Generator Overvoltage Relay (59 G
 

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[U][F**T=&quot]Generator Overvoltage Relay (59 G)[/F**T][/U]


[B]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.[/B]



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[U][F**T=Impact]

Data for setting calculati**[/F**T][/U]
[B][I]Generator Voltage------------------------------------19000 V[/I][/B]
[B][I]VT turns ratio ----------------------------------------19000 / 100 V = 190[/I][/B]
[B][I]The max. permissible voltage for c**tinuous load operati** --- 105 %[/I][/B]
[B][I]The max. permissible voltage for no-load operati** -------------- 110 %[/I][/B]
[B][I]The max. permissible transient overvoltage ------------------------ 120 %[/I][/B]

[U][F**T=Impact]

Relay Setting[/F**T][/U]
[U][F**T=Impact]
1- Setting C**diti**s[/F**T][/U]
[B]The trip pickup is intended for moderate overvoltage of l**g durati**.[/B]
[B]Pickup < The max. Permissible transient overvoltage .[/B]
[B] = 19000 / 190 * 1.20 [/B]
[B] = 120 V[/B]
[U][F**T=Impact]2- Settings[/F**T][/U]
[CENTER][CENTER][B][I]Channel[/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I]Pickup[/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I]Delay[/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I]Functi**[/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]#1[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]106 %[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]2.5 Sec.[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][U]Alarm[/U][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]#2[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]110 %[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]40 Sec.[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][U]Trip[/U][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]#3[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]120 %[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][F**T=&quot]3 Sec.[/F**T][/I][/B][/CENTER][/CENTER]
[CENTER][CENTER][B][I][U]Trip[/U][/I][/B][/CENTER][/CENTER]





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