What are the advantages of transformer oil chromatography online monitoring system

Transformer oil chromatography online monitoring system as a core technology to ensure the safe operation of the transformer, its advantages are centered onReal-time, Preventive, Economic and IntelligentFour dimensions that can effectively make up for the shortcomings of traditional offline testing, which can be summarized in the following six core advantages:

Traditional offline inspection requires periodic outage sampling (usually once every 3-6 months), there is an obvious "time interval blindness", which may miss the critical signals in the budding period of the fault. The online monitoring system can24-hour uninterrupted operationThe on-line system can be used to collect data of dissolved gases in transformer oil in real time, which can capture the slightest change of gas content at the first time, avoiding "missed judgment" or "delayed discovery" of faults due to the long detection period. For example: when early partial discharge occurs inside the transformer, the online system can detect the rising concentration of hydrogen (H₂) and methane (CH₄) within a few hours, while offline detection may need to wait until the next sampling, when the fault is already likely to expand.

The nature of internal transformer faults (e.g. overheating, partial discharges, insulation breakdown, etc.) is the process of decomposition of insulating oils and solid insulating materials, which generates characteristic gases (e.g. acetylene C₂H₂ corresponds to arc discharges, ethylene C₂H₄ corresponds to high temperature overheating). The on-line monitoring system can be used in the fault development ofinfancy(when the gas concentration is far from the alarm threshold of offline detection), the abnormalities are identified through trend analysis, and the warning is issued weeks or even months in advance compared with the traditional method, reserving sufficient time for maintenance for operation and maintenance personnel, and shifting from "after-the-fact maintenance" to "preventive maintenance". For example, in a 220kV main transformer, a localized overheating caused by multi-point grounding of the iron core occurred inside the transformer, and the on-line system issued an early warning 2 months in advance through the slowly rising trend of methane and ethylene concentration, avoiding a major accident of iron core burnout.

Offline testing requires sampling the transformer after it is taken out of service, which affects the reliability of power supply to the grid, especially for the main transformer of hub substations and large power plants, and the loss of power outage is great. Online monitoring system throughelectrified sampling(real-time extraction of trace oil samples from the transformer oil circulation circuit), without interrupting the operation of the equipment, fully adapted to unmanned substations, important load power supply scenarios, significantly improve the continuity and stability of power grid operation.

The online system automatically stores historical monitoring data (including gas concentration, temperature, pressure, etc.) and supportsLong-term trend analysisrespond in singingMulti-parameter correlation analysis. By observing the "growth rate" and "change in the proportion of components" of the gas content (e.g. IEC triple-ratio method), the operation and maintenance personnel can more accurately determine the type of fault (overheating/discharge/moisture), the location of the fault (winding/core/tap changer) and the speed of development, avoiding misjudgments caused by the limitations of offline testing "single data". It avoids misjudgments caused by the limitations of offline "one-shot data". For example, by comparing the rate of increase of ethylene concentration from 5μL/L to 30μL/L within 1 month, it can be determined that the overheating fault is accelerating and requires urgent maintenance; whereas a single offline data of 20μL/L may be determined as a "cautionary value", which may cause a delay in decision-making.

Traditional offline testing requires manual on-site sampling, sending samples to the laboratory for analysis, which involves transportation, manpower, reagents and other costs, and the testing cycle is long and inefficient. Online monitoring system to achieveautomatic operationThe system eliminates the need for frequent manual intervention and only requires periodic replacement of consumables (e.g., filter cartridges, columns), which significantly reduces operation and maintenance costs and labor intensity. This is especially advantageous in remote areas or in a large number of substations.

The online monitoring system can be integrated with the substation automation system (SCADA), condition maintenance platform, etc., and upload the monitoring data in real time to the dispatching center or cloud platform, supportingRemote monitoring, automatic alarm, intelligent diagnosis(e.g. through AI algorithms to automatically identify fault types). This is not only in line with the current trend of "digital and intelligent" transformation of the power grid, but also helps operation and maintenance personnel to realize "centralized monitoring and remote diagnosis" and improve the overall efficiency of power grid operation and maintenance.

In summary, the core value of transformer oil chromatography online monitoring system is to fundamentally improve the safety, reliability and economy of transformer operation through the "real-time, early, automated" monitoring means, and it is an indispensable key technology in the high-voltage equipment condition maintenance system.