Product Introduction
TPFKC-A Transformer On-load Tap Changer Tester is used to measure the parameters of various on-load tap changers of transformers. The instrument adopts computer control and through specially designed measurement circuits, it can measure the transition time, transition waveform, transition resistance, three-phase synchronization, and other parameters of on-load tap changers. Users can directly measure from the tap changer leads or directly connect to the transformer three-phase bushings and neutral point for measurement according to needs and site conditions. The instrument has functions such as analyzing, storing, and printing the measured data. It solves the problem of outdated measurement methods and lack of dedicated testing means for on-load tap changers in power transformers. It can timely diagnose potential faults of on-load tap changers during preventive tests of power equipment and transformer overhauls, which is of great significance for improving the reliability of power system operation.
Product Features
1. Strong comprehensive measurement capability. Within one instrument, it can measure various parameters of on-load tap changers, such as whether there are breakpoints during the entire process of switch selection and switching, transition waveform, transition time, transition resistance, three-phase synchronization, etc.
2. Comprehensive analysis of measurement results. Users can analyze the resistance value of each point and segment, the time of each segment, the time of each time period, and the three-phase asynchronism in the waveform through the large-screen LCD display and various function keys. Through screen analysis, users can understand the changes of various parameters of the three-phase switch at each instant during the switching process. The waveform can also be printed, stored, and historical waveforms can be reviewed for analysis and comparison.
3. Print output. The instrument is equipped with a panel-mounted front paper-loading printer, which can directly serve as an archive for the switch test report.
4. Menu-driven, flexible operation. All operation functions, prompts, and measurement results are displayed on a 240×128 dot matrix large-screen LCD. Users only need to press the function keys according to the prompts to perform measurements.
5. The instrument is equipped with anti-impact and overvoltage protection circuits. All external leads of the instrument are sent to the measurement circuit through the protection system, which can prevent damage to the instrument due to instantaneous discharge of large inductance or wiring errors.
6. Good anti-interference performance. The all-aluminum alloy chassis and the instrument are equipped with power supply noise filters and anti-interference circuits, allowing reliable measurement on-site even with poor power quality and strong electromagnetic field interference.
7. Power-off data retention. The data and waveforms measured by users can be stored separately in the instrument, and the stored content will not be lost due to power failure. It is especially suitable for bringing back to the laboratory for further analysis and archiving after completing field tests.
Technical Specifications
1. Three independent test power supplies, maximum output current: 0.5A
2. Instrument sampling rate: 10～20KHz
3. Maximum storage time for a single waveform: 6.4 seconds
4. Transition resistance measurement range: Y/0 type transformer 1～40Ω, Y type transformer 1～20Ω
5. Measurement accuracy: 1～5Ω, Δ=±10%, 5～40Ω, Δ=±5%
6. Time and synchronization error: Δ≤±1%
7. Display: 240×128T, T6963C controller
8. Printer: panel-mounted front paper-loading printer
9. Processing part:
80C320 high-speed 8-bit microprocessor, program memory 32K
Power-off data retention memory 512K bytes
High-speed A/D converter, maximum sampling rate up to 400KHz
10. Working power supply: AC 220V±10%, power ≤200W
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