Vibration monitoring system and vibration monitoring method for divided conductors

Abstract

The invention discloses a vibration monitoring system and a vibration monitoring method for divided conductors. The vibration monitoring system comprises a divided conductor vibration monitoring device (25), optical fiber (26), an optical fiber composite overhead ground wire (29), a fiber bragg grating demodulator (30) and a computer system (31). According to the vibration monitoring system and the vibration monitoring method, vibrations of the divided conductors of a power transmission line in three directions, especially the integral torsional vibration and the sub-conductor torsional vibration of a divided conductor beam are monitored, and the multipoint real-time monitoring can be carried out on the torsional rigidity of the power transmission line; and various types of divided conductors can be monitored through simple transformation, and the influence on the inherent property of the line is less. The defects that a field power supply is needed, the anti-electromagnetic interference capability is poor and the like as the torsional vibration of the conductors cannot be monitored, especially a system which can be used for implementing vibration monitoring of the divided conductors is absent and the self property of the line is easily influenced by installation of the traditional sensing system in the prior art are overcome, and convenience is provided for operation and maintenance of the line.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of high-voltage overhead transmission lines, in particular to a vibration monitoring system and method for split conductors. Background technique [0002] Under the action of wind load and ice (snow) load, overhead transmission lines exposed to natural conditions are mainly subjected to five forms of vibration: galloping, breeze vibration, sub-gap oscillation (also known as wake galloping), buffeting , and off-ice (snow) jumps. These vibration types are manifested as vibrations in the transverse (horizontal or vertical) direction of the wire. Among them, galloping is vibration with three degrees of freedom: horizontal direction, vertical direction and torsional vibration along the wire axis. The de-icing jump, in addition to the large vibration in the vertical direction of the conductor, will also be accompanied by the slight vibration in the horizontal direction; , causing overall t...

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Problems solved by technology

[0003] (1) The galloping and de-icing jump of the wires are three-degree-of-freedom vibrations, but the current monitoring technologies have not been able to monitor the torsional vibration of the wire bundle as a whole or a single sub-conductor; this limits the existing galloping and de-icing Full verification of the jumping three-degree-of-freedom theoretical model, as well as timely and accurate early warning of corresponding disasters

[0004] (2) The torsional stiffness of the split wire bundle is an essential parameter in the study of various dynamic characteristics of the split wires, but because of the linking method with the gear end, the configuration of the split wires, the arrangement of the sub-wire spacers in the gear, and the measurement point distance The change of the gear end distance and icing conditions and other factors presents a strong nonlinearity, which limits the applicability of the current theoretical analysis models for the torsional stiffness of the split wire bundle.

However, there is no technology and solution for real-time monitoring of the torsional stiffness of the line.

[0005] (3) Existing monitoring systems are mainly designed for single conductors, and there are few dynamic characteristic monitoring systems suitable for split conductors

Because the number of sub-wires of the split wires varies (commonly there are two, three, four, six or eight, etc.), it is difficult for conventional sensors to monitor the overall movement of the wire bundle, and the arrangement of the sensor on the wire bundle or the sub-wires is also lacking. Research

The existing monitoring schemes for single conductors can be roughly divided into two categories: one is to arrange the sensor between the insulator and the tower, or between the conductor and the insulator, or fix it at the conductor end close to the tower. effective monitoring of the static load, but it is difficult to evaluate the real amplitude and waveform of the wire vibration, which cannot be effectively used for dynamic monitoring of galloping and deicing jumps; another solution is to arrange multiple acceleration and displacement sensors on each wire for monitoring Galloping parameters and galloping trajectory fitting scheme, and can only be applied to single-wire monitoring, and because it is equivalent to adding multiple concentrated masses to this file of wires, it will significantly change the inherent properties of this file of wires and affect the monitoring results

[0006] (4) In the existing galloping monitoring scheme, video monitoring can only realize the qualitative monitoring of galloping, and it is difficult to carry out quantitative analysis; in addition, the existing technology mostly uses electric quantity sensors, which are easily interfered by the strong electromagnetic environment of the transmission line, and the sensors and their The stable on-site power supply required for signal transmission is not easy to obtain (such as using solar panels for power supply, and it cannot work normally in continuous rainy days)

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