| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Earth fault | Mining | Electrical short circuit from live conductor to earth. (references) | |
| Earth fault lockout system | Mining | An electrical system whereby a circuit is monitored to prevent application or restoration of supply if an earth fault exists. (references) | |
| Earth fault meter | Mining | An instrument for measuring the insulation fault at low voltage without polarization. This instrument is more informative in checking detonators in loaded holes than the insulation meter. (references) | |
| Earth fault protection | Mining | A system of protection designed to cause the supply to a circuit or system to be interrupted when the leakage current to earth exceeds a predetermined value. Also called earth leakage protection. (references) | |
| Earth fault tester | Mining | An apparatus used to prevent or reduce current leakage to the ground when blasting in conducting orebodies, in wet shale or clay, and in underwater blasting, esp.in salt water. The apparatus has no battery and can be used when loading the hole to check if the conducting wires have become damaged during this operation. Syn: current leakage tester. (references) | |
| Restricted earth fault protection | Mining | As used in mining, a system of earth fault protection in which the fault current is limited, without requiring the use of sensitive earth faultprotection. (references) | |
| Sensitive earth fault protection | Mining | A system of earth fault protection in which the fault current is limited by design to a low value which generally requires amplification in order to operate an earth fault relay. In the case of three-phase alternating-current systems, the limitation of the leakage current may be effected by either (1) inserting a current-limiting device between the neutral point of the system and earth (single-point earthing), or (2) connecting, in each circuit to be protected, all phases, in star, through current-limiting devices, each star point being connected to earth throughan earth leakage protective device (multipoint earthing). (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
