Product Introduction

       NDBYZ-Ⅲ Transformer On-Load Tap Changer Tester is a comprehensive measuring instrument used to measure and analyze the electrical performance indicators of power transformers and special transformer on-load tap changers in power systems. It employs computer control and specially designed measurement circuits to measure parameters such as transition time, transition waveform, transition resistance, and three-phase simultaneity of the on-load tap changer. Depending on needs and field conditions, users can directly measure from the tap changer leads or connect directly from the transformer's three-phase bushings and neutral point.

       NDBYZ-Ⅲ Transformer On-Load Tap Changer Tester features functions such as analysis, storage, and printing of measured data. It addresses the current backward measurement methods and lack of specialized testing tools for transformer on-load tap changers in power systems. It can promptly diagnose potential faults in on-load tap changers during preventive testing of power equipment and transformer overhauls, which is of great significance for improving the reliability of power system operation.
       NDBYZ-Ⅲ Transformer On-Load Tap Changer Tester has three channels that can simultaneously record phases A, B, and C. The instrument can automatically capture and display the process of transition resistance and time jump during the transition. Unaffected by weather, its functionality is far superior to that of an optical oscilloscope.

Product Features

☆ Strong comprehensive capability: Various parameters of the on-load tap changer can be measured within one instrument, such as switch selection, presence of breakpoints during the entire switching process, transition waveform, transition time, transition resistance, and three-phase simultaneity. With various function keys, the time and resistance values of each time segment in the waveform can be analyzed.
☆ Print output: The instrument is equipped with a front-panel, front-loading high-speed printer.
☆ Excellent anti-interference performance.
☆ Full aluminum alloy chassis with built-in power noise filters and anti-interference circuits, enabling reliable measurements in environments with poor power quality and strong electromagnetic interference.
☆ Data retention and data communication.
☆ Measured data and waveforms can be saved in the instrument. Up to 128 sets of waveforms can be stored without loss due to power failure. Field-stored test results can be transmitted to a computer via a dedicated data cable through the serial port for storage. (Special software is provided by the company.)

Technical Parameters

☆ Three independent test power sources with an output current of 0.5A;
☆ Sampling rate: 10–20 kHz;
☆ Single waveform storage time: up to 6.4 seconds.
☆ Transition resistance measurement range: 1–40 Ω for Y/0-type transformers, 1–20 Ω for Y-type transformers.
☆ Measurement accuracy: 1–5 Ω, Δ ≤ ±10%; 5–40 Ω, Δ ≤ ±5%. Time error: Δ ≤ ±1%.
☆ Display: 240×128 T, T6963C controller;
☆ Processing unit: High-speed 8-bit microprocessor, 512 KB data memory, capable of storing up to 128 sets of waveforms;
☆ High-speed A/D converter with a sampling rate of up to 400 kHz;
☆ Power supply: AC 220V ±10%, power: 200W.
☆ Dimensions: 410 mm × 320 mm × 200 mm.
☆ Weight: 5 kg