New applications of non-linear circuits to relay and control problems

CONNECTIONS of reactors and capacitors in series and in parallel permit obtaining voltampere characteristics which are non-linear and which present interesting possibilities when applied to voltage sensitive and current sensitive relays. With the reactor and capacitor connected in series and properly adjusted, there is a value of increasing voltage for which the current suddenly changes to a high value, and another value of decreasing voltage for which the current suddenly decreases. These characteristics assist in obtaining a relay which is sensitive to small changes in voltage. Similarly, a current sensitive relay can be obtained by the parallel connection of reactor and capacitor.