Search results for query: *

Hi folks, A powerplant intends to extend its firm capacity with two generators requiring a step-up transformer with the below specifications. What would be the latest 'top 3' recommended manufacturers to provide such a transformer, considering factors such as lead time (~6 months) and cost...

Dear all, I'm looking into some information to prepare a refreshment presentation for our grid and powerplant operators. There may be some misunderstanding related to the operating philosophy in the normal state. e.g., when to change the power factor, when to control voltage with generator...

Hi all, In a double bus system below. The normal operation is to use only Bus-I (disconnector DS-1A, DS-2A, and DS-3A closed and DS-1B, DS-2B, and DS-3B open). While operating with load, can the disconnector of Bus-II, e.g., DS-1B be closed to open the disconnector of Bus-I, e.g., DS-1A?

Hi @dpc, Thanks for the prompt response. Indeed the project is not in the US but some NEC codes still apply here within the electrical regime. We are mostly IEC governed. It just does not seem to be a common practice to mix two voltage level conductors in the same cable bundle. In this case, it...

Hi Folks, A contractor is in discussion with a client stating that it is possible to run mixed AC voltage levels within one multi-conductor cable, e.g., a 5/Cx25mm² The system in question is a supply cable feeding a step-down transformer at 460 VAC running from a panel and stepping it down to...

Hi Bill, Thanks for the reply. Below you'll find a high-level schematic illustrating the situation. With operation philosophy, I was referring to the procedures that the operator would take to manage the OLTC operation. For example in what situation is the operator to use the OLTC? I understand...

Dear all, The power plant where I work is planning to integrate On-Load Tap Changing OLTC) Transformers onto the grid for a new power plant expansion consisting of Reciprocating engines. There will be in total 3x 50MVA, 60kV/13.8kV Transformers, which are currently not equipped with an AVR to...

Hi folks, We currently in the construction process of secondary containment basins for three 50MVA oil emersed transformers. The project developer is currently planning to fill the basin with what seems to be limestones in the basins. Can anyone recommend the type of stone that should be used...

Not completely sure about the spec sheet either. This is what they provided. I'll take a better look and see if the specs match. Nevertheless, it's a 50HZ producing Genset that they want to use to supplying 60hz equipment.

Find below additional information on the generator in question. Jairo

Hi Bill, Thanks for the great information provided. Can you provide additional information on the auto-transformer/ bridge you suggested? Kind regards, Jairo

Bill, Attached the condensing unit nameplate. https://files.engineering.com/getfile.aspx?folder=a9def721-9574-4508-8b48-1cc9d7b183b4&file=0_IMG-20200702-WA0004.jpg

Yes, only the A/C is inverter type.

Hi folks, A friend of mine got a portable 2.2kVA generator as a gift. However, the household electrical grid is 60Hz 127/220V, and hence most appliances are 60Hz. My friend wants to use the generator as a backup to supply an air condition (inverter type). What can be the consequences of...

Hi All, I'm currently updating an ETAP model and I wanted to standardize all protection relays. They are mostly IED's consisting of multifunction relays, for example, ABB RET, REF, REL, etc. What might be a suggested naming convention for these relays? Kind regards, Jairo

Hi all, We are currently in the construction phase of a new RECIP powerplant. It will also integrate a new and modernized control room, which includes a large videowall where operators can view all the necessary parameters of the powerplant. I was wondering if anyone could share a list (and...

Dear all, There's a new smokestack being constructed, and apparently the developer changed its standard design. The "old" design included that there's dedicated copper wire from the smokestack interception rod to the rod/earthing network. According to the developer, the steel structure is...

Thanks for all the great info. I found this idea online. Would angling the top (see figure below) of the wall with some wood structure or installing a strip of lattice across the top of the wall reduce the turbulence?

Dear all, I was wondering if someone might provide some thoughts on this matter and what can be done to prevent this issue. The wind blows from the East over a bigger solid wall and hits a smaller wall, blowing all the sand back into a pile against the bigger wall. Might there be a low-cost...

Dear all, We are currently discussing with a switchgear manufacturer if the arc exhaust chamber (plenum) duct on top of the switchgear should exit the substation if a possibly internal ar-flash may occur. This may be helpful to prevent arc-flash byproducts into the Substation and causing a...