Segmented Temperature Sensing Cable for Precise Fire Point Location
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Solution Overview
Problem
Existing temperature sensing cables for power cables suffer from inaccurate localization of high-temperature segments, false alarms due to electromagnetic interference and moisture, and poor moisture resistance and anti-electromagnetic interference performance.
Innovation Solution
A temperature sensing cable with a power signal multiplexing cable and multiple temperature sensing lines, each with a controller and acquisition circuits, capable of outputting early warning signals based on varying analog quantities and rates of change, integrated with filtering circuits for interference reduction and embedded in an insulating layer for moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional temperature sensing cables are used to monitor power cables, then temperature monitoring function is provided, but accurate localization of high-temperature segments cannot be achieved
Solution Approach 1:
The temperature sensing cable is divided into multiple sensing segments, each equipped with an independent control unit that can detect and locate temperature changes in its specific segment. This segmentation enables precise localization of high-temperature segments along the power cable.
Solution Approach 2:
Control units are introduced as intermediary components between the temperature sensing lines and the central processing system. These control units process local temperature data and generate location information, serving as mediators that bridge the gap between raw temperature data and actionable location information.
2Reliability
If traditional temperature sensing cables are used in power cable environments, then temperature monitoring is enabled, but false alarms occur due to electromagnetic interference and moisture
Solution Approach 1:
The patent uses the temperature-sensing material's resistance change characteristic (which can be affected by electromagnetic interference) in a controlled manner through differential measurement. By measuring the difference in resistance changes between two parallel conductors, the system converts the harmful effect of electromagnetic interference into a useful differential signal that indicates actual temperature changes rather than false alarms.
Solution Approach 2:
The control units continuously monitor temperature changes in real-time and provide feedback to the central processing system. This feedback mechanism allows the system to distinguish between normal temperature variations and actual fire conditions, reducing false alarms while maintaining reliable fire detection.
3Ease of manufacture
If simple temperature sensing structures are used, then manufacturing cost is reduced, but anti-electromagnetic interference and moisture resistance performances are poor
Solution Approach 1:
The patent employs composite material structures for the cable insulation and protective layers. Multiple layers of insulation and protective materials are combined to create a composite structure that provides both electromagnetic interference resistance and moisture protection, while maintaining manufacturing feasibility through standardized material combinations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately locates high-temperature points, reduces false alarms, and enhances anti-electromagnetic interference and moisture resistance, enabling precise fire detection and prevention.
Implementation Method 1
a resistance value of the temperature-sensing material varying with a temperature
Implementation Method 2
the first resistor is a thermistor
Data Source
AI summary
The present disclosure provides a temperature sensing cable, wherein a controller in a temperature-sensing control unit can sense the change in temperature nearby via a first temperature acquisition circuit and a second temperature acquisition circuit, and output an early warning signal to provide a high temperature warning (or fire warning). The early warning signal may carry the address information of the controller. By determining the position of the controller that sends out the early warning signal, the high temperature point (or firing point) can be accurately located. The present disclosure further provides a fire alarm method and a fire alarm system, which are implemented based on the above-mentioned temperature sensing cable. By performing a comprehensive judgment on the temperature field data information of multiple relevant temperature-sensing control units, false alarms can be reduced, especially false alarms caused by factors such as electromagnetic interference, humid environment, construction extrusion, and local rapid temperature rise.