Cable dielectric loss measuring device working at ultra-low frequency band test voltage and measuring method thereof

Abstract

The invention discloses a cable dielectric loss measuring device working at ultra-low frequency band test voltage and a measuring method thereof, and belongs to the field of ultra-low frequency dielectric loss cable aging performance evaluation systems. The cable dielectric loss measuring device working at the ultra-low frequency band test voltage comprises an industrial personal computer, a device digital circuit module, an inversion module and a low-pass filtering and high-voltage sampling module. In order to avoid accidents, preventive tests are carried out on the performance of the cable at present because the cable is influenced by the temperature, humidity, oiling corrosion, manpower damage and the like of the natural environment in the operation process, and the current domestic evaluation method is backward; however, ultra-low frequency dielectric loss tests are increasingly popularized internationally for evaluation; and due to the fact that the method has the characteristicsof index sensitivity, low test power supply capacity requirement, light equipment and the like, the problems of cable damping, water tree aging and the like can be sensitively reflected through indexes such as a dielectric loss absolute measurement value, a dielectric loss change rate and the dielectric loss transient stability.

Description

technical field [0001] The invention discloses a cable dielectric loss measuring device and a measuring method working at ultra-low frequency band test voltage, and belongs to the field of ultra-low frequency dielectric loss cable aging performance evaluation system. Background technique [0002] During the operation, the cable will be affected by the electric field, temperature, moisture and other factors to cause aging, such as water branch aging, electric branch aging, thermoelectric aging and so on. Especially in the southern coastal areas, the climate is rainy and humid, resulting in high air humidity in the cable trench or tunnel. It may induce the formation of power tree, and eventually lead to the breakdown of cable insulation. Cable aging may cause accidents and bring hidden dangers to the safe operation of the power grid. [0003] In order to eliminate potential safety hazards, it is necessary to establish a set of maintenance strategies that can effectively evalu...

AI Technical Summary

Problems solved by technology

When testing equipment with uF-level capacitance, the required output power will exceed the limit of the test equipment

For the commonly used XLPE 10KV cables, the 10km capacitance is generally at the uF level, and the power frequency dielectric loss tester is not competent

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