Technology Class

With the continuous development of society, the capacity of power equipment is getting larger and larger, so the performance requirements for its insulation part are higher. Some traditional conventional megohmmeters can no longer complete high-requirement insulation tests. Nowadays, the insulation resistance tester is more commonly used. So what should we pay attention to when using this instrument? Let me explain it to you below.

With the complexity and intelligence of power systems, the accuracy and reliability of relay protection devices have become particularly critical. As the core tool for detecting the performance of these devices, the functionality and accuracy of microcomputer relay protection testers are crucial to the safe operation of power systems. The following is an in-depth analysis of the fault content that microcomputer relay protection testers can detect:

Relay protection testers play a vital role in the maintenance and protection of power systems. They are used to detect and verify the accuracy and reliability of relay protection devices, ensuring timely and effective protection when power system failures occur. The following is a detailed analysis of the differences between single-phase, three-phase and six-phase relay protection testers to help professionals choose the right test equipment based on specific application needs.

Due to different test methods, the internal resistance of the battery is divided into DC internal resistance and AC internal resistance. DC internal resistance is the battery internal resistance measured by the instantaneous DC discharge method, and AC internal resistance is the battery internal resistance measured by the AC injection or discharge method.

The DC high-voltage generator uses medium-frequency rectification and filtering technology to solve the shortcomings of large ripple coefficient and unstable waveform of the power frequency DC high-voltage generator. It is widely used in DC withstand voltage test and leakage current test of electrical equipment, and is specially equipped with the function of testing the voltage U1mA under 1mA and the leakage current under 0.75U1mA of the zinc oxide lightning arrester.

The dielectric loss factor tgδ, as a key indicator for measuring insulation performance, accurately reflects the loss characteristics of insulating materials under the action of electric fields. It can sensitively reveal the overall moisture and deterioration of the insulation of electrical equipment, as well as whether there are local defects in small-volume equipment, whether they are penetrating or non-penetrating problems.

The main function of the current transformer, as an indispensable measuring tool in the power system, is to convert the primary side of a high current into the secondary side of a low current through the magnetic effect in order to facilitate measurement and use. The core structure of the device consists of a closed core and windings. Its primary side winding has a low number of turns and is directly connected in series with the circuit of the current to be measured. In practice, the secondary side is usually configured with double or multiple windings to meet different measurement requirements.

Transformer oil chromatograph is an important analytical tool that uses chromatography to quantitatively and qualitatively analyze the gas components dissolved in transformer oil. For power generation and supply companies, this instrument is a key means to monitor whether oil-filled power equipment has potential overheating, discharge and other faults, ensuring the safe and stable operation of the power grid.

In testing cable faults it is necessary to determine the underground cable path, otherwise we cannot locate the point directly above the cable and within the distance of the rough fault. When relocating and remodeling cables, we need to know the underground path of the cable, otherwise we can't work.

In the power supply system, nonlinear issues arise from various elements. For instance, harmonics are generated during the normal operation of generators. Transformers within the grid also contribute to harmonic production. Additionally, DC transmission introduces harmonics, and high-voltage transmission lines can amplify these harmonics. The installation of parallel capacitors in substations is another factor that can lead to the emergence of harmonics. Among these, DC transmission is currently a major source of harmonics in power systems.