Side of 35kV substation lightning protection of overhead lines
Trip, an energized 35kv bus. In 2000, a Bureau of another substation 35kv line (same side of the line arrester is not installed) as being struck by lightning several times, resulting in overlap of the circuit breaker at the 2nd breaking failure, fracture SF, explosion-proof membrane chamber action , failure resulting in a switch on the trip, an energized 35kv bus. Although there is no such lightning incidents of vital equipment to the substation transformer damage, but has to safe, reliable power to bring great destruction. 3.2 line into line before the ball outside the lightning lightning voltage amplitude is limited U50% less lightning about 2km to go through into the erection of lightning-line segments in the lightning wave propagation process, the loss due to wire resistance, wire-to-ground conductance loss, land loss and loss due to corona, lightning will cause wave attenuation and distortion. At this point the lightning current flowing through the bus arrester,. = (2U50% a nU5) z, as for the ungrounded 35kV running, so n = 1,,. = 1.41kA, namely the switch operation, the bus arresters 35kv power distribution unit can protect the equipment. But when the switch is hot standby or breaking when the lightning wave encounter open total reflection, the maximum amplitude of the voltage wave to 2U50%, will switch line-side equipment and switch fracture are under 2U50% voltage, switching equipment, fracture or blow insulation will occur wear or flashover, breakdown or flashover if one side is energized, the resulting frequency arc, damage the switch interval of equipment,
christian louboutin pas cher, but not other substation equipment damage. At this point, if a switch line side surge arresters installed, you can protect equipment from lightning strikes this interval. Because the arrester action, related equipment only to bear the residual voltage arrester, metal oxide surge arresters for its value, and only about 100kV, which is safe. 3.3 into the line, or counter attack occurred around high voltage amplitude, in the dissemination process will have an impact corona. The impact of the corona wire by increasing the number of coupled systems (1.1 to 1.5 times) and lower resistance wire wave (20% to 30%) to reduce the wave amplitude and steepness. If the installation of a side of the line arrester, lightning surge waveform at high amplitude of the first invasion, that the non-linear curve intersects with the arrester, arrester discharge action is equivalent to the substation from the transmission of an arrester at the negative lightning , the overlay makes the substation after the lightning spread of greatly reduced amplitude. 4 recommendations (1) 2km into the installation of lightning line segments into line segments can 2km range 35kV line was greatly reduced the probability of direct lightning stroke. (2) lightning trip, the breaker line side of the fracture resulting in loss of bus lightning protection equipment, it must be installed in the line side of the arrester, otherwise it will cause switch, cT and wall bushings and other equipment and cause direct damage to the 35kV bus trip . (3) 2003, the Office straight 35kV line 9 occurs due to tripping due to lightning events, but because of the surge arresters installed in the outlet side,
franklin marshall pas cher, no one on the substation equipment damage. The same period in other parts of Zhejiang Province in 2003,
franklin marshall paris, still have several lines were struck by lightning causing damage to the substation substation equipment accident. Visible, arrester protective effect is very obvious. Summary overview of thunderstorm days in many areas, the outlet side of the line 35kv substation installation of surge arresters, investment, and can only receive a larger benefit. References: [1] National Power Corporation and Transmission Operations. Power production technologies used guidance documents and standards (over-voltage and insulation coordination, grounding devices) [M]. Beijing: China Electric Power Press, 2003. [2] solution Guangrun. Over-voltage electric power system [M]. Beijing: China Water Power Press. 2O02 Received date :2004 -10-09 Author: Chen column (1968 A), male, Zhejiang Cangnan, engineers. Master in technologies such as network equipment maintenance management. * Information on the country's largest power group in the cascade hydropower stations reported the formation of the Yellow River, with the Gongboxia two units of the grid,
birkenstock paris, the Yellow River water resources development springing up, showing a strong development momentum. Currently, the Yellow River have been built nine large and medium hydropower stations, has become China's largest group of cascade hydropower stations. Currently the Yellow River has been completed a total of nine of the cascade hydropower stations, installed capacity of 6.17 million kW; under construction and preparation of the hydroelectric power station l4, with a total installed capacity of 8.91 million kw. Has been built, under construction to build these cascade hydropower stations can be developed about the Yellow River basin total 5l%. It is reported that, according to the Yellow River's water master plan and the current pace of development, to achieve power generation capacity by 2010 will be 10 million kW, will be basically completed by 2020, the Yellow River resources development tasks.
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