Data centers place exceptional demands on electrical infrastructure as facility capacity, rack density, and AI computing loads continue to increase. UPS systems, power-electronic loads, VFD-driven cooling equipment, and rapidly changing load profiles can create challenges involving harmonic distortion, reactive power demand, voltage regulation, and switching transients. Addressing these issues at the medium-voltage level helps preserve system capacity, equipment reliability, and overall facility resilience.
Addressing Data Center Infrastructure Challenges
Harmonic Mitigation for High-Density Loads
Large UPS input rectifiers, variable frequency drives (VFDs), and other power-electronic loads can introduce significant harmonic currents into the upstream electrical system. VarStec’s custom-engineered harmonic filter banks are designed to control harmonic distortion at the medium-voltage level, support compliance with IEEE 519 and applicable IEC requirements, and reduce harmonic loading on transformers, switchgear, cables, and other electrical equipment.
Dynamic Reactive Power & Voltage Support
Data center loads can change rapidly, particularly in high-density and AI computing environments. VarStec combines medium-voltage capacitor banks with hybrid STATCOM solutions to provide both steady-state reactive power compensation and fast dynamic support. This approach helps maintain power factor, support voltage stability, reduce stress on the electrical system, and maximize available infrastructure capacity as facility loads change.
Transient-Free Capacitor Bank Switching
Traditional capacitor switching can introduce high-frequency transients and inrush currents that threaten sensitive data center equipment. VarStec addresses this by incorporating Advanced Switching Technology, including the VD4-CS and VD4-CS1 platforms from ABB. These technologies utilize high-resolution, point-on-wave control to achieve transient-free and restrike-free switching.
How VarStec Helps
Advanced Switching with ABB VD4-CS & VD4-CS1
By integrating VD4-CS and VD4-CS1 servomotor-controlled switching into our designs, VarStec provides a solution that eliminates the need for traditional inrush mitigation and fast-discharge devices. This advanced technology allows for:
- Controlled Inrush-Free Switching: High-accuracy synchronized switching minimizes capacitor-bank energization transients, while the VD4-CS1 enables controlled switching independent of capacitor charge status.
- Restrike-Free Disconnection: Controlled opening eliminates the probability of reignitions and restrikes, protecting the system from high-voltage disturbances.
- High-Endurance Operation: The maintenance-free, brushless servomotor technology provides high reliability in extreme environments and an extended operational lifespan.
Simplified Electrical Layout & Footprint Savings
The use of advanced switching technology allows for a significantly reduced equipment footprint by removing the need for additional mitigation components like inrush reactors.
System-Fit Engineering & Reliability
We do not offer one-size-fits-all catalog equipment. Using detailed system data and field measurements, VarStec performs comprehensive load-flow and harmonic analysis studies. This engineered approach ensures that the final medium-voltage solution is technically correct and optimized for the unique operating goals and physical constraints of each data center project.