Case of JIFCO, Jordan
IFFCO and Jordan Phosphates Mines Company Ltd (JPMC), Jordan had formed a Limited Liability Joint Venture Company, namely Jordan India Fertiliser Company (JIFCO) in Eshidiya, Amman, Jordan. Plant has in-house thermal based generation of 30MW at 11kV through STG. Mill is also having the local utility power support at 33kV from NEPCO. JIFCO referred theirproblem of cascade tripping of CPP in event of grid side disturbances and resulting in to complete black out of the plant in early 2016. EEPL was awarded for Power System Study job in Mid-2016. EEPL Senior Executives visited the site for data collection including visit to NEPCO 132/33kV S/s.
EEPL conducted Power System Study using etap software and submitted their detailed Power System Study Report narrating their observations and recommendations for improvement of system reliability. EEPL conducted the Transient Stability Analysis andDetailed Engineering for Grid Islanding Scheme including suggestions for the installation of dedicated Grid Islanding Relay Micom P341. EEPL also did the detailed engineering for proposed Load Shedding Scheme considering existing numerical relays only. Load shedding scheme was designed based on Simple Open Loop Logic having faster operation and very cost effective solution.
EEPL prepared the Task Schedule, SOP and check list for the implementation work to be carried out at site within 72 Hours of shutdown. In January 2017implementation work was carried out jointly by the EEPL’sExecution team, Engineering team andJIFCO Staff. In broad spectrum it includes installation of Grid Islanding Relay and Load Shedding Panels. Settings and Configuration of Relays, Testing of CTs and Relays, Sensitivity and Stability Checks of Differential and REF Schemes, Simulation of Tripping and Annunciation Circuits, Simulation of Load Shedding Scheme. EEPL extended their support for plant start-up after completion of afore mentioned work and observations for next 2 days till plant got running on its full capacity. Also JIFCO team was trained for basic operating of these relays and for trouble shooting and start-up procedure followed by tripping of relays, if any.
After above implementations at site in event of grid side disturbances, end result now got changed drastically and is now more favourable to plant. Now followed by any such grid disturbance, CPP is getting islanded from grid successfully, surplus load shedding also take place in time and STG sustains with balance of critical plant load. As a result effective plant down time has reduced drastically and plant production loss is prevented. The most importantly this gives complete peace of mind to the operation staff and electrical team in particular.