Difference between Transformer Oil Chromatography Monitoring System and Oil Spectroscopy Analysis: In-depth Analysis and Application Guide

• The core difference: Transformer oil chromatography mainly detects the dissolvedtrace gas(used to diagnose sudden or latent discharges, overheating faults), while oil spectroscopy primarily detects the oil itselfMolecular structure and chemical composition(Used to assess the overall degree of aging and deterioration of insulating oils).

• Monitoring of timeliness and application patterns: Transformer oil chromatography monitoring systems are now highly sophisticated and commonly used on a 24-hour basis.Online monitoring, focusing on real-time safety alerts; transformer oil spectral analysis currently relies on laboratoryOffline periodic testing, focusing on the medium and long-term assessment of the remaining life of the insulation system.

• diagnostic valueIn power equipment operation and maintenance, oil chromatography is an “emergency indicator” to capture equipment abnormalities (to see if they are sick), while oil spectroscopy is a “physical examination indicator” to reflect the health of the insulating paper and oil (to see how the physical condition is), and they are not interchangeable.

Dissolved Gas Analysis (DGA) of Transformer Insulating Oil: Working Principle and Troubleshooting of Oil Chromatography Online Monitoring System

The core technology of the transformer oil chromatography monitoring system is Dissolved Gas Analysis (DGA). During the operation of large power transformers, if latent faults such as localized overheating, arc discharge or partial discharge occur within the transformer, the insulating oil and solid insulating materials (such as insulating paper) will be cracked under the action of thermal and electrical stresses.

The cracking process produces specific characteristic gases, mainly hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO) and carbon dioxide (CO2). The Oil Chromatography Monitoring System separates these gases by means of a gas chromatograph and accurately measures their concentrations and gas production rates. By analyzing the proportions of the components of these gases (e.g., the classic three-ratio method), O&M engineers can accurately determine the type of fault. For example, the presence of acetylene is usually hard evidence of a high-energy arc discharge, while abnormally high levels of carbon monoxide and carbon dioxide often point to severe overheating of solid insulation materials. A modern oil chromatography online monitoring system enables real-time data to be transmitted remotely, and is the first line of defense in preventing sudden transformer explosions or downtime accidents.

Transformer Insulating Oil Aging Test and Chemical Deterioration: Technical Advantages of Oil Spectral Infrared Analysis

The focus of transformer oil spectroscopy (usually referred to as Fourier Transform Infrared Spectroscopy FTIR or UV-Visible Spectroscopy techniques) is not on free gases, but on the chemical bonding and molecular state of the insulating oil itself. Insulating oils undergo chemical deterioration reactions such as oxidation and polymerization when subjected to high temperatures, oxygen and electric fields for long periods of time.

By spectral infrared analysis, different chemical functional groups have different absorption summits for specific wavelengths of infrared light. This technique is extremely sensitive in insulating oil aging tests. It can accurately quantify the trace moisture in the oil, the residual amount of antioxidants (e.g. T501/BHT) consumed, as well as the acidic derivatives produced by aging. What's more, spectral analysis can efficiently detect the amount of “furfural” in the oil - the only characteristic product of cellulose degradation of insulating paper - and is the gold standard for evaluating the degree of aging of solid insulation in transformers and predicting the remaining life of the equipment.

Preventive testing and condition maintenance strategies: core differences between chromatography and spectroscopy in power equipment operation and maintenance

In order to better develop the transformer condition maintenance strategy, we need to clarify the specific differences between these two preventive test means in practical application:

Building a multi-dimensional transformer condition monitoring system: combining temperature monitoring with Inotera's specialized solutions

Whether it is the surge of characteristic gases reflected in oil chromatography or the accelerated aging of insulating materials revealed by oil spectroscopy, the core triggers behind them are often inseparable from temperature anomalies.. Localized overheating and winding temperature rise inside the transformer are the direct drivers of gas production from insulating oil cracking and sudden drop in insulating paper life. Therefore, it is not enough to rely on a single oil-phase index, and it is important to build a system that covers oil chromatography, oil spectroscopy, andThe multi-dimensional diagnostic system of high-precision transformer temperature online monitoring** is the EEAT standard operation and maintenance strategy that meets the high reliability requirements of modern power grids.

In the field of transformer temperature monitoring and safety warning, INNOTD is committed to providing professional and accurate online temperature monitoring solutions for the industry. Combined with INNOTD's fluorescent fiber optic temperature measurement system and other advanced sensing technologies, operation and maintenance personnel can directly obtain the real-time physical temperature of transformer winding hot spots. In-depth cross-validation of INNOTD's precise temperature data with the gas production trend of oil chromatography and the aging index of oil spectra can fundamentally realize the early warning and accurate positioning of latent transformer faults, maximize the operating life of the equipment, and safeguard the absolute safety and stability of the power system.