hello, i have two question:
1-How a sf6 circuit breaker can catch the zero current to extinguish an arc ? is there a sensing device or this is a natural consequence of a mechanism designed?
2- is there any application such as parallel operation of ups with utility? i just ask due to curiosity ...
There are some questions of cogeneration power plants i need to ask you..
1- How is the feederthat feeds excess energy to or draws energy from the utility named ?
2- ?s there an important locking of circuit breakers on this feeder (I heard but dont know if there is one why?)
3-?s it important...
as far as i know, it is more difficult to break lagging currents than break resistive currents. is it true? if it is true why? does it matter the lag of the current,?
some say that when a high frequency source gets near to a flourescent lamp it makes the lamp work ,so is it true and if so what is the principle ? magnetic field or electric field or frequency?
hello, ? have a critical load (8 operations room in hospital) and want to feed this load with 2 40 kVA UPS (parallel operation).Maximum load is 80 kva or so, now what if i do this instead of 1 80 kva ups? ups type is online and if i use 2 x40 kva ups it will cost less and i think this will be...
why open delta connection causes 30 degree phase shift? can you explain this ? also is 30 degree phase shift obligatory or design issue in delta-wye connections?
