System and method for locating oscillatory wave partial discharge of double-ended cable based on pulse injection

Abstract

The invention discloses a double-end cable oscillatory wave partial discharge locating system and method based on pulse injection. The double-end cable oscillatory wave partial discharge locating system comprises a master device, slave devices, analysis sub stations, an oscillatory wave voltage generation module and a pulse generation module, wherein the oscillatory wave voltage generation module and the pulse generation module are connected with one end of a power cable; the master device at least comprises a master device partial discharge collection module; the slave devices at least comprise slave device partial discharge collection modules; the analysis sub stations intercept partial discharge signals collected at the two ends of the power cable through the length of the power cable and the premeasured partial discharge propagation speed, acquire double-end signals at a same time base and the time difference through analysis of the double-end partial discharge signals, and conduct locating on partial discharge positions, wherein the time difference refers to the difference between the time that the partial discharge signals reach the master device and the time that the partial discharge signals reach the slave devices, and the partial discharge signals are generated by a same partial discharge source. By the adoption of the double-end cable oscillatory wave partial discharge locating system and method, the partial discharge points of long cables and short cables can be conveniently and accurately located at low cost.

Description

technical field [0001] The invention relates to a discharge detection technology, in particular to a pulse injection-based double-ended cable oscillatory wave partial discharge localization system and method. Background technique [0002] As an important power supply medium, the safety and reliability of power cables are directly related to the stable operation of the power grid. The partial discharge signal of the cable is closely related to its insulation state, so it has become the best method for evaluating the cable insulation state recommended by authoritative organizations at home and abroad. [0003] Oscillatory wave partial discharge detection is currently the most widely used partial discharge measurement and location method. In this method, the built-in high-voltage reactor and the power cable under test are used to form an LC oscillation circuit to generate a damped oscillation voltage, which excites the defective part of the power cable to generate partial disc...

AI Technical Summary

Problems solved by technology

But these methods all need to pay an expensive price, and the GPS synchronization method reception will vary in strength depending on the location, and the atomic clock needs to be calibrated regularly

Therefore, the method of using GPS and atomic clock in the double-terminal partial discharge measurement and positioning method is too costly and cumbersome to maintain

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