AIGCS in OLTC Demystified: Expert Tips to Detect and Clear Insulation Gases

 On-Load Tap Changers (OLTCs) operate under high electrical and mechanical stress, making insulation health a critical factor in transformer reliability. One hidden but serious threat to OLTC performance is the accumulation of insulation gases. EMR Global’s AIGCS (Air Injection Gas Control System) is designed to detect, control, and safely clear these gases before they cause operational failures.

This article explains how AIGCS works in OLTCs and provides expert tips to identify and manage insulation gases effectively.

Why Insulation Gases Form in OLTCs

During tap-changing operations, electrical arcing occurs inside the diverter switch. This arcing decomposes transformer oil, generating gases such as hydrogen, methane, and acetylene. If these gases accumulate, they can:

  • reduce dielectric strength

  • interfere with oil circulation

  • cause erratic OLTC switching

  • increase explosion or flashover risk

  • trigger unwanted protective trips

Without proper gas management, these issues can quickly escalate into major outages.

What Is AIGCS and How Does It Work?

AIGCS is a controlled gas management system installed on OLTC compartments. It continuously monitors gas buildup and injects measured air volumes to displace accumulated gases safely. EMR Global’s AIGCS ensures that gas concentration remains within safe limits, maintaining stable insulation conditions.

Key functions include:

  • automatic detection of excessive gas formation

  • controlled air injection for gas evacuation

  • pressure stabilization inside the OLTC chamber

  • prevention of gas pockets near critical contacts

Expert Tips to Detect Insulation Gas Issues Early

  1. Monitor OLTC Operating Behavior
    Delayed or irregular tap changes can indicate gas interference.

  2. Track Oil Test Results
    Rising dissolved gas levels in OLTC oil are early warning signs.

  3. Inspect Pressure Relief Indicators
    Frequent activations suggest abnormal gas accumulation.

  4. Review AIGCS Alerts and Logs
    Smart AIGCS systems provide valuable diagnostic data.

Best Practices to Clear and Control Insulation Gases

  • install AIGCS during OLTC commissioning or retrofit

  • combine AIGCS with routine oil filtration

  • ensure periodic inspection of injection valves and sensors

  • integrate AIGCS status with transformer protection systems

  • use genuine OLTC spares to maintain sealing integrity

These practices significantly reduce the risk of gas-related OLTC failures.

Why EMR Global Leads in OLTC Gas Management

With decades of OLTC expertise, EMR Global designs AIGCS solutions that seamlessly integrate with existing transformer systems. EMR’s solutions enhance safety, reliability, and long-term performance.

Protect Your OLTC Systems With EMR Global AIGCS

Prevent insulation gas buildup and improve OLTC reliability using EMR Global’s advanced AIGCS solutions, spares, and services.

Contact EMR Global today to safeguard your transformers and ensure uninterrupted voltage regulation.

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