What is High voltage: Definition and 162 Discussions

High voltage electricity refers to electrical potential large enough to cause injury or damage. In certain industries, high voltage refers to voltage above a certain threshold. Equipment and conductors that carry high voltage warrant special safety requirements and procedures.
High voltage is used in electrical power distribution, in cathode ray tubes, to generate X-rays and particle beams, to produce electrical arcs, for ignition, in photomultiplier tubes, and in high-power amplifier vacuum tubes, as well as other industrial, military and scientific applications.

View More On Wikipedia.org
Recent contents Top users
  1. J

    High voltage not reaching Detector

    Hi, I'm working on fixing a preamplifier connected to a semiconductor detector. The high voltage bias supply is working ok, and the preamplifier preamplifies. I've confirmed this with a digital oscilloscope and a square wave generator under many different regimes. The preamplifier components are...
  2. H

    Why can a bird survive on a high voltage power line without getting fried?

    Homework Statement Birds can be seen perched on a high voltage power line yet seem unaffected by the high voltage. This is due to... A) Low resistance of the birds compared to the wire, minimizing current through the birds B) birds keeping only one foot on the wire, thus not completing a...
  3. J

    How to measure high voltage (1500V, very low current) accurately

    Hi, I have a High Voltage supply on an integrated circuit board installed in a Pentium I computer, that (in theory) can give a 0-3200 V Bias Supply to a Germanium detector, and only 0-1000V multimeters to test with. I have a Soviet analog multimeter, a cheap new one (digital) and...
  4. B

    Create High frequency High voltage signal

    Hi all, For my research I would like to create a high frequency high voltage signal. This signal should be in the order of 1kV-5kV with a frequency of around 10MHz. Can anyone help me with this? I'm not an electronic expert. I only have to apply the electric field, please note that I do not...
  5. B

    High voltage transmission line with ABCD complex equations

    Homework Statement Figure shows a 50 Hz, high-voltage, transmission line. The relationships between the sending and receiving end voltages and currents are given by the complex ABCD equations: V_S = V_R (A_1+jA_2)+I_R (B_1+jB_2) I_S = V_R(C_1+jC_2)+I_R(D_1+jD_2) where 'S' stands...
  6. E

    Ferrofluid in High Voltage AC Source

    What will happen in a ferrofluid in an elastic cylindrical tank when subjected to high voltage alternating current? Is it will expand and then back to its normal dimension periodically because of repulsion? The diagram on the attachment is the set-up, all answer will be appreciated. Thanks
  7. M

    Lightning impulse high voltage test

    Hello, I am posting this here becase this is not a homework, it;s just something I need to know. Please tell me what these two waveforms mean? I know that they're both lightning impulse waveform but what is the difference between those two, what gives them their shapes?
  8. Newtons Apple

    High Voltage or High Amperage ?

    Hey everyone, I wish to spark no heated debate, but is it possible, to have a flow of electriciy with a high voltage amount but at low amps? Or vice versa, low voltage but very high amps? What would need such dis-proportioned measurements? And finally, which would be more deadly. Is...
  9. EVriderDK

    Drawing schematics on high voltage components, like transformers etc.

    I know of multisim, but that is mostly fo rlow voltage applications. I need a schematics program like multisim, that has models of big transformer stations, current transformers, fuses, circuit breakers etc. Anyone of you who knows of a tool like this?
  10. D

    Low voltage op amp to control high voltage series pass transistor

    I am in the middle of designing a low drift and low ripple power supply for myself. To control the output voltage, which ranges from 0 to 20V, I am using an op amp whose output is fed into a Darlington pair of power bjts. The output of the Darlington pair is both fed back to the op amp's...
  11. I

    Handling high voltage sources?

    Don't know which sub-forum this topic belongs to so I'm sticking it in here. I'm currently at a temp job testing hot melt machines that powers from a 240v 3 phase source. Electrical safety was never really emphasized in engineering school. Is there a standard list of safety protocols or 'do...
  12. D

    Understanding the Basics of d-axis and q-axis Currents in Alternators

    A HVDC connection in a transmission network may reduce the system effective inertia due to the decoupling of mechanical and electrical systems. Could someone please tell me what does the above sentence suggest?
  13. E

    High voltage, where is the power?

    If I transmit 1000VAC at 1 amp, I can use a small 14 gauge wire with no issues, transferring 1000watts with little line loss. If I transmit 1000Amps at 1 volt, I better use a large cable to move all those electrons, and will still have a large loss. Ok, good with that...sort of...
  14. psparky

    How does grounded high voltage return to electric company?

    Let's talk about 3 phase feeders (NO neutral) on a aluminum ladder in a factory. When grounded properly...when hot wire touches ladder...we pop the breaker. A live cut high voltage line on the ground is another good example...how does it return to the generator at the electric company? I'll...
  15. A

    Can a high voltage across a chamber ionize a gas?

