Background
Ibn Khaldoun Substation is a Gas Insulated Substation 9GIS) designed to support 230 kV transmission lines. GIS technology offers a compact and reliable solution for high-voltage substations, but it also represents unique challenges, particularly concerning very fast from overvoltages (VFFO). VFFOs are high-frequency voltage surges that occur during switching operations or fault conditions, such as the operation of disconnect switches or circuit breakers. These transients can reach magnitude of up to 2-3 times the system voltage, with risk making them extremely fast and steep.
Challenge
The high-frequency nature of VFFOs presents significant challenges for GIS. These transients can include severe insulation stress, potentially leading to premature aging or failure of critical GIS components. Additionally, the rapid voltage surges can cause electromagnetic interference, affecting nearby equipment. The generation of VFFO is primarily attributed to the rapid breakdown of the dielectric gas (typically SF6) and the subsequent re-striking of arcs during switching operations. Effectively understanding and mitigating VFFO is essential for ensuring the reliability and longevity of GIS systems. Without adequate protection, these transients can compromise system performance, increase maintenance costs, and impact the overall stability of the power network.
Approach
To address the challenges posed by VFFO, EPE collaborated closely with the client to develop a frequency-dependent traveling wave model of the electrical substation.
Solution
These specialized models are essential for accurately simulating high frequency, short duration transient phenomena, enabling a precise analysis of the substation’s response to VFFO events. In addition to model development, EPE conducted comprehensive simulation scenarios, evaluating various operational conditions to assess the full spectrum of transient overvoltage events the facility might encounter. By analyzing switching operations, fault conditions, and potential worst-case scenarios, EPE provided valuable insights into mitigation strategies, ensuring the long-term reliability and stability of the GIS system.
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