Why the brushes used in dc machines are made of carbon not from other metal?

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what is the different between bus section and bus coupler

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what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

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transformer losses

1 Answers  

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While starting a high capacity motor, it takes 6 times the full load current. Why it doesn't trip relay or CB's in that network?

4 Answers  

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If connected load of Asphalt plant is 375Kw. What suitable KVA DG set is required. What is calculation formula. what extra load have to consider. in what efficiency it will work.

8 Answers   MAHINDRA,

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how to calulate short circuit current for the following: 1.cable connecting 11KV of 22KV/11KV transformer to 11Kv of 11KV/415V transformer 2.what cable size should i use.

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can i use ups power as a raw power for another ups

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How to size a transformer which will supply power to 550kW,690V motor starting with VFD?

1 Answers  

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Can any body tell me about partial discharge test, and why it is necessary and its procedure

1 Answers  

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how the B-H loop obtain under the static condition

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What are protections for dty type transformers

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