what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in c

what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree
centrigate ohm in current transformer name plate?

Question Posted / varun tripathi

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what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in current transformer n..

ALF--accuracy limit factor(ratio of nominal over current to the rated current)
KPV--knee point voltage(secondary voltage must be less than KVP so that ct accuracy will not hampered)
KPV=k.Is(Rct+Zs) where Rct=resistance of secondary winding at 75 c

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what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in current transformer n..

Answer / m.esakkiraja

1. ALF - Accuracy Limit Factor
It is the ratio of Instrument limit primary current to the Rated primary current.

2. KPV- Knee point Voltage
It is defined as a point where 10% increase in the Secondary Voltage causes an increase in the Secondary Current by 50%.

3. Iexc- Excitation current
A transformer exciting current is the current or amperes required to energize the core.

4. Rct @75°C - Resistance of Secondary winding on CT at 75°C.

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