During handover acceptance, preventive testing, and post-maintenance operation characteristic checks, on-load tap-changers of power transformers require measurement of transition time, transition waveform, transition resistance, and three-phase simultaneity. The DRD-6800 On-Load Tap-Changer Tester adopts computer control and a dedicated measurement circuit. It supports direct measurement from the tap-changer leads and can also measure via the transformer's three-phase bushings and neutral point wiring, adapting to different on-site wiring conditions.
The tester can record the transition waveform during the on-load tap-changer switching process and calculate the transition time and transition resistance values accordingly. Transition time measurement covers the entire switching operation. The transition resistance measurement range meets the resistance range of common switch contact circuits. Three-phase simultaneity measurement is used to compare the timing differences of three-phase operations, providing data reference for judging the consistency of switch operations.
During on-site measurement, signals can be taken directly from the tap-changer leads, reducing wiring work on the bushing side; when inspection combined with the transformer body circuit is required, wiring can also be made directly from the three-phase bushings and neutral point. The tester is controlled by a computer to complete data acquisition and processing. Measurement results are presented in waveform and numerical form, facilitating on-site comparison and analysis by technical personnel.
Transition time measurement range: set according to the switching operation characteristics; transition resistance measurement range: covers the resistance of common on-load tap-changer contact circuits; three-phase simultaneity measurement: supports three-phase operation timing comparison; measurement channels: compatible with tap-changer lead and transformer bushing wiring methods; control mode: computer control, integrated data acquisition and waveform recording. Specific parameters are subject to the factory technical documentation.
The tester is suitable for handover acceptance, preventive testing, and post-maintenance operation characteristic checks of on-load tap-changers in power transformers. It meets the routine needs of substation maintenance teams and testing units for on-site recording and analysis of the switch transition process. Before use, confirm that the wiring method matches the switch type and implement safety measures in accordance with relevant regulations.
