GPS synchronous timing-based XLPE cable partial discharge positioning device

Abstract

A GPS synchronous timing-based XLPE cable partial discharge positioning device is provided. The GPS synchronous timing-based XLPE cable partial discharge positioning device includes a first high-frequency sensor, a second high-frequency sensor, an XLPE cable partial discharge detection positioning host, an XLPE cable partial discharge detection positioning slave and an upper computer. According to the GPS synchronous timing-based XLPE cable partial discharge positioning device of the invention, a single positioning device is divided into two sets of apparatuses which respectively detect high-frequency current signals of cable connector grounding lines at two ends of one XLPE cable, wherein one apparatus is adopted as the detection host, and the other apparatus is adopted as the detection slave; and the host and slave can realize synchronous acquisition through GPS timing synchronization, and therefore, precise time difference of the same pulse can be obtained, and a partial discharge power source can be precisely positioned.

Description

technical field [0001] The invention relates to the technical field of partial discharge positioning, in particular to a partial discharge positioning device for cross-linked polyethylene (XLPE) cables based on GPS synchronous timing. Background technique [0002] Cross-linked polyethylene (XLPE) cables are widely used in urban main power grids. Due to the impurity of raw materials in the production of XLPE cables, or due to problems in the manufacturing process, there may be air gaps, impurities or protrusions in the insulating layer, and partial discharges are easily transmitted in these parts where air gaps and protrusions exist; in addition, the operating environment of XLPE cables It is relatively harsh, and its insulating material is easy to be corroded. Under the action of partial discharge, it will aggravate the aging of the insulating material, and eventually lead to the failure of the main insulation breakdown. Therefore, detecting and locating the partial dischar...

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Problems solved by technology

Acoustic-electric joint detection method adopts two detection methods: ultrasonic detection method and high-frequency current detection method at the same time. Using the different propagation speeds of high-frequency current signals and ultrasonic signals in XLPE cables, the direction of partial discharge signals can be determined. If accurate Locating the location of partial discharge is time-consuming and complicated

The oscillatory wave detection method uses an oscillatory wave signal generator to replace the power frequency test power supply, injects an oscillatory wave voltage at one end of the XLPE cable, uses the oscillatory wave voltage to cause defects to generate partial discharges, and locates the partial discharge position. The disadvantage is that a special oscillatory wave signal is required generator, and requires equipment outage

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