CN-121977713-A - Temperature measuring device for segmented cable

Abstract

The invention provides a temperature measuring device for a segmented cable, which relates to the technical field of cable temperature measurement and comprises a temperature measuring circuit board, a cable alignment sleeve ring and a cable locking inner core, wherein the temperature measuring circuit board is fixed on the cable locking inner core through bolts to realize concentric constraint with a cable copper core. The temperature measuring circuit board heat conducting layer adopts a configuration design based on steady-state heat topological optimization, and aims at minimizing the maximum temperature of a two-dimensional plane, and the temperature sensor performs rotary array layout according to the minimum characteristic area. The system utilizes a multiple regression algorithm to process the acquired data and reconstruct the temperature distribution of the copper core in real time. The invention has stable structure, effectively solves the problems of hysteresis and blind areas of traditional temperature measurement, can accurately position internal fault points, and remarkably improves the operation safety of the high-power cable.

Inventors

• ZHAO JIAN
• XU ZHENG
• LIU PENGBO
• GONG JUE
• GUO ZEKUN

Assignees

• 大连理工大学

Dates

Publication Date

20260505

Application Date

20251230

Claims (8)

1. 1. The temperature measuring device for the segmented cable is characterized by comprising a temperature measuring circuit board, a cable alignment sleeve ring and a cable locking inner core; The temperature measuring circuit board is provided with through holes, the number of the through holes corresponds to that of the cable copper cores, the cable copper cores penetrate through the through holes, a plurality of temperature sensors are welded on the temperature measuring circuit board and used for monitoring the temperature distribution of the section of the cable in real time, the cable alignment sleeve ring is matched with the cable locking inner core, the temperature measuring circuit board is fixed in the device, and the temperature measuring circuit board is perpendicular to the cable copper cores.
2. 2. The temperature measuring device for the segmented cable according to claim 1, wherein the temperature measuring circuit board is of a multi-layer board structure, heat conducting copper-clad layers are arranged on the temperature measuring circuit board, distribution of the through holes corresponds to the number of cable copper cores, the cable copper cores penetrate through the through holes and are perpendicular to the temperature measuring circuit board, and the heat conducting layers of the temperature measuring circuit board are in a topological optimization configuration.
3. 3. The temperature measuring device for the segmented cable is characterized in that the topological optimization configuration is obtained based on a steady-state thermal topological method, and specifically comprises the steps of establishing a two-dimensional heat transfer model of a cable section, taking a copper core of the cable as a heat source, taking copper-clad material distribution of a circuit board as an optimization variable, taking the maximum temperature in a two-dimensional plane as an optimization target, and optimizing the copper-clad layer morphology obtained after the copper-clad layer high-heat-conductivity material distribution.
4. 4. The temperature measuring device for the segmented cable, which is disclosed in claim 1, is characterized in that the temperature sensor is a thermistor, and the arrangement mode of the temperature sensor on the temperature measuring circuit board is that the cable section is divided into a plurality of minimum characteristic areas according to the number of copper cores, a plurality of thermistors are arranged in each characteristic area according to the distribution condition of a temperature field, and the thermistors are rotated and arrayed by taking the circle center as a reference point, so that the characteristic areas are distributed over the whole section.
5. 5. The temperature measuring device for the segmented cable, which is characterized by comprising the following steps of carrying out numerical simulation on the through-flow temperature field of the circuit board according to the optimized copper-clad layer graph to obtain steady-state temperature field distribution, and adopting a sensor layout optimization algorithm without presetting the number of thermistors to calculate by taking a minimum insulation range as a boundary.
6. 6. The temperature measuring device for the segmented cable, as set forth in claim 1, wherein two ends of the cable alignment collar are aligned and fixed with ends of two adjacent segments of the cable respectively for positioning the cable, and the cable locking inner core fixedly locks the cable on the basis of alignment to prevent external force from changing a connecting structure.
7. 7. The temperature measuring device for the segmented cable of claim 1, wherein a bolt limiting and fixing hole is reserved on the temperature measuring circuit board, the cable alignment sleeve ring and the cable locking inner core are fixed in a pressing mode through bolt connection, and the temperature measuring circuit board is fixed through the bolt limiting and fixing hole.
8. 8. The device for measuring temperature of a segmented cable according to claim 1, wherein the circuit elements for collecting, converting and outputting temperature signals are integrated on the temperature measuring circuit board, the device is configured to fit multi-point temperature data by utilizing a multiple regression algorithm to obtain real-time temperature distribution of a copper core of the cable, and by monitoring abrupt changes of slope of a temperature rise curve, temperature abnormality is judged and an abnormal area is located.

