European transactions on electrical power vol:10 issue:3 pages:155-159
Practical countermeasures to prevent the occurrence of ferroresonance in floating systems are compared. Most attention is pain to the design of practical damping circuits. Existing criteria to determine the necessary ohmic load are evaluated and a new mathematical tool based on harmonic balance is presented. As the damping resistor can cause thermal overload of the voltage transformers, the use of a non-linear damping circuit is advocated in some cases. Therefore, the proposed calculation method is extended to include the effect of non-linear damping.