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Tanks all

which of these two type of earthing should we select for HV system( 33Kv)? and why ? tanks for your help

Tanks alehman yes,in my case an impedance exist. but what is the advantage of using this ampedance ? and you mean for reaching to 450A i should 31.5KA/R ???

for example in my project SC level of main busbar 33Kv is 31.5 KA and earth fault level is 450 A??!!! I have confused!

you assume motor in noload condition! there is a slip(speed) at this condition certainly,(ind-motor can not reach sync speed) if we load the motor(full load), we reach to another speed !! am i correct? what is the diffrence between two speed or which of them ic nameplate speed?

hi all i want to know the nameplate speed on induction motor is full load speed or no load speed? i know when T-s charactristic induction motor and load charactristic cross together we have definite slip and load speed,but is it equal nameplate speed?

Tanks ScottyUk, heavy duty pvc use for electrical duct,in fact we want to install cables through the electrical duct bank.

but i have earthing fualt level in 11 kv side(30a), and i want to calculate this at 33 kv side 11/33kv conected to main busbar????

Tanks davidbeach, ITR is acronym of Instrument Technical Room, regards,

assume 400 volt cable around 50 meter from main substation to ITR, we want to install power cable at diffrent size between 2 bulding throgh pvc pipe undeground, which type of cable armour or nonarmour cable is better to use?

hi all what do you prefer, using unarmoured cable OR armoured cable throgh pipe during installation and why? is there any reference regarding to this matter?

what is the difrence between short circut level and earth fault in electrical system, i can calculate SC level in a system,but how can i calculate erath fualt level?? regards ,

one plant description : 4 gtg 42 MW(11/33 transformer) sc level 31.5 KA load 100 MVA -we have big motor 11 kv 7MW , with transformer 10MVA 33/11 delta /star and earth fault 30A( star point to earth with resistance) -for 6KV taransformer earth fault is 50A( star point to earth with...

why do we use zigzag transformer to craete earthing for big plants? for example: 4 frame 6 gtg 42mw 4 delta /star transformer 50mva short circuit 23 ka max load 100mw bus rating 2500A 3 SECEND

we have a 132kv external line near a plat which has been conected to big strong network(general neetwork), we want to use this line and build 33kv primery voltage, without transformer , is there any way to reach this matter?

tank u guyes