1. Reasonable Arrangement of Test Time: When determining the test time for a transformer arrester, it is important to avoid peak hours of daily production and maintenance. Instead, schedule tests at different points and sub-areas to prevent work overload and personnel fatigue that may lead to misjudgment or missed detection. During testing, external factors such as air humidity and surface contamination can affect the results. To ensure accurate readings, tests should be conducted on sunny days with clean and dry surfaces. Moisture on the outer porcelain sleeve can cause leakage current, which may distort the test outcome and result in incorrect conclusions. 2. Selecting the Right Current Limiting Resistor: In the power frequency discharge test circuit of a common valve-type arrester (FS-10), choosing the appropriate current limiting resistor is crucial. The resistor should limit the discharge current to prevent the arrester from burning out due to an inability to extinguish the arc. A typical discharge current of around 0.7 A is usually targeted. If the resistance is too low, the discharge current becomes too high, potentially damaging the arrester gap. On the other hand, if the resistance is too high, the gap may discharge but not form a stable arc, leading to inaccurate measurements. The measured discharge voltage might appear higher than the actual value, causing qualified arresters with lower discharge voltages to be incorrectly deemed acceptable. Additionally, there should be enough space between two arresters to allow the gap to reset properly. When using a mechanical meter, the voltage increase should be gradual to avoid errors caused by the meter's inertia. 3. Enhancing Periodic Testing of Zinc Oxide Arresters: With the modernization of rural power grids, zinc oxide arresters have gradually replaced traditional valve-type ones due to their superior electrical performance. However, with numerous manufacturers, product quality and processes vary significantly. Therefore, in addition to strict testing during installation and transfer, regular inspections are essential. Newly installed zinc oxide arresters should be tested after a certain period and under various weather conditions, making the initial test particularly critical. The testing interval should not be too long to prevent defective arresters from remaining in operation, which could pose risks to the grid and distribution transformers. 4. Paying Attention to Moisture Resistance of Zinc Oxide Arresters: Many 10 kV distribution zinc oxide arresters use simple sealing methods, making them more susceptible to moisture. Studies show that arresters with poor manufacturing quality are more likely to suffer from moisture ingress. During DC testing, especially for gapless zinc oxide arresters, the critical operating voltage of 1 mA DC and 75% of that voltage are key parameters. These tests are vital for ensuring the arrester functions effectively under real-world conditions. 5. Strengthening Statistical Analysis of Arrester Performance: It is essential to classify and analyze the types of defects found in arresters and track them by manufacturer. Arresters from the same manufacturer and batch with high failure rates should be closely monitored and subjected to more frequent testing. This helps ensure the safe and reliable operation of the power grid and distribution transformers.
High-power electronic power devices are repotted into an integrated module according to a certain combination of functions.
A power semiconductor module is a combination of certain functions and modes, and a power semiconductor module is a high-power electronic power device that is re-potted into a whole according to a certain function combination. Power semiconductor modules can achieve different functions according to the different components in the package. Power semiconductor modules can be used as air-cooled modules with air-cooled heat dissipation, and water-cooled modules with water-cooled heat dissipation.
It is characterized by simple installation, convenient use and maintenance, small size and light weight.
Typical applications in AC/DC motor control, various rectifier power supplies, industrial heating control, dimming, non-contact switches, electric welding machines, motor soft start, reactive power compensation, frequency converters, UPS power supplies, battery charging and discharging, etc.
Semiconductor Module Devices,Power Semiconductor Device,Semiconductor Cooling Devices,Diode Module
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