The circular ring method (platinum ring method) is one of the most classic methods for measuring surface tension and interfacial tension, with a history dating back over a hundred years. It is still a testing method specified in the national standard GB/T 6541. Only by understanding its physical pri
After studying electrical engineering for so many years, what truly gave me a visual perception of the internal state of transformers was the first time I received a DGA chromatographic report. The values of seven gases correspond to completely different types of internal faults. With this set of lo
After the calibration is completed, the formal measurement of coal samples can begin. The operation process and calibration are similar, but there are several precautions specific to the characteristics of coal that require additional attention.Step 1: Sample PreparationCoal samples must be prepared
The most troublesome part of conducting dielectric loss testing in a substation is not the operation, but the interference - the 50Hz power frequency electromagnetic field generated by surrounding equipment penetrates into the measurement circuit, completely submerging the measurement signal that wa
There is a set of "series parallel pressure plates" on the HZ-109S panel, and many engineers who are using this instrument for the first time do not understand the function of this switch - if they choose the wrong one, either the current cannot be output or the required range cannot be re
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