Answer / prabhu

Battery backup time=AH capacity of battery*Total
battery*Total load in KVA*130

Answer / balu

Time (in hour)=battery voltages * battery AH * efficiency of Inverter
/ Load(in VA)



12*150*.8/600=2.4h

Answer / kamal

( )ah=backuptime (min)*ups (vA)/BETTERY VOLTAG*QUANTITY OF
BETTREY*0.9*0.6 SO U WILL HAVE THE AH FOR THE BATTERY THAT
U HAVE TO PUT

Answer / arul

output kva /dc low
for ex;5kva,120v dc
5000/108=46ah,for 1hr approx.

Answer / chitti2babu

yes

is KVAR (not reverse power) relay necessary to protect from excitor field failure on a brushless, synchroneus generator? Some people with previos experince tell me no but the manufacturers tell me it is designed for that purpose. Is it that it is only necessary for brushless generators and not the older style with the slip rings and brushes?

1 Answers  

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we have one 75kw motor 380 volt 3ph amp134 please advise which size of cable required

2 Answers  

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What do you mean by cogeneration? What its working principle?

0 Answers  

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how is the testing of an REF relay? what are the test REF circuit having?

0 Answers   Siemens,

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300m long and 30kw inductive loade 3phase supply how many size cable required

0 Answers  

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difference between moore and mealy model

2 Answers   Google, IBM, TCS,

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How to calculate cable size for a particular load? i have 12 MW,11KV Motor 3 Phase, what should be cablesize? What are the points to remember for cable sizing calculations?

2 Answers  

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why all transformer colour is same?

3 Answers   OPTCL,

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How many types of isolator is available for H.T.lines? which one is best for sub-station?

4 Answers  

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what is difference between neutral& grounding?

6 Answers  

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if d gen is 50kw,load is 60 kw,hw d gen ll supply d remaining power?

3 Answers   NHPC,

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what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)

0 Answers  

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