Presenters and Topics
Architecture developments in busbar protection in conventional and process bus substations
Presenter: Chee-Pinp Teoh | GE
Abstract: The basic building block of a digital substation is IEC 61850 process bus, or the concept of distributed I/O for protection, control and SCADA reporting. Much of the discussion around the digital substations has focused on the mechanics of the devices, architectures and technologies to publish sampled values (SVs) from merging units (MUs) to protection relays. One challenge that has been ignored is the processing of large amount of data streams for busbar protection. A busbar protection for a reasonably sized transmission substation requires current measurements from multiple bays, bus couplers and other resources, which require much more SV data streams than any other situation in the substation domain. This presentation discusses how a process bus busbar scheme can become the first step towards a fully digital substation. Topics discussed include the process bus implementation in the protection relays and busbar architectures, challenges and advantages.
Chee-Pinp Teoh is the Product Manager for GE Grid Solutions, based at Stafford UK. He is responsible for current differential and busbar differential application for GE MiCOM Px40 and UR Multilin relays.
New Design of Ground Fault Protection
Presenter: Yilmaz Yelgin | Siemens
Abstract: Ground fault protection is widely used to protect transmission and distribution lines in case of ground faults. Combined with a directional element and used in a teleprotection scheme ground fault protection can detect and isolate even high resistive ground faults which are not seen by distance protection. Today in general the directional element of ground fault protection is based on zero sequence components or negative sequence components. This presentation suggests a new design of ground fault protection using this additional information given by the numerical relays. The starting condition for the ground fault protection remains a threshold of zero sequence current. Once this threshold is exceeded a multi-criteria phase selector selects the faulted phase. Several criteria based on magnitudes of voltages and currents, changes in voltages and currents, symmetrical components and impedances are applied in parallel.
Yilmaz Yelgin is a Protection specialist working for Siemens in the development department of protection relays.
Investigation of the performance of protection functions for high penetration level of DGs
Presenter: Marjan Popov | TU Delft
Abstract: Although power electronic devices show good performance in terms of power support, the control strategy and its electrical architecture highly influence short-circuit current characteristics during faults. The waveforms of the fault currents with distribution generation differ significantly from those with conventional synchronous generators. During unbalanced faults, the reliability and the dependability of the some relay protection functions may decrease. This presentation deals with the investigation of the performance of classical protection functions (differential, overcurrent and distance) of two commercial relays (denoted as A and B). The relays are tested in a Hardware-In-the-Loop (HiL) environment and the strengths and weaknesses of these functions are determined. The results can be used as an overview of the actual protection device performances for different scenarios.
Marjan Popov is Associate professor in electrical power systems and protection. He is also director of the power system protection centre.
Contribution to types of tests of relay protection and failure analysis
Presenter: Marc Achterkamp | DNV GL
Abstract: Protection IED’s have become more complex over the years. Electromechanical protection relays electronic protection relays and the first generation of digital protection IED’s had only one primary protection task and had limited number of settings. Protection IED’s today are multifunctional, contain different communication protocols and have hundreds of basic settings and advanced settings. Configuration tools have become more complex in use. (Type) Tests are performed based on international standards. What is the impact of the hundreds of settings on the (type) testing of protection IED’s? What are common failures for protection IED’s? During the workshop experiences will be shared on type testing of protection relays. About 80% of initial type tests fails. Failures can be classified from minor to major. Finally, 95% of the type test pass after updating specifications and or modifications on the hardware and or firmware.
Marc Achterkamp is the head of section testing, metering, protection & substation automation at DNVGL
Performance of out-of-step tripping protections under high penetration of Renewable Energy Sources Presenter: Sadegh Azizi | The University of Leeds
Abstract: Power swing tripping (PST) is a System Integrity Protection Scheme (SIPS) that separates the power system into isolated islands to discontinue the path of interaction between generators operating asynchronously. Existing PST schemes can no longer operate reliably in the future systems with highly fluctuating generation input from renewable energies. This workshop is aimed at reviewing the existing power swing detection methods and scrutinizing their effectiveness in power systems with high penetration of Renewable Energy Sources.
Sadegh Azizi is an assistant professor at the University of Leeds dealing with protection and power system analysis topics
Protection concept AC connection Offshore
Presenter: Ernst Wierenga | TenneT
Abstract: Large amount of off shore wind generation requires new offshore substations. This presentation deals with a new protection concept of offshore substations in which the offshore AC connections will be presented. The design and implementation of the suitable protection systems and the philosophy behind applied solutions will be discussed. This comprises a concept of a robust, proactive testing tool and procedure to ensure interoperability, reliability, availability and maintainability of the protection system.
Ernst Wierenga is a protection engineer with Asset Management Offshore department of TenneT.
Ideal Line differential Protection supported by Smart cable guard
Presenter: Maarten van Riet | Alliander
Abstract: Last 17 years by Alliander are remembered by significant collaboration with other distribution utilities and DNVGL, Locamation and TU/e, the work of which resulted in the design and implementation of the so called Smart Cable Guard (SCG). SCG has been used with full success to monitor the partial discharges of cables in real time and to timely indicate where possible failures may take place. The developed technology can also be used for fault location based on traveling wave principle. The next generation of SCG will be also extended for line differential protection of cables and our experience shows that we can keep the total protection time (fault detection and fault elimination even with the existence of primary and secondary arc) below 100 ms. The advantage will be an easy step from star operating to mesh operating MV grid with much lower interruption time of energy supply. The system will be also applicable for HVDC protection. Sounds simple, but it is a great task that will be done jointly with the Dutch PSPC.
Maarten van Riet is a manager R&D for Liandon member of Alliander in the Netherlands.
Xie Hua is a researcher at NR Electric Co.Ltd, China
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