Electricity: measuring and testing – Electromechanical switching device – Circuit breaker
Patent
1995-12-07
1998-01-20
Brock, Michael
Electricity: measuring and testing
Electromechanical switching device
Circuit breaker
340638, G01R 3102
Patent
active
057105138
ABSTRACT:
A circuit breaker testing apparatus includes an electrical circuit, an adjustable inductor connected in the circuit and a transducer for sensing current flow in the circuit. The circuit has leads terminated by electrical connectors for connection to terminals of a circuit breaker for providing a source of electrical power to circuit from the circuit breaker. The inductor is adapted to produce an adjustable electrical load on the circuit breaker. The testing apparatus also includes an indicator connected to the transducer for producing a reading of the magnitude of current flow in the circuit and for displaying and holding the reading of the highest magnitude of current flow reached in the circuit and thereby the magnitude of current flow at which the circuit breaker is tripped by the adjustment of the electrical load on the circuit breaker. A mechanism is provided for adjusting the inductor so as to reduce the electrical load produced on the circuit breaker and thereby increase the magnitude of current flow drawn through the circuit breaker circuit to cause tripping of the circuit breaker. The inductor includes a coil connected in the circuit and a ferromagnetic core being spaced apart and movable relative to the coil so as to continuously vary the impedance of the core to the flow of current in the circuit.
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