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The safety of the cable line operation is related to the safe production of the enterprise and the safety of people’s lives and property. Every inspection is done in a real way. Many accidents of the power cable can be effectively avoided. Therefore, the operation and maintenance of the cable is tested The importance is self-evident.
For distribution network cables, in the past, power companies mainly used infrared temperature measurement, insulation resistance measurement, power frequency withstand voltage test and OWTS shock wave partial discharge test to evaluate the insulation status of distribution network cables, and played a role in the diagnosis of construction quality and product quality. However, through the anatomy and analysis of the faulty cable equipment, it is found that water ingress and dampness are a large part of the cause of the cable equipment failure. Experience has shown that the above-mentioned test cannot find the cable water and damp defects in a timely and effective manner.
Under the above background, in 2016, Beijing State Grid Electric Power Company used ultra-low frequency dielectric loss testing equipment as a pilot unit. Practice has proved that ultra-low frequency dielectric loss testing technology is an effective method to evaluate the insulation status of cables, especially for the damp defects of cables and intermediate joints. Very effective, it is an important supplement to the withstand voltage test and the OWTS partial discharge test.
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Later, the ultra-low frequency technology was introduced into the GB50150-2016* standard. The standard mentions that the rated voltage Uo/U 18/30kV and below rubber-plastic insulated power cables can have an effective value of 3U. The 0.1Hz voltage is applied for 15min instead of the AC withstand voltage test.
Austrian B2HV is a very high use rate of ultra-low frequency cable testing equipment in the world. It was established in 2001. After three years of polishing, B2's first ultra-low frequency cable tester HVA30 was launched in 2004. Since then, B2 has continued to produce products. Innovative. In 2012, it produced HVA28TD with a volume and weight only one-half of the industry's similar products, but the quality function has not been weakened. In 2014, it produced an ultra-low frequency test system HVA200 that can output 200KV. So far, there is no second model on the market that can achieve this. This level. B2's products have achieved great recognition in various places. Moreover, the equipment produced by B2 is dry and oil-free equipment, which is safe to transport; it also has an IP67 protection level; the use time is not limited, and there is no need to test, stop and stop, and can run without interruption; unique voltage detection protection and double discharge Device to ensure the safety of the operator’s life and more user-friendly design.
