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Reverse Power Relay
In case of Turbine Failure, the Turbine is tripped and then the Generator is tripped by operati** of Reverse power Relay to prevent overspending of the Turbine generator unit. 2- Protecti** against generator motoring 32G (#2). -Generator motoring protecti** is designed for the prime mover or the system, rather than for the generator. - With steam turbines, Turbines will overheat ** low steam flow, motoring results from a low input To the Ac Generator, - When This I/P can’t meet all the losses, the deficiency is supplied by absorbing real power from the system. - since field excitati** should remain the same , the same reactive power would flow as before motoring , thus, ** motoring the real power will be into the generator, while the reactive power may be either flowing out or into the generator Data for setting calculati**s -Rated Capacity of Generator -------- 440,000 KVA -No Load Loss of Generator --------- 1,785 KW -No Load Loss of Turbine ---------- 1,350 KW -No Load Loss of TG unit ---------- 3,135 KW -Permissible Motoring Time ------- 60 Sec. -Relay C**stant ------------------- 1 P.U. = Generator KVA Trip Level < No load loss of TG unit * 0.3 = 3,135 * 0.3 = 940.5 KW Pick up = Trip level / relay c**stant = 941 / 440,000 = 0.0021 P.U. Setting = - 0.002 P.U. ( 880KW ) Trip Delay < Perm. Motoring time (60 Sec.) Setting = 50 Cycles (1 Sec.) Trip Level < No load loss of TG unit * 0.5 = 3,135 * 0.5 = 1,568 KW Pick up = Trip level / relay c**stant = 1,568 / 440,000 = 0.004 P.U. Setting = - 0.004 P.U. ( 1,760KW ) 2- Reverse Power Trip Delay Trip Delay < Perm. Motoring time (60 Sec.) Setting = 750 Cycles (15 Sec
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آخر تعديل بواسطة Khaled Hamza ، 12-19-2010 الساعة 12:26 PM |
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مشكور على المعلومات
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العلامات المرجعية |
الكلمات الدلالية (Tags) |
power, relay, reverse |
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المواضيع المتشابهه | ||||
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