Method for alarming dancing of overhead transmission circuit
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A technology for overhead transmission lines and wire galloping, applied to measuring devices, instruments, etc., can solve problems such as lack, wire fittings and tower damage
Active Publication Date: 2011-06-15
SOUTH CHINA UNIV OF TECH
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[0006] The object of the present invention is to overcome above-mentioned deficiency, provide a kind of galloping early warning method of overhead transmission line, it has solved the present early warning method and only monitors amplitude aspect and does not have transmission line dynamic load change monitoring, and lacks through integrated amplitude and dynamic load change monitoring Results Early warning of wire galloping, which may cause damage to wires, insulators, fittings and towers, etc., can effectively avoid galloping accidents, and has the advantages of good safety and high accuracy
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Embodiment 1
[0079] see figure 1 Embodiment 1 of the present invention includes a wire vibration sensor 1, a wire tension sensor 2, an insulator string tension sensor 3, a suspension insulator string and fittings 4, an overhead transmission line wire 5, and a straight tower 6. The hardware is a wire clamp.
[0080] A galloping early warning method for overhead transmission lines in this embodiment includes the following steps:
[0081] Step S1, monitoring the dynamic load change of the ice-coated conductor:
[0082] When the line equivalent ice thickness h>0, use the wire vibration sensor 1 to measure the wire galloping frequency v, galloping cycle time T=1 / v, and use the wire tension sensor 2 and the insulator string tension sensor 3 to continuously measure at least one cycle T Horizontal load F within h (t) and the vertical load F v (t) Data.
[0083] Wherein the line equivalent icing thickness h can be calculated by the existing monitoring technology, the wire vibration sensor 1 is...
Embodiment 2
[0136] The present invention can be implemented by installing tension sensors on the linear tower and the tension tower in the same file, see figure 2 , Embodiment 2 of the present invention includes a wire vibration sensor 1, a wire tension sensor 2, an insulator string tension sensor 3, an insulator string and fittings 4, an overhead transmission line 5, a straight line tower 6, and a strain tower 13.
[0137] Adopt embodiment 2 a kind of galloping early warning method of overhead transmission line, comprise the following steps:
[0138] Step S1, monitoring the dynamic load change of the ice-coated conductor:
[0139] When the line equivalent ice thickness h>0, use the wire vibration sensor 1 to measure the wire galloping frequency v, galloping cycle time T=1 / v, and use the wire tension sensor 2 and the insulator string tension sensor 3 to continuously measure at least one cycle T Horizontal load F within h (t) and the vertical load F v (t) Data.
[0140] Wherein the li...
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Abstract
The invention discloses a method for alarming the dancing of an overhead transmission circuit. The method comprises the following steps of: (S1) monitoring the dynamic load change condition of an iced lead and measuring the data of a vertical load and a horizontal load in at least one period; (S2) estimating a lead dancing amplitude A according to the change of the horizontal dynamic load; (S3) calculating a maximum dynamic load and a minimum electric gap according to the dynamic load measurement of lead dancing in the step (S1) and the lead dancing amplitude A estimated in the step (2); (S4) calculating the design load and calculating a design electric gap according to the design parameters of an overhang insulator strings, fittings, overhead transmission line leads and a linear tower; and (S5) comparing the maximum dynamic load calculated in the step (S3) with the design load calculated in the step (S4) or comparing the minimum electric gap calculated in the (S3) with the design electric gap calculated in the step (S4) for judging alarm and returning to the step (S1). The invention has the advantages of good line safety and high accuracy.
Description
technical field [0001] The invention relates to the field of online monitoring of overhead transmission lines in the field of electric power, in particular to a galloping early warning method for overhead transmission lines. Background technique [0002] Overhead transmission line galloping is a self-excited vibration with low frequency (0.1-3Hz) and large amplitude (5-300 times the diameter of the wire) generated by ice-coated wires. Its formation mainly depends on three aspects: ice coating, wind speed and wind direction , line structure and parameters. [0003] The hazards of conductor galloping can be divided into two categories: one is phase-to-phase flashover or discharge accidents relative to overhead ground wires caused by large conductor galloping amplitude; the other is the large dynamic load generated by conductor galloping on insulators, fittings, conductors And towers cause impact damage, leading to local damage and even serious grid accidents such as tower col...
Claims
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