Answer / bijay

OBVIOUSLY OFF LINE UPS IS BETTER THAN ONLINE UPS,WHEN IT
COMES TO POWER SAVING.
REASON BEING IN ONLINE UPS CHARGING(FLOAT CHARGING)IS
ALWAYS CONSUMING ENERGY,EVEN IF THE BATTERY IS FULLY
CHARGED.WHEREAS IN OFFLINE UPS NO NEED OF FLOAT CHARGING IS
THERE,OFFLINE UPS REQUIRES ONLY BOOST CHARGING

Answer / rafi

Online ups - When the supply line is on the battery is
charging at the same time we are consuming power from
battery
Offline ups - When the supply line is on the battery is
charging but we are consuming power from the line, when the
line is off then only we are consuming power from battery

Answer / srij21

According to me both will draw same power depending upon
the load connecte to it.

Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

1 Answers  

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1 Kva = How many HP

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3 Answers   Bhel, Sabic,

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does magnetic interlocking take place in an induction motor ?

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Sir, I have applied for the of Assistant.engineer of NPDCL. please send me all AP TRANSCO AND JENCO solved papers of previous exams . I requested send me the papers to my id as soon as possible (rajanikanth_peddi@yahoo.co.in) (This is very urgent) Thank You,

0 Answers   APTransco,

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0 Answers   AFG, Afghan Telecom, GE, IBM, SECL, Sun Pharma, TNPL,

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could anyone suggest project title

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2 Answers  

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if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

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what is the function of a starter in a motor? explain RLC circuit.

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what is 3 phase motors

1 Answers   AXA,

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what is the difference between OSR and BUCHHOLZ relay of transformer?

1 Answers   Bhushan Power Steel,

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