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Whats meant by trivector meter where it is connected at the
substation?
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Answer Posted / mohit bharti
trivector means 3 types of power i.e.
1.VA= V*I
2.Watt = V*I*cos Wt
3.VAR = V*I*sin wt
where:-
v= applied voltage.
i= resultant current.
wt=phase ange between them.
a singe divice can measure all 3 power at a time.
normally at substations this term is used for feeder
input/outgoing power.trivector meter is also of 2 types:
HT meter connected at high Tension side of transformer.
LT meter connected at Low Tension side of a trnsformer.
Because in high tension line voltage is of 11 KV and above
range and this type of meters have not made which connected
directly in high tension line so it's connected with PT
(potentail transformer)which step down the voltage and
meter recieved this voltage.In meter software PT ratio is
already known by the manufacturer.
For exampe if a high tension line voltage is 11 kv line to
line and PT ratio is 100 then meter actually reads
11000/100= 110 volt line to line and in software
calculation it reads the actual reading by PT ratio.
So VA power is calculated by meter is
VA= 110*current*PT ratio
some time a CT(current transformer) is also used for
current measuring and CT ratio is known.then calculation is
VA= voltage*PTR*current*CTR.
Normally PT is used for HT Line and CT is used for LT line.
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