Mining and mineral processing operations depend on stable electrical systems to maintain production in remote and often weak-grid environments. Heavy applications such as SAG and ball mills, overland conveyors, electrowinning circuits, desalination systems, and high-lift pump stations place extreme demands on mine power systems through large motors, cycloconverters, VFDs, DC rectifiers, and long electrical distribution networks.
Addressing Mining &
Extraction Power Challenges
Advanced Mitigation for Complex Harmonics
Large drive systems, including cycloconverters and VFDs, create complex harmonic environments involving both integer and non-integer frequencies. VarStec designs advanced High-Pass (HP), C-Type High-Pass (C-HP), and Notch Filter solutions engineered for these applications to control harmonic distortion and prevent resonance while supporting strict compliance with IEEE 519, IEC requirements, and utility interconnection standards.
Power Factor Correction for Electrowinning & Desalination
Electrowinning processes for copper, zinc, and precious metals depend on large DC rectifiers that can create poor power factor and objectionable harmonics. Furthermore, desalination systems and high-lift pump stations, essential for mine operations in arid regions, place significant reactive power demands on weak networks. We provide custom metal-enclosed harmonic filter banks to improve power factor, support system voltage, and strengthen overall electrical stability across these critical infrastructure loads.
High-Altitude Dielectric Design & Optimization
Mining operations frequently occur at extreme elevations where reduced air density lowers the dielectric withstand capability of standard switchgear. VarStec uses a proprietary Altitude Derating & Insulation Coordination Tool to prove that standard or lower Basic Insulation Levels (BIL) equipment can often be safely protected at altitude through coordinated surge arrester application. This rigorous engineering approach avoids the automatic blind upsizing of insulation, leading to significant cost savings and a smaller physical footprint.
How VarStec Helps
Filter Design & Harmonic Compliance Studies
With more than 30 years of experience in mining applications, VarStec provides comprehensive filter design, harmonic compliance, and power factor studies as part of our equipment supply. Using industry-accepted harmonic analysis software, we provide the system analysis and equipment expertise needed to deliver a technically correct and correctly applied filter system.
Engineering for Harsh & Remote Environments
VarStec systems are engineered for the world’s most demanding environments, including dust, humidity, high solar loading, and corrosive atmospheres. Our outdoor-rated, metal-enclosed designs provide a rugged, application-specific solution that improves long-term reliability and can reduce the need for costly E-House installations.
Unbundling the Drive Package for Cost Optimization
When purchasing large ASD or cycloconverter systems from major OEMs, filters are often included as a secondary package item. While these OEMs are experts in drives, they are not necessarily specialists in harmonic filter manufacture. By sourcing filters directly from VarStec, mine operators and their EPCs place critical power quality components in the hands of dedicated filter experts while achieving significant cost savings.
Precise Insulation Coordination
To maximize the protective benefits of surge arresters at high altitudes, VarStec design practice strives for less than 1 foot of total lead length. By accurately calculating inductive voltage drop and coordinating protective margins, we ensure that transient overvoltages remain within the safe dielectric capability of the equipment without unnecessary insulation upgrades.