State estimation technique obtained from CCVT transient studies

CCVT (coupling capacitor voltage transformer)
电容式电压互感器
is widely used in Electric Power Industries.
due to its complex structure and operation principle, the transient characteristics have attracted attention from all over the world to study what is affecting the transfer functions.
among the past research, serveral famous methods are undertaken:
a) off-line or lab test by applying operation voltage to the primary to simulate working conditions.
b) online measurement from the secondary.
c) off-line or lab test from the secondary, take advantage of parameter identification.

IEEETM has been conducting research and experiment parameter studies in order to obtain accurate parameter of transfer function, which will be used for online fault forcast.
Also in order to make the project feasible, online monitoring has to combine with offline data in order to adjust internal parameter by iteration techniques, as a way to analyze transfer characteristics.

Traditionally, there is much cost to test a CCVT by offline test, as it requires a standard transformer and high voltage power source, there may be some portable way of testing the CCVT which also guarantee the test accuracy.

So, a possible way is to apply test signal from the secondary, in reference with a mathematical model to iterate parameters.
Among the techniques, safety issues and noise problem should be taken into consideration.

This project is open for discussions.

Vieena Apple
IEEETM center