GB/T 17626 and the IEC 61000 series of standards set clear requirements for electromagnetic compatibility. Since an online transformer oil chromatography monitoring system operates connected to the grid for long periods, key parameters matching site conditions must be checked item by item during selection. The following points are listed from the perspective of design and selection for reference.
Point 1: Pay attention to the resolution and calibration method of the analog-to-digital conversion chain. After chromatographic data is collected by sensors, the bit depth of the analog-to-digital converter directly affects the minimum resolvable signal. A 24-bit resolution combined with an automatic calibration function helps maintain data consistency in low-concentration ranges and reduces baseline drift caused by temperature or time drift. During selection, confirm the calibration cycle and calibration method with the supplier, and evaluate whether frequent manual intervention will be required during long-term operation.
Point 2: Confirm whether data storage and query capabilities meet the operation and maintenance cycle. Oil chromatography monitoring involves trend data. A historical data storage life of 10 years means it can support cross-year gas generation rate analysis. During selection, check whether the system provides multiple data display and query methods such as reports and trend charts, and whether the data export format is convenient for integration into the existing production management system, so as to avoid data silos later.
Point 3: Environmental adaptability must be verified according to the installation location. Site conditions in extremely cold, high-temperature, high-humidity, and high-altitude areas vary greatly. The equipment's performance under conditions such as temperature cycling, condensation, and low air pressure directly affects data continuity. During selection, the system's operating temperature range, protection method, and insulation and heat dissipation design at high altitude can be confirmed according to the actual environmental conditions of the substation. This series of products has application records under these environmental conditions and can serve as a reference, but it is still recommended to confirm each item according to the specific project conditions.
Point 4: Anti-interference performance should be based on standard compliance. Substations contain multiple interference sources such as switching operations, lightning strikes, and radio interference. Electromagnetic compatibility performance meeting GB/T 17626 and IEC 61000 standards is a basic indicator for measuring whether the system can operate stably in a complex electromagnetic environment. During selection, test items and judgment results related to the relevant standards may be requested, rather than relying only on general descriptions.
Point 5: Alarm functions and data access methods affect subsequent linkage. A two-level alarm function can distinguish and indicate abnormal conditions at different concentrations. If alarm signals can be transmitted remotely, it is easier to connect them to station-side or master-station monitoring. An open database design can connect to the power system local area network, enabling monitoring data to interface with dispatching and operation and maintenance platforms. During selection, it is recommended to clarify whether alarm thresholds can be set, the type of remote transmission interface, and the degree of database openness to ensure compatibility with existing systems.
The above items can have their priorities adjusted according to project scale and operation and maintenance mode. It is recommended to specify parameters and acceptance methods item by item in the technical agreement.
