A practical guide to designing MV substations for data centre power connection, covering protection schemes, redundancy strategies, and regulatory requirements.
Data centres are among the most power-intensive facilities in modern infrastructure. Connecting them reliably to the medium voltage (MV) grid requires careful substation design, reliable protection schemes, and well-considered redundancy strategies.
A typical data centre MV substation must handle the full load of the facility while maintaining uptime guarantees of 99.999% or higher. This demands ring-bus or double-busbar topologies, differential protection relays, and automatic transfer switching capable of sub-cycle response times.
Regulatory requirements vary by jurisdiction, but most markets require compliance with IEC 61850 for communication between protection devices, and IEC 62271 for switchgear ratings. Designers must also account for harmonic distortion introduced by large UPS systems and variable-speed drives, which can cause nuisance tripping if protection settings are not calibrated accordingly.
