Technical Guide – Switching AVO Electro Power Ltd.
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August 20, 2025

Technical Guide – Switching AVO Electro Power Ltd.

1. Understanding Power Quality

What is Power Quality? Power quality refers to the stability and purity of electrical power supplied to devices. Poor power quality can damage equipment, reduce efficiency, or lead to system failures.

Common Issues:

  • Voltage Sags & Swells
  • Harmonics Distortion
  • Frequency Fluctuations
  • Electrical Noise and Surges
  • Impact on Equipment:
  • Motor failures, overheating
  • Data corruption
  • False triggering of protection devices
  • Higher energy losses

Solution: Deployment of quality UPS systems, harmonic filters, isolation transformers, and voltage stabilizers.

2. Classification of UPS Systems

Offline/Standby UPS (VFD)

  • Simple, cost-effective
  • Only activates during power loss
  • Suitable for PCs, small devices

Line-Interactive UPS (VI)

  • Offers basic voltage regulation
  • Some protection against brownouts/surges

Online Double Conversion UPS (VFI)

  • Continuous power regulation
  • Eliminates voltage/frequency fluctuations
  • Ideal for industrial, medical, and IT environments

Applications:

  • Industrial CNC machines
  • Hospitals and labs
  • Server rooms & data centers
  • Telecom installations
  •  

3. Key Components of an Online UPS

  • Rectifier: Converts AC to DC
  • Inverter: Converts DC back to clean AC
  • Battery Bank: Backup energy storage
  • Static Bypass Switch: Ensures power continuity during UPS faults
  • Control System: Regulates switching and monitors performance

4. Modular vs Conventional UPS Architecture

Conventional UPS:

  • Monolithic design
  • Single point of failure
  • High MTBF, slower service

Modular UPS:

  • Hot-swappable modules
  • Scalable on demand
  • Lower MTTR (Mean Time to Repair)

Recommendation: Use modular systems for critical load environments needing redundancy and scalability.

5. UPS Sizing & Selection

Key Factors:

  • Total Load (in kVA or kW)
  • Backup Duration (battery autonomy)
  • Load Type (linear or non-linear)
  • Redundancy requirements (e.g., N+1, 2N)
  • Physical space and environment (temperature, humidity)

Tools Used:

  • Load calculators
  • Site audits and electrical data analysis
  • Vendor consultation
  •  

6. Static Transfer Switch (STS)

Purpose: An STS allows automatic transfer of electrical load between two sources (UPS A and UPS B) with near-zero transfer time.

Benefits:

  • Increased power source reliability
  • Isolated fault paths
  • No downtime during source switch
  • Ideal for dual-redundant power systems

Use Cases:

  • Data centers
  • Hospitals
  • High-availability industrial operations 

7. Servo-Controlled Voltage Stabilizers

  • Why Needed? In areas with fluctuating input voltage, stabilizers ensure consistent voltage delivery to protect critical equipment.

Types:

  • Air-cooled Servo Stabilizers
  • Oil-cooled Servo Stabilizers

Features:

  • Output voltage regulation within ±1%
  • Protection against surge, under/over-voltage
  • Customizable for 1-phase and 3-phase setups

Industries Benefiting:

  • Textiles
  • Pharmaceuticals
  • Manufacturing
  • Logistics & warehousing
  •  

Summary Navigation Structure

  • Technical Guide
  • ├─ Power Quality: Causes & Solutions
  • ├─ UPS Types: Offline, Line-Interactive, Online
  • ├─ Components of Online UPS Systems
  • ├─ Modular vs Traditional UPS Design
  • ├─ How to Choose the Right UPS
  • ├─ Role of Static Transfer Switches
  • └─ Voltage Stabilizers for Industry

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