When purchasers formulate procurement requirements for on-load tap changer testers, they often focus on the transition resistance range and operation sequence, while overlooking the matching relationship between transition resistance measurement accuracy, sampling rate, and transition waveform time resolution. When the tester's sampling rate is insufficient or the range does not match the transformer under test, the transition resistance value may be distorted, and the judgment of transition time and three-phase simultaneity will be affected, causing inconvenience to later data analysis. Therefore, clarifying testing requirements should prioritize the parameters of the transformer under test and the standards to be implemented.
The DRD-9100 on-load tap changer tester is designed for transition resistance measurement of Y/0 type transformers, with a transition resistance measurement range of 1-40Ω and a measurement error meeting the ±5%R requirement. The instrument supports transition waveform recording and operation sequence analysis, and can measure parameters such as transition resistance, transition time, and three-phase simultaneity. The device has a built-in DC power supply and is suitable for routine testing and post-maintenance verification of transformer on-load tap changers, providing purchasers with clear functional boundaries and a basis for model selection.
During model selection, it is recommended to check the following parameters: whether the transition resistance range covers the nameplate value of the switch under test; whether the transition time measurement range meets the requirements for recording the entire tap switching process; whether the sampling rate is sufficient to restore the details of the transition waveform; and whether the three-phase simultaneity measurement error meets on-site judgment requirements. The DRD-9100 is configured according to conventional requirements of power maintenance sites in the above parameters, and can cover the on-load tap changer testing needs of common 35kV to 220kV voltage level transformers.
This tester is suitable for scenarios such as substation maintenance, factory tests of transformer manufacturers, and handover acceptance of power engineering. Before use, confirm that the instrument is reliably grounded, connect the test clamps according to the wiring diagram, and avoid signal distortion in strong electromagnetic interference environments. After testing is completed, export waveforms and data promptly for comparison with historical records. For switches whose transition resistance measurement range exceeds 1-40Ω, confirm whether they are within the applicable range of the instrument, and if necessary, select testing equipment with an appropriate range.
