Georgios Konstantinou Profile picture
Aug 27, 2019 7 tweets 3 min read Read on X
OK, most of the following is textbook stuff on #HVDC but just a quick reference for what a "low-voltage metallic return" - the faulty part of #Basslink - is used.
Basslink is a monopolar HVDC system and the original design was based on an earth return. This is quite typical of monopolar #HVDC systems as it reduces cost (requires only one cable) and losses (again because of one cable)

ptd.siemens.de/IEE_HVDC_0306.…
The reasons #Basslink was eventually designed with a metallic return were mostly environmental (see link above) to avoid

"- Corrosion of long metallic structures
- Electrolysis effects of sea electrodes
- Electric and magnetic field effects"
Some other reasons to choose a metallic return might by concerns over interference, particularly to nearby communications line (These is a metric called Telephone Interference Factor - TIF) exactly for that, and railway interferences.
Drawbacks of the metallic return option in the system:
- Cost
- Losses
- Voltage drop - this translates to different transformer requirements, and
- Outages
Without having additional information - hopefully these will be made available later - besides repairs in the cable itself would be anything related to overvoltage protection - e.g. surge arresters, fuses, any spark gaps that are present that #converter station
This would be because faults in the metallic return can create overvoltages. Usually there are protections at the ends exactly for that reason

Figure is only for reference - from the #UHVDC transmission systems textbook

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More from @GeoKonstantinou

Jan 13, 2023
Back in 2019, we finished an UG project creating a timeline of #HVDC projects 🌎🌍🌏 and also added the what was then the newly proposed 🇦🇺🇸🇬 #suncable project.

This just looked at one aspect (the most technically challenging of all ⁉️) the undersea cable.

1/x
I also wrote a (very short) article for the #VSC #HVDC newsletter that @OfficialUoM Prof. Mike Barnes was editing on the news coming out of Australia

Here are some figures that might help put the #suncable project in context.

2/x Image
*These are from 2020 when the project was the Australia - Singapore Power Link (ASPL) and part of Yihong Li's UG thesis @eetunsw

1. Cable Length vs Capacity. The 2 🟢at ~1400MW are the ~700km, 515kV & 525 kV 🇬🇧🇩🇰& 🇬🇧🇳🇴projects commonly used as comparison

3/x Image
Read 11 tweets
Aug 21, 2019
Reading through @OtherProfGreen summary of the 9th August #UK event, the similarities to the 25th August 2018 #Australian separation event across the #NEM are very interesting to observe.
Firstly, they are all attributed to lightning strikes.

And although the #UK one was easy to identify, the #QLD one took a bit of forensic investigation as it happened at a time that no weather warnings were out for the area.
Both events attribute an initial loss of generation due to disconnection of #distributed #generation #DG

I will get back to this point later, because it is probably the most interesting aspect of both events!!
Read 11 tweets

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