What is the problem, if a circuit breaker is not closing.
Answer Posted / baikunth
1. spring may not charged. control supply may missing.
breaker is not at service position.trip is activated or any
external interlock inhibiting the switching.
2. no
3. to save the breaker
4. for human safety.
| Is This Answer Correct ? | 27 Yes | 4 No |
Post New Answer View All Answers
I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.
What is The Resistance Formula
What is tranformer differtial?
full form of flry b
How will you utilise electrical power? You can start from the generating station.
PLEASE TELL ME ABOUT QUESTION PAPER OF UPCL ENTERENCE EXAM.
When we giving the 3 phase supply to ups system how to coming netural?
Why are lt windings placed near the core?
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?
What is Long rod insulator and it's applications..? merits over the disc insulator ..?
Why is ignitor used in sodium vapour lamp
What is inductance?
Mention the disadvantages of low power factor?
control & auxilary circuits used for circuir breakers
what is value of Jin transformer