Abstract: Disclosed is the physical construction and electrical control circuit of a fault indicator designed to provide a watertight structure for the indicator. One face of the indicator is visible through the sealing apparatus, the sealing apparatus enclosing the structure on all sides other than the indicator face side. The indicator is capable of being submerged and will withstand a water pressure of 8 psig to meet specifications established by electric utilities. The electrical control circuit normally causes the transformer to operate below its saturation level resulting in quick response to changes in input current, and providing improved temperature stability of the control circuit.

Abstract: A magnetically shunted current transformer for use with a current carrying conductor, and being of the type having a non-distributed secondary winding is disclosed. The transformer includes a magnetic core comprising first and second separable core sections adapted for placement about the conductor wherein the ends of the sections abut one another to form a substantially continuous core about the conductor. The secondary winding is carried by the continuous core and surrounds a portion of at least one of the sections. A spring bail clamps the core sections together. First and second magnetic shunt members are respectively disposed on opposite sides of the continuous core. Each shunt member comprises a plurality of stacked steel lamina forming a lamination having an elastomeric housing or a jacket molded thereover. The shunt members are provided with a geometry substantially conforming to the continuous magnetic core except at their end portions which confront the secondary winding.