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How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.
1688what is the defination of Cable database? What are the points are considered while preparing cable database? Is there any sample available for cable database?
1855WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.
2025why the three phase transformer's star point does not sparks or seperated? while we often see that two phases touches each other it sparks and ocationaly conductor breakes out.
4 8436Can we parallel two grid with different incoming voltage. Ex.let say one grid is 132kv and another is 220kv.
2 4748Post New Electrical Engineering Questions
I have 2 KW electric water heater.I am gonna use it in controlling water temp.so I needed to increase or decrease the heating capacity.is there any electrical-electronic circuit for varying the resistance & so current?
What is the meaning of dedicated earthing?
why can the rotor of 3 phase slip ring induction motor not be a 2 phase rotor?
How to calculate cable rating for 3 phase supply?
in electrical control panel. how can i choose the cable rating. (example - 11kw motor, 18-25A mpcb}
PLZ SEND ME SOME UNIQUE PROJECT OF ELECTRICAL ENG (B.TECH)
difference between the applicability of nortons and thevenin theorem
sir iam from electrical and electronics branch ,can i appear for the hpcl offline requirtment? if yes please mail me on vikram_raju25@yahoo.co.in
how to calculte capacitor range for single phase induction motors??pls tel
What is the lockout relay
how to carried out DAR test in 11 KV Alternator ?
Please tell me in DETAIL about the following 3 types of fuses or recommend me a good power system protection book or a website link ? 1.Dropout Fuse 2.Striker Fuse 3.Empulsive fuse (not sure if its impulsive or explosion fuse , sorry)
i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.
TRAFO 1. WHY BREATHER IS USED. 2. WHY OIL GOES DOWN IN CONSERVATOR TANK. 3. WHY WE ARE TAKING OIL SAMPLE TAKING FROM BOTTOM OF TRANSFORMER. 4. HOW TO CHECK IR VALUE OF TRANSFORMER. 5. WHY OLTC HAVING BUCHHOLZ TRIP ONLY; WHY NO ALARM. 6. OFF LOAD TAP CHANGER OPERATION PROCEDURE. 7. TR. SHUTDOWN / ISOLATION PROCEDURE. 8. WHEN THREE TRS. IN PARALLEL, ONE TR. IS NOT SHARING THE LOAD – WHAT IS REASON AND WHAT YOU WILL DO. 9. WHY TR. HAS OLTC IN HV SIDE. 10. WHAT IS % IMPEDANCE. 11. WHY TR. RATING IN MVA. 12. WHAT IS VECTOR GROUP IN TR. 13. CONDITION FOR PARALLEL OPERATION OF TRS. 14. WHAT IS TERTIARY WINDING. WHERE IT WILL BE. 15. IF TR. TRIP ON BUCHHOLZ OR TAP CHANGER RELAY, WHAT YOU WILL DO. 16. DIFFERENCE BETWEEN OIL TEMP. AND WINDING TEMP. PROTECTION 17. HOW WINDING TEMP. IS MEASURED IN CAST RESIN TR. 18. DIFFERENT TYPES OF FAULTS IN TR. Trafo - Page-1 of 2 19. WHAT HAPPENS WHEN TR. CHARGED FROM LV. 20. WHAT WILL YOU DO IF MEGGER READING SHOWS ZERO BETWEEN LV WINDING AND EARTH. 21. CAN WE INTERCHANGE BUCHHOLZ RELAY OF MAIN TANK AND OLTC TANK. 22. IF THE LINE BETWEEN BREATHER AND CONSERVATOR TANK 23. LOCKED, WHAT WILL HAPPEN DURING LOAD CYCLE. 24. WHAT IS THE FUNCTION OF OIL SEAL IN BREATHER. 25. WHAT ARE LOCATIONS FOR BUCHHOLZ RELAY FIXED IN POWER TR. 26. WHAT ARE CHECKS IN POWER TR. DURING MAINTENANCE. 27. WHAT IS IMPORTANT WHEN WE CHECK OLTC OPERATION DURING MAINTENANCE. Trafo - Page 2 of 2
Please elaborate th´evenin’s theorem?
