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Centralized-distributed power cable joint temperature monitoring system

A power cable and monitoring system technology, applied to thermometers, applications of thermometers, and parts of thermometers, etc., can solve the problems of long laying distance of power cables, fewer personnel, and complicated directions, and achieve more temperature measurement points, easy management, The effect of simple interface

Inactive Publication Date: 2019-12-20
DONGYING POWER SUPPLY COMPANY STATE GRID SHANDONG ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent power cables from malfunctioning during operation, the existing methods basically rely on operators to conduct regular inspections and temperature measurements. In view of the long laying distance and complicated direction of power cables, there are great limitations in the efficiency and accuracy of inspections. Moreover, due to the large number of cables and relatively few personnel, it is impossible to realize 24-hour uninterrupted inspection and temperature measurement of power cables in all jurisdictions

Method used

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  • Centralized-distributed power cable joint temperature monitoring system
  • Centralized-distributed power cable joint temperature monitoring system
  • Centralized-distributed power cable joint temperature monitoring system

Examples

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Effect test

Embodiment 1

[0052]The temperature sensor in the distributed power cable joint temperature monitoring system of this embodiment is a single-bus digital temperature sensor, more preferably a digital temperature sensor DS18B20 from DALLAS Semiconductor Company, which can directly convert the temperature into a serial digital signal and send it directly into the microcontroller for processing and control. Moreover, the physical and chemical properties of the chip are very stable, and the linearity is good when it is used as a temperature measuring element. At 0-100°C, the maximum linear deviation is less than 1°C. Single-bus data output is used, and the output value is a digital signal, so it can directly enter the single-chip microcomputer for digital processing without using an A / D converter and related interface chips. In this way, the structure of the temperature measurement system is relatively simple and the volume is not large. At the same time, it is controlled by a single-chip micr...

Embodiment 2

[0147] In the distributed power cable joint temperature monitoring system provided in this embodiment, the temperature sensor is a thermocouple sensor, and a thermocouple temperature difference circuit is used for temperature measurement. The temperature detection part can use a low-temperature thermocouple, and the thermocouple is composed of two welded together Composed of metal wires, the thermoelectric potential generated by the thermocouple is composed of the contact potential of the two metals and the temperature difference potential of a single conductor. By keeping the reference junction at a known temperature and measuring this voltage, the temperature of the sense junction can be inferred. The data acquisition part adopts a single-chip microcomputer with A / D channel, and then collects the voltage or current signal that changes with the measured temperature. The multi-channel sampling signal obtained in this way is passed through the amplifier, multi-channel analog sw...

Embodiment 3

[0149] In the distributed power cable joint temperature monitoring system provided in this embodiment, the temperature sensor adopts a two-terminal semiconductor integrated temperature sensor. Specifically, a two-terminal semiconductor integrated temperature sensor AD590, LM35, etc. can be selected, and the collected current signal is passed through The multi-channel A / D converters are sent to the single-chip microcomputer, and the single-chip microcomputer controls the data collection and conversion. Taking AD590 as an example, its temperature measurement range is -55 ~ +l50°C, and its working voltage is +4 ~ +30V. Most of the traditional multi-point temperature detection systems use analog temperature sensors (such as AD590), which generally go through the processes of front-end amplification, A / D conversion and data correction. The two-terminal semiconductor integrated temperature sensor has high anti-interference ability and is suitable for remote temperature measurement a...

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Abstract

The invention relates to the technical field of safety monitoring, in particular to a centralized-distributed power cable joint temperature monitoring system. The centralized-distributed power cable joint temperature monitoring system comprises a temperature sensor, a single chip microcomputer, an alarm, a display and a power supply unit, wherein the temperature sensor is arranged at a cable jointfor continuously monitoring a temperature change of the cable joint and forming a signal; the single chip microcomputer is electrically connected with the temperature sensor for receiving a signal output by the temperature sensor, and comparing the signal with a preset threshold to judge whether to output an alarm signal; the alarm is electrically connected with the single chip microcomputer forexecuting an alarm action after receiving the alarm signal of the single chip microcomputer; the display is electrically connected with the single chip microcomputer for displaying temperature data output by the single chip microcomputer; and the power supply unit is electrically connected with the single chip microcomputer for supplying power to the single chip microcomputer. The monitoring system can monitor the temperature change of a power cable in real time, and can promptly give an alarm when the temperature exceeds the limit or the temperature rise speed exceeds the limit to ensure theoperation safety.

Description

technical field [0001] The invention relates to the technical field of safety monitoring, in particular to a temperature monitoring system for a distributed power cable joint. Background technique [0002] Cables can be seen everywhere in daily production and life. In power plants, factories and laboratories, a large number of cables are usually laid in cable trenches to facilitate wiring, maintenance and appearance. Along with the growth of people's dependence on electricity, there are more and more cables in the cable trench, and the cable trench is getting longer and longer. The probability of fire accidents also increases accordingly. Once a cable fire occurs, a large area of ​​cable will be burned, and production cannot be resumed in a short time, resulting in heavy economic losses. Therefore, the safety protection of cables has become a problem that cannot be ignored. [0003] Practical experience and theoretical analysis have shown that all kinds of faults at the p...

Claims

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Application Information

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IPC IPC(8): G01K13/00G01K7/02G01K1/02G01K1/024G01K1/14
CPCG01K13/00G01K7/02G01K1/024G01K1/026G01K1/028
Inventor 胡宁张霖李建庆张秋瑞孙继宗王青韩冬张伟任虎孙德达朱吉者孙金燕徐秀丽石燕朱小倩杨小敏朱技
Owner DONGYING POWER SUPPLY COMPANY STATE GRID SHANDONG ELECTRIC POWER
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