1) What is difference b/w impedence relay and differential relay? 2) what are substations equipments? 3) what is difference b/w circuit breaker and isolator? 4)what are the types of circuit breakers? 5) which medium is mostlty used in circuit breakers and why it is used?

1 Answers   NTDC,

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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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Define norton equivalent circuit?

0 Answers  

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What is the difference between bushing and insulators.? what is the creepage distance?

4 Answers  

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The power supplied to a 50mH inductor from a 120V, 60Hz source will be

0 Answers  

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what is power factor

4 Answers  

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pls send me some question and answer for rrb railway interviw related 2010

2 Answers   CEAT, RRB,

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Why rotating machines are not allowed to run near critical speed region?

2 Answers  

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How is magnetic leakage reduced?

0 Answers  

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The temperature rise in the sys, which leads to ….. a) Increases stress& length b) increases stress but decreases length c) Decreases stress & increase length d) decrease stress & length

1 Answers   Engineers India Limited,

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What is a circuit breaker contact multiplier relay?

2 Answers  

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Where do we adjust the setting of thermal over load relay & how cal calulate.

1 Answers   Hilton,

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