According to DL/T 911—2016 "Frequency Response Analysis Method for Power Transformer Winding Deformation" and the GB 1094 series of standards, transformer winding deformation testing is typically required for equipment with voltage levels of 6kV and above. The core concerns for procurement personnel are: whether the equipment can be used stably over the long term, whether test results are traceable, and whether routine maintenance is simple. The following explains the design arrangements and usage requirements of this equipment from the perspective of maintenance and precautions.
Winding deformation testing has high requirements for the stability of signal injection and response acquisition. The equipment has a built-in environmental parameter recording function, which automatically saves parameters such as ambient temperature and humidity during testing, providing a traceable basis for subsequent diagnosis. Before use, confirm that grounding is reliable and avoid conducting tests near strong electromagnetic interference sources; test leads should avoid running parallel to high-voltage busbars to reduce coupling interference.
The amplitude measurement range of this unit covers (-100dB) to +20dB, which can meet the frequency response testing needs of 6kV and above power transformers and special-purpose equipment such as reactors. The frequency sweep range and number of points can be set according to on-site needs. It is recommended that during procurement, the required sweep frequency interval be confirmed based on the capacity and wiring mode of the transformer to be tested. The equipment supports automatic data storage, making it convenient to build a historical spectrum database for the same transformer.
It is recommended to pay attention to: whether the equipment has a self-test function, whether the test clamps and connecting cables are easy to replace, and whether stored data can be exported in a common format. Daily storage should be kept dry and protected from severe vibration; when not in use for a long time, power it on periodically for inspection. If it is to be used for testing after on-site transportation, first confirm that the instrument is in normal condition before connecting it to the equipment under test.
