The core of judging the quality of a transformer tester is whether its functions are accurate and stable, and whether it strictly complies with industry standards such as DL/T. A high-quality tester not only provides accurate data but also ensures the compliance and efficiency of testing work, which is especially crucial in preventive testing and condition-based maintenance.
Assessing Quality Based on Functional Requirements Matching
Functional Completeness and Integration
High-Quality Characteristics: Covers the core test items required by the user (such as DC resistance, turns ratio, capacity, loss, etc.) and supports one-click automatic cyclic testing.
Low-Quality Risks: Limited functionality, requiring frequent equipment replacement or manual wiring switching, prone to errors and inefficient.
Key Focus: Whether it has the ability to acquire multiple parameters simultaneously to avoid errors introduced by time-sharing measurements.
Measurement Accuracy and Stability
High-Quality Standards:
DC resistance testing accuracy within ±0.2%, resolution to 0.1μΩ.
Ratio testing basic error ≤ 0.1%, supporting automatic group identification.
Capacity testing features automatic correction for non-rated operating conditions (e.g., temperature, voltage, current compensation).
Verification Method: Check if the instrument is labeled with "Referenced Standards" and "Verification Procedures," such as JJG or DL/T series.
Automation and Intelligence Level
High-Quality Features:
Automatically determines wiring correctness, preventing reverse connection errors.
Built-in expert diagnostic system, capable of generating standardized reports (e.g., Word/PDF).
Supports Bluetooth/WiFi transmission, direct data connection to PMS or asset management systems.
Bonus Features: Includes historical data comparison, trend analysis, and anomaly warning functions.
