Electrical Interview Questions for Relay Protection Engineering III

1. Have you also worked on Motor or generator protection or it is only transmission and distribution?
2. What different kind of relaying you have worked with?
3. Did you also work with Electromechanical relays?
4. 78% of relaying is still electromechanical.
5. Can you explain how do you order the relay from the Step 1 to commissioning?
6. What type of relay you have used for SEL?
7. What kind of protection is there for Line?
8. Ok, it is distance.
9. what is the distance protection philosophy?
10. How many zones are there?
11. Can you discuss the characteristic of the zone?
12. How can you plot it on the paper?
13. Where will be the protected line on the characteristic?
14. What angle you can see the protected line?
15. Can you discuss where will be the Remote line in this cureve?
16. Where can you see the other lines on the R-X characteristic?
17. Are you aware of line differential?
18. What is the principle for the line differential?
19. How does the differential takes place?
20. Are you aware of POTT or DUB?
21. Have you used them in your project?
22. Which software you have used for ABB, simens for relay setting.
23. What is REF?
24. Why is it necessary?
25. Why the differential relay cannot protect it?
26. What is the philosophy of REF?
27. Does it depend on the grounding?
28. Are you aware of symmetrical components?
29. Why are they used?
30. What is the purpose of using symmetrical components?
31. How you can measure fault using hte symmetrical components?
32. What is unbalanced and balanced fault?
33. Is 3Ph a balanced fault?
34. Then what can be the unbalanced fault?
35. How do you read the Voltage and current?
36. How can you say that they are balanced?
37. How can you make a graph of it?
38. How is a displaced wrt b and wrt c?
39. At what angle?
40. what shall be the order of the abc?
41. Can you give the example where you do phase chagne?
42. What about the motor?
43. How do you revrerse the direction?
44. What did you study in your undergrad?
45. What all things you learnt as a course work there?
46. What are your goals 5-10 years down the line?
47. can you explain the gap in your service?
48. Have you worked on Aspen, Mathcad, before?
49. We only work with SEl relays.
50. What all books you have read for the relays?
51. How did you learn the relay setting?
52. How did you cross check the relay setting.
53. Do you do hand calculation for hte relay setting?
54. How was you site experience?
55. Did you assist somebody or helped somebody for relay commissioning.
56. How exactly you have worked on site?
57. I am kind of surprised, how can you commission so many relays in 5 years.
58. What kind of projects do you have?
59. Have you read the papers from SEL ?
60. How good are you with making presentations?
61. Have you made presentation before?
62. How good are you writing technical papers?
63. How did you learn all this?
64. What motivates you to work for us?
65. What kind of load shedding knowledge do you have?
66. How much familiar are you with Mark VI and load shedding at generation end?
67. What application you have seen?
68. Mainly you can focus on doing relay setting from the HMI?
69. Can you explain your recent relay setting, how did you do it exactly?
70. Did you make all calculations by yourself?
71. Somebody else did for you?