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2026
Why Must a New Oil Cup Be Punctured 24 Times Before Conducting a Formal Test When Used for the First Time?

Why Must a New Oil Cup Be Punctured 24 Times Before Conducting a Formal Test When Used for the First Time?

Many beginners find this question strange - the oil cup looks clean, why can't it be used directly? The instruction manual clearly states that "new oil cups or newly cleaned oil cups should be punctured 24 times before testing", and there are sufficient technical reasons behind it, not

2026
How to Measure the Moisture Content of Transformer Insulation Oil from Sampling to Obtaining Results at Each Step?

How to Measure the Moisture Content of Transformer Insulation Oil from Sampling to Obtaining Results at Each Step?

The measurement of moisture in insulating oil may sound like a simple detection item, but in practical operation, there are many details that are easily overlooked - if not careful, the moisture in the environment can mix in, resulting in high accuracy and making incorrect judgments, which can actua

2026
Key Operating Points of DC High-Voltage Generator

Key Operating Points of DC High-Voltage Generator

I have seen many beginners using a DC high voltage generator for the first time, and the most common mistake they make is the wrong operating sequence - either close the high voltage switch without resetting the knob, or turn off the main power directly after the experiment and forget to turn off th

2026
What Are the Wiring Rules for the Ratio Tester?

What Are the Wiring Rules for the Ratio Tester?

The wiring for the variable ratio test looks simple, with only a few test clips, but it wasn't until we arrived on site that we discovered many details about which one to connect, whether to connect the neutral point, and the difference between single-phase and three-phase. Clarifying these ques

2026
How to Choose an Ultra-Low Frequency High Voltage Generator?

How to Choose an Ultra-Low Frequency High Voltage Generator?

Recently, while assisting a friend in reviewing his equipment procurement list, I discovered that the rated voltage of the ultra-low frequency high-voltage generator he selected was sufficient, but its load capacity did not match the tested cable, resulting in the inability to generate a normal wave

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