Electrical Engineering Stack Exchange
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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.

High-voltage, direct current (HVDC) electric power transmission systems use direct current for the bulk transmission of electrical power instead of the more commonly used alternating current. Characteristics of this method of energy transmission include lower electrical losses for long-distance transmission schemes and diminished cable capacitance for underwater or underground links.

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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, my guess is that it might be either some sort of…
nanofarad
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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 with ADC's and transmitter. This board uses a…
Enrico
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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 1000VDC without additional power supply and with minimum…
Nikolay
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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 (the video shows how seven lines evaporate, then one…
sharptooth
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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 the green one, although if there are living…
Samuele Benito Di Gioia
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Are Newfoundland's and Quebec's power grid synchronized

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 Newfoundland and Labrador synchronized with the Hydro-Quebec…
Yitzhak Melamed
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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 (precharge) relay on the PCB and one of the accumulator…
Max
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Why DC is not used for long distance voltage transmission? (Tesla vs Edison 2015)

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 our current technology we could step up and and…
3.1415926535897932384626433832
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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 that in a typical SMPS design, the AC input is first…
Standard Sandun
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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 a distance to the electrode and the source is…
rohulla
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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 use so-called IGBT valves, which is multiple devices…
Cezar Chirila
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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 potential ? A work associate did a HVDC supply in a…
Autistic
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What transistors are used in DC-AC part of HVDC?

I know that thyristors are used for rectification, that results in choppy DC. But what about other side of line? How do they convert such high voltage back to AC? Highest voltage IGBT I found is 6.5kV. Do they connect them in series to achieve…
Ri Di
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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 insulators on the towers. The size of the tower is…
Jl137
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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 parallel and at then end is just some sort of…
raditya arrizki
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