The Supervisory Control and Data Acquisition (SCADA) system is a powerful tool for controlling and monitoring industrial processes. In order to ensure that a SCADA host station is properly designed and installed, there are several important electrical and wiring considerations that must be taken into account. This article will provide an overview of the electrical and wiring requirements for a SCADA host station, including electrical power requirements, grounding, marshaling cabinets, fiber optics data communication cables, and power supply.
This article is referenced from international codes and aramco SAES-Z-004.
Electrical and Wiring Requirements
The electrical and wiring up to but excluding vendors’ standard cabinets should be designed in accordance with Saudi Aramco Engineering Standard SAES-J-902. Additionally, the electrical power requirements and grounding and marshaling cabinets for the SCADA host station should be in accordance with 34-SAMSS-820, while the electrical power requirements and grounding for the Remote Terminal Unit (RTU) cabinets should be in accordance with 34-SAMSS-821.
Power Supply
For SCADA systems, it is important that the equipment can tolerate a loss of power of 100 milliseconds without any damage, mal-operation or data corruption. Additionally, the SCADA equipment designated as ‘indoors’ should carry the CE mark for compliance with the European EMC Directive 2004/108/EC, or should comply with immunity levels stated in IEC 61000-6-2. An alternative option is for the vendor to provide testing results to prove that the equipment will operate without disturbance when energized and subjected to an electromagnetic field from a radiating source equivalent to a level 3 disturbance as detailed in IEC 61000-4-3.
Fiber Optics Data Communication Cables
For fiber optics data communication cables, the requirements and design should be in accordance with SAES-Z-020. Additionally, for control room equipment, two separate, independent, electric circuits should be supplied to power the redundant modules. If a simplex Uninterruptible Power Supply (UPS) is provided, one of the feed to system redundant power modules should be supplied from a raw 120 VAC power feed.
Labeling and Identification
In order to ensure that the electrical system is properly designed, all instruments, push-buttons, switches, lamps, cabinets, and workstations should be identified with tag numbers and service descriptions. The nameplates should be permanently attached using screwed plates or equivalent. Additionally, the branch circuits or power cords to redundant modules should be clearly labeled, so they can be identified easily.
Conclusion
Designing an electrical system for a SCADA host station requires careful consideration of a variety of electrical and wiring requirements. The electrical and wiring should be designed in accordance with Saudi Aramco Engineering Standard SAES-J-902, while the electrical power requirements and grounding should be in accordance with 34-SAMSS-820 and 34-SAMSS-821. Additionally, the SCADA equipment should be able to withstand a loss of power of 100 milliseconds, and must carry the CE mark or comply with immunity levels stated in IEC 61000-6-2. Finally, all instruments, push-buttons, switches, lamps, cabinets, and workstations should be identified with tag numbers and service descriptions with permanent nameplates. By following these guidelines, you can ensure that your SCADA host station is properly designed and operated.
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