Double-end partial discharging positioning method of long-distance cable based on correction pulses

Abstract

The invention discloses a double-end partial discharging positioning method of a long-distance cable based on correction pulses. The correction pulses are used as triggering signals of a double-end partial discharge detector, and the problem that partial discharge of the long-distance cable is attenuated greatly and positioning is hard in single-end partial discharge positioning is solved. In addition, the double-end partial discharging positioning method replaces a method in which GPS synchronous time service is used for positioning, is simpler and more practical, and can be used to simplify equipment and reduce equipment cost. According to the double-end partial discharging positioning method, two partial discharge collectors are used, namely a host collector and a slavery collector, the host collector is installed at the voltage application end of the cable, and the slavery collector is installed at the opposite end of the cable. The two partial discharge collectors use the input correction pulses as the triggering signals. According to the method, errors caused by spreading attenuation of correction signals in the cable are taken into consideration and corrected, and a good positioning effect can be achieved.

Description

technical field [0001] The invention belongs to the field of power systems and relates to the technical field of partial discharge signal acquisition and partial discharge location, in particular to a calibration pulse-based double-end partial discharge location method for long-distance cables. Background technique [0002] For the safety of urban power transmission and the beauty of the city, power cables are widely used in the city's distribution network. However, due to factors such as defects in the manufacturing process of power cables, irregular installation processes, external force damage and aging damage in the later stage, there may be potential local defects in power cables, which will cause partial discharge under operating voltage and accelerate the aging of power cable insulation materials. , eventually leading to insulation breakdown. Therefore, it is of great significance for the safe operation of power cables to find and accurately locate the partial discha...

AI Technical Summary

Problems solved by technology

GPS can ideally solve the problem of clock synchronization through synchronous time service, but in some cases there is a problem that the GPS signal is weak or the GPS signal cannot be received. In addition, this method requires additional signal receiving devices, etc., which increases the equipment cost; Based on the asynchronous double-terminal partial discharge location method, the partial discharge acquisition device at the opposite end is triggered by the partial discharge signal. This method can effectively save equipment costs and operational complexity, but due to the randomness and attenuation of the partial discharge signal, it is difficult to ensure double-terminal The acquisition system is triggered by the same partial discharge pulse, and it is likely that both ends are triggered by different partial discharge pulses, which brings great inconvenience to subsequent data processing such as waveform alignment and partial discharge positioning.

[0005] All of the above methods have disadvantages such as high test cost, difficult positioning, and poor positioning accuracy, which limit the further application of long cable partial discharge detection and positioning to a certain extent.

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