Sensitive ground-fault protection for mines. Phase 1. Aalternating-current utilization. Open File report

Technical Report · Sat Sep 01 00:00:00 EDT 1984

OSTI ID:5414093

Morley, L A; Trutt, F C; Novak, T

The report concerns the research and development of sensitive ground-fault relays for ac utilization systems in mining. Sensitive relaying employs very low pickup levels such that, when used in conjunction with very high resistance grounding, the exposure of a human to ventricular fibrillation is significantly reduced. To delineate the desired relay characteristics, the report commences by reviewing and updating previous research in this area. The critical relay component for sensitive ground-fault relays has been found to be the current transformer; their theory and design are detailed. Electronics for two prototype relays have been produced through the research and information is presented so that either may be duplicated.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Mineral Engineering
• OSTI ID: 5414093
• Report Number(s): PB-85-185767/XAB
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
01 COAL, LIGNITE, AND PEAT
ELECTRICAL FAULTS
SAFETY ENGINEERING
MINES
ALTERNATING CURRENT
RELAYS
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ENGINEERING
EQUIPMENT
UNDERGROUND FACILITIES
570000* - Health & Safety
016000 - Coal
Lignite
& Peat- Health & Safety