Disadvantages of old-style relay protection

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The disadvantages of solid-state relays are their high cost, sensitivity to temperature and voltage fluctuations, and need for external power sources. These design changes brought about the need for more sophisticated electrical distribution protection, which coincided with the early generations of electronic protective relays, including the widely employed GE Multilin and ABB circuit shield relays. They are intended to quickly identify a fault and isolate it so the balance of the system continue to run under normal conditions.

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