{
  "$type": "site.standard.document",
  "description": "In a system for preventing ground fault or other short circuit in electric distribution line system, caused by a break in a line, utilizing programmable relay protection in a plurality of relay devices programmed to monitor high sensitivity parameters, the improvement of refine protection, which…",
  "path": "/patents/1381511",
  "publishedAt": "2026-04-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J3/0012",
    "Robert B. Stuart"
  ],
  "textContent": "In a system for preventing ground fault or other short circuit in electric distribution line system, caused by a break in a line, utilizing programmable relay protection in a plurality of relay devices programmed to monitor high sensitivity parameters, the improvement of refine protection, which includes: in MODULE A, a protection subsystem having sufficient hardware and software that is programmed to detect changes in negative sequence overcurrent and instantaneous undercurrent on a main distribution line as well as a single phase tap line, utilizing a timer delay to calculate the changes over small periods of time. Second and third embodiments include substituting negative sequence with zero sequence readings in MODULE B or combining both MODULES.",
  "title": "Electric Distribution Line Ground Fault Prevention Systems Using Dual Parameter High Sensitivity Relay Device, Monitoring Small Current Reduction with Small Increase in Negative Sequence Current"
}