Transformer on load switch tester: Instructions for use

Specification of on load switch for transformerFunctional Features

The on load switch of the transformer has functions such as displaying, analyzing, storing, and printing the measured data. Solved the problem of outdated measurement methods and lack of testing methods for on load tap changers in power transformers. Timely diagnosis of potential faults in on load tap changers during preventive testing of power equipment and transformer overhaul is of great significance for improving the reliability of power system operation. The on load switch of the transformer has functions such as displaying, analyzing, storing, and printing the measured data. Solved the problem of outdated measurement methods and lack of testing methods for on load tap changers in power transformers. Timely diagnosis of potential faults in on load tap changers during preventive testing of power equipment and transformer overhaul is of great significance for improving the reliability of power system operation.

——High precision standard measurement
This instrument is designed to fully meet the high voltage testing equipment standards of the power industry in the People's Republic of China, with general technical specifications DL/T846.8-2004. It uses a high-speed digital signal processor DSP and a 12 bit high-resolution A/D converter to achieve high-precision standard measurement.

——Optical oscilloscope function
The instrument is divided into three channels and can simultaneously record phases A, B, and C. The instrument can automatically capture and display the transition resistance and time jump process during the transition process. It can work normally in complex environments and is far superior to optical oscilloscopes in terms of accuracy and intelligence.

——Strong comprehensive ability
Comprehensive measurement of various parameters of on load tap changers can be achieved within one instrument. Whether there are breakpoints, transition waveforms, transition times, transition resistances, three-phase synchronicity, etc. during the entire process of switch selection and switching. Combined with various functional buttons, it is possible to further analyze the time and resistance values of each time period in the waveform in detail.

Transformer on load switch tester: Instructions for useTECHNICAL INDEX

1. Measurement with winding:

Sampling method:

1) Voltage sampling output current: DC 1A

2) Transition resistance measurement range: up to 0 Ω -30 Ω

3) Measurement error: ± 5%

4) Sampling frequency: 10kHz

5) Record transition waveform time: 0~120ms

6) Measurement synchronicity error: 0.1ms

2. Measurement without winding:

Sampling method:

1) Current sampling, output current: DC 9V

2) Transition resistance measurement range: large 0 Ω -50 Ω

3) Measurement error: ± 5%

4) Sampling frequency: 10kHz

5) Record transition waveform time: 0~120ms

6) Measurement synchronicity error: 0.1ms

3. Working environment:

1) Working power supply: AC 220V ± 10%

2) Frequency: 50Hz ± 1Hz

3) Operating temperature: 0 ℃~40 ℃

4) Relative humidity: ≤ 85% RH

Testing Parameters
1. Three independent test power supplies with a high output current of 0.5A;

2. The instrument is set with a sampling rate of 10~20KHZ;

3. The storage time for a single waveform is 6.4 seconds.

4. Transition resistance measurement range: 1-40 Ω for Y/0 transformer and 1-20 Ω for Y transformer.

5. Measurement accuracy: 1-5 Ω, Δ=± 10% 5-40 Ω, Δ=± 5%

6. Time and synchronicity error: Δ ≤± 1%.

7. Display: 240 × 128T, T6963C controller;

8. Printer: MP-40-8 Panel Type Front Swap Printer;

9. Processing section:

1) 80C320 high-speed 8-bit microprocessor;

2) 32K program memory;

3) Maintain 512K bytes of data storage during power failure;

4) High speed A/D converter with a high sampling rate of up to 400KHZ.

10. Power supply: 220V ± 10% power ≤ 200W.

11. Dimensions: 410mm × 320mm × 200mm.

12. Weight: ≤ 5kg