Retrofitting and Modernization of Conventional Substation to An IEC 61850 Based Automated Substation - A Case Study of 400KV Amreli Substation

摘要

IEC 61850 as an acceptable universal standard has been currently widely practiced by utilities across the world. GETCO has adopted IEC 61850 based SAS with Yard Kiosk concept for all new projects due to discrete features like interoperability, expandability, long term stability and its ability to facilitate flexible data communication. At 400kV Amreli substation, IEC 61850 standard applications are also utilized for retrofitting and modernization of substation along with accommodation of new bays. There were infrastructure constraints regarding extension of control room and related civil works. But, having enough experience of IEC 61850 based SAS with Yard Kiosk concept, we extended our thought process favourably towards adoption of this concept to overcome infrastructure constraints as well as take advantage of investment in terms of long term O&M cost savings. To achieve automation of complete substation, it was essential to convert existing system to IEC 61850 compliant. Accordingly, retrofitting requirements were finalized with micro level planning by covering all the major aspects right from panels to switchgears and AC-DC auxiliaries. During initial stage, engineering challenges regarding Retrofitting modality, Matching schemes, Replacement of Bus bar scheme and Utilization of IEC 61850 standard applications for Control, Interlocking and Protection were faced. All these challenges were resolved iteratively with detailed analysis and finalization of engineering by deriving Retrofitting modality, Detailed roadmap for sequence of the activities and IEC 61850 application based interfaces for new as well as existing bays. Also, during execution stage some surprises were cropped up like TBC and BC bay interfaces during transition stage, Requirement of reverse engineering for retrofitting and Data to SLDC during transition period. These surprises were tackled with special planning like special interface panel for TBC and BC interfaces, Pilot bay retrofitting as a base and Integrating Gateway and RTU data. There were further challenges in field regarding availability of outages and coordination thereof for retrofitting. All these challenges were resolved with coordinated planning for result oriented solutions. Some of the lessons are also learnt followed by deriving a set of methodologies/modalities which will be helpful for future similar projects. As a whole, paper shares experiences of retrofitting & modernization of conventional substation to an IEC 61850 based automated substation along with accommodation of new bays in switchyard and also explains as to how IEC 61850 standard applications has helped in achieving the purpose.