High-voltage cable partial-discharge quantity-of-state networking measurement time precise synchronizing method

Abstract

The invention provides a high-voltage cable partial-discharge quantity-of-state networking measurement time precise synchronizing method, which is characterized by comprising the following steps of step 1: replacing a principal computer network communication module in a monitoring host computer with a host network time-calibrating communication module supporting time stamp; and step 2: replacing inferior computer network communication modules in all preceding-stage units with a slave computer network time-calibrating communication module supporting the time stamp, and additionally installing a transistor-transistor logic (TTL) level hardware triggering module simultaneously. Due to the adoption of the high-voltage cable partial-discharge quantity-of-state networking measurement time precise synchronizing method, the prominent problem that the preceding-stage units and the monitoring host computer network in the high-voltage cable partial-discharge distributive-type online monitoring system both at home and abroad are lack of a time precise synchronizing performance can be solved, the synchronous monitoring of a discharge signal transmitted along the line can be realized, and a monitoring device manufacturer can be promoted to optimize and enhance relevant product performances.

Description

technical field [0001] The invention belongs to the technical field of high-voltage testing and insulation testing, and relates to a network-based measurement time synchronization method for partial discharge state quantities of high-voltage cables, which is suitable for extruding insulated power cable lines with voltage levels above 110kV (AC). Background technique [0002] With the rapid development and upgrading of my country's urban power grids, cross-linked polyethylene (XLPE, hereinafter referred to as XLPE) cables, as mainstream products in power cable engineering, have been widely used in AC transmission and distribution lines. In the past ten years, the length of cross-linked cable laying loops has grown steadily at an average annual growth rate of more than 15%. High-voltage and ultra-high-voltage cross-linked cable lines have become an important part of my country's AC power grid. [0003] Relevant studies have shown that partial discharge (Partial Discharge, her...

AI Technical Summary

Problems solved by technology

At present, there is a common technical deficiency in all kinds of networked measurement systems used in the on-line monitoring of high-voltage cables, which is the lack of precise synchronization of network time, that is, the synchronous actions of the front-end units in the network under the control of the monitoring host (such as receiving trigger software commands) , to collect information) the time accuracy is not enough, generally only accurate to the mS level

For the partial discharge signal generated by a certain discharge source on the line, its transmission time along the line is often uS level, and each front-end unit cannot complete synchronous capture of the same discharge signal, because the collection actions of each front-end unit have been separated by a certain amount. mS, it is difficult to realize the comparison of the shape change of the discharge signal along the line, the statistics of the transmission attenuation law and the phase correlation analysis, and it cannot support the accurate analysis and processing of the time domain signal and related high-end applications

[0005] In view of this, the present invention proposes a network-based measurement time precise synchronization method for high-voltage cable partial discharge state quantities to fill in the lack of time precise synchronization performance between the front-end unit and the monitoring host network in the current domestic and foreign high-voltage cable partial discharge distributed on-line monitoring system It can realize the synchronous monitoring of discharge signal transmission along the line, and at the same time promote the optimization and improvement of related product performance by monitoring equipment manufacturers

Images