Large power transformers may be subjected to severe vibration during long-distance transportation or lifting

Table Characteristic Dimension Detailed Description Frequency Range Ultra-wide bandwidth, typically 10Hz ~ 10MHz, high-end models up to 20MHz or 30MHz to capture finer high-frequency features. Scanning Speed Ultra-fast sweep, single three-phase test usually completed within 1-3 minutes. Accuracy and Dynamic Range Amplitude resolution up to 0.02dB, dynamic range > 100dB, ensuring weak signals are not distorted. Intelligent Diagnostic Algorithm Built-in algorithms such as correlation coefficient (R), root mean square error (RMSE), weighted standard deviation, automatically calculate three-phase inconsistency, and provide automatic diagnostic conclusions of "Normal", "Mild", "Moderate", and "Severe" according to DL/T 911 standard. Anti-interference Capability For strong electromagnetic environments on site, digital filtering, synchronous sampling technology, and shielded dedicated test leads are used. No power outage required (some models support live testing, but power outage is recommended) or clear curves can still be obtained in noisy environments. Wiring Method Supports two test modes: End-to-End and End-to-Ground, adapting to different transformer structures. Data Management Built-in large-capacity database stores historical fingerprint patterns; supports USB/Wi-Fi export; software has powerful curve overlay comparison and differential analysis functions, allowing intuitive display of changes. Portable Design Main unit lightweight (<5kg), equipped with dedicated shielded test leads and magnetic probes, suitable for high-altitude and narrow space operations. 4. Typical Application Scenarios After Outlet Short Circuit: After a transformer is subjected to a near-area short circuit current impact, winding deformation testing must be performed immediately to determine if damage has occurred. After Transportation and Installation: Large power transformers may be subjected to severe vibration during long-distance transportation or lifting, and testing is required during commissioning. Preventive Testing: Combined with annual maintenance, establish winding health records to monitor deformation trends. Fault Troubleshooting: When a transformer has gas alarm or abnormal oil chromatography but electrical tests are normal, it is used to identify hidden mechanical faults. 5. Result Criteria (Reference DL/T 911-2024) The instrument software usually automatically calculates the correlation coefficient