Electrical characterizing of superconducting power cable consisted
... A reliable AC loss measurement was carried out on the 1.5 m long prototype HTS
cable in order to quantify the AC loss of the HTS cable for cooling system design.
The experimental measurement method is based on the electrical four probe method
adopting a compensation coil to cancel the large inductiv ...
mcq-ele1 - WordPress.com
... 58. In order to achieve high accuracy, the slide wire of a potentiometer should be
(a) as long as possible
(b) as short as possible
(c) neither too small not too large
(d) very thick
59. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply
for the potent ...
... rotation but not both. The voltage induced would be very low but the currents of very large
amplitudes can be supplied by such machines. Such sources are used in some applications
like pulse-current and MHD generators, liquid metal pumps or plasma rockets. The steady
field can also be produced using ...
T E S L A The lost Inventions by George Trinkaus Here are the
... condition in one swing-back. As we have seen with the capacitor, the
disturbed electric medium, like a plucked guitar string, over-swings the
center line of equilibrium to one side, then to the other, again and
again, and this we know as vibration. In this way of looking at nature,
vibration is ener ...
VTU : Jan.-10 - Technical Publications
... · The Ohm's law gives relationship between the potential difference (V), the current (I)
and the resistance (R) of a d.c. circuit.
· It states that, the current flowing through the electric circuit is directly proportional to
the potential difference across the circuit and inversely proportional to ...
Reduction of heat sink common-mode currents in switching mode
... parasitic capacitance can be formed between the case of the
semiconductors and the heat sink. The insulating thermal
compound (Damiano et al., 2004) is the dielectric of this
capacitance. It is shown as isolator 1 in Fig. 1.
Common-mode EMI is usually the result of parasitic effects (Tihanyi, 1995). ...
Iza_MSthesis - Electrical and Computer Engineering
... are insulating. Capacitive coupled plasma sources are simple to fabricate and compact,
but they require more complicated electronics than DC sources to drive them. The fact
that the electric field is perpendicular to the electrodes limits the ion density achievable
with these devices. As the power a ...
Dynamos and dynamo design
... limited to the simplest principles of arithmetic and mensu
ration, and in no case is any greater knowledge of mathe
matics needed than the simplest elementary principles of
algebra, geometry, and trigonometry, with a thorough,
practical acquaintance with the use of the logarithmic table.
To effect t ...
CONTENTS - Working Group
... IEC 60076-2:1993, Power transformers – Part 2: Temperature rise
IEC 60076-3:1980, Power transformers – Part 3: Insulation levels and dielectric tests
IEC 60076-3-1:1987, Power transformers – Part 3: Insulation levels and dielectric tests.
External clearances in air
IEC 60076-5:1976, Power transforme ...
Optimal Choice for Number of Strands in a Litz
... for the small strand diameters that are found to be optimal,
and because its simplicity facilitates finding those optimal
diameters. Other models (such as  and the similar analysis
in ) also model large strand diameters and circular bundle
configurations accurately, but they fully calculate ...
DISTRIBUTION TRANSFORMERS 11 kV/433
... transformers are being procured by the utilities under this programme as well as with their own
resources to meet the GOI mission of Power for all by 2012. Recognising the importance of
standardization of specifications of the distribution transformer for procurement of quality
transformers, the Cen ...
Electromagnetic toroidal excitations in matter and free space
... Initially, the static toroidal dipole (or anapole) was introduced
as a configuration of static currents flowing on the surface of a
torus6 (Fig. 1). It was pointed out that the external field of such a
configuration is identically zero, whereas the currents create a magnetic field confined within th ...
transformer loss compensation for metermen
... transformer was a variable load connected to the load side of the meter. The load is made
up of two parts; the fixed portion, which keeps the transformer alive (no-load losses) and
the variable part, which changes with the load (load losses).
WHEN are transformer loss calculations performed?
A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.