Transformers play an important role in the distribution of electricity-Understanding how transformers are used to alter the voltage of a supply is very important, as they form an important part of all electrical appliances, mobile phone, TV, radio, you just name it. In this slideshare however you will meet basic calculations and hints on how to solve them.
Transformers play an important role in the distribution of electricity-Understanding how transformers are used to alter the voltage of a supply is very important, as they form an important part of all electrical appliances, mobile phone, TV, radio, you just name it. In this slideshare however you will meet basic calculations and hints on how to solve them.
Faraday's law states that the electromotive force (emf) produced along a closed path is directly proportional to the rate of change of magnetic flux through any surface bounded by the path.
This is the simple ppt explaining about the main components of the power systems. especially we are determining the insulators and its types with real time pictures which are attractive,
The Presentation represents one of the electromagnatic effect on transmission line (The skin effect), other being the proximity effect.
The Following topics are covered :
1.Defination
2,Cause
3.Formula
4.Skin Depth
5.Mitigation Techniques.
Faraday's law states that the electromotive force (emf) produced along a closed path is directly proportional to the rate of change of magnetic flux through any surface bounded by the path.
This is the simple ppt explaining about the main components of the power systems. especially we are determining the insulators and its types with real time pictures which are attractive,
The Presentation represents one of the electromagnatic effect on transmission line (The skin effect), other being the proximity effect.
The Following topics are covered :
1.Defination
2,Cause
3.Formula
4.Skin Depth
5.Mitigation Techniques.
Implementation of SVPWM control on FPGA for three phase MATRIX CONVERTERIDES Editor
This paper presents a simple approach for
implementation of a Space Vector Pulse Width
Modulation (SVPWM) Technique for control of three
phase Matrix Converter (MC) using MATLAB/Simulink
& FPGA Software. The Matrix converter is a direct
AC/AC Power conversion without an intermediate DC
link. This converter is inherently capable of bi-directional
power flow and also offers virtually sinusoidal input
currents. The SVPWM technique improves good voltage
transfer ratio with less harmonic distortion. This paper
presents FPGA test bench waveforms & MATLAB
simulations of SVPWM pulses and output waveforms for
three phase matrix converter.
IC Design of Power Management Circuits (IV)Claudia Sin
by Wing-Hung Ki
Integrated Power Electronics Laboratory
ECE Dept., HKUST
Clear Water Bay, Hong Kong
www.ee.ust.hk/~eeki
International Symposium on Integrated Circuits
Singapore, Dec. 14, 2009
1. 1. In a string of three insulator units, the capacitance of each unit is C, from each conductor to
ground is C/3, and from each connector to the line conductor is C/5. Calculate the voltage across
each unit as a % of the total voltage. To what value the capacitance between the connector of
the bottom unit and the line has to be increased by a guard ring to make the voltage across it
equal to that across the next higher unit? [31.5%, 28.3%, 40.196%; 0.6833C]
Solution:
Apply KCL at node A
I1+Ia = i2 + Ix
V1(jwC) + v1(jwC/3) = v2(jwC) + (v2+v3)(jwC/5)
20v1 = 18v2 + 3v3 ………(1)
Apply KCL at node B
i2 + Ib = I3 + Iy
20v2 +5v1 = 18v3 ………(2)
Eliminating v3 from the above 2 equations
V2 = 115/128 v1
And , then v3 = 1.276 v1
Hence, v1 + v2 + v3 = V or v1 = 1/3.174 V = 31.5% of V
Similarly, v2 = 28.3% of V
2. And v3 = 40.196% of V
With Grading Ring
The first equation does not change, i.e. 20v1 = 18v2 + 3v3
But it is given that v2 = v3
Therefore v2 = (20/21)v1
Applying KCL at node B,
I2 + Ib = i3 + Iy
V2(jwC) + (v1+ v2)(jwC/3) = v3(jwC) + v3(jwCy)
But v2 = v3
1/3(v1 + v2)C = (v2)Cy
Cy = 0.6833C