Microprocessor Based Differential Protection Of A Feeder Depending On Phase Comparison Of Current
نویسنده
چکیده
Aim of this paper is to protect a transmission line section/feeder from internal faults by means of differential protection through a microprocessor. The conventional differential relay operates on the circulating current principle, which involves a direct comparison of the magnitude and phase of the currents entering and leaving the protected equipment or line section. The present scheme is based on the difference in wave pattern of the secondary currents of the two CTs which will be 180o or more than that during internal faults and less than 180o during external faults
منابع مشابه
A New Algorithm for Digital Low-Impedance Protection of Busbars GER-4000 A New Algorithm for Digital Low-Impedance Protection of Busbars
The paper presents a new algorithm, its implementation, and results of extensive testing, for a microprocessor-based lowimpedance busbar relay. For increased security, the presented technique combines percent differential and current directional protection principles. The directional (phase comparison) principle does not require a voltage signal as it responds to relative directions of the curr...
متن کاملDesigning of a New Transformer Ground Differential Relay Based on Probabilistic Neural Network
Low- impedance transformer ground differential relay is a part of power transformer protection system that is employed for detecting the internal earth faults. This is a fast and sensitive relay, but during some external faults and inrush current conditions, may be exposed to maloperation due to current transformer (CT) saturation. In this paper, a new intelligent transformer ground differentia...
متن کاملPower Differential based Wide Area Protection
Current differential based wide area protection (WAP) has recently been proposed as a technique to increase the reliability of protection systems. It increases system stability and can prevent large contingencies such as cascading outages and blackouts. This paper describes how power differential protection (PDP) can be used within a WAP and shows that the algorithm operates correctly for a...
متن کاملtransformer differential protection using the fault-generated high-frequency transient components
Power transformers are the most important components of a power system, so their protection is a critical issue. This paper proposes a novel and efficient algorithm based on the high-frequency components of the differential current signal to discriminate between the magnetizing inrush currents and the internal faults. After detecting the over-current in the differential current signals, samples...
متن کاملA New Restricted Earth Fault Relay Based on Artificial Intelligence
The restricted earth fault (REF) relay is a type of differential protection which is used for detection of internal ground faults of power transformers. But, during external faults and transformer energization conditions, the probability of current transformer (CT) saturation increases. Thus, the spurious differential current due to CT saturation, can lead to REF relay maloperation. In this pap...
متن کامل