Questions tagged [loss]

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28 views

Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?

Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
0
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1answer
25 views

High voltage DC point to point transfer

I have a contemplated DC electricity system that has a battery room at a distance from the use. The battery room would be about 150 feet away from where the power is used (for lighting, computer ...
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2answers
88 views

Where am I wrong about my calculation of power loss?

The power loss of circuit is \$16kW\$ when the power factor, PF, is 0.6 lag. Now if I improve the PF from \$0.6\$ lag to \$0.8\$ lag, what is the power loss now? The solution provide me the formula ...
4
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3answers
602 views

Why will the line loss decrease when the power factor increase?

QA: If the line loss is \$50\ kW\$ when P.F. is \$0.8\$, now if P.F. become \$0.95\$, what is the value of line loss? Solution: \$\frac{P_{L2}}{P_{L1}}=\frac{(cos\theta_1)^2}{(cos\theta_2)^2}=\...
2
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2answers
48 views

Why should we multiply Copper loss with \$ (\frac{1}{2})^2 \$, not \$(\frac{1}{2})\$ when the transformer is in half loading?

A 10 kVA transformer, its iron loss is 120 W, the copper loss is 240 W (full loading), now when the load factor is 0.9 delay, what is the efficiency when the transformer is in half loading? The ...
0
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3answers
85 views

Initial current value in capacitor charging circuit

From this video lecture how come the initial current values are different in two cases? I think they're assuming that the switch resistance is small in the first case. However how about if they're ...
0
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0answers
33 views

What is the intuition behind the pdf's in the Swerling models I and III?

I am looking at radar systems. In this context I have found that the detection probability is closely related to the SNR and that the fluctuation loss of an objects RCS is modeled by Swerling models. ...
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0answers
73 views

Magnetic loss of steel

The software called gprMax which simulates EM waves in varying environments. I am trying to enter steel has material but from the picture, it also requires the magnetic loss(ohm/meter). But I have ...
2
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0answers
34 views

What is the “short-range outdoor model (ITU-1411) with a distance-dependent path-loss” mentioned in this paper?

I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
0
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0answers
40 views

Power dissipation BJT transistor as voltage follower

Following the discussion from this thread I am finalizing my calculations. I am not sure that I am calculating the power dissipation correctly. Given the following circuit I need to operate the opamp ...
0
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0answers
39 views

Unexpected values from insertion loss calculation in IEEE P802.3cg documentation

I'm looking at the insertion loss calculations from an IEEE document on P802.3cg (10SPE Ethernet). On pages 6 and 7 they talk about insertion losses over the cabling in a multi-drop scenario. I'm ...
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0answers
55 views

Coax cable loss drops by approximately 0.5 dB at a specific frequency

I am trying to understand why the measured loss of our coaxial cable is decreased exactly at a specific frequency. My understanding is that the loss should be linear with the frequency. However, there ...
0
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0answers
27 views

Reading core loss graph of an inductor core

The question is somehow unrelated but I hope someone answers, From the above graph, how can I get the value of 0.3T line @ 25kHz ? The scales in the axes confused my mind.
1
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1answer
42 views

Insertion Loss & Return Loss - GSML2 Link

I have a GSML2 Link specification connecting Serializer and Deserializer via coax. While performing the SI analysis, I had a few doubts. In the deserializer datasheet, we have forward channel of ...
0
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1answer
53 views

Pulsed power calculation

I want to calculate power loss across a resistive load during a 1 ms interval. The experimental setup is such that the voltage and current through the load varies the whole period of 1 ms. I have 10,...
3
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7answers
2k views

Why do we use low resistance cables to minimize power losses?

Generally, one would like to minimize power losses via Joule heat. Intuitively, using low resistance cables (for example by using materials with low resistivity like copper) should do a better job ...
1
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2answers
183 views

What causes power losses in transmission lines?

