CN-121977718-A - Distributed intelligent optical fiber temperature sensing system of cable bridge

CN121977718ACN 121977718 ACN121977718 ACN 121977718ACN-121977718-A

Abstract

A distributed intelligent optical fiber temperature sensing system of a cable bridge comprises a bridge top, a bridge bottom, a bridge left side wall and a bridge right side wall, wherein a regular matrix type stacked cable fixed through a clamp is arranged in the bridge, single optical fibers are arranged in the bridge, the single optical fibers are planned according to a continuous path, each cable in the stacked cable is subjected to full-coverage temperature measurement in a mode of traversing the stacked cable layer by layer to interlayer longitudinal transition in a transverse and row-by-row mode, the continuous path planning comprises repeated arrangement of a plurality of basic winding units, and each basic winding unit comprises a plurality of cable detection sections, interlayer spanning sections and calibration sections. According to the scheme, the cable level and the column number of the abnormal point can be determined by quickly reversely checking the optical fiber length corresponding to the abnormal temperature, the purposes that one optical fiber covers the full matrix and one hot spot is accurately positioned to a single cable are achieved, and the problem of space positioning of stacked cable temperature measurement is solved.

Inventors

YANG JINHONG
HAN XINGJUN
LI TONGTONG

Assignees

山东鸿丰电力科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. A distributed intelligent optical fiber temperature sensing system of a cable bridge is characterized in that a single optical fiber is arranged in the bridge according to a continuous path planning, each cable in the stacked cable is subjected to full-coverage temperature measurement in a mode of traversing the stacked cable layer by layer to longitudinally transition from layer to layer, the continuous path planning comprises repeated arrangement of a plurality of basic winding units, and each basic winding unit comprises a plurality of cable detection sections, a layer crossing section and a calibration section.
2. The distributed intelligent optical fiber temperature sensing system of a cable bridge according to claim 1, wherein the optical fibers of the cable detection section are tightly attached to all columns of cables of the layer at fixed intervals to complete winding, and the optical fibers are fully contacted with the surface of each cable.
3. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to claim 1, wherein the interlayer spanning section is a connection transition of two adjacent layers of cable detection sections, the interlayer spanning section spans vertically upwards or downwards along the edge of a cable clamp or a reserved gap of the bridge frame, and the optical fiber of the interlayer spanning section is not contacted with any cable and always keeps a fixed bending radius.
4. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to claim 1, wherein the calibration sections are arranged on the inner wall of the bridge frame or the fixed support in each basic winding unit, the optical fibers of the calibration sections and the inner wall of the bridge frame or the fixed support are rigidly fixed through special rigid buckles, physical coordinates are measured and recorded in advance at fixed positions, and meanwhile, the mileage number and the physical coordinates of the optical fibers corresponding to each calibration section are recorded into a positioning database.
5. The distributed intelligent fiber optic temperature sensing system of a cable tray according to any one of claims 1-4, wherein the primary winding units of the odd column stacked cables and the even column stacked cables are different.
6. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to any one of claims 1 to 4, wherein N layers of cables of the odd-numbered columns of stacked cables are correspondingly provided with 2N-1 cable detection sections, each cable detection section is specially adapted to one layer of cable, interlayer crossing sections of the odd-numbered columns of stacked cables are vertically connected layer by layer from the uppermost layer of the stacked cables, optical fibers are wound in an S shape when crossing from the upper layer to the lower layer, are vertically connected layer by layer after being connected to the lowermost layer of the stacked cables, are wound in an opposite S shape after being connected to the uppermost layer, are connected to calibration sections, and the calibration sections of the odd-numbered columns of stacked cables are arranged on the bridge frame top at the tail end of each basic winding unit.
7. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to claim 6, wherein the length of the cable detection section of the lowest layer of the odd-numbered stacked cables along the extending direction of the cables is twice as long as that of the cable detection sections of the other layers, the lengths of the cable detection sections of the other layers are the same, the length of the calibration section is half of that of the cable detection section of the lowest layer, the cable detection sections of each layer of the odd-numbered stacked cables are wound from one cable at the leftmost side or the rightmost side of the layer, all the cables of the layer are wound in a column-by-column mode through S-shaped rectangular waves, and the contact distance between the optical fibers of the cable detection sections of the same layer and each cable is the same.
8. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to claim 5, wherein N cable detection sections are correspondingly arranged on N layers of cables of the even-numbered row of stacked cables, each cable detection section is specially adapted to one layer of cable, the even-numbered row of stacked cables are in one basic winding unit, after crossing from the uppermost layer to the lowermost layer by layer, the next basic winding unit is directly started from the lowermost layer to the uppermost layer through the calibration section, and the lengths of the cable detection sections of the even-numbered row of stacked cables are the same.
9. The distributed intelligent optical fiber temperature sensing system of the cable bridge frame according to claim 8, wherein the calibration sections of the even-numbered stacked cables are arranged on the left and right side walls of the bridge frame at the tail end of each basic winding unit, the temperature measuring optical fibers of the even-numbered stacked cables are wound in an S shape when crossing from top to bottom layers and return to the topmost layer directly through the vertical upward calibration sections, the cable detection sections of the even-numbered stacked cables are arranged on the left or right side of each layer, the optical fibers start to extend for half basic extension length and then enter the next adjacent cable, the extending direction of the optical fibers in the next adjacent cable is the same as the extending direction of the optical fibers in the previous cable, and the optical fibers also extend for half basic extension length, then extend to the last cable in a winding manner of an S-shaped rectangular wave, and the contact length of the optical fibers and each cable is half basic extension length.
10. The distributed intelligent optical fiber temperature sensing system of cable tray of claim 9, wherein for odd columns and even columns of stacked cables of the same number of layers, the length of the lowest cable detection section of the odd columns of stacked cables is the same as the length of the cable detection section of each layer of the even columns of stacked cables.

