A temperature threshold actuator and temperature monitoring system

A technology for implementing devices and temperature thresholds, applied in thermometers, measuring devices, and thermometers with physical/chemical changes, etc., can solve the problems of many parts and complex structures, and achieve simple device structure, large bending degree, and strong reliability Effect

Active Publication Date: 2019-06-04
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the optical fiber temperature alarm threshold actuator in the prior art uses many parts and complex structure

Method used

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  • A temperature threshold actuator and temperature monitoring system
  • A temperature threshold actuator and temperature monitoring system
  • A temperature threshold actuator and temperature monitoring system

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Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a temperature threshold implementing device, which is used to increase the macrobending loss when the temperature changes, so that the loss of the optical fiber reaches a predetermined threshold and is detected. Among them, the OTDR technology combined with Rayleigh backscattering and the temperature threshold actuator of the memory alloy is an important quasi-distributed optical fiber temperature alarm system, which lays the single-mode optical fiber along the cable to be monitored. The temperature threshold actuator is placed at the cable joint). When the temperature of the monitoring point reaches the threshold temperature, the actuator will act, causing the fiber loss at this point to increase suddenly. Combined with OTDR technology, the location of the cable fault point can be quickly judged, so the system is accurate and Reliability, mainly depends on the actuator.

[0042] Based on this, a temperature threshold implementation device is pr...

Embodiment 2

[0054] A temperature monitoring system is provided in this embodiment, such as image 3 shown, including:

[0055] One or more of the temperature threshold actuators 10 described in Embodiment 1 are installed on the optical fiber to monitor the temperature of the optical fiber at the installation position. When the temperature rises, the linkage lever 6 of the temperature threshold actuator operates to turn the optical fiber Pulling into the second chamber 4, the optical fiber produces a large bend. The optical fiber is laid in parallel along the power cable to be monitored, the optical fiber passes through the temperature threshold actuator deployed at the monitoring point, and one end of the 10 optical fiber is connected to the OTDR and the communication module 11 .

[0056] An Optical Time Domain Reflectometer (OTDR for short), connected to the optical fiber. Receive the signal in the optical fiber and generate the loss signal according to OTDR technology.

[0057] The c...

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Abstract

The temperature threshold actuator provided by the present invention includes a first chamber and a second chamber, the first chamber is used for the actuator to pass through, the second chamber is provided with a shape memory alloy spring, one end of the spring is fixed, and the spring is movable. The end and the executed part are linked and connected through a linkage rod. In this solution, when the temperature of the monitored environment rises, the temperature of the actuator will rise rapidly. Once the temperature of the shape memory alloy spring reaches the transition temperature, it will extend rapidly. At this time, the movable end of the spring drives the executed part to move through linkage. Extending into the second cavity causes the actuated part to have a larger bend, so that the loss caused by the bend exceeds a threshold value, and realizes the timely perception of the temperature change of the monitored environment. The device has a simple structure and high reliability, and can work stably in harsh environments such as humidity and dust.

Description

technical field [0001] The invention relates to the technical field of optical fiber temperature detection, in particular to a temperature threshold execution device and a temperature monitoring system. Background technique [0002] Power cables are generally accompanied by a rise in local temperature before and during a fault. Temperature is an important parameter to reflect the operation of the cable. Therefore, monitoring the temperature of the power cable is important for monitoring the operation of the power cable and ensuring the safe operation of the power cable. means. [0003] At present, the commonly used cable temperature monitoring methods include: temperature-sensing cable temperature measurement system, thermistor temperature measurement system, distributed optical fiber temperature measurement system, etc. The distributed optical fiber temperature measurement system mainly realizes the temperature monitoring of the cable through the Raman scattering temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/322G01K11/324
CPCG01K11/32
Inventor 孟建黄彦周建波彭碧君程辉王金宇吕庆真姜正豪王红
Owner STATE GRID SHANDONG ELECTRIC POWER
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