During on-site testing, if the curve shapes of the same transformer are inconsistent in two frequency response measurements, troubleshooting often begins by suspecting the instrument, but in practice this is mostly related to grounding methods, lead arrangement, and sweep parameter settings. When verifying a winding deformation tester, procurement personnel need to consider such on-site factors together with the equipment's own specifications in order to determine whether the equipment is suitable for actual working conditions.
The equipment supports two testing methods: frequency response method and impedance method. The sweep frequency range covers 1 kHz to 1 MHz, and the frequency resolution is configurable, making it convenient to observe winding inductance changes in the low-frequency band and capture capacitive response differences in the high-frequency band. The consistency of measurement channels needs to be verified before procurement; under the same signal source, the amplitude deviation of each channel should be controlled within a reasonable range to avoid curve misjudgment caused by channel differences.
Test results are presented in the form of amplitude-frequency curves, supporting lateral comparison among multiple transformers of the same model for relative judgment of winding condition. The equipment has built-in storage space that can save test curves and on-site information, and supports export to a computer for archiving management. During procurement, the compatibility of the export format with the existing data platform should be confirmed to reduce later organization workload.
The equipment's operating temperature range is -10°C to +40°C, and the storage temperature range is -20°C to +70°C. Its relative humidity adaptability suits the humid environments commonly found at substation sites. The power supply method needs to match on-site conditions. Before procurement, it should be confirmed whether AC/DC dual use is supported and whether battery endurance can meet the testing duration of a single maintenance session.
Frequency response testing is relatively sensitive to the wiring method for signal injection and response acquisition, so the equipment should have clear wiring guidance and shielding measures. When strong electromagnetic interference exists on site, curve repeatability can be improved by averaging multiple measurements. Procurement personnel may require suppliers to provide typical wiring schemes and verify adaptability in combination with the capacity of the test object.
Based on the test object, on-site conditions, and data management requirements, verify item by item the sweep frequency range, measurement accuracy, curve display method, and environmental adaptability indicators; when conducting lateral comparison of multiple transformers of the same model, confirm whether the equipment supports curve overlay and difference analysis functions; at the same time, confirm the supplied accessories, calibration method, and after-sales response channels to ensure maintainability after the equipment is put into use.
