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 Wysłany: Czw 7:39, 06 Sty 2011 Temat postu: timberland boots Ertan Hydropower Station Generato |
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Ertan Hydropower Station Generator - Transformer Protection System Design Review of tender
Reliability. In other words, using a broken latch, the latch means which constitute the principle not to mention the existence of this or that shortcoming to the whole, the set of differential protection terminal complex. While the basic elimination of the CT break caused by malfunction of the possibility of differential protection, but at a cost of action is to reduce the reliability of the protection. Compare the pros and cons, it is easy to understand, for large generators and transformers, because of its expensive and difficult to repair. So, for their protection, especially the main protection device, preferring to let a false trip,[link widoczny dla zalogowanych], but will not refuse to move their time. This means that the protection of critical equipment when a large and reliable operation of the device with the correct operation of the two come into conflict, we should emphasize the former. On the other hand, for CT differential protection break leaving the probability is very low, in the absence of simple connection schemes closed the case, not worth the reduced protection in order to achieve a reliable locking action of the. According to historical records. Such a big power like the Northeast each year an average of a set of differential protection CT disconnection, therefore,[link widoczny dla zalogowanych], specific to each generator, each cross-pressure device, then I am afraid to encounter a thousand years before. Ertan Hydropower Station some of the actual situation is even more special,[link widoczny dla zalogowanych], CT secondary side rated at 1 amp, cable set surface is 4ram and above. As long as improve the construction quality, CT to basically eliminate the factors that break. In addition, large capacity Ertan power plant units, CT first cases of current up to 20 kA. When the break occurs when the secondary will have a very high peak voltage, the equipment and staff are a tremendous threat. And because of increased magnetic flux density polyethylene, the core loss increased significantly, will not allow the heat generated, both core and coil overheating risk of damage, will also be a residual magnetism in the core of the transformer error to increase production. Therefore, to ensure that equipment and personal safety. When CT disconnected, immediately stop inspection and necessary repair, and then look at the situation abroad. Basically do not have to do anything to prevent the CT break differential protection. Wrong jump, reasons. Nothing more than one hand there is no perfect way. On the other hand the possibility of this happening is very small, there is little risk. Given the above factors, the Ertan power station does not consider CT break blocking differential protection. ● a 94 for a five, mechanical protection means we are down in the tender will be made hydro mechanical protection of a unified group to consider. Requirements of mechanical failure unit projects are bearing down temperature. Governor hydraulic pressure tank is too low, vibration and so on. For these incidents, the previous practice of our trip were immediately shut down. However, the analysis, this approach is not the best. Because the occurrence of such incidents are generally unit running at full capacity even under overload at this time if the trip immediately, you must bring the following adverse effects: (1) large units, particularly units in the system Ertan large proportion of its sudden load rejection trip will have more serious disturbance system is one of the factors system instability Park; (2) units in case of sudden heavy trip. Will lead to speed up. For ease tile temperatures,[link widoczny dla zalogowanych], vibration detrimental to such failures. In short, the way trip to port legislation. Not help to resolve these mechanical failure. To the system and the unit itself will be adversely affected. This. We have taken the Ertan power plant units the following way: When the unit of mechanical accident, the first action in the water for the relevant guide. Load until the unit is in position, jump generator circuit breaker, thus avoiding the above-mentioned shortcomings. In fact, this approach has been widely used in foreign countries. VI Conclusion currently the largest group of Ertan hydroelectric generator with the generator protection device is through international competitive bidding for procurement, so we prepared standard process as possible to consider a comprehensive, detailed, same time so that the tender many manufacturers to adapt to the possibility of bidding, in general more difficult,[link widoczny dla zalogowanych], therefore, inevitable that there are deficiencies tender, which requires us to work in a future evaluation, contract negotiations and the process of implementation of the contract. Do more detailed work in order to obtain comprehensive and advanced hair one by one transformer unit protection devices. References: (1) \(2) \\2, April1989 (6) product samples provided by foreign businessmen. ~ 95 -
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