Recent content by Jpascp

According NESO (UK TSO): NESO will submit an initial report to the Secretary of State and Ofgem within 6 weeks, with an initial assessment of the data available at this stage of the review. NESO will provide a final report to the Secretary of State and Ofgem by end of June 2025, which will...

Does anyone has experience in EHV/UHV GIS expansion? Without any equipped spare available in existing one. From old models to new models? From SF6 to SF& FREE? References?

I saw something in youtube and prepared some photos. Link for youtube is inside file.

As per ETAP simulations is possible to improve PF with VFD.

Any idea that what could happeded? Harmonics issue? No fire resistant concrete walls between power transformers? Sprinkler system was not operational? No redundancy? Others?

We do not use any copper inside as foundation reinforcement electrode. Normally is used galvanized steel plate since is cheaper as shown in photos. Nowadays in industrial projects is normally also to connect buried main earthing grid to reinforcement foundations. In this way the total impedance...

Attached file with some photos of buried earthing grid inside concrete foundations.

For a FEED stage do you know which are the minimum deliverables documents (written, drawings and calculations) needed? Is there any standard/rule for it?

Do you usually use in electrical installations extra loop for MV Cables in origin/from and destination/to? I believe that is a good solution in case of an event short circuit at its terminals.

Thanks. Can you show that nameplate?

Yes, main question is if there are any tolerance by IEC or IEEE. If there are any tolerance nominal values MUST be followed.

Hello I have checked with one Vendor and they send me part of tests report and is mentioned values a little bigger than nominal (Ik3" and Ip) ans well related with duration of short circuit in seconds. However in nameplate will be the mominal values (for example Ik3"= 40 kA (3 sec), Ip= 100 kA).

I was checking IEC 62271-200 and I did not find anything about short circuit tolerances. For example SIEMENS MV Switchgear 8DA10 (40,5 kV/2500 A) model has 40 kA (3 sec). For some project we get IK3"= 40,66 kA. What is your experience about it?

Thanks for your support. Yes in general in SMPs we use VSCs type SVCs or STATCOMs. I have never seen any SC in it. It seems that for grid upgrades yes it is used SCs or H-SCs. I did not find any thing in internet about H-SCs for SMPs.

Do you have any data of it? SLD? Some inputs were gave to me that when EAF is working could cause some vibrations in SCs shafts. What I red until now is that 3 VSCs systems: only STATCOM only SC Both SC + STATCOM Are often used in grid voltage stability, mainly in primary substations. For...