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With the growing scale of wind power penetrated into grid, protective relays of transmission line face the challenges of adaptability. The relays based on fault component are widely used in transmission line protection, which makes it essentially important to study the adaptability of fault component protection. The adaptability of fault component protection to wind farm integration system is studied...
In this paper, a novel distance protection algorithm for longdistance transmission lines is introduced to cater for the problems of the influence caused by distributed capacitance in the long-distance transmission lines and the low fault resistance tolerance by traditional distance relays. To tackle the problem caused by the distributed capacitance in the transmission line, the observing point is...
This paper describes the protection challenges of ac underground cables and transmission circuits with mixed conductor technologies. In addition, the paper discusses the challenges of calculating the relay ac input quantities for faults along the underground cable circuit and of determining the fault loop impedances measured by ground distance relays. The paper provides application solutions for the...
Electrical arcs are dangerous and can cause great damage such as electrical fire, therefore, detecting the arc faults for power electronic systems on aircraft, ship and automobile is now receiving considerable concern. To develop suitable detection and location schemes for arc faults, modelling arc faults to represent and predict arc characteristic and transient response within the power distribution...
This research provides a detailed overview of the design and functionalities specified in electrical protection requirements for the grid-interconnection systems of a smart dc node used to feed electric vehicle (EV) charging stations. The survey focuses on protection relays. The multi-terminal dc node connects a 0.4-kV ac secondary distribution network (SDN), a 25-kV ac railway traction system (RTS),...
A multi-terminal dc node consists of voltage-source converters (VSCs) and dc-dc converters (DC-DCCs) is presented in this paper as promising topology to feed electric vehicle (EV) charging stations from renewable power. The research focuses on the detailed analysis of the characteristic behaviour of node currents under dc faults, and in particular its natural response, which can produce particular...
Existing thermal modelling and monitoring solutions cannot predict, detect and prevent hot spots caused by changes in the surrounding thermal environment for underground cables. Using Distributed Temperature Sensing (DTS) can provide you with a real time temperature profile of the underground cable. The benefits of this technology combined with real time Dynamic Cable Rating (DCR) systems, based on...
The use of time synchronization is essential in different applications. Time synchronization accuracy depends on the method being used, the structure of the time network and the implementation of timeservers and IEDs. This paper discusses these topics and presents methods to help users to be able to check the quality of their devices. This paper is divided in three parts. First, the traditional time...
This paper describes the design and testing of a new and innovative protection relay for protecting large variable speed Double Fed Induction (DFI) machines for pumped storage plants. The testing encompasses testing of the new protection with Non-Conventional Instrument Transformers (NCITs), Rogowski CTs and resistive voltage dividers, on a small DFI machine at EPFL as well as RTDS testing of the...
With the increasing attention to the penetration of distributed generation (DG) in the distribution system, it has become important to propose an appropriate protection strategy that is effective in the new condition. Since the power output of DG is intermittent, the traditional protection scheme based on definite or inverse time overcurrent relays is not suitable to distribution system with DGs....
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