NHPC,

Lux meter is the measuring device to measure the lux level of lighting fixture. in industrial sector two types of lighting fixture is being used as street lighting purpose 1. HPSV (Sodium) and 2. HPMV (Mercury). HPMV having white light which is an combination of red, blue and yellow colour, while HPSV haivng Yellow lighting. in HPSV red & blue colour will be absent. during measurement of the lux level of HPSV and HPMV fixture. 1. Lux meter can measure the actual lux level of both fixture? 2. or it will show false reading for HPSV fixture light as it has only yellow light present. please give me answer

1 Answers  

How to conduct Magnetic Balance Test, Measurement of Excitation Current (both on HV- and LV-side) and vector group on a 1000 KVA distribution transformer. There is a neutral on HV side.

1 Answers  

Here iam a question with SYNCHRONIZATION PANNEL related issue, as i want to design a SYNC.pannel board iam giving the 2 nos of 1MVA Generators to sync pannel , then what wil be the out put of the sync pannel, whether it wil be one cable coems from the sync panel or two cables.. as iam using two transformers to meet my load demand, so pls clear me whether two cables comes from sync panel to connect to transformers or only one cable

3 Answers  

why the no.of slots in stator in not equal to the no. of stator in rotor in induction motor????

4 Answers   Jindal,

What does impedance in the windings of transformer signify.

2 Answers   Johnson Controls,

What is the difference between KW & KVA ?

9 Answers  

why transformer neutral and CT Secondary neutral is connected to earth?

3 Answers   NCC,

why generation of electricity in low value voltage

3 Answers