Metal Oxide Lightning Arrester: Metal oxide lightning arrester belongs to the new generation of station metal oxide surge arresters developed by General Electric Co. in 1976. This is useful for the protection of systems rated…
Oxide Film Lightning Arrester: Oxide film lightning arrester operates on the fact that certain dry chemicals have the property to change rapidly from a good conductor to almost perfect insulator when slightly heated. For example,…
Thyrite Lightning Arrester Diagram: Thyrite lightning arrester is most common and is mostly used for the protection against high dangerous voltages. It operates on the fact that thyrite, a dense inorganic compound of ceramic nature,…
Impulse Protective Gap Arrester: It was pointed out that the sphere gap has an impulse ratio of unity, but suffers from the drawback that the arc between its electrodes is not self-extinguishing. The horn gap…
Sphere Gap Arrester Diagram: In such a sphere gap arrester device the air gap is provided by two similar spheres—one connected to the line and another grounded. The spacing between the two spheres is very…
Carrier Aided Distance Protection Scheme: The directional comparison carrier pilot relay schemes presently employed are built around standard three-zone step type distance relays. This speeds up fault clearance for internal zone 2 faults. The carrier…
Directional Comparison Carrier Current Protection: The protection operates on the basis of comparison of the fault power flow directions at the two ends of the protected line. Operation takes place only when the flow of…
Carrier Current Protection of Transmission Lines: In modern high-power electrical systems it is necessary to have quick acting protections on long transmission lines. The requirements to be met by such protections are fully satisfied by…
Merz Hunter Split Conductor Protection of Feeders: This Merz Hunter Split Conductor Protection of Feeders system is another method of securing the benefits of a balanced method of protection without the necessity of using pilot…
Current Graded Overcurrent Protection: An alternative to time grading or in addition to time grading, current graded overcurrent protection can be applied when the impedance between two substations is sufficient. It is based on the…
