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The application of IEC 61850 brings significant changes to the instrumentation, monitoring, communication, control and protection systems used in the substation automation system (SAS). Compared with the conventional substation system, the implementation of IEC 61850 provides more flexibility in SAS architectures, but it also raises concerns about the reliability and performance of the overall system...
It is very difficult to correctly identify single-phase-to-ground fault (SFG) in distribution system with neutral non-effectively grounded (NNG). A novel travelling wave based single-phase-to-ground protection is proposed in the paper. The polarity of initial transient current and voltage travelling waves are used to identify the fault direction, and power frequency voltages are used to distinguish...
The paper presents the novel method of Out of Step protection in multiterminal HV transmission system. The new approach takes advantage of synchrophasor measurements dispersed within the system. The measuring data are used to execute multi point-to-point detection algorithm. The method based on the phenomena that during loosing of system stability, the difference of voltage and current frequency in...
The application of a Wide Area Monitoring Protection and Control (WAMPAC) system in a 110 kV local area distribution network (six 110 kV substations) is presented in this paper. The WAMPAC system consists of a central unit, and a local unit at each of the six 110 kV substations. It integrates the functions of monitoring, protection and control in the system. The protection function includes feeder...
Scottish Power's Transmission business has implemented the integration of protection, control and auxiliary functions within IEDs over a number of years. However, this has been an unstructured incremental process which did not take full advantage of the facilities offered by the current generation of IEDs and a formalised approach was required. This paper describes the motivation and the constraints...
This paper proposes a novel protective relaying technique for multi-terminal HVDC system based on the high frequency components in the current signals received at each end of the DC transmission line. A simple model of a mono-pole, ground return, MTDC system is built in ATP draw using a distributed parameter, frequency dependent overhead line model. For this system, the high frequency content in the...
The use of IEC 61850 protection and control in power system substations is the modern standard. As well as its established use in three-phase national power systems, it is being increasingly applied to railway electrification networks, and offering increased functionality and performance. This paper considers this extension of traction substation networks utilising the IEC 61850 architecture to include...
Based on advanced digital processing and comprehensive automation technologies, smart substation aims at improving the security, stability and flexibility of the power network. Due to the application of electrical instrument transformer, reliable and integrated intelligent device, digitization of substation area information and IEC61850 protocol, new protection scheme of smart substation can be constructed...
The aim of this paper is to present the operation and utilization of a digital protective system for power subsystems, which consist of a power generation unit and a transmission line. The specific protective system has been designed and developed by the Greek company “PROT.A.S.I.S SA” [1] and is established in the electric energy systems laboratory of the School of Electrical & Computer Engineering...
Traditionally, process automation and power automation systems in an oil & gas platform are interconnected by extensive hardwiring. This method is not cost efficient due to the amount of cabling and engineering involved. In addition, different protocols used in power automation leads to a variety of engineering tools, protocol converters, gateways and additional hardware which increases the engineering...
With the increased complexity of automation systems in high and medium voltage substation due to a more advanced implementation and use of IEC 61850 [1], the need for better overviews of how protection and operating functions are implemented in these systems is becoming a bigger challenge. The traditional substation documentation is no longer sufficient and needs to be augmented based on the requirement...
As more and more power systems are integrated together, there is and will be a greater challenge for Wide area protection including protection of mixed power lines. Also with the advent of new emerging communications protocols such as IEC-61850 series and IEC-61400-25, and with the desire to automate more and more power systems, the need for systems design and systems integration has gained a lot...
Traditional special protection systems (SPS) take action according to generator rejection scheme (GRS) or load shedding scheme (LSS), which is simulated on an annual operation mode and therefore contributes to the following two problems: on the one hand there may be worse situations in the real-time power grid, in this case, GRS which is simulated on the basis of annual operation mode can't ensure...
This paper presents the design of a new substation automation system architecture based on industrial automation technology, the development of an IEC 61850 compliant distance protection scheme and its test results. The proposed centralized structure means benefits for system integration since a higher degree of standardization can be achieved. Furthermore the approach guarantees manufacturer-independent...
Some power transformers, especially new designs with the core material improved for lower losses, produce low levels of second harmonic in their inrush magnetizing currents. Transformer differential relays face security problems when the second harmonic falls below the traditional 15 or 20 percent setting level. This paper derives a new protection method for detecting inrush conditions. The new algorithm...
The paper is focused on the operational experience with an automatic system for additional earthing of the faulty or healthy phase during an earth fault. The system is primarily used for limiting of a fault current in the point of the fault by earthing of the faulty phase during an earth fault. The equipment for additional earthing of faulty phase can also be used for short-time connection of healthy...
The microprocessor-based protection for high-voltage magnetically controlled shunt reactor (MCSR) is presented in this paper. Protection schemes comprise working winding protection, control winding protection, compensation winding protection and backup protection. Along with discussing the overall protective schemes, the focus of this paper has placed on the control winding protection, which is an...
To solve the problems related to configuration and principle of backup protection in conventional substations, a new scheme of Substation-area Differential Backup Protection (abbr. SDBP) oriented to intelligent substations is proposed by this paper. The new scheme takes the whole substation and all connected transmission lines as an object to be protected. Through defining four types of differential...
This work presents a Hybrid Genetic Algorithm (HGA) for directional overcurrent relays coordination in a real meshed power system, which is part of the Brazilian power transmission system. The HGA combines linear programming and genetic algorithm to find the correct relay settings that enable system coordination. The coordination is achieved by minimizing the relay operating time. The power system...
Substation automation solutions have been progressively migrating to higher levels of digital technology over the past decade or more, as IEC 61850 has gained ground globally. The technology available today makes fully digital substations feasible — at the process level as well as the station level. Digital substation implementation allows the lifetime total cost of ownership of the substation to...
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