From my understanding there are two causes for power losses in transmission lines: Losses due to resistance: \$ R = \frac{\rho l}{A} \$, where \$\rho\$ is the resistivity, \$A=\pi r^2\$ and \$ l \$ ...
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2answers
269 views

what does Loss Tangent means in capacitor?

As we know the definition of Loss Tangent in capacitor which it is: When a sinusoidal alternating voltage is applied to an ideal capacitor, the current advances by pi/2 in phase. In the case of a ...
0
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1answer
57 views

HC05 Bluetooth Ping without losing connection

I am currently working with the Bluetooth module HC05 using a Teensy 3.2 board. I successfully established a connection between the laptop and the board using Bluetooth. I can send data from the board ...
2
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2answers
105 views

Can't achieve the goals in designing and simulating Resonator circuit

Goals I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly. Requirements Source Impedance \$R_s = 100\ \Omega\$ Load ...
1
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1answer
51 views

Dielectric Loss for Constant Impedance

Are dielectric losses the same for two different 50ohm structures that are built in the same dielectric medium? Eg. Two 50ohm Stripline traces in FR4 where one is very skinny with close GND planes, ...
2
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1answer
255 views

Calculation of transmission loss of a power plant

What is the transmission loss due to heat if my power station produces electricity at a power of \$5 kW\$ and the electricity consumer is \$1 km\$ away? It is a copper line with a material constant ...
0
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1answer
61 views

Ohmic power loss due to electric field

Recently I read in the basic EM theory course , that the Ohmic power dissipated in a conductor is directly proportional to the conductivity and the square of the electric field intensity , but we know ...
2
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2answers
78 views

Can digital clocks and other electronic devices “ride through” a momentary power interruption?

I recently attended an electric utility training course discussing relay protection practices. One topic that came up was a fuse saving scheme where a protective reclosing device would momentarily ...
0
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0answers
50 views

Non-uniform temperatue distribution

Please assume a semiconductor chip like IGBT or MOSFET heated by a specific power loss. It is found that the more the power loss is, the more severe the chip's temperature distribution non-uniformity ...
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2answers
150 views

Loss due to impedance matching in a filter

I have a quite basic question, after starting to re-read some RF theory. If a voltage source has a resistance of 50 ohms, and the equivalent impedance of a connected bandpass filter and its load are ...
1
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2answers
6k views

Determining how much current I can actually run through my Cat6 24AWG Cables in my confirguration?

I want to use a CAT6 (24AWG) RJ45 cable to carry a total of 2A at 48V. As per the AWG Chart, I see that the Maximum amps for power transmission is 0.577A but the <...
0
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2answers
227 views

Ground losses in mains delivery network

It is my understanding that the mains distribution system (poles along the road, where I live) has occasional earth ground connections of the Neutral wire. Maybe every pole, or just every few poles, ...
0
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3answers
105 views

Link budget - Path-Loss in a Wlan Network

I am struggeling with the dB calculation on an wlan-network. An antenna has dBi but the pathloss in the air is dB with the formula 100 + 20 * log(km). Can I just mix dB, dBi and dBm? Here is a sample ...
1
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1answer
1k views

The effect of rust on a transformer core

I want to make a transformer with a core of laminated electrical steel sheets. I have some EI core sheets, 0.5mm thick. My design is for a gapped core transformer, and the shape of the gap is unusual, ...
0
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2answers
172 views

Power losses in long wires with multiple loads

I need to calculate power losses in long wires. I managed this for the case of constant currents. But in the real world, my loads are DC-DC regulators. The load draws 11W of power, network voltage is ...
0
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1answer
38 views

Maximum tolerance for a loop trace-antenna's capacitor

While going through the document at https://www.silabs.com/documents/public/application-notes/AN639.pdf I have read from "Figure 13. Loop Antenna Simulated Mag(Zin) vs. CP1" below that even a 2% ...
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1answer
1k views

Friction Coefficient of AC motor [closed]

Does the Friction Coefficient "B" of AC Motor changes with the change of a load connected to an AC motor? OR it is always constant?
0
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1answer
105 views

Effective or minimal area of core to calculate losses?

