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Hello everyone: How credible is that a general blackout could be caused by a virus infecting the control system of a hidrogeneration plant with 20 electric generators? And what about electromagnetic weapons disturbing electric transmission lines? Is that possible? Regards

Dear All: I am considering to connect a 13.8/115 kV transformer to a 20 MVA Gas Turbogenerator (13.8 kV). The turbogenerator has an automatic system to regulate the reactive and active power. The questions are: 1.- Do I have to use an automatic transformer tap changer to regulate the voltage...

Hi all: I have to do a presentation for the management team about a comparison between two options for a petrochemical plant electrical feeding: 1.- To buy and to install a 40 MW, 34.5/13.8 KV XFR with its correspondent 34.5 KV transmission line (3 Kms), to feed the main substation. 2.- To...

Hi all: I am involved in the procurement of about 20.000 meters of cables to be installed in a new Oil refining Plant. The contractor that is doing the design of electric system advised us to specify the size of cables in mm2, because there are more cable suppliers that handle this unit. At...

Hi all: I work in the design of a new gas plant. Yesterday in a technical seminar, my boss proposed me to protect the grounding grid of the new plant with cathodic protection. I think it is unuseful, and not common practice. But I want to know your opinions in case that the proposal becomes in...

Hi all: I am looking for information about the main comercial current ratings of vacuum breakers for 13.8 KV (prices will be excellent too). I need to feed eight areas (3 to 6 MVA each) of a plant in 13.8 KV, but i dont want to use 1200 A breakers, that seems to be the most common rating, but...

Hi all: I am involved as electrical engineer in the designing of pump system for loading refrigerated products (PROPANE, BUTANE) to ships. This system will have a wide range of flow quantity since will be many different ships with many different capacities and flow rate limits. I am proposing a...

Hi all: I have 2 questions for a new oil plant electrical system design, about Power Quality Meters: .- How valuable is to install a permanent Power quality meter in the new plant? .- Where should this device be installed (Control rooms, main substations??) I found some tips from the web...

Hi all: I am doing a design for a 13.8 KV Substation. There are six incoming lines in 13.8 KV. Two of those incoming lines will come from 34.5/13.8 KV XRF's. Besides there are 20 outgoing lines in 13.8 KV. I want some suggestion about what kind of 34.5 KV breaker i should use: outdoor...

Hi to all! I have just received the drafts of a 3 meters high elevated substation. The details include a space from level 0 to +3meters where the cables will be run and with the bottom entrance to the switchgear. Also, the drafts show the switchgear room 3 meters high with the respective...

Hi, All: I am getting involved in a new project, for a Gas Processing Plant. The entire Plant needs 4,7 MW to operate, and according the visualization studies, this power will be supplied by two 115/13.8 KV transformers in redundant double bar (two 115 KV incoming lines). My questions: 1.- Is...

I am involved in a 20 MW Generator specification and installation project. I would want to know information about excess power dissipation resistance for generators. is it a important issue in power generator control or what?? Thanks in advance

I am checking a basic engineering for a electrical project (from 115KV to 0.48KV), and I have requested a complete information for the general single line diagram including: .- Bus bars normal capacity and SC capacity (simetric and asymetrical) .- Trasformers reactances +,- and 0. Taps values...

I am designig the electrical installation of a Gas Compression Plant, and I decided to run 13.8 KV, 4.16 KV and 480 Volts cables, in sand trenches with concrete covers. But the client wants concrete duct banks. I am compiling my arguments to defend my sand trenches decision and I can mention: -...

I am checking a New 25 MW generator specifications and I am evaluating the options for ground fault protection. This generator will be installed in parallel with two ones that are already installed (since 10 years ago). Is the Hybrid generator grounding protection the best for this fault? Do I...

This is related to the already old question-concern: What is better for a 13.8 KV/4.16KV transformer bushings: porcelain or polymer??? Regards

Hello: I am looking for information about the differences between a flow computer based on PC and a flow computer non based on PC. The answer seems to be clear, but I would like to have more opinions about advantages and disadvantages. Thanks in advance

Hi: I am involved in the acceptance and selection of a radio mobile system for a new oil productionf field (aprox 40 miles diameter of this field). Actually, I have not experience in these systems because I 've always worked with control industry and power industry. Could anyone suggest me a...

Hi: In a current mobile radios system with 2 zones repeaters (and antennas of course)located 40 miles appart one from another, there is a project to replace the old repeaters with 2 kenwood tkr 850. These repeaters will have 20 miles of influence, so it has to be installed a link. Could the...