ELECTRICAL

ENGINEERING

At Varistor Engineering, our electrical engineering division is built on precision, innovation, and a deep understanding of renewable energy infrastructure. We deliver comprehensive electrical designs that enable high performance, maximum reliability, and seamless grid integration for utility-scale and C&I solar projects.


Our Electrical Engineering division provides complete design and analysis solutions for solar power plants, ensuring safe, efficient, and reliable power generation. We focus on developing optimized AC/DC systems, accurate simulations, and high-quality engineering documentation that meet all industry standards and utility requirements. Our team combines practical field experience with advanced tools to deliver designs that are technically strong, cost-effective, and easy to implement.

End-to-End Solar Electrical System Architecture

System Architecture Includes:

  • PV Module → String → Array → String Combiner Box → Inverter

  • Inverter → LT Panel → Step-Up Transformer → Switchyard → Transmission Line

  • Control Room → SCADA → Remote Monitoring → Utility Interface

Design Considerations:

  • Maximum energy yield

  • Minimum cable losses

  • Optimal equipment placement

  • Safety & regulatory compliance

  • Operational convenience & maintainability

Detailed DC Engineering

Services Include:

  • Module Mismatch & Soiling Loss Analysis

  • DC Cable Routing Optimization using terrain profile

  • DC Voltage Drop & Loss Calculation

  • String Combiner Box (SCB) / Array Junction Box (AJB) Configuration

  • Selection of DC Switches, SPD, Fuses, Connectors

  • Thermal derating factor calculations for DC cable sizing

  • AC/DC segregation & routing philosophy

Key Outputs:

  • DC SLD

  • PV array layout drawing

  • String mapping sheets

  • DC cable routing plan

  • DC combiner architecture

Advanced AC Engineering (LV/MV/HV)

AC Design Includes:

  • Inverter AC output system design

  • LT panel architecture

  • MV breaker selection & configuration

  • ACDB design including incomers, feeders & protections

  • Step-up transformer loading checks

  • HT switchgear design (VCB/GIS/Hybrid)

  • LT/HT cable sizing

High-Level Protection System Engineering

Protection Scope Includes:

  • Overcurrent & Earth Fault relays

  • Directional Overcurrent

  • Differential protection (Transformer/Feeder)

  • Busbar protection schemes

  • Under-voltage, Over-voltage, Frequency protection

  • Solar plant anti-islanding protection

  • Grid disturbance handling logic

  • Reverse power protection

  • SCADA-based alarming & trip command architecture

System Studies & Power System Analysis (Ultra-Deep Level)

Studies We Perform:

  • Load Flow (steady-state performance)

  • Short Circuit (fault current availability)

  • Arc Flash Hazard Study

  • Protection Device Coordination (TCC curves)

  • Harmonic Distortion & THD Analysis

  • Dynamic Stability Study

  • Fault Ride Through (FRT) capability study

  • Transient stability (for hybrid/ESS systems)

  • Flicker & Voltage Regulation Study

Electrical Infrastructure Layouts & Routing Engineering

Design Includes:

  • Cable trench routing

  • Trench cross-section design

  • Cable tray layouts

  • Conduit & duct bank design

  • Control room internal electrical layout

  • Auxiliary building electrical design

  • Fire alarm & safety system routing

High-Level Protection System Engineering

Plant Auxiliary Electrical Systems

  • Scope Includes:

  • AC auxiliary distribution board

  • DC distribution system

  • Battery capacity & discharge time calculation

  • DG-set backup system design

  • UPS system for critical loads

  • Lighting system (indoor/outdoor, lux calculations)

  • Emergency lighting & safety signage

  • Earthing pits & ring main design