    Can a high voltage across a chamber ionize a gas? This is for an experiment...thanks guys...
  16. K

    Need help, Series RLC resonance circuit, not getting high voltage

    Hi all. I am currently building a series RLC circuit as a magnetic field transmitter. Because I want to have a strong magnetic field, I need high voltage by making the circuit at resonance. Here are the parameter I used: L:1.15mH R: 50 (internal resistance from functional generator )+...
  17. Q

    High voltage distribution to reduce power loss

    Homework Statement In Australia, New South Wale's final year of high school, a common question is asking something like: How does distributing electricity at high voltages reduce power loss in the transmission lines.Homework Equations P = VI = (I^2)R = (V^2)/R. Not very clear without...
  18. H

    Interesting video on high voltage in a capacitor

    Dear all, Could someone help me understand what is happening in this video... Does it have any application in science or industry? Many thanks,
  19. J

    Basics question of Inductor to powering high voltage lamp

    I was trying to study the inductor role in Flyback converters and all, they seem to rely on the principle that the inductor is first energized while the switch is closed and then, it acts as a voltage source itself when the switch is opened. All that is good, but I am confused with the...
  20. E

    Bonding High Voltage Source with Low Voltage Source(s)

    I'm trying to get a better understanding on how grounding, bonding, and earthing works when high voltage sources interact with lower ones. For example, if you have a 400V AC, 20V AC, and 5V DC source all stored in the same aluminum cabinet (surrounded by a faraday's cage and connected to earth)...
  21. R

    Can anyone provide data on the CY20F high voltage diode?

    Hello. I search, unsuccesfully, the datasheet for this component which is 20 kV diode. If someone has any data about it ...
  22. S

    Can't have high voltage function generator. What about low voltage Tesla coil?

    According to many knowledgeable people on the internet, an affordable "high" voltage function generator does not exist. I would have liked to have had electrodes operating at >50v with frequencies up to 15 Mhz but it seems such a function generator is out of my reach. So I want to know if a...
  23. A

    Three terminal high voltage zener diode

    Good day all, I am looking for a three terminal (zener based) shunt regulator IC that can handle at least 125V. If anyone knows where I can find it please post the url so that i can check the specs. Thank you
  24. D

    Can an SCR handle high voltage?

    I'm looking on digikey for an SCR and there is a parameter that concerns me: Voltage - On State (Vtm) (Max) It seems the maximum voltage rating for this parameter is 3.7V. I must be misunderstanding what this parameter means. Is there somewhere I could look up what it means? I plan to run a...
  25. A

    Electric current - High voltage power lines buzzing

    Electric current -- High voltage power lines buzzing Question: High voltage power lines string along roads often give off a faint buzzing sound. Use what you know about the motor principle to explain the source buzzing. ok, so i have no idea how to approach this. I've never heard...
  26. B

    Flexible material suitable for high voltage (≥70kV) insulation

    I am hoping for some advice on materials to be used for insulating up to 70kV. I am doing some preliminary research for an application in the aviation industry, however I am not an engineer and need some guidance. I have looked at mica sheet, although to insulate against such high voltages it...
  27. T

    Static electricity and high voltage?

    I was just wondering how static electricity has a high voltage. Is it because of the difference of charge between the two objects e.g you and the ground? Or is it due to the electric field which surrounds an static charged object, so the electric field cause ions to build in the air allowing...
  28. I

    Designing Shielding Box for High Voltage Cylinder

    i have to design one shielding box. in that there is cylinder having high voltage +60kev. and box having metal plate. so i have to calculate the electric field on that cylinder and then decide , what should be the distance in between plate and cylinder. i have attach the geometry on the file...
  29. T

    Why Dissipation is Minimized in Power Line Transmission through High Voltage

    So, power lines are designed to deliver power at extremely high voltage to minimize energy dissipation. This was presented in lecture by the fact that I=PV, so for a given power high V => low I, and since (I^2)R represents the energy dissipation, this term will be minimized. That makes sense...
  30. B

    High Voltage Salvage: Extracting Safely from Old CRT Monitor

    I need a high voltage system (Why you ask! Just for that I am not telling you why!). The potential gold mine that I found in my basement is... an old CRT monitor! Great! Will I and if so how will I be able to extract a high voltage system from it SAFELY. It is very old so I may need to replace...
  31. O

    Which high voltage is more dangerous: AC, or DC, and why?

    I wish I had a plot of voltage on the X-axis and danger level on the Y-axis for AC and DC. I was talking to an engineer at work, he was telling me that DC is more dangerous at high voltage. I said I disagreed with him but did not do into detail as to why I thought so. I did say that I've...
  32. R

    High Voltage Shielding: Choosing the Right Coaxial Cable for 6 kV Applications

    hello. I need to use a "coaxial" câble with 6 kV on axial wire. May I use a TV coaxial wire ? Will it be able to support such voltage. Anyway I must transport this HV and it must be shielded. A suggestion ?
  33. C

    Building a high voltage Film Cap, but its failing across the board

    new to this project and have limited knowledge, but the failure is consistent thru all specimens so I am hoping someone could shed some light. Film cap design is rated to 1650v Failure- Cap initially failed around 800v consistently, the curing time was adjusted and a ramping cycle was...
  34. T

    How does voltage affect current in a circuit?

