The key to choosing a transformer tester lies in matching it to specific functional requirements and application scenarios. Different types of testers are designed for specific testing items, and improper selection may lead to inaccurate data, low efficiency, or safety hazards. The following is a guideline for accurate selection based on functional requirements:
Selection by Core Testing Functions
Measuring Winding DC Resistance → Select "Transformer DC Resistance Tester"
Applicable Scenarios: Checking winding welding quality, tap changer contact status, and determining inter-turn short circuits.
Key Selection Parameters:
Test Current Rating: For large power transformers, it is recommended to choose a constant current source of 10A or higher to avoid unstable measurements due to insufficient current.
Magnetic Aid Function: Significantly shortens charging time for five-limb core or delta-connected windings.
Simultaneous Measurement of Three Phases: Improves efficiency and reduces switching errors.
Recommended Model Features: Models with automatic discharge alarm, Bluetooth data transmission, and color touchscreen are preferred.
Voltage ratio and connection group testing → Select "Transformer Ratio Group Tester"
Applicable scenarios: Transformer pre-commissioning verification, commissioning testing, and preventative maintenance.
Key selection parameters:
Measuring range: Should cover 1-2000 voltage ratios, supporting automatic switching.
Blind testing function: Can automatically identify the wiring method (e.g., Yyn0, Dyn11) when the group is unknown.
CT/PT expansion capability: If testing current transformers is required, prioritize models that support polarity detection.
Portability requirements: For field operations, lithium battery powered models (e.g., BYQ3211PK) are recommended.
