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james_clark

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  1. In the field of electrical engineering, a relay is a relay device designed to trip a switch when an error is detected. The first protection relays were electromagnetic devices based on mobile coils in motion to guarantee abnormal operating conditions such as over current, over voltage, inverse flow, over frequency and reduced frequency. The digital protection relays based on microprocessors now emulate the original devices, in addition to providing non-practical protection and non-mechanical monitoring with electromechanical relays. read more at here http:// electrotopic. com/what-is-psm-in-relay/
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