I've got a problem regarding the information given in coil's datasheet (PQ35/35: http://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/pq3535.pdf). There are two different areas given: ...
0
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1answer
73 views

Is it important to consider channel bandwidth of the signal to measure cable path loss for RF testing?

I am performing some RF tests for 802.11 and measuring path loss of the RF test setup, it has a mix of PSK & OFDM signals. I see the norm is to use a Continuous Wave signal to perform RF path loss,...
0
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1answer
196 views

Do I need to consider shunt admittance for line losses doing load flows?

If I have a long transmission line (Pi model) the current just go through the equivalent impedance of the line, but I've seen demonstrations that include this shunt admittance as if the current flows ...
0
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1answer
201 views

RF over-the-air signal loss inside an RF chamber

For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc. But for over-the-air/...
-2
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1answer
418 views

Capacitor loss in high frequency DC-DC converter

I have designed a boost converter: Vin = 60 V Vout = 150 V Switching frequecny: 340 kHz or maybe higher Filter capacitor: 1uF The picture is only a basic structure of boost converter, and what I ...
2
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1answer
380 views

Power losses of a switch

A power transistor is used to switch a 25 A, 600 V inductive load at a switching frequency of 100kHz with D=0.5. Turn-on and turn-off each occur in 100ns and the collector on-state voltage is clamped ...
1
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1answer
391 views

Why return loss gets ripples?

I tested an amplifier on a circuit board with a network analyzer. It was tested under input power of -20dBm, which is well within the linear region.The amplifier uses SMA connectors. The simulated ...
1
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1answer
569 views

Methods for measuring cable path loss in RF Testing

I have been reading about various methods to perform a Cable Path Loss for RF Testing but not being a core RF person, I needed some insights on how it is done in Field or Lab. Here is my understanding ...
1
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1answer
1k views

Compensating for power loss through resistor in high/low pass filter circuit?

Circuit design of a Low-pass filter borrowed from Wikipedia Article on the subject: Circuit design of a High-pass filter borrowed from Wikipedia Article on the subject: I'm thinking of implementing ...
1
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1answer
144 views

Cascade impedances and Return Loss

I have 75 Ohm connector connected to 75 Ohm Load trough 50 OHM PCB to PCB connector. What trace impedance should be on PCBs to get optimal Return Loss?
3
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1answer
2k views

Flyback Transformer core heating up

I am designing a Discontinous conduction mode flyback converter, 100kHz using UC3844 IC with the spec. 220V,50Hz to 5V 5A. The issue is that after testing it for an hour, the transformer starts ...
0
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1answer
1k views

Flyback converter losses

i have been designing flyback converter of a 5Volt 5 ampere specifications output deriving from 220v ac mains. But i have been stuck at one point and can't seem to get out it. Efficiency is ...
0
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2answers
703 views

Switching loss in a synchronous converter (buck, boost or buck-boost) when light load occurs

When a synchronous converter operates in high load condition,if the inductor current is always positive, the switching loss of the Synchronous mosfet is minor in comparison to the switching loss of ...
0
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1answer
86 views

Heat Cable: directly powered with 230V AC vs. 12V DC with step-down efficiency

Is it any less efficient to drive a 12V version of a heat cable from a step-down buck than directly powering a 230V version of it directly from the wall?
1
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2answers
73 views

Which of the two connections is best for reducing losses?

I have a choice between the following two set-ups for a project. Option One is to have the motor controller mounted close to the batteries but further away from the motor. Option Two is to have the ...
-1
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2answers
5k views

Calculating copper losses of transformer given iron loss and maximum efficiency

I wonder if anyone can help me understand copper losses in transformers a bit better. I'm having problems understanding the highlighted part on the attached picture half way down the page. I sure its ...
0
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1answer
945 views

A problem on Relay Power loss

On our quadcopter, we're carrying a switching circuit that would allow the switching between two batteries. When using the 2 Channel Relay Module, the quadcopter is having a hard time flying with it. ...