01-04-2011, 12:17 PM
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عضو فعال
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تاريخ التسجيل: Aug 2010
الدولة: Egypt
المشاركات: 68
معدل تقييم المستوى: 14
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Generator Overvoltage Relay (59 G
Generator Overvoltage Relay (59 G)
Overvoltage shouldn’t occur ** a Generator fitted with an automatic voltage regulator. Overvoltage may be caused by defective operati** of the voltage regulator under isolated operati** of the generator. The relay detects the over excitati** of generators and transformers by measuring the over voltage.
Data for setting calculati**
Generator Voltage------------------------------------19000 V
VT turns ratio ----------------------------------------19000 / 100 V = 190
The max. permissible voltage for c**tinuous load operati** --- 105 %
The max. permissible voltage for no-load operati** -------------- 110 %
The max. permissible transient overvoltage ------------------------ 120 %
Relay Setting
1- Setting C**diti**s
The trip pickup is intended for moderate overvoltage of l**g durati**.
Pickup < The max. Permissible transient overvoltage .
= 19000 / 190 * 1.20
= 120 V
2- Settings
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