Westinghouse Protective and Control Relays from 1924
This excerpt from the 1924 version of Silent Sentinels lists the protective and control relays used in the early days of electrical systems. This is the 12th in the series.
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The Good Old Electromechanical Protective Relay
The electromechanical protective relay converts the voltages and currents to magnetic and electric forces and torques that press against spring tensions in the relay.
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