Electrical Engineering

Questions tagged [hvdc]

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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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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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2answers
125 views

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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86 views

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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87 views

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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1k 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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2answers
232 views

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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1answer
109 views

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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2answers
65 views

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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1answer
119 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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1answer
25 views

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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125 views

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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212 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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511 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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1answer
180 views

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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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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467 views

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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2answers
379 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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2k views

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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1answer
2k views

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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4answers
5k 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 (...