Mr.smallgreek
today measuring voltage by using anloge meter but reading not change
after that connect light no change in reading i mean Vn=400 v
VL-L=710v and connect resistance also no change in reading
Mr will drawing state in the file attachment
sir
iam sorry but cannot connect resistance why? because the device relay is reading 400v voltage to neutral and 700 volt phase-to-phase
this voltage is real in busbar now can be obtain zero voltage by drawing breaker in test position
but only i need know reason for why voltage 700 in basbar...
hi
we have transformer three winding 132kv/33kv/6.6kv
and power 63MVA
now how dividing load crossing winding i mean when load from side 6.6kv this effect to side 33kv or only loading for 132kv
onther words when loading to side 6.6kv is effect to 132kv(primary) or effect too to 33kv
hi
how calculated rated for time
example if NGR=38 OHM for 10 sec but i need calculated for value NGR if time 1min or 10 min
also if rated for transformer 100kvA FOR 10 SEC WHAT RATED for 1 min
i need how calculated or i need equation
thank you master
look when breaker in service position and open and incomer is live( I mean 33kv is found)
Problem the bus is reading vn=400v or VL-L=700v
i mean founding VT capacity 100VA but when loading by big transformer the voltage will zero
now VCB test by car test but the car no...
Mr. smallgreek
what you mean
please i need more information
you mean distance between fixed contact and verable contact is not enough to reducing capacitive
how solution this problem
i know but Varlogic NR6 -N12 cannot reading true power i mean source voltage 6600 but voltage in device 110v how matching between this voltage to obtain true reading in medium voltage
in maunal said
In HV applications the power values displayed in Measurement Menu represent only the...
hi
we have vt transformer Y/y/d 33kv/110/110
now d is connected open to detection earth fault true?
the end for open delta is connected to damping resistance
now
1- Why take advantage for using damping resistance?
2- how calculated value damping resistance?
3-when not using damping...
hi
how calculated rated power for
1- zagzag transformer with 10sec,30sec,1min,10min
2- NGR with 10sec,30sec,1min,10min
3- reactance with 10sec,30sec,1min,10min
4-star-delta closed with 10sec,30sec,1min,10min
i need equation for calculated
this informaton is very importment
please and thanks
what is mean set the CT ratio to percentage scale?
also when change to the ct ratio to percentage scale on effect to power factor
i need example please how matching if I=400A and vt=110 volt,pf=0.9
but voltage source 6600V
now power=1.73x110x400=76.2kw
but true value=4.57MW
hi
We have in AIS ABB substation breaker 33kv (VD4) VCB made in ABB china
But when breaker in service position and open and incomer is live( I mean 33kv is found)
Problem the bus is reading vn=400v or VL-L=700v why? Must be reading zero because breaker off
Now if breaker is drawing to...
hi
1- i having load 500kw working at 400volt
and have motor 360kw working 6600 by using step-up transformer
2- how choose power step-up transformer?
3-at starting motor 360kw how many time need to stability for generator i mean at starting voltage generator is reducing the governor and AVR will...
hi
1-how choose transformer suitable for metering or protection?
2- what happend if VA off load greather than VA for transformer current? for example metering CT 10VA 500/5 and load 1.2 ohm
now max.load=10/25=0.4 ohm but load=1.2 what happend for ct
3- how caculated knee voltage Vk
