what is the diffrence between dol and star delta strater? why star delta starter used instead of dol?

3 Answers  

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what is the advantages of having in-built acvvvf (without seperate inverter in the control panel)in the drive system of elevators?

0 Answers  

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what use marshalling kishock in power transformer?

2 Answers  

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What will happen if the armature resistance is in minimum position and the field resistance is in maximum position while starting the motor

0 Answers   Viva,

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can we use inductor in case of d.c.,if yes then what will happen in circuit

3 Answers   JSW,

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what is droop?

13 Answers   Alstom, Bhel,

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Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

0 Answers   Bhel,

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Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Current of Transformer

2 Answers  

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What is MSL designation of a motor and same may be provided in details.

0 Answers   DAE,

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what is formula to cal cute earth pit numbers and size of earth strip used in earthing?

0 Answers  

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How can I calculate per unit (KWH) fuel (Gas/ Diesel both) consumption 1MW unit?

0 Answers  

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What is the lifetime of a Thyristor? Is there a recommended lifetime for thyristors after which they should be replaced?

0 Answers  

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