منتدى الهندسة الكهربية

منتدى الهندسة الكهربية (https://www.ieees.com/)
-   قسم الوقاية الكهربية (https://www.ieees.com/f-4/)
-   -   Reverse Power Relay (https://www.ieees.com/f-4/3048/)

Khaled Hamza 12-19-2010 12:22 PM

Reverse Power Relay
 
[LEFT][U][F**T=Impact]Reverse Power Protecti**.[/F**T][/U]




[URL="http://1.bp.blogspot.com/_CZnqYQLLQtc/TQ30AS15PuI/AAAAAAAAAC8/NEIzMVVh3Ac/s1600/gene..JPG"][IMG]http://1.bp.blogspot.com/_CZnqYQLLQtc/TQ30AS15PuI/AAAAAAAAAC8/NEIzMVVh3Ac/s400/gene..JPG[/IMG][/URL]

[U][F**T=Impact]1- Protecti** against overspend 32G (# 1).[/F**T][/U]

[B][I]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.[/I][/B]
[U][F**T=Impact]
2- Protecti** against generator motoring 32G (#2).[/F**T][/U]

[B][I]-Generator motoring protecti** is designed for the prime mover or the system, rather than for the generator.[/I][/B]

[B][I]- With steam turbines, Turbines will overheat ** low steam flow, motoring results from a low input To the Ac Generator, [/I][/B]

[B][I]- When This I/P can’t meet all the losses, the deficiency is supplied by absorbing real power from the system.[/I][/B]

[B][I]- 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



[/I][/B]





[LEFT][URL="http://1.bp.blogspot.com/_CZnqYQLLQtc/TQ3zQpY29II/AAAAAAAAAC4/XnYcMTQRU30/s1600/reverse.JPG"][IMG]http://1.bp.blogspot.com/_CZnqYQLLQtc/TQ3zQpY29II/AAAAAAAAAC4/XnYcMTQRU30/s400/reverse.JPG[/IMG][/URL][/LEFT]






[U][F**T=Impact]Setting of Reverse Power Relays[/F**T][/U]
[B][I][U]Data for setting calculati**s[/U][/I][/B]
[B][I]-Rated Capacity of Generator -------- 440,000 KVA[/I][/B]
[B][I]-No Load Loss of Generator --------- 1,785 KW[/I][/B]
[B][I]-No Load Loss of Turbine ---------- 1,350 KW[/I][/B]
[B][I]-No Load Loss of TG unit ---------- 3,135 KW[/I][/B]
[B][I]-Permissible Motoring Time ------- 60 Sec.[/I][/B]
[B][I]-Relay C**stant ------------------- 1 P.U. = Generator KVA[/I][/B]


[U][F**T=Impact]Setting Of Reveres Power Relay 32G ( #1 ) [/F**T][/U]
[I][F**T=Impact]1- Reverse Power Trip Level[/F**T][/I]
[B][I]Trip Level < No load loss of TG unit * 0.3[/I][/B]
[B][I] = 3,135 * 0.3[/I][/B]
[B][I] = 940.5 KW[/I][/B]
[B][I]Pick up = Trip level / relay c**stant[/I][/B]
[B][I] = 941 / 440,000 [/I][/B]
[B][I] = 0.0021 P.U.[/I][/B]
[B][I]Setting = - 0.002 P.U. [/I][/B][B][I][U]( 880KW )[/U][/I][/B]
[I][F**T=Impact]2- Reverse Power Trip Delay[/F**T][/I]
[B][I]Trip Delay < Perm. Motoring time (60 Sec.)[/I][/B]
[B][I]Setting = 50 Cycles [/I][/B][B][I][U](1 Sec.)[/U][/I][/B]





[U][F**T=Impact]Setting Of Reveres Power Relay 32G ( #2 ) [/F**T][/U]
[I][F**T=Impact]1- Reverse Power Trip Level[/F**T][/I]
[B][I]Trip Level < No load loss of TG unit * 0.5[/I][/B]
[B][I] = 3,135 * 0.5[/I][/B]
[B][I] = 1,568 KW[/I][/B]
[B][I]Pick up = Trip level / relay c**stant[/I][/B]
[B][I] = 1,568 / 440,000 [/I][/B]
[B][I] = 0.004 P.U.[/I][/B]
[B][I]Setting = - 0.004 P.U. [/I][/B][B][I][U]( 1,760KW )[/U][/I][/B]
[I][F**T=Impact]
2- Reverse Power Trip Delay[/F**T][/I]
[B][I]Trip Delay < Perm. Motoring time (60 Sec.)[/I][/B]
[B][I]Setting = 750 Cycles [/I][/B][B][I][U](15 Sec[/U][/I][/B]
[LEFT]

[/LEFT]
[/LEFT]

bigleve2100 08-08-2011 07:35 PM

مشكور على المعلومات


الساعة الآن »06:53 AM.

Powered by vBulletin® Version 3.7.5
.Copyright ©2000 - 2024, Jelsoft Enterprises Ltd
3y vBSmart
F.T.G.Y 3.0 BY: D-sAb.NeT © 2011