للتسجيل اضغط هـنـا
#1
|
||||
|
||||
Generator over Fluxing Relay (24G
-The relay measures the ratio of voltage to frequency (V/Hz) as this ratio is proporti**al to the flux-density level of the electromagnetic machine. -Over Fluxing (Over Excitati**) may be occur when a Generator is ** an isolated operati** with the AVR in service and the generator speed decreasing from the synchr**ous speed. -Over Fluxing may also be occurring when the utility system frequency decreases to a low value by any reas**. There are two sets of the V/Hz relays are provided for Generator Protecti**:- A) Relay 24G (#2) for alarm A definite time element #2 of the relay will be used to provide an alarm. Operati** of the relay 24G will trip the switchyard breaker. An inverse time element of the relay will be used to provide a trip c**tact and a definite time element #1 is also used to further shape the protecti** curves. Short-time V/Hz withstand level at full load -----120% C**tinuous V/Hz withstand level at full load-----105% AVR V/Hz limiter setting -----------------------------105% Setting of generator V/Hz alarm relay 24G (#2) 1)V/Hz alarm setting Setting < c**tinuous V/Hz withstand level at full load = 105 % 2)V/Hz alarm delay Setting = 30 cycles (0.6 Sec.) Setting of generator V/Hz alarm relay 24G (INV) 1) V/Hz trip setting for inverse time element Setting = 107 % 2) V/Hz Reset rate for inverse time element Reset rate = Practical recommendati** is minimum setpoint of the relay Setting = 1 Sec. NOTE!! “If the generator is synchr**ized immediately after tripping by V/Hz relay operati**, the generator will be damaged under V/Hz c**diti** before limitati** value. “ 1)V/Hz alarm setting Setting < short V/Hz withstand level at full load = 120 % 2)V/Hz alarm delay Setting = 50 cycles (1 Sec.)
شارك إعجابك بالموضوع --»
__________________
|
#2
|
|||
|
|||
مشكور على المعلومات
|
العلامات المرجعية |
الكلمات الدلالية (Tags) |
(24g, fluxing, generator, relay |
أدوات الموضوع | |
انواع عرض الموضوع | |
|
|
المواضيع المتشابهه | ||||
الموضوع | كاتب الموضوع | الأقسام الرئيسية | مشاركات | المشاركة الاخيرة |
رلي حماية المولدة جنرال 489 Generator Management Relay INSTRUCTI** MANUAL | qjjiijiqjiij | قسم الوقاية الكهربية | 3 | 03-24-2022 11:19 AM |
Relay-to-relay digital logic communicati** | qjjiijiqjiij | قسم الوقاية الكهربية | 0 | 09-15-2014 12:02 PM |
Generator Loss of Excitati** Relay (40G). | Khaled Hamza | توليد الطاقه الكهربية والتحكم بها | 1 | 08-12-2011 06:12 AM |
Generator Stator Earth Fault Relay . | Khaled Hamza | توليد الطاقه الكهربية والتحكم بها | 2 | 08-12-2011 06:06 AM |
Generator Overvoltage Relay (59 G | Khaled Hamza | قسم الوقاية الكهربية | 1 | 08-08-2011 07:30 PM |