Currently, there is a growing trend worldwide towards replacing traditional oil-filled paper-insulated power cables with XLPE-insulated power cables. However, the testing methods prior to the deployment of these cross-linked cables have largely remained reliant on the DC withstand voltage test, primarily due to the high capacity requirements of the testing equipment. In recent years, extensive research conducted by both international and domestic institutions has highlighted that DC tests can cause varying degrees of damage to XLPE cables, even if the cable does not fail during the test. Furthermore, the electric field distribution under DC voltage differs significantly from that under AC operating conditions. This discrepancy means that DC tests cannot accurately simulate the actual overvoltages a cable experiences during operation, nor can they effectively detect potential defects in the cable or its joints, as well as issues arising from the installation process. Consequently, the demand for non-DC testing methods for cross-linked cables has gained increasing attention. Recognizing this need, our company has developed and manufactured a cable variable-frequency series resonant AC withstand voltage test system to address these challenges.
This new technology aims to provide a more accurate and less damaging way to evaluate the performance of XLPE cables, ensuring safer and more reliable installations. Our team continues to refine this system, incorporating feedback from field applications to further enhance its effectiveness. We believe that adopting advanced testing methods like this will play a crucial role in improving the overall quality and safety standards of power cable systems globally.
2.4G/5.8 G Antenna
Twisted-pair, cable to optical fiber, waveguide and other transmission media are conductive media, and electromagnetic wave in free space in the long distance propagation is non-conductive media transmission; Attenuation is therefore a complex function of distance and is influenced by the atmosphere around the Earth. The main factors affecting propagation attenuation are: propagation frequency band F, propagation distance L and electromagnetic wave rate C(close to the speed of light). Free space propagation loss of microwave segment signals such as satellites is about 36000 km from the ground. The beam diverges with distance. High-power klystrons can transmit signals up to kilowatts, while satellite transponders can only be powered by solar energy. The satellite's limited surface area makes it difficult to transmit hundreds of watts of downlink power. As a result, the ground station's received signal power is only microwatt level and includes a compensation effect of tens of decibels of the gain of the receiving and transmitting antennas.
2.4G or 5.8G Antenna Signal Booster,2.4G Outdoor Antenna,2.4G indoor Antenna,2.4G Small Antenna
Yetnorson Antenna Co., Ltd. , https://www.yetnorson.com