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 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...
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...
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...
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...
Hi all,
The powerplant I'm working with want's to integrate an Electrical Committee which has the role of review/ audit any major change or issues that may present on the electrical grid. The committee shall consist majorly of internal plant technicians/ engineers and might require external...
Hi all,
Our Powerplant is currently in the preliminary construction phase of a new Reciprocating Engine powerplant consisting of 6x17 MW engines.
This new powerplant totaling 102MW will be tied to our 60 kV system by three 50 MVA step-up transformers. The idea is currently to seek the...
Dear all,
Currently, there is a dispute about what colors should be standard for breaker status colors (panel LEDs, HMI, etc.).
Does anyone have any thoughts on this or have had experienced on such matter in the past? A reference to a standard such as IEC, IEEE or ANSI might be helpful as well...
Hi all,
This post may be somewhat of the topic from a technical perspective. The powerplant I'm working with want's to integrate an Electrical committee which has the role of review or audit any change request or issues that may present on the generation side of the grid now and in the future...
Dear all,
In a recent '2x500kW Battery Energy Storage project', we have been advised by the manufacturer to install two (2) 'Three Phase Dry Type Drive Isolation Transformer' of which nameplate can be seen below. The project is now commissioned, however, since a few days ago the Transformer is...
Dear all,
Consider the configuration below. The protection scheme consists of a RET615 protection relay with included overcurrent and differential protection for the Transformer. The CT's on the secondary side of the Transformer is still pending to be installed, however, there is not much space...
Hi all,
We are currently installing 4 new station transformer of 1600 kVA each as indicated on the nameplate below. As per the wiring diagram the transformer is provided with contacts for the following:
Thermometer (26Q)
Liquid level (71)
Pressure-Vacuum gauge (63V)
The Transformers are...
Hi all,
We are currently building a Flywheel system of about 5 MW which is planned to be connected on an existing power plant switch-gear (12.6 kV). This switch-gear also feeds other auxilary sections of the power plant.
The new installation will be equipped with a new ground grid and includes...
