Online DGA System | Consumable-Free Transformer Monitoring

Effective transformer maintenance relies on accurate Dissolved Gas Analysis. Fault gases in the insulation oil serve as early indicators of incipient electrical or thermal issues.

Our online DGA utilizes a sophisticated closed-loop system to extract, analyze, and return oil without any atmospheric contamination, ensuring the integrity of your critical power assets.

Sampling

An automated oil pump extracts a representative sample from the transformer valve. This 24/7 real-time monitoring eliminates manual errors and provides immediate data logging.

Vacuum Degassing

The oil is processed in a chamber maintained at 67°C under extreme negative pressure. A magnetic stirring rod accelerates the release of all 9 fault gases and moisture for precise detection.

Re-injection

After multi-gas analysis, the treated, dehydrated oil is pumped back through the return port. This physical extraction process requires no carrier gases or consumables.

Below is the interactive vacuum degassing schematic for our online DGA.

Online DGA: Closed-Loop Vacuum Degassing

Pump Speed

Vacuum Level

The Advantages of Vacuum Degassing in Online DGA

Unmatched Consistency & Data Accuracy

Based on Henry's Law, the system utilizes a high-vacuum environment combined with a precise 67°C constant temperature. This controlled process ensures an identical degassing rate and absolute precision for fault gas analysis.

100% Physical Extraction & Zero Consumables

Unlike traditional methods relying on carrier gases, Hertzinno's vacuum degassing uses pressure differentials created by an internal pump. This eliminates the need for high-pressure cylinders, achieving maintenance-free operation.

Oxygen-Free Environment Prevents Oil Oxidation

Vacuum degassing occurs within a sealed, near-absolute vacuum chamber. Because the oil is heated in an oxygen-free environment, it retains its chemical integrity, allowing safe re-injection with zero degradation.

Rapid Gas-Liquid Separation for Shorter Cycles

Under high-vacuum, fault gases rapidly coalesce into bubbles. Continuous physical stirring exponentially accelerates extraction speed, allowing the system to complete a full cycle in under 1 hour.

Low Sample Volume & Compact Footprint

The efficiency of vacuum extraction means only a minimal volume of oil is required. This reduces the size of the degassing chamber, resulting in a compact monitor that can be installed directly on transformer valves.