Module 2 : Current and Voltage Transformers
Lecture 8 : Introduction to VT
8.4

Classification of CCVTs
 

CCVTs can be classified into following two types:
Class 1
Class 2
  Table 8.1 shows the maximum limit for the ratio and phase angle errors. It can be seen that errors of Class 2 type are double than that of class 1 type.
 
Table 8.1 : Limits for Ratio and Phase Angle Errors

VT Class

Maximum ratio error

Maximum phase angle error

Class 1

Class 2

 
1
6