The rain drummed against the window of the substation office, a rhythmic pulse that matched the flickering of Elias’s computer screen. On his desk sat a heavy, ring-bound binder titled Protection Relay Application Guide
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He flipped the guide to the section on "Differential Protection." His fingers traced the diagrams of current transformers and tripping coils. The theory was simple: what goes in must come out. If the balance tipped, the relay had to act within milliseconds. But the digital relay on the rack across from him was hesitating. It was seeing a ghost in the current, a transient surge that shouldn't be there. The rain drummed against the window of the