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Trending 'Housefull 3' Trailer Pyar Ki Maa Ki Song - 'Housefull 3' Hamare Paas Ek Mauka Hai - 'Traffic' Promo What's Your Phobia? Electric utility companies maintain extensive monitoring equipment on their major electrical circuits. On the day of this incident, the displays showed that a device called “differential voltage relay” sensed a voltage difference between two electrical phases of the output of a specific transformer. The data to the displays in the control room also indicated a high electrical current on one of the cables connected to one of the transformer’s secondary coils. Electrical transformers have only two electrical circuits – a primary (input) and a secondary (output) – coupled together by an electromagnetic circuit to step the incoming voltage up or down. The transformer in this instance was a 100 MVA (100,000,000 Volt Ampere), three phase unit with 115,000 volts on the primary (input) and 14,000 volts on the secondary (output).
A sample of the oil from the transformer involved in this incident was sent to a chemical laboratory for analysis. The transformer was drained of oil and subjected to an internal examination using a boroscope. Engineering services in New York and North Carolina provided through the associated firm, EDT Engineers, P.C.
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The data from these monitors are collected at the utility’s control room and appear on displays that identify the locations of abnormal operation and the exact times when malfunctions occur.
For this transformer, the output (secondary) cables were routed underground from the transformer to a utility pole approximately 1000 feet (305 meters) away. For three phase supply provided by utilities, transformers have three pairs of wire coils – one pair for each phase.
The electromagnetic fields create forces tending to move the coil windings relative to one another. The analysis results indicated sharp increases relative to the pre-incident historical trends for hydrogen(H2), methane(CH4), acetylene(C2H2), and ethylene(C2H).
Turns ratio is the ratio between the voltage and the number of turns on a primary and secondary winding of the transformer. Pakistan, Iran, charity, Charities, Red Cross, Christian Children's Fund, United Way, Methodist, Episcopalian, Presbyterian, Orthodox Russian Greek, Catholic Charities, Catholicism, Baptist, Muslim, Hindu, Buddhist, Shinto, Naturalist, Atheist, Agnostic, Agnosticism, Mormon, Mormons, Temple, Church, Cathedral, Bible, Koran, Shinto, Islam, Good Samaritan, Children's Hospital, St. Determination of the cause of the electrical outage was an issue, but also of concern was the scope of damage to the electric utility’s equipment that resulted from the incident. While examining and testing the cables, utility personnel found an electrical short (a cable fault) at a riser where the underground cables came up to the surface. Under normal operating conditions, with the coils tightly wound, there is no adverse effect.
For preventive maintenance purposes, utilities routinely conduct chemical analyses of the oil in the transformer and plot the results. The increases in the presence of these gases were an indication that electrical arcing had taken place within the transformer tank.
The readings for the Phase B coil windings were significantly higher than those of the Phases A and C, indicating a problem with the Phase B coil windings.

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As a result, the voltage spike was reflected back to the transformer, explaining the high electrical current that was previously detected back in the control room.
However, under abnormal operation, such as a voltage or current surge, the electromagnetic force fields are greatly increased and can cause repeated movement between coil windings. Trends in the quantities of various gases found in the oil provide an indication of the condition of the coils inside the transformer tank. The wire comprising the coils is tightly bound together to minimize any physical movement between windings. The result is rubbing between the coil wires and a consequent decrease in the coil wire insulation quality.
As the insulation quality decreases, electrical shorts between windings occur that can escalate into a coil fault. NCP's Sharad Pawar is said to be angry with UPA for not allotting him the no.2 position in the govt!
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