Description

Distributed intelligent optical fiber temperature sensing system of cable bridge Technical Field The invention relates to the field of temperature sensing, in particular to an intelligent sensing system for temperature sensing detection in a cable bridge, and specifically relates to a distributed intelligent optical fiber temperature sensing system for a cable bridge. Background The excessive stack of cables in the cable bridge can cause the extrusion of heat dissipation space, and heat accumulation not only accelerates the ageing and embrittlement of insulating layers and causes safety accidents such as electric leakage and short circuit, but also can cause the reduction of the current-carrying capacity of the cables due to high temperature to influence the power transmission efficiency, and even possibly causes chain fire in key scenes such as industrial factories and high-rise buildings to cause serious property loss and casualties. Therefore, the real-time temperature detection of the stacked cables is of great importance, the hidden danger of local overheating can be captured in advance, accurate early warning is provided for operation and maintenance personnel, the expansion of accidents is avoided, the load distribution of the cable operation can be optimized, and the stable and reliable operation of the power system is ensured. The DTS distributed optical fiber temperature sensing technology can realize the whole-course non-blind-area temperature measurement of the cable in the bridge by virtue of the distributed measurement characteristic, has the advantages of electromagnetic interference resistance, severe environment resistance, high response speed and the like, can accurately position the hot spot position and the temperature gradient, provides comprehensive data support for the safe operation and maintenance of the cable, and has wide application prospects in the fields of smart grids, industrial power distribution and the like. However, the temperature measuring optical fiber is wound in the stacked cable, and the temperature measuring optical fiber is subjected to outstanding space positioning technical problems that the stacked cable is disordered in arrangement, the optical fiber winding path is difficult to accurately plan, the physical position of the hot spot cannot accurately correspond to the optical fiber measuring point, the positioning error is large, the number of cable stacking layers is uncertain and is easy to shift, so that the space coordinates of the optical fiber winding are dynamically changed, a stable positioning reference is difficult to establish, meanwhile, the shielding and extrusion of the interlayer cable can cause uneven bending radius of the optical fiber, the temperature measuring accuracy is influenced, the accuracy of a space positioning algorithm is further interfered, and the cable level and the specific position of the hot spot cannot be accurately judged. Therefore, a distributed intelligent optical fiber temperature sensing system of a cable bridge is required to be designed so as to solve the problem of optical fiber temperature measurement space positioning of stacked cables in the prior art. Disclosure of Invention The invention aims to provide a distributed intelligent optical fiber temperature sensing system of a cable bridge, which aims to solve the technical problems in the prior art. The invention adopts the following technical scheme to realize the aim: A distributed intelligent optical fiber temperature sensing system of a cable bridge comprises a bridge top, a bridge bottom, a bridge left side wall and a bridge right side wall, wherein a regular matrix type stacked cable fixed through a clamp is arranged in the bridge, single optical fibers are arranged in the bridge, the single optical fibers are planned according to a continuous path, each cable in the stacked cable is subjected to full-coverage temperature measurement in a mode of traversing the stacked cable layer by layer to interlayer longitudinal transition in a transverse and row-by-row mode, the continuous path planning comprises repeated arrangement of a plurality of basic winding units, and each basic winding unit comprises a plurality of cable detection sections, interlayer spanning sections and calibration sections. Preferably, the optical fibers of the cable detection section are tightly attached to all the column cables of the layer at fixed intervals to complete winding, and the optical fibers are fully contacted with the surface of each cable. Preferably, the inter-layer spanning section is the connection transition of two adjacent cable detection sections, the inter-layer spanning section spans vertically upwards or downwards along the reserved gaps of the edges of the cable clamps or the bridge, and the optical fibers of the inter-layer spanning section are not contacted with any cable and always keep a fixed bending radius. Preferably, the calibration sections are arranged o