In a distribution system,having 3phases & 1 nuetral.ecah phase to neutral is 230V,line-line voltage is 440V,but what is the voltage of each line.but it should obey the KVL law.

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what are the advantage and dis-advantage of 3 phase 4 wire energy meter?

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How amny AH battery required for 600va inverter ?And how many hours it will give backup for ceiling fan ?

3 Answers   HCL,

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Why fuse is? What will prevent by fuse?

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what are the current specifications of bus ducts ? i ve seen in IPBD bth 22000 A and 1500 A in 400 kv switchyard . why it is so??

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what are the types of cables?

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Hi, i want to know is meant by power quality? How it can calculated ? How we can improve?

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Explain what is clipper and clamper circuits?

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in our transmisison sub station why we step down firstly 132kv\33kv then 33kv to 11kv. can we direct step down 132kv to 11kv.

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How to know the back up time for a 5KVA UPS which is connected to 15 nos. of computers? Is there any formula for this? pls. tell me.

1 Answers   HAL,

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase), before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

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WHAT WILL BE THE SPEED OF MOTOR IF NO.OF POLES ON STATOR ARE NOT EQUAL TO NO. OF POLES ON ROTOR.???

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