During he starting up of the motor, the upstream's MCCB (350A) always trips due to the UVT relay activated. Can Star-delta starter use for a 20kW Motor (For a powder mixer machine) cause voltage-dip in the supply line voltage? If so, what are the recommended solution to eliminate/reduce the transient voltage dip in the line voltage?

4 Answers  

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Why we specify TNC switch with 1NO 1NC ,2NO 2NC ? how we get connection.?

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What are the causes of unbalanced current on 34.5kv feeder Ia=0.05,Ib= 0.25, Ic=0.15 and In=0.27 prior to tripping current are balance?

0 Answers  

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For some transformers we are using solid neutral earthing while some others we are using resistance earthing why ?

0 Answers  

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Distinguish between shunt and series field coil constructions.

2 Answers   BEL,

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How to calculate the heat load for a electrical room

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Dry type transformers

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For 7.5kw star delta starter how to calculate 1. Mccb rating 2. Contactor rating 3. Over load relay rating

1 Answers   L&T, MAHINDRA,

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Could you measure voltage in series?

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What is meant by pilot exciter and its working?

2 Answers  

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Which of the following can be operated at higher frequencies ? -SCR -MOSFET -IGBT

4 Answers  

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What is the importance of RESONANCE

2 Answers  

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