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Meaning of the Four Characteristics of Relay Protection
In, a protective relay is a device designed to trip a when a is detected. The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current,, reverse flow, over-frequency, and under-frequency.
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Meaning of polarization-maintaining fiber optic patch cord
PM patch cables are specialized fiber optic jumpers designed to maintain the polarization state of light during transmission. Because it has mode adjustment cables and fiber optic loopback, it can meet many user requirements. using the Polarization Analyzer SK010PA. Different types of polarization-maintaning fibers are designed depending on the geometry of the stress elements: “PANDA“ fibers. The PM Patchcord series has excellent enviromental stability, high return loss, low insertion loss.