    How do you get a high voltage, low current? This is where I am getting confused. I was under the impression, that the more charge you have on an object the bigger the electric field, being produced, so the bigger voltage. As a charge is carried by either and electron or proton, the more...
  35. G

    High Voltage A-synchronous Buck Converter (100V -> 28V)

    Hi guys, I'm new in here and hope I could get some advices. I am designing a 100V-28V DC-DC Buck converter (as per tittle) and has successfully tested on breadboard. The problem is when I've transferred everything to the stripboard, the circuit does not work. This is confusing to me...
  36. J

    Need help finding high voltage transformer

    I am trying to find a high voltage transformer with the configuration shown below. The guy that took the picture says that it is an x-ray transformer that he modified slightly, but after all my searching, I can't find a transformer like it. Has anyone seen this type of transformer or know...
  37. M

    Why Does DC High Voltage Test Generate Negative Voltage?

    Hi every body I've some question that need to be answered WHy DC high voltage test devices always generate negative voltage rather than positive voltage I hope that i can get an answer Thanks
  38. S

    High voltage but low current how?

    high voltage but low current...how?? we know that the potential difference between two points is the driving force for current , so in this sense more the potential difference or voltage between two points more is the current... but a transformer produces either very high voltage but low...
  39. O

    What charges on high voltage circuits?

    People usually use an electrostatic voltmeter for direct measurement. I would like to know what kind of charges is on following high voltage circuits. Will it be positive or negative charges? Does anyone have any suggestions? Thanks in advance for any suggestions
  40. R

    Efficient High Voltage Smoothing for Negative Power Supplies - Tips & Tricks"

    Hi. I've built a (3 in fact) negative HV power supply continuouly adjustable from 0 to - 8 kV. It uses a CCFL inverter followed by a voltage multiplier and a regulation loop. In order to eliminate regulation peaks I would like to smooth final voltage by using a 10 nF / 15 kV cap (connected to...
  41. S

    High voltage supercapacitor is possible?

    Energy density of supercap is equal to square of it`s voltage. Is it possible to join together advantages of supercaps and high voltage capacitors such as Ferroelectric caps? What prevents to use high-k materials in supercaps?
  42. N

    High Voltage Unipolar Sine Wave

    Hello! I'm trying to generate a low power, high voltage sine wave that is unipolar (so, peak to peak ranges from 0V to 300V). Ideally, I would like the ability to vary the frequency from 10Hz to 60Hz. Is there an ideal method of doing this? With lower voltage I would generate my sine...
  43. R

    Protecting LM324 from High Voltage Sparks

    Hello. I use an OpAmp LM324 as follower behind a voltage divider connected to a high voltage in the 8 kV. That works, but in some cases a spark can occur between this HV and ground and in that case systematically the LM324 is destroyed (distance between spark place and AmpOp is about 4" and...
  44. R

    Very High Voltage potentiometer

    Hello. I need 3 adjustable HV power supplies (0-10 kV). I built one and as currents needed by the 2 others are very low (in the order of 1 µA). I try to avoid building PS #2 & #3. That means that I'm looking for a device which looks like a kind of HV potentiometer but of course which is not one...
  45. R

    High voltage high amperage supply

    Hello there i have an idea i want to try to build and i want to see what you think. I want to build a tesla coil that instead of making high voltage low amperage switch the coil sizes around so i have something that makes high amperage and low voltage say about 300-500 amps. Then i...
  46. S

    High Voltage Pulsating DC supply

    Hi My introduction to Electrical Engineering is Like one hundredth of a starter But I am here to have some Help I want to Design a Pulsating DC power supply of 1K or more with micro or Nano Time constant I will highly Appreciate any kind of help and Guidance and also want to ask is...
  47. J

    High Voltage Low current from a step up transformer

    Hi, From what I have read, if a bulb X is connected to the input voltage of a step-up transformer, and another similar bulb Y is connected to the output voltage (secondary coil), then Y will be brighter than X. From Joule's law of P = V I, it seems that the output voltage will be higher...
  48. M

    High voltage power transmission and joule's law

    Hi, Power transmission over long distances from power plants to local power grids is often done over DC with relatively high voltages/tensions. The argument for this is that since, by Joule's law, power dissipation due to heat by a resistive element is given by I^2 * R, lowering the current...
  49. R

    Electret High Voltage Conversion Issue

    Using a neon 15kv transformer rectified (NTE5342@ 40 amps) to dc at the transformer input, I don't want to rectify the high voltage ac to dc at the output (cost factor and lack of knowledge to do so), the 20 amp house breaker pops after a few seconds without a load on the transformer. Is this...
  50. A

    Why does high voltage transmission reduce Joule losses?

    I'm a bit confused about why power is transmitted at high voltage for transmission over long distances. This is generally explained as reducing Joule losses, P = I^2 R, and we minimize the current by maximizing the voltage. However, a trivial re-arrangement using Ohm's law gives also P = V^2...
Back
Top