Technical Guide
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How to set the overvoltage protection for a DC high-voltage generator?
When conducting withstand voltage tests with a DC high-voltage generator, how should overvoltage protection be set? Should the safety threshold be based on the test voltage or directly set to the equipment’s maximum rated voltage? If the protection value is set too high, it may fail to prov...Read more -
Transformer Oil Dielectric Loss Tester Application and Selection
Dielectric loss factor (tanδ) is one of the most sensitive electrical indicators for evaluating the deterioration state of insulating oil. This article starts from the measurement principle and systematically reviews the core selection indicators, typical application scenarios, and current test s...Read more -
The different applications of transformer calibrator and transformer tester
I. Overview of Transformer Usage Technology In the power system, transformers play a core role in converting current and voltage, and their operational performance directly determines the accuracy of electric energy measurement, as well as the stability and reliability of the relay protection sys...Read more -
What are the risks of not detecting insulator defects in a timely manner?
Does a surface without obvious cracks mean that the insulator is definitely safe? If there are cracks, air holes, delamination and other defects inside the insulator but they are not detected in time, will they affect the normal operation of the entire power equipment? During the operation of sub...Read more -
Application and Selection of Current Transformer Volt-Ampere Characteristic Tester
The transformer Volt-Ampere characteristic tester is a core field testing device used in power systems to evaluate the performance of current transformers (CTs) and voltage transformers (PTs). By applying adjustable voltage to the secondary side of the transformer and simultaneously acquiring vol...Read more -
Why are SF6 gases widely used in power equipment?
When many people come into contact with equipment such as GIS and SF6 circuit breakers, they often have a question: What is SF6 gas? Why are power equipment not directly using air but instead specially filling SF6 gas? In fact, the reason why SF6 gas can be widely used in high-voltage and ultra-h...Read more -
Application Scope and Selection Method of Variable Frequency Transformer Tester
The variable-frequency current transformer tester is an automated power testing device capable of performing comprehensive characteristic tests on current transformers (CTs) and voltage transformers (PTs) either in the field or in laboratories. Utilizing variable-frequency (low-frequency) testing...Read more -
Precautions for Insulation Resistance Tester when Measuring Live Equipment
Can an insulated resistance tester be used directly to measure an energized device? Can an insulated resistance tester be used while the device is in operation? These are questions that many electricians and equipment maintenance personnel encounter in their practical work. The answer is clear: G...Read more -
Advantages and Applications of Ultrasonic Flaw Detection
Why is it often difficult to detect cracks, internal defects, or localized abnormalities in insulators promptly through visual inspection alone? In the operation and maintenance of electrical equipment, non-destructive testing (NDT) of insulators is a crucial method for assessing their internal q...Read more -
Application scenarios and core selection criteria of relay protection testers
The relay protection tester is a specialized instrument used in the power system to verify the performance of relay protection devices. With the widespread adoption of microcomputer protection, the traditional voltage regulator and phase shifter combination has been replaced by more powerful micr...Read more -
How to verify after cable fault location? The complete method from distance measurement to on-site confirmation
After the cable fault has been located, can we directly start excavation? Why is the fault distance indicated by the instrument very clear, but no obvious fault is found at the site? During the cable maintenance and emergency repair process, cable fault location does not mean that the fault point...Read more -
Different names of insulation oil breakdown voltage testers in the industry
The insulation oil breakdown voltage tester is an indispensable detection equipment in the insulation supervision of the power system. This device has more than ten different names within the industry, reflecting the interweaving of technological evolution and the standard system. This article st...Read more