Technical Guide
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What does the term “three-phase” mean in the context of a three-phase standard source?
What does the term “three-phase” mean in the three-phase standard source? Can it simply be understood as “outputting three groups of electricity simultaneously”? For those who are new to the three-phase standard source, this concept can indeed be confusing. In fact, “...Read more -
What are the transformer test items? What are the test standards based on?
I. Introduction As a crucial core component in the power system, the transformer is often referred to as the “heart” of the power grid. Its performance and insulation condition directly affect the safe and stable operation of the power grid. In case of a transformer failure, it may ca...Read more -
Standard Procedure and Field Operation Guidelines for Cable Series Resonance Testing
Standard system and applicable boundaries The standards involved in the cable series resonance test can be divided into three levels. The acceptance and commissioning level is based on GB 50150-2016 “Electrical Installation Engineering – Electrical Equipment Acceptance Test Standard&#...Read more -
Application of Turns Ratio Test in Transformer Handover and Preventive Testing
The turns ratio of a power transformer—the ratio of the number of turns between the high-voltage and low-voltage windings—directly determines whether its voltage transformation capability meets design requirements. The turns ratio test involves applying a test voltage to one side of the transform...Read more -
What types of protection can the relay protection tester measure?
What types of protection can the relay protection tester test? Can line protection, transformer protection, and generator protection all be tested? In substations, power plants, and power test sites, there are many types of relay protection devices, and the corresponding test items for different ...Read more -
How to operate the zero-position startup of the DC high-voltage generator?
Why does a DC high-voltage generator require a zero-position start-up? Where should the voltage knob be placed during operation? If the start-up is not done after returning to the zero position, will it affect the equipment or the safety of the test? These are common problems encountered when usi...Read more -
Detailed Explanation of the Working Principle, Functional Advantages and Application Scenarios of the Fully Automatic Transformer Ratio Testing
When testing the transformation ratio of transformers, why are more and more power test personnel choosing fully automatic transformer transformation ratio testers? The traditional methods require manual calculation of the transformation ratio, verification of the connection group, and are prone ...Read more -
Advantages of Handheld Loop Resistance Tester and Standard Compatibility
In the operation and maintenance testing of equipment such as high-voltage switches, circuit breakers, and busbar connections, the precise measurement of loop resistance is the core method for determining the contact state of the conductive circuit. The test current must reach 100A or more to eff...Read more -
Why is the leakage current test conducted for a DC high-voltage generator?
Why is the leakage current test conducted for a DC high-voltage generator? When conducting a DC withstand voltage test, is it sufficient to simply reach the specified voltage level? Actually, it is not. For the insulation inspection of electrical equipment, the leakage current is one of the impor...Read more -
Detailed Explanation of Common Terms for Transformer Ratio Tester: Understanding Ratio, Error and Group Testing
When using the transformer ratio tester, why do the parameters such as “ratio, ratio error, group, tap position” displayed on the instrument seem numerous, but we don’t know what they represent? In the actual transformer ratio testing process, if one doesn’t understand the...Read more -
Detailed Explanation of Rated Input and Output Parameters of the Transformer Comprehensive Tester
When choosing an integrated transformer tester, many users initially focus on the test voltage, output current, and measurement range. But how should these parameters be interpreted? What is the relationship between the rated input and output parameters of the integrated transformer tester? And w...Read more -
Standard System for On-site Testing of Power Frequency Withstand Voltage and Partial Discharge Test System
I. The Dual Logic of the Test System The insulation testing of high-voltage electrical equipment involves a pair of complementary evaluation dimensions: one is to assess the insulation’s tolerance to overvoltage, and the other is to diagnose latent defects within the insulation. The former ...Read more