Session 5: EMI from a prime contractor’s point of view
Many prime contractors or designers and developers of complex systems do not design and develop the equipment which they integrate into the final system. As such they have to develop specifications which control all the electromagnetic effects with which the equipment has to cope. These include the traditional EMC susceptibility and emission requirements. In addition, there are a growing number of other electromagnetic effects, including electrostatic charging, induced effects of Lightning, intentional electromagnetic interference etc. Prime contractor organisations also have a responsibility to ensure that systems architecture and installation is designed to ensure that equipment qualification limits are not exceeded.
This session provides an opportunity for speakers to present their approaches to the development of such specifications and systems design, including the responsibility of the prime contractor or integrator to demonstrate the complete system operates safely without electromagnetic incompatibility and without significant disturbance in the presence of an external electromagnetic environment (e.g. High powered radio or radar transmitters or Lightning).
Session 5, Speaker 1
Dr Dena Servatian and Richard B Williams, of Atkins Rail Ltd
EMC Integration on Major Rail Projects
Progressive Electromagnetic Compatibility (EMC) assurance forms a vital part of any overall project life cycle. Documentation may be used to establish a variety of technical requirements, define the legal responsibilities as well as identify general best practices for those involved, thus evidencing that EMC has been considered and implemented where applicable.
When considering the challenges of a complex major railway project, the level of EMC assurance required can increase substantially. Stakeholders, operators, designers and contractors must all be able to clearly understand and execute their duties, from effective coordination during the design and construction phases, right through to maintaining the safe and effective operation of any systems. For complex projects, electrical systems modelling can act as a key element in ensuring the adequacy of EMC controls for the railway; providing designers with a range of design parameters and operational constraints that are necessary to ensure EMC of the final system.
This paper will focus on how EMC is controlled, managed and executed within the context of major rail electrification projects, and highlight how EMC assurance has evolved in line with recent changes to the rail delivery framework process . It defines the various documents and activities which are mandated throughout the project life cycle to achieve EMC assurance under the relevant legislations and standards.
Session 5, Speaker 2
Martin Grant, Ian Flintoft, Darren Hayes, Les McCormack, of Atkins
Generic Design Stage EMC Assurance for Nuclear Power Plants
The management and control of Electromagnetic Interference (EMI) is one of the key safety assessment principles that is relevant to nuclear licenced sites. A robust assurance process should be established at the outset of the Generic Design Assessment (GDA) that can be further developed and followed throughout the project lifecycle.
In an environment as complex and harsh as a nuclear power plant, EMI is a key hazard that must be considered as part of the internal and external hazard assessment process, particularly where it could lead to a radiological release. As well as the impact on safety critical and safety related systems, EMI must also be considered for other systems where there are secondary safety concerns as it could affect the response to other hazards.
This paper explores the Electromagnetic Compatibility (EMC) assurance process during GDA Step 3 and 4 of a new nuclear power station, including the management of functional safety requirements to ensure electromagnetic resilience. It also discusses EMI in the context of the internal and external hazard assessment process for the GDA, with the latter of these also considering the effects of a severe space weather event.
Session 5, Speaker 3
Dr Alex Gavrilakis, BEng (Hons), MSc, PhD, CEng, SMIEEE, MIET, Senior Design Engineer (EMC), Network Rail
EMC requirements for railways, an infrastructure owner’s perspective
This paper discusses the EMC requirements instructed by the main UK infrastructure owner, Network Rail, to the designers and constructors of new railway projects.
It provides guidance on the level of EMC assurance documentation expected from the projects, based on their assigned level of EMC risk.
It also highlights which requirements shall be coordinated with third parties such as local neighbours and train operating companies.
Although this paper focuses on railways, it could inform and/or be adopted by other industries.
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