what type of relays used in transformers?

24 Answers   APTransco, BSNL,

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How much energy save vfd if motor run on 50 Hz (full speed)

3 Answers   Reliance,

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how many hvdc lines in india???

0 Answers  

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how to convert single phase supply to 3 phase or 3 phase to single..?

7 Answers   Wipro,

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In VVVF drive voltage is varying in accordance with frequency.My question here is How much will be the voltage in the inverter side if the frquency is set for 10Hz ?

1 Answers  

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what is RNG in the DG synchronizing by PLC?

0 Answers  

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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???

1 Answers  

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What is double delta conection in AC Motor? And can we done the double RPM of the motor by double delta conection?

1 Answers   vguard,

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explain LED lamps?

1 Answers  

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What is the difference between PS & metering CT (5p20,0.5 etc.)? Why in PS class CT only Vk is given ? Is PS class CT is more accurate than metering CT?

0 Answers  

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What is a dc motor?

0 Answers  

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how much current in live 11 Kv distribution Line?

1 Answers   ABB,

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