Leakage Definition and 81 Threads

transformers -- winding resistance and leakage reactance Does anyone know what is meant by: 'determine the combined winding resistance and leakage reactance referred to the primary side'?

I am designing a small step up transformer and I'm trying to calculate leakage inductance and winding capacitance. The problem I'm having is when I search the web I find there is a ton of info on the subject. So I have no idea where to start. Can anyone explain to me how to calculate...

Homework Statement A cubic container with sidelength l has a small hole with cross sectional area a (a<<l). The gas has density ρ and pressure P. Find the initial rate of gas leakage given that the outside pressure is 0. Homework Equations The question mentions the formula p=ρc2/3 so...

Could someone please help me with this?? I am working on a problem with 2 pipes, one 100mm and one 150mm in diameter. The shape of the pipeline is a square. half is 100mm pipe and the other half is 150mm pipe. 1.If entire pipeline is filled with water, no leak and no supply, is pressure...

I am studying a problem releated to memory leakage. Now, there are many tools to check memory leak at run-time (dynamic analysis), and some tools can check memory leakage at compile-time (static analysis). But I have some questions: How do you think to prevent memory leakage from coding phase...

I'm studying mechanical engineering, just have a question on the labyrinth seal leakage equation. More specifically, the expansion ratio formula. What does the '1n' stand for? With 'n + 1n', I'm assuming those two n's are different since one looks like it's in italics and the other...

Hi, I'm facing the problem to model a methane leakage in a methane piping. I read the 3d on a vessel leakage https://www.physicsforums.com/showthread.php?t=92511 but the starting condition and model seems different A marine methane piping, usually present an inner and outer pipe. In the...

I have a cylindrical pipe of internal diameter of around 5mm, say capped at one end with pressurised fluid flowing though the other opening. If I have holes at the wall of the pipe, am i able to calculate the pressure loss due to water squirting out through those side holes?

When the dielectric in a capacitor polarizes does it effect the leakage current through the dielectric? Just wondering, if you had a capacitor with a lossy dielectric and you were able to polarize the dielectric would the leakage current drop? Can anyone give me any links for further...

Homework Statement Find the leakage conductance per meter of a cylindrical coax cable whose inner conductor (r1) is 0.125" (3.175*10^-3 m) and whose outer conductor (r2) = 0.5" (1.27*10^-2 m) if the space between them is filled with a material whose: \varepsilon_r = 2 and \sigma_c =...

Part of a new product we're designing needs a small iron-core D.C. electromagnet for an actuator. I designed the electromagnet's core to be circular: about 4.5mm in diameter with 200 Ampere-Turns in the coil. An axis-symmetric FEA showed the iron core to be near saturation, and producing a...

Im using the 7809 IC to get 9v regulated dc supply. However, I'm also getting about 14v ac in the output as well. I've tried putting a notch filter tuned to 60hz to remove the ac voltage, but its still there. I'm using this power supply to power tl072 op amps and I'm worried that the ac voltage...

I am looking to quanitfy our compressed air system leakage and have followed the usual steps of ensuring all air consuming products are off and then measuring load/unload times. I intended to use the following formula as found in relevant articles and webpages: % Leakage = (Tx100) / (T+t)...

My question is related to the leakage current occurring in a diode when connected in reverse bias mode. When the diode is forward biased, the source voltage first neutralizes the barrier potential and then the flow of current occurs. However, I am not able to understand how the current due...

1)Suppose I've taken two conductor plate in parallel and air is in between them.now if i apply a voltage across them then capacitance would form in between them and there must be some leakage current but they are very negligible that's why it can't be detectable.But if apply 500KV across two...

Homework Statement A non ideal capacitor having a 'leaky' dielectric where RL is the leakage resistance measured across the dielectric. A 100pF parallel plate capacitor has a mica dielectric of relative permittivelty Er = 12 and resistivity of p = 1014 ohm m. Calculate the leakage resistance...

leakage resistance of capacitor theory help?? Homework Statement i have worked out the answer to my question, yet it seems silly so have convinced myself its wrong. Please help, or tell me if I'm being stupid if you can?? a parallel plate capacitor Er=12, length=10mm, width=5mm, C=100pF...

Homework Statement We are doing an experiment with a radioactive 226 Radium source, demonstrating the ionizing power of alpha radiation using an electroscope. This is one of the assignments: Charge an electroscope (what is an effective way?); you will notice the gradual discharging of the...

Homework Statement Is there such experiment to detect pipe leakage using radiation? I have opted to use radio-isotopes conduct this experiment. Homework Equations None The Attempt at a Solution How do i go forward with designing this experiment, knowing that I can use...

1. Calculate the leakage resistance across a capacitor of 100pF that has a relative permittivity of 12 and a resistivitty of rho=10*14 2. Rl=rho x Er x Eo /C Rl=10*14 x 12 x 8.85*-12 / 100*-12 3. Rl=1.062*15 surley the leakage resistance can't be that high my friend said it...

We simulated a 200MVA synchronous -salient pole- generator, using the 2D finite-element simulation program OPERA (by Vector Fields). We are trying to determine some parameters of the generator such as transient, subtransient and synchronous reactances as well as time constants by applying...

leaking air?? Homework Statement Suppose we make a circular hole 3 millimeter in diameter in a balloon. Calculate the initial rate at which oxygen escapes through the hole (at 0° C), in number of oxygen atoms leaving the balloon per second. Homework Equations i used 1/4 nAv where n...

Trying to simulate leakage current, say from a reverse bias diode or even a dirty PCB. Getting funny results using the current source across the load. Anyone have any ideas. Basic voltage divider fed by CV source and a 1uA forward biased CC source across the VD tap. By the way, I'm fairly new...

Homework Statement I am trying to find the relevant equation to to solve the following problem, RL= leakage resistance measured across the dielectric A 100pF parallel-plate capacitor has a mica dielectric of relative permittivity [tex]\epsilon[/r]=12 and a resistivity of...

Hi all, I have a problem I hope someone could help. I have a pressurized dry Nitrogen vessel. Given a known leakage rate, how long will it take for the internal pressure to be equal to atmospheric pressure?

How can sub-wavelength (about 12 cm./2.45GHz) radiation escape a microwave oven door slit-under 1 cm. wide. Why not a Faraday cage?

I am thinking about the following situation. In a stagnation water loop, the pressure is building up. A crack occurs due to the expansion of the water. What will be the solution approach to determine the flow rate of the leakage? Please give some hints or references. Thank you.

Hey, I am currently reading about transformers and one aspect of the equivalent circuit that I do not understand is why the leakage flux is represented by an inductor? Any help on this would be much appreciated. Thanks!

In industry, do you use gamma ray or beta ray to detect oil leakage?

This is going back a ways, but we used to have a car (I think it was the '89 Camry) that seemed to affect our streetlights. The lights often seemed to go on or wink out as we passed under them. Was this one of those you-wouldn't-see-it-if-you-weren't-there things, where it only seems to be...

Let's say I have two NAND gates hooked up to a pull-up R and an inverter. If one NAND has HH input and the other LL, would there be a leakage current into LL input state gate?