Questions tagged [hvdc]

High-voltage, direct current electric power transmission systems use direct current for the bulk transmission of electrical power instead of the more commonly used alternating current.

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Turning PNP fully off for fuse indicator

I'm having a little trouble with a PNP based blown fuse circuit. I'm using a similar circuit in other boards for blown fuse indications for 12VDC and 24VDC supplies without issue. I'm trying to ...
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What are the reasons HVDC towers are smaller than HVAC

I’ve heard its because of 3 wires in 3 phase AC instead of 2 in DC. However I would think the more important factor is that AC would have higher peak voltage than DC which would mean longer arms and ...
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High Voltage DC Motor (AC rectification) Relay, Current Limiting, and Smoothing Capacitor

Looking at controlling a HVDC motor like so - Type DC781 (2) LSG Operates on 6 - 220 VDC 84 ohm terminal - terminal resistance No load speed of 8000 RPM @ 220 VDC - 100 mA Stall current at 220 VDC: 2....
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Connecting many LEDs in series on HVDC

Is it technically possible to connect, lets say 500 2V LEDs on 1000V DC line? As far as I understand, the voltage would simply be divided in 500 for each identical LED, right? Is it safe to do that? ...
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Can a flyback transformer voltage output be multiplied by a Villard cascade?

I'm trying to keep the setup rather simple for a high voltage power supply I'm making. I'll probably use a ballast to drive the flyback as opposed to perhaps a ZVS board -- feel free to critique this ...
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Deriving equivalent impedance of circuit with pi sections

Hello everyone, I am currently trying to find the equivalent impedance of this circuit. The circuit consist of a load C1 which are connected to a two pole pi section with line inductors which are in ...
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2 votes
1 answer
67 views

Electrospray Deposition

I recently got a new project to work on, an Electrospray Deposition setup. Basically, it consists of a needle that contains a liquid, a electrode and a high voltage source. The needle is positioned at ...
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Harmonics produced by LCC converters

Considering an LCC HVDC system and that the flow of power is ALWAYS in the direction shown in the figure. I know that converters in general produce harmonics. My questions are: Does this HVDC system ...
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current path into the ground?

Considering a monopolar HVDC system, with the ground as the return path. I was wondering if the current path is physically speaking like the red one or the green one in the picture? I think it is like ...
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Reduction of the harmonic currents in LCC HVDC systems

Why there is a reduction of the harmonic currents in the AC side in an LCC HVDC system? Here is represented the AC current in yellow, in red the DC voltage and the sinusoidal waves are the AC ...
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What are the situations which can cause a resistor to permanently increase its resistance?

The resistance of a resistor in the HVDC circuit permanently increases. Is it because of voltage or some other reasons? Note that there are no short circuit cases seen in the system.
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Unstable behavior of Dc-Dc converter

I am currently working on a high voltage boost converter based on Dos4Evers 555 timer based one https://www.dos4ever.com/flyback/flyback.html (12v to 140-220V). I am running into an issue with the ...
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Can anyone explain HVDC transmission to me?

HVDC transmission system sounds strange to me because I wonder why we would need it? We have HVAC transmission system which is much more efficient and less power losses. When we use the DC for same ...
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What is this symbol that looks like a 3/4 circle connected to wires?

I am reading an application guide related to high-voltage DC and have come across a symbol that I do not recognize: The source of the schematic is this document from Siemens. Based on the context, ...
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High Voltage (0-600V) DC Voltage Sensing, Shared Ground with Isolated Converter and HV-

I'm designing a circuit to detect when the voltage across two DC input lines (HV+ and HV-) is greater than 60V. The voltage will vary from 0-600V. A seperate supply of 12v and 5v is available for use. ...
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How to change polarity at 120V DC using DPDT?

I have a strand of LED Christmas lights. Each "bulb" has two LEDs - one is color and the other is white - the polarity on the string determines which of the two LED lights up. Pressing the button ...
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Physical Limits on HVDC Voltage [closed]

Higher Voltage minimizes I^2*R losses in power lines - we have power lines up to 1 megavolt, and presumably going any higher in terms of voltage doesn't save you too much power. But say we do ...
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Does using HVDC for distance transmission make theft of electricity easier to detect?

