Protection Engineering Basics and Schemes Protection Engineering | Page 47
1.2.4 Capacitive Voltage Transformer:
It is simple potential divider, and the most economical solution,
It is simple potential divider circuit, but problem disturbance in output voltage when we connect burden / load on tapping point.
V = IX c 1 since X c = 2 ∗ pi ∗ f ∗ c
In parallel
= Z c1 +( 1 Z b
+ 1
Z c2
)
Z c2
V b =( V s)() Z c2 + Z b
Due to Z b output voltage can be disturbed, to compensate that we employ reactance in series with burden and connect it in between tapping point and burden.