There are difference between IEEE STD and IEC STD associated to power transformer rating as shown on the table below.
For a 100MVA unit with 30 degree C average ambient temperature in 24 hrs. What should be the maximum rating if specified per IEEE or the same maximum rating if designed based on...
Can someone advise if the electric energy provided by a utility company is a service or a product? There is any difference if is at the generator, transmission, or distribution side? What about the battery energy storage system either residential or utility scale application?
It is safe to use a 12.47 kV design standard for a 13.8 kV overhead distribution system considering that both are within the traditional 15 kV ANSI class
The application is for selecting overhead phase-to-phase or phase-to-ground clearances using an existing 12.47 kV design standard but at...
The NEC recommends a maximum voltage drop (VD)of a total of 5% across feeders and branch circuits, and 3% across the branch circuit alone implying 2% on the load circuit.
Since most loads can operate efficiently at 95% of the nominal nameplate voltage, what is the relevance of meeting the 3%...
We need an advice to determine if a rigid aluminum bus is adequate to be supported at one end by a disconnect switch.
We are working upgrading 230 kV substations with high short circuit of 50 kA, often the reaction in the disconnect switch pads are above to the rating allow by the ANSI/IEEE Std...
There any concern running a generator at no load or light load?
We are trying to determine if there is a minimum load on a 7MW engine generator that may impact the performance of the unit such as stability or another unwanted issue. On the other hand, we have a concern with an uneconomical...
There is a recent trend to vandalize substation and other electrical infrastructures.
The news reported several event that should concern the power industry in the US
https://apple.news/AJKgx9-2rSKeFmyxEeEuboQ
Is there a potential hazard or performance issue for a CCVT with unused carrier accessories?
I presume that a dangerous voltage can be developed on the HF terminal and possible performance issues if this terminal is not grounded.
NOTE: We did specify CVT but for other reasons, the utility...
We need your help to help with an internal discussion among the electrical discipline to estimate the loads on a rigid bus with two spans with the uniform load as shown in the sketch below. This is a model that can be idealized as a beam with a uniform distributed load (Deadweight, wind, and...
1) What commercial software is capable of modeling Baterry Energy Storage System?
2) Does SKM software has the capability to model BESS?
LIST OF CASES TO VERIFY BESS CAPABILITY
• Charging/discharging scenarios: (Independent BESS/Cogen operation, varying POI voltage to meet FERC 827.)
• Impact on...
Can anyone help to understand the above statement?
Other manufacturers do not have issues applying correction factors for variation of soil thermal resistivity, phase spacing, earth temperature, etc. for single shielding bonding or both ends grounding arrangement.
See the enclosed excerpt for...
It is allow to cross a 345 kV existing line entrance to a substation with a 138 kV line above?
The 345 kV is transitioning from a vertical arrangement in a pole to an H frame on the substation entrance. The only space free is from above the existing 345 kV line. Underground is also crowded.
This week, LIPA filed a breach-of-contract lawsuit against grid operator PSEG Long Island in an unprecedented move that puts a price tag on the NJ-based company’s "grossly negligent" performance during Tropical Storm Isaias: at least $70.
KEY CHARGES LAWSUIT ISSUES:
1) PSEG failed to properly...
We are investigating if an HVDC - Symmetrical Monopole VSC can meet the N-1reliability criterion. The concern is triggered by the issue that a fault on any of the (+) or (-) DC poles will get the system totally out. Similarly, a single AC output from the converter station does not have...
Tokyo Electric Power Company Holdings Inc. (TEPCO) came under fire from the central government, prefectural officials and local residents Friday due to its slow progress in restoring power to the grid, forcing many in Chiba Prefecture to endure a fifth day without electricity.
