Low Voltage Switchboard (415VAC)
We were awarded a brownfield project to replace existing low voltage (415VAC) switchboards at two substations in an oil & gas terminal, including starter panels consisting of DOL starters, soft starters and variable speed drives. The replacement exercise was a complicated endeavour as the terminal was an operating terminal and could not be de-energised for more than 12 hours. The scope of work involved the design, engineering, fabrication, supply, installation, testing and commissioning of the new switchboards. It also involved the decommissioning and dismantling of the existing switchboards. Due to the age of the existing switchboards and the lack of drawings, our engineers tirelessly traced circuits and produced the necessary drawings for the new switchboards. At the same time, since the field cables were to remain and could not be jointed, the cubicles of the new switchboards had to correspond with the footprint of the existing switchboards. Space constraints within the substation also meant that the new switchboards had to be brought into the substation in modules and assembled at site. CANS managed to complete the replacement of both switchboards within the permitted timeframe and to the complete satisfaction of the customer, without any impact to the terminal operations.
Centralised Electricity Monitoring
CANS was awarded a contract to design, engineer, program, test and commission an electricity distribution monitoring system for a healthcare facility. The system acquired data from electrical devices such as relays, transformers, switchgears, power meters, power quality meters, etc. to monitor the performance of the electrical network. It consisted of PLCs, gateway devices and a central SCADA workstation which provided control and monitoring functions to operations and maintenance personnel.
We were selected to implement a substation monitoring system for several 33kV and 132kV substations which supplied power to an oil refinery. The substation monitoring system consisted of dual redundant PLCs, SCADA workstations, SCADA servers, networking systems and I/O cabling. Each substation was equipped with a SCADA workstation which was connected to a centralised SCADA server. Data that was monitored include status and readings from relays, transformers, switchgears, power meters, power quality meter, etc.
Oil insulated underground high tension power cables are common in certain parts of the world. However there are instances where the oil can leak, causing catastrophic failure of the cables resulting in power outages. We were contracted to design and build a custom embedded board which was installed in cable pits to measure oil pressure in cables via strain gauges. This board, which is capable of various methods of wireless and wired communication, was interfaced to a control centre to continuously monitor the oil pressure in cables. Any anomalies could be easily identified and measures would be taken to repair the cable in a managed manner, thereby reducing unplanned outages and maintenance works.