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Distance relays used for protection of transmission lines have problems of under-reach, over-reach and maloperation due to high impedance faults. Further the problem is compounded when the distance relays are used for protection of double circuit transmission lines due to effect of zero sequence mutual coupling. Different types of faults on a protected transmission line should be located correctly...
Faults that occur on transmission lines are relatively more common in countries that have extreme weather. Most faults in such countries are caused by lightning storms. For long distance transmission lines, it takes a long time to find the faulted point. This not only prolongs the time of removing and recovering the fault, but also increases economical damages. If fault can be precisely located, maintenance...
Isolation of a faulted segment, from either side of a fault, in a radial feeder that has several converter interfaced DGs is a challenging task when current sensing protective devices are employed. The protective device, even if it senses a downstream fault, may not operate if fault current level is low due to the current limiting operation of converters. In this paper, a new inverse type relay is...
Process variation is expected to persist in the various novel nanoscale fabrics being proposed to replace CMOS. Logic circuits built using non-traditional and bottom-up techniques will need to meet new design rules, such as tolerance of high defect rates and use of regular structures in layout. One circuit fabric type that meets these requirements is grid-based logic, with built-in fault resilience...
The doubly-fed induction generator (DFIG) based wind turbines of today are often equipped with a crowbar, which can be used to limit the inrush rotor current and protect the ac excitation converter from damage via a set of resistors that are connected to the rotor windings of the DFIG. When the rotor current becomes too high due to the severe grid voltage dips on the transmission line, the crowbar...
Existing schemespsila characteristics to measure capacitive current are analyzed, in order to measure capacitive current of distribution network in formidable conditions of coal mine. The new measurement scheme of capacitive current is put forward, which is based on a resistant added single-Phase line. Using this new method, the capacitive current of single-phase ground fault is predicted through...
The transformer model described in the present paper belongs to the class of low frequency models. The generation of the core parameters for the model is easy, and it does not require any substantial skills on the part of the user. The transformer model was originally developed as a model for the study of harmonics due to the non-linear effect of the core. This model can also be used for the investigation...
High resistance grounding (HRG) of 480 V to 5 kV industrial power systems increases service continuity, enhances personnel safety and reduces equipment damage when a ground fault occurs. HRG allows maintenance personnel to quickly and safely locate a ground fault while avoiding unscheduled downtime. An abundance of literature has been published on HRG practices since the mid-1970s. Recent years have...
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