The Shell Petroleum Company of Nigeria Ltd is the largest producer of oil and gas in Nigeria, producing almost half of the country’s oil and supplying over 95% of its commercial gas.
Effective control of such enormous resources requires state of the art technology, which is why BRUSH PRISMIC® power management systems have been selected to control the high voltage electrical systems at Odidi Gas Gathering Plant and at Forcados Terminal, 44 km apart on the banks of the Forcados River.
The PRISMIC® system is a rack mounted, microprocessor-based control system with interface modules specially designed for power system control and load shedding applications. The human-machine interface (HMI) consists of an industrial PC and colour monitor, which provides the operator with a graphical user interface, allowing commands to be issued to the Prismic® and adjustments to be made to the control parameters. The HMI operates in the Windows NT environment, enabling mutitasking at each location.
Odidi Gas Gathering Plant takes gas from Odidi, Egwa and Batan/Ajuju Fields for compression and delivery into the Escravos Lagos pipeline system. The power management system, provided through Nuovo Pignone of Italy, will control a single generator and ten load feeders and will communicate with three remote substation load shedding units.
An interconnecting cable will run along the riverbed to allow communication with the PRISMIC® power management system at Forcados Terminal. This system, provided through Spie Enertrans of France, will control five generators and 16 load feeders. Both power management systems have been designed to accommodate future expansion.
The integration of the PRISMIC® systems at Odidi and Forcados will form a composite power management system controlling the isolated or combined high voltage power systems of both sites and providing the following salient features:
- Tapchanger control for two transformers.
- Monitoring and limiting the reactive power flow through the submerged cable link.
- Active and reactive power sharing between up to six interconnected generators.
- System voltage and frequency control.
- Selective load shedding in the event of loss of generation, loss of cable link, generator overload or system under frequency.
- Automatic starting and stopping of the site generators, with manual over-rides.