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In order to study phase-frequency characteristic of zero sequence current after single-phase earth fault in neutral indirectly grounded power system, this paper starts with the line model of distribution network, and analyzes phase-frequency character of zero sequence impedance for distributed parameter line model. By simulation analyzing, for a single feeder, the factors such as transmission line...
Modeling study provides a more effective and flexible way for research of high impedance fault (HIF) detection. An accurate model which can reveal most features of HIF is very important. In this paper, based on extensive investigation into documented test results, a set of most common and agreeable features of HIF has been summarized: the arc features, the non-linearity, the time-varied resistance...
The paper reviews the concept and development of the transient based protection and integrated protection for power systems. A number of new protection schemes with features of transient based and integrated protections are outlined. A new transient based integrated protection scheme for the protection of distribution system plant as well as distribution network as a whole using the transient polarity...
Various distributed generation units (DGs) are connected to utility power grid. With the advances in power electronics technology, many electronics converter interfaces have been utilized in DGs. The power balance control strategies can be achieved by the flexible control modes of the power electronics converter. However, because of the dynamic response and adjustment ability of the electronics converter...
This paper presents a new directional comparison protection scheme specially designed for distribution systems. A number of well-proved directional techniques were chosen for this study. To evaluate their performances, a typical distribution line system was modeled using EMTP, which is able to offer many variations to cover all possible fault conditions such as with different fault types, fault locations,...
This paper presents a new directional comparison protection scheme specially designed for distribution systems. A comprehensive study is performed on different directional discrimination algorithms and relaying schemes in order to assess their performances in distribution systems. An integrated solution was proposed, which combines better performed directional algorithms, such as the Negative sequence-based...
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