An experimental impedance relay using the hall effect in a semiconductor

摘要

The paper describes a new type of #x2018;definite#x2019; impedance relay applicable to the protection of power transmission systems. Its operation is based upon a differential balance, under normal conditions, between the output from Hall effect in a semiconductor element and a rectifier unit. The experimental results obtained demonstrate the success of this instrument in principle and show that it has many advantages over the usual induction type of impedance relay.