why anti pumping relay is not given to tripping coil of the breaker? why only to closing coil?

2 Answers   INEL, Siemens,

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what is the meaning of ceiling voltage in Generator exciter?

1 Answers  

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Hello friends, Can anyone explain the concept of zones in Bus bar protection and how can we differentiate the main zone and check zone in Bus bar protection

1 Answers   ABB, NCC,

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what is mean by PIR in circuitbreaker and give me detail of that?

0 Answers  

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how to calculate the input current in singel phase and 3phase supply to 5kva ups

1 Answers   Gravity India,

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WHAT ARE THE FACTORS REQUIRED FOR SELECTION OF TRANSFORMER RATING?

13 Answers   Tech Mahindra, Technip,

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how does a tube light choke working?

2 Answers  

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1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

0 Answers  

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What are the main parts of VCB?

12 Answers  

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how to get more than 1000 ohms between 2 earth pits ?

2 Answers   HCL,

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In three pin socket normally three pin in between three pins earthing point is more thickness why?

6 Answers  

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what is the difference between active power and reactive power and apparant power in practical as well as theoritical

0 Answers  

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