Why the Transformer Nuetral is grounded?
Answer Posted / p_g
In practical cases the three phase voltages are not equal and there will be presence of potential at the neutral point and neutral is earthed to provide the path for unbalanced current during normal operation. The earthed neutral also helps during any abnormality in the system due to fault,it allows heavy currents to flow into the ground before the system isolated by means of protection system.
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
what is smart grid? why we use it? explain in detals bcoz i want give presentatin from it....
which one is more efficient, torq, power & ecnomy with the same frame size AC motor / DC motor?
cc of scorpio?
how can decide the current rating of oltc
What are the material used for inductance coil?
I want to design a heating coil of 80/20 nicrome for 3.5KW please give me the calculations choosing for physical dimensions assume coil voltage will be 110V AC assume necessary conditions
If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.
Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?
in 6.6 kv vaccum circuit breaker vaccum bottole vaccum capacity ????
Has someone here done a sizing for a generator (3 phase), its for a pumping station. If you have an example for standby/duty and both running (I) star delta (ii) Soft Starter.
how to copy from plc ge fanuc versamax series,all input and output, adress, and printout.
the problem faced on star or delta winding connection??
what is the difference between STAR and DELTA connection and application wise how it can be utilizedd
What is the main cause of magnetism?