In the safe operation of the power system, transformers, as core equipment, have a direct impact on the stability of the power grid through early diagnosis of internal faults.CZBYThe online monitoring system for transformer oil chromatography integrates chromatographic analysis technology and intelligent algorithms to achieve real-time monitoring and fault warning of dissolved gases in transformer insulation oil, becoming a key tool for modern smart grid maintenance. The following analysis will be conducted from three aspects: functional characteristics, technological advantages, and application value.

1、 Multi gas synchronous detection and precise fault location

Seven fault characteristics with full gas coverage

The system can simultaneously detect hydrogen gas（H₂), Carbon monoxide（CO）Carbon dioxide（CO₂), Methane（CH₄), Ethylene（C₂H₄), acetylene（C₂HSeven key gases, including ₂, cover typical fault types such as transformer overheating, arc discharge, and partial discharge. For example, when detectedC₂HWhen the concentration of ₂ suddenly increases, it can quickly lock the arc discharge fault, andCH₄ andC₂HThe collaborative analysis of ₄ can distinguish low-temperature overheating（<300℃) and high temperature overheating（>700℃）。

Real time monitoring and auxiliary diagnosis of trace moisture

The system integrates high-precision humidity sensors, which can synchronously monitor the moisture content in oil (accuracy)±1ppm）. Research has shown that when the moisture content in insulating oil exceeds30ppmAt this time, it will accelerate the aging of paper insulation, and the system will pass through moisture-The gas concentration correlation model can provide early warning of insulation degradation risks.

2、 Intelligent Algorithm and Fault Diagnosis Model

based onIECFault classification using the three ratio method

built-inIEC 60599Standard algorithm, through calculationCH₄/H₂C₂H₄/C₂H₆C₂H₂/C₂HThree sets of ratios are used to automatically generate a fault type diagnosis report. For example, the ratio combination is（0,1,0）At that time, the system determined it as a medium low temperature overheating fault with an accuracy of92%.

Dynamic Trend Analysis and Early Warning Mechanism

Using time series algorithm to continuously track gas concentration, whenHThe daily growth rate exceeds5ML/LOr the absolute gas production rate of total hydrocarbons is greater than6mL/Tianshi, the system automatically triggers a Level 3 warning (yellow)/orange/Red) and push it to the operation and maintenance platform. some500kVThe application case of substation shows that this mechanism reduces the time for fault detection from traditional methods72Shorten hours to4Within hours.

3、 Technical advantages and engineering adaptability

Anti interference design and high reliability

The system adopts a modular structure, with optical fiber transmission between sensors and hosts, effectively isolating strong electromagnetic interference from substations. Laboratory tests have shown that500kVIn the environment, the system signal-to-noise ratio is ≥45dBThe repeatability error of gas detection is less than3%.

Maintenance free and long-lasting design

The core chromatographic column is coated with nanomaterials, extending its service life to5Improved compared to traditional chromatography columns in the year3Twice. At the same time, the system supports online calibration function, and operation and maintenance personnel can complete parameter correction without stopping the machine, reducing annual maintenance costs60%.

4、 Application value and industry impact

The transformation from regular maintenance to condition based maintenance

The system replaces the traditional weekly manual sampling and testing mode, achieving every10Real time monitoring every minute. Taking a provincial power grid as an example, the annual planned power outage frequency of transformers has been reduced after application40%The direct economic benefits exceed2000Ten thousand yuan.

Certification guarantee that meets international standards

The system passes throughDL/T 722Guidelines for Analysis and Determination of Dissolved Gases in Transformer OilIEC 60599Certification, detection accuracy reaches μL/LGrade, meeting the strict requirements of equipment monitoring for ultra-high voltage engineering.

Conclusion

CZBYThe online monitoring system for transformer oil chromatography integrates multi gas detection, intelligent diagnosis, and anti-interference design to construct a complete closed-loop for transformer fault warning. Its technical indicators have reached international standards, providing key support for the transformation of power equipment from "planned maintenance" to "predictive maintenance", and having important strategic significance for ensuring the safe operation of the power grid.