voltage transformers

Has been analyzed possible methods of earthing of neutrals in 35 kV power grid. Among the most common injuries in these electrical system are arc circuits, that is why the dependence of overvoltage multiplicities on the nature of earth arcing and on the method of earth arrangement of electrical system neutral. Given that in 35 kV power grids may arise ferroresonant processes, operation of voltage measuring transformers has been researched during unstable earth arcing. 

The problem of  ferroresonance processes  in power gris  with isolated neutral was reviewed. Conditions of the existence of such phenomena and basic principles of theis control were establihed. A new approaches of protection for 10 kV electric systems  from ferroresonant processes were given. The research was conducted using digital simulation and reasons for offered protection methods were defined.