In the power system, on load tap changer (OLTC) is the core component of transformer voltage regulation, and its reliability directly affects the voltage stability and operational safety of the power grid. The traditional maintenance method relies on manual operation and empirical judgment, which has drawbacks such as low efficiency and large errors.Jiuyi fully automatic on load tap changer testerBy integrating high-precision sampling, intelligent analysis, and portable design, full parameter automatic detection of OLTC transition waveform, resistance, and three-phase synchronization has been achieved, becoming an innovative tool in the field of power equipment maintenance.

1、 Core Performance: Accurate Measurement and Comprehensive Analysis

1. Multi parameter synchronous detection capability

The tester is equipped with three independent test power supplies (output current 0.5A), which can synchronously measure transition resistance, transition time, and three-phase synchronicity. Its sampling rate reaches 10-20kHz, and the single waveform storage time is 6.4 seconds, ensuring the capture of transient details of switch actions. For example, in the testing of Y/0 type transformers, the measurement range of transition resistance is 1-40 Ω, with an accuracy of ± 10% (1-5 Ω section) and ± 5% (5-40 Ω section), and a time measurement error of ≤± 1%, meeting the requirements of DL/T 596-2021 "Preventive Test Code for Power Equipment".

2. Intelligent waveform processing technology

Built in 80C320 high-speed microprocessor and 400kHz high-speed A/D converter, capable of real-time amplification, reduction, and feature point extraction of collected waveforms. Through the built-in 32K program memory and 512K power-off data storage, the device can save three sets of historical waveforms, support archiving, retrieval, and comparative analysis, and help maintenance personnel quickly locate faults such as contact erosion and spring fatigue.

2、 Innovative Design: Balancing Portability and Security

1. Lightweight and user-friendly operation

The device size is only 410mm × 320mm × 200mm, with a weight of ≤ 5kg. It is equipped with a 240 × 128 dot matrix LCD screen and a fully Chinese menu, with an intuitive operating interface. Equipped with MP-40-8 micro printer, it can print test results and waveform diagrams in Chinese, issue on-site inspection reports, and improve work efficiency.

2. Multiple security protection mechanisms

For outdoor work scenarios, the tester adopts a three eye grounded socket and anti-interference power supply design, which can operate stably in environments with -5 ℃~40 ℃ and relative humidity ≤ 80%. After the test clamp is fixed, the system automatically detects the wiring status to avoid equipment damage or personal injury caused by misoperation.

3、 Application scenario: Full coverage from laboratory to site

1. Transformer manufacturing and maintenance

In the factory test of transformers, the tester can quickly verify the mechanical characteristics and electrical parameters of the tap changer, ensuring that the product complies with the GB/T 10230-2019 standard. In the operation and maintenance process, by regularly detecting changes in transition resistance, potential hazards such as contact wear or insulation aging can be identified in advance, thereby extending the lifespan of the equipment.

2. Electric power testing and research institutions

Universities and research institutes utilize the high-precision sampling function of testing instruments to conduct research on the dynamic characteristics of OLTC, providing data support for the design of new switches. Its light oscilloscope mode can simulate the waveform display of traditional recorders and is compatible with existing testing methods.

The Jiuyi fully automatic on load tap changer tester redefines the standards for power equipment maintenance with its "one click" automated detection and millimeter level accuracy, providing a solid technical guarantee for the safe operation of the power grid.