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Busbar, Congratulations and keep up the good work. Your helpful and illuminating posts are a source of learning for many of us.

Any ideas on reducing noise from a 230/115 kv transformer without reducing operating voltage? The noise occurs when the transformer operates at 107% nominal voltage.

In a transient stability study I noticed that induction motors are modeled with undervoltage protection. The model shows a voltage pick-up setting of 0.60 pu and a time delay of 30 cycles. Do these values seem right? What is the range of typical settings? Any info would be greatly appreciated...

There was an explosion of a 500/230 kv transformer in southern California last Friday. The explosion escalated to a fire through the entire substation. Sabotage is not suspected. All transformer experts out there, I would like to know what are the various causes of catastrophic transformer...

I have a 75-year old 115/69 kv transformer, which serves a load area in Northern California. My studies show that I can improve the voltage profile on the 69 kv network by changing the fixed no-load tap on the 115 kv side. This would be much cheaper than installing capacitors on the 69 kv...

There is a concern among many electric power professionals that deregulation and competition in the industry may have negative effects on power quality and reliability. I would like to invite comments on power quality, with a focus on the following issues: -What do you understand by the term...

The thermal capability of a transmission line depends on the physical characteristics of the conductor and on a complex combination of environmental parameters. Electric utilities have generally applied static (or "fixed") ratings, based on a set of conservative assumptions. Dynamic...

Any information on misoperation of power substation protection systems would be appreciated (categories and causes of misoperations, outage statistics etc.) Michael Sidiropoulos Transmission Planning - Pacificorp

The thermal capability of a transmission line depends on the physical characteristics of the conductor and on a complex combination of environmental parameters. Electric utilities have generally applied static (or "fixed") ratings, based on a set of conservative assumptions. Dynamic...