Transmission lines Definition and 79 Threads

what is pre requisit to study transmission lines and wave guides...? I've studied vector algebra and vector calculus, is it enough or ?

If i wanted to make a 1:N coaxial RF switch (say ~100MHz, nothing too high), could you simply route N traces in a star pattern on a PCB and implement a mechanical switch to either connect to your measurement point, or terminate in the characteristic impedance (say 50 Ohm). I'm getting thrown...

I am using the "Three-Phase PI Section Line" Matlab-Simulink block from Simpowersystems blockset for modelling an electric power system transmission line. I had obtained the data from a research paper regarding the transmission line specifications (provided as sequence values). Since I am...

Here is the problem: http://postimage.org/image/1jy6nol5w/ Method 1: Steps 1. Calculate V(T1)=12*10=120V, V(T2)=10*10=100V 2. Since V(3)=10V and I(3)=1A, P(T3)=10W 3. Since not otherwise stated, Assume transformers are perfect. 4. So P(T3)= P(T2) = 10W 5. known...

I want to verify the theory of TEM mode tx lines how the signal travel. Please correct me if I am wrong. This mainly refer to stripline, microstrip( assume TEM) etc. 1) The signal is transmited as EM wave through the dielectric between the two lines, not actually current through the...

Why do reflections occur in transmission lines. Why does the wave travel back from the load?

"Transmission lines are specialized cables and other media designed to carry alternating current and electromagnetic waves of high frequency (radio frequency or higher), high enough that its wave nature must be taken into account. Transmission lines are used for purposes such as connecting...

I would like to know if Transposition on Transmission Lines could affect the basis and the way the power system is evaluated to set up the protection for the Transmission line? as compared to the non-transposed Transmission Lines. Thanks in advance, Regards,

If a source which has internal impedance 20 ohms is connected to multiple transmission lines of impedance somewhat equal to 20 ohms, which vary in length(maybe from 1" thru 8"). How do I analyze the reflections/draw the bounce diagrams. According to a patent -...

Homework Statement A typical power station produces 1000MW of electrical energy. Seven percent of the power is lost in a 500kV transmission line. Whats the lines resistance? Homework Equations P=I2R The Attempt at a Solution Thought this problem was simple but I keep getting it wrong. P=I2R...

Homework Statement This is not a HW problem. Just refreshing Tx line theory(reflections). I have a pulse of 3.3v, period 36nsecs. (Ton=18ns, Toff=18ns) with a source impedance of 50 ohms, connected to a tx line of impedance 50 ohms. The load is high impedance or infinity. So reflection at...

Hello. I am watching this video: https://www.youtube.com/watch?v=xIQtnQ9XPbE and he says there: I see that the wave turns into a "normal" sinus in the end, but it's not constant. I think, that even on an unmatched transmission line, the waves should go back and forth, but eventually...

well, if we lay power lines along rails and use the magnetic field to lift trains, would it increase the transmission loss?

I had set up an inductive and capacitative ladder network to model a coaxial cable( or low pass filter)- 20 sections of L= 0.1 H and C=0.11 microF That works out as a characteristic impedance of 953ohms. The circuit starts at a signal generator, then 5ohms resistor before the low pass...

Edit: My question is better expressed in my next post so ignore this post. Homework Statement A power station delivers 890 kW of power at 12 kV to a factory through wires with total resistance 5.0 \Omega How much less power is wasted if the electricity is delivered at 50 kV rather than 12 kV...

How can people get internet access through their power lines? Wouldn't all the transformers act as low pass filters and destroy your carrier signal? Also, with things being turned on and off constently, wouldn't it be too noisy?

My understanding is that the capacitance of a typical transmission line will increase proportionally to it's length. So in the case of a simple passive LPF circuit, consisting of just the LPF and the transmission line to the load (of infinite impedance), this would in turn mean the cut-off...

Homework Statement A power station delivers 890 kW of power at 12 kV to a factory through wires with total resistance 5.0 \Omega. How much less power is wasted if the electricity is delivered at 50 kV rather than 12 kV? Homework Equations eq-1) P = IV eq-2) P = I2R Ohm's Law...

Ok when they taught me about this they kept saying the power loss = I2*R Well isn't the power loss also = V2 / R Now before you give me the regular answer of "this V is not the same as this V", i understand. However, from what i know from the voltage divider rule is that the V across the...

...no, not the cool one, the one found at the end of transmission lines (sorry). Well here's my question; I believe you need to terminate transmission lines with the same impedence as the characteristic impedence of the line itself in order to prevent reflections from the end and 'ringing'...

note: I really hope I'm not rehashing a thread that already happened or posting this in the wrong forum... I did some searching, and couldn't really find anything related, but if this is in the wrong place or old news, feel free to yell at me. semi-irrelevant background: I'm currently...

Homework Statement A pair of power transmission lines each have a 0.850 Ω resistance and carry 779 A over 9.85 km. If the rms input voltage is 39.5 kV, calculate the voltage at the other end. Homework Equations The Attempt at a Solution

Homework Statement A family built a cabin directly under a 138kV, 60 Hz alternating voltage power line in the countryside. They assembled a huge coil under the cabin roof intending to tap off electrical energy from the overhead power lines (no wires are attached to the power lines) a) How...

Show that the power loss in transmission lines, PL, is given by PL = (PT)^2 X R/(V^2), where PT is the power trasmitted to the user, V is the delivered voltage, and R is the resistance to the power lines. I don't even know where to start. I am so confused by this chapter, I don't know what...

Hi all, I'm currently studying up on transmission lines for my next midterm, and I stumble onto this problem. Given information: A 800 MHz transmission line that is lossless - Vmax, Vmin, V_L for a given load impedance R_L. - Characteristic impedance of a line - length of a line & \lambda...

o:) utopia: superconductors for transmission lines globally? o:) undefinedundefined i want to develop a model ,entailing all the parameters required to transmitt power using SUPERCONDUCTORS . IF ANYBODY CAN HELP ME PLEEZE POST THE NUMERICAL DATA REGD THE SAME ,this will be highly acknowledged...

hello frnds, I am in jeopardu regarding d thing ,so u gyz uot there pleeze tell me can we have a inductance of a transmission line placed in vaccum? hope u gyz will pull me outta this soup.

I was just curious if anyone would know how I could go about getting maps of powerlines in various locations? Is it even possible to do so? The reason I'm wondering is to find places to go riding. I know some powerlines are open to offroad vehicles, whereas others are not, or are on private...

what are the environmental issues accompanied with the electrical powerplants and the overhead transmission lines :surprise: :surprise: could anyone please suggest helpful web sites