Description

Temperature measuring device for segmented cable Technical Field The invention relates to the technical field of cable temperature measurement, in particular to a temperature measuring device for a segmented cable. Background With the development of high-power transmission technology, under the high-power operation environment, the current carried by the cable is huge, and the problem of thermal effect is increasingly outstanding. Particularly, the junction of the segmented cables is often used as a junction for electrical connection, and is often a high-occurrence area for thermal faults due to the increase of contact resistance, oxidation, connection loosening and the like. Once the temperature at the interface is too high, the aging of the insulating layer is easy to accelerate, and even insulation breakdown or fire accident can be caused in severe cases, so that huge potential safety hazard and economic loss are caused. Most of the existing cable temperature measurement means adopt traditional single-point temperature measurement or external infrared detection. The single-point temperature measurement is difficult to cover the whole cable section, a monitoring blind area is easy to appear, and the external detection has larger thermal hysteresis due to the heat insulation effect of the cable insulation layer, so that the real temperature distribution condition of the copper core in the cable can not be accurately reflected in real time. In addition, the existing temperature measuring device often lacks a reliable mechanical positioning and locking structure during installation, displacement is easy to occur when the cable is pulled or vibrated by external force, and the sensor is separated from the measured position, so that the accuracy and reliability of temperature measurement are further affected. Therefore, it is needed to develop a temperature measuring device which can be stably installed at the joint of the segmented cable, can effectively monitor the distribution of the temperature field of the section of the cable, and can timely find and locate abnormal internal temperature rise. Disclosure of Invention According to the technical problem presented above, a temperature measuring device for a segmented cable is provided. According to the invention, the topological optimization temperature measurement circuit board is fixed by the cable alignment sleeve ring and the locking inner core, the temperature of the section of the cable is monitored in real time, and an abnormal area is positioned. In order to achieve the above purpose, the invention provides a temperature measuring device for segmented cables, which comprises a temperature measuring circuit board, a cable alignment sleeve ring and a cable locking inner core; The temperature measuring circuit board is provided with through holes, the number of the through holes corresponds to that of the cable copper cores, the cable copper cores penetrate through the through holes, a plurality of temperature sensors are welded on the temperature measuring circuit board and used for monitoring the temperature distribution of the section of the cable in real time, the cable alignment sleeve ring is matched with the cable locking inner core, the temperature measuring circuit board is fixed in the device, and the temperature measuring circuit board is perpendicular to the cable copper cores. Further, the temperature measurement circuit board is of a multi-layer board structure, a heat conduction copper-clad layer is arranged on the temperature measurement circuit board, distribution of the through holes corresponds to the number of cable copper cores, the cable copper cores penetrate through the through holes and are perpendicular to the temperature measurement circuit board, and the heat conduction layer of the temperature measurement circuit board is in a topology optimization configuration. The topology optimization configuration is obtained based on a steady-state thermal topology method, and specifically comprises the steps of establishing a two-dimensional heat transfer model of a cable section, taking a cable copper core as a heat source, taking copper-clad material distribution of a circuit board as an optimization variable, taking the maximum temperature in a two-dimensional plane as an optimization target, and optimizing the copper-clad layer morphology obtained after the copper-clad layer high-heat-conductivity material distribution. The temperature sensor is arranged on the temperature measuring circuit board in a mode that the cable section is divided into a plurality of minimum characteristic areas according to the number of copper cores, a plurality of thermistors are arranged in each characteristic area according to the temperature field distribution condition, and a circle center is used as a reference point for rotating array, so that the characteristic areas are distributed over the whole section. Further, the method for determining the