Moisture, which can enter the insulation of a generator or motor winding from damp air or which can enter the winding of a transformer from wet oil, will make a surprisingly large difference in the insulation resistance. This is clearly shown by the curves of figure 2 for a Grand Coulee generator. Curve “A” was …
Magnifying transmitter – Nikola Tesla
The Colorado Springs lab possessed the largest Tesla Coil ever built, known as the “Magnifying Transmitter”. This was not identical to the classic Tesla Coil. According to accounts, Tesla managed to transmit tens of thousands of watts of power without wires using the magnifier. Tesla posted a large fence around the coil with a sign, …
Grounding on wood pole transmission structures
Preferred three-phase grounding applications on wood pole structures using grounding cluster bars are shown in figures 1 and 2. Grounding cluster bars must be positioned just below the lowest elevation of the lineman’s feet for the work zone (approximately the elevation of the phase conductors) and shall be bonded to the pole structure ground leads …
Improve power transfer with shunt capacitor banks
Shunt capacitor banks are used to an increasing extent at all voltage levels. There are a variety of reasons for this like the growing need for power transfer on existing lines while avoiding transfer of reactive power, better use of existing power systems, improving voltage stability, right-of-way and cost problems, voltage control and compensation of …
Change output voltage of transformer with taps
Most power transformers have taps on either primary or secondary windings to vary the number of turns and, thus, the output voltage. The percentage of voltage change, above or below normal, between different tap positions varies in different transformers. In oil-cooled transformers, tap leads are brought to a tap changer, located beneath the oil inside …
Scientist and inventor – Mihailo Pupin
Mihailo (Mihailo Idvorsky) Pupin was born in Idvor, Banat, October 9, 1854. Received his academic education at Columbia College, New York, and his scientific education at the universities of Cambridge, England,and Berlin, Germany. Obtained his Ph.D. degree at the University of Berlin, and returned to Columbia University in 1889, to take a position as instructor …
Tesla’s view on war
Tesla was opposed to wars in general. Nikola Tesla did devise protective measures that would prevent wars. Tesla found exceptions in some wars and some justifiable situations. Tesla envisioned that more terrible weapons were going to be developed in the future. These weapons’ destructive actions and ranges would have virtually no limit. Tesla’s solution was …
Protective Grounding Requirements
Each region shall implement procedures to ensure the adequacy of protective grounds and shall periodically review grounding practices at each facility to determine the proper size, length, and number (if parallel grounds are required) of protective grounds. Regions shall maintain and periodically update a listing of the maximum fault currents at each facility or location …
Tesla’s death, New York Times 1943
Tesla died alone in the hotel New Yorker of heart failure, some time between the evening of January 5 and the morning of January 8, 1943. Despite selling his AC electricity patents, Tesla was essentially destitute and died with significant debts. At the time of his death, Tesla had been working on some form of …
How circuit breaker trip unit works?
In addition to providing a means to open and close its contacts manually, a circuit breaker must automatically open its contacts when an overcurrent condition is sensed. The trip unit is the part of the circuit breaker that determines when the contacts will open automatically. In a thermal-magnetic circuit breaker, the trip unit includes elements …