In particular, if you were going to try to steal power from HDVC transmission lines you'd need one cable attached to current going in 1 direction and the other attached to current flowing in the ...
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High voltage pulse discharge ring dampening (how to save a pulse capacitor)

So I have a high voltage pulse circuit. I have planned it to be around 90kv with the capacitor being 1.3uF. It is to be discharged through a spark gap. Before I test it, I of course want to save the ...
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6 votes
4 answers
2k views

High voltage LED indicator 40-1000 VDC without additional power supply

I would like to make an indicator to show that DC bus (700VDC) capacitors are charged (be careful!). What is the best way to make a LED indicator, which will work for a long time from 40VDC to ...
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2 votes
2 answers
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What limits the number of MOSFETs/IGBTs in Series / Parallel

I was looking at HVDC systems out of curiosity and I have a question that I have not exactly found an answer for. In HVDC converter, because of the high voltage (Tens/Hundreds of kV) they have to ...
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High voltage to low voltage buck converter for(60V IN 5V 3A out) making noises?

I've been trying to convert a high voltage input to a lower voltage (5V at around 3A) with no luck using these Modules and all of the LM2596HV iteretions of modules out there and all seem to make ...
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Voltage Drop for Power Supply Testing

I recently bought a 10-30 kV DC, 8-10 mA power supply that I am looking to test before its incorporation. However, the retailer advised me that I should place a load on this power supply - as one ...
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3 votes
1 answer
247 views

Are Newfoundland's and Quebec's power grid synchronized [closed]

By the Maritime Link project (HVDC), which finished this year, Newfoundland is linked asynchronously to Nova Scotia, which is part of the Eastern Interconnection. But is the power grid of ...
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Switch in parallel to a hvdc load. Fail or success?

Suppose I have 600v dc as my power source to a motor. And I have a isolation relay in parallel with the motor. The motor runs when the switch is open. What happens when the switch is closed? Would ...
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High Voltage Serial-to-Parallel Over Many Channels

I've been using the HV507 for parallelization of a 300VDC supply, but the chip only has 64 channels. I was wondering how to drive this voltage to a much higher number of channels (say, 1,000). Is ...
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1 vote
1 answer
255 views

How can I protect a picoammeter or a picoscope in HVDC measurements?

I'm trying to measure the leakage current along an insulator energize with HVDC (the effect of space charges is been considered). Can I connect a picoammeter to the ground electrode? If yes, please ...
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4 votes
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940 views

Switching HV DC relay on crashes microcontroller

So I´ve designed a PCB for a Pre-/Discharge Circuit for a 400V DC system which is controlled by a STM32 microcontroller. When powered the program waits for 1s and then starts by switching the (...
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Relay to Tesla Coil [closed]

If you take apart a Relay (small, mine is out of a printer) and open it up there is a tall coil of wire. Are you able to use that coil of wire to make a HV generator or Tesla coil of a sort?
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5k views

Why does HVDC consume reactive power

So many academic papers quote the following fact: "A line commutated converter in steady-state operation inherently consumes reactive power of about 60% of the DC power transferred." I do not want to ...
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Optoisolator Long term Reliability at HVDC

Most optocouplers spend most of thier time isolating mains voltages.They are reliable doing this and they are cheap and simple.How would things go if the same garden variety opto was isolating a DC ...
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Why DC is not used for long distance voltage transmission? (Tesla vs Edison 2015) [duplicate]

It seems this question has been marked duplicate but I believe the answers given here is much more in detail. Why we are still using AC voltage for long distance voltage transmission. As we know with ...
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1 vote
2 answers
497 views

Why are thyristor stacks hung from the ceiling?

The Wikipedia article on thyristors as well as the one on valve halls mentions that thyristor stacks in HVDC applications can be hung from the ceiling or supported by insulators mounted on the floor. ...
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7 votes
6 answers
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Extract 5W low voltage power from 3000W high voltage source

I have a solarpanel array that generates 600V, 5A (3kW). I want to create a small electronic unit to measure the DC current and voltage and transmit this wireless. For this I have an electronic board ...
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3 votes
1 answer
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SMPS design, requirement of generating High Frequency

Question: Is that requirement of converting 50Hz to a higher frequency in SMPS (Switched Mode Power Supply) is just to reduce the transformer/inductor core size? Background: Since as we all know ...
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5 votes
4 answers
6k views

How does DC transmission require several times less wire than AC?

In this YouTube video (scrolled to 5:55) there's a claim that replacing an AC high voltage transmission line with a high voltage DC transmission line allows for having seven times fewer powerlines (...
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