Signaling Line Position Determination via Isolator Interval Halving
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Solution Overview
Problem
Existing methods for determining the position of a newly installed device in a hazard detection system, such as fire or gas detectors, are inefficient and time-consuming, especially in larger networks, requiring network restarts or additional communication equipment.
Innovation Solution
A method involving scanning the signaling line by opening and closing isolators to divide it into branches, using interval halving to precisely locate the device, which requires no additional equipment on the devices and completes in a few seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire network is restarted to determine topology by chain synchronization, then the position of newly installed devices can be determined, but the process becomes time-consuming in larger networks
Solution Approach 1:
The signaling line is divided into segments by opening isolators at known devices. Instead of scanning the entire network, the system segments the line into branches and performs binary search within the relevant segment, dramatically reducing the time required for position determination while maintaining accuracy.
Solution Approach 2:
The system performs a reduced version of the full topology scan by only scanning the relevant branch containing the newly installed device. By using isolators to block other branches, the system performs partial action (scanning only necessary portions) rather than excessive action (scanning the entire network).
2Loss of time
If detectors are equipped with additional communication means for automatic location, then position determination becomes faster, but the device complexity increases
Solution Approach 1:
The isolators, which are already present in each detector for their primary function of signal isolation, are repurposed to enable position determination. This multi-functional use of existing components eliminates the need for additional communication equipment while maintaining fast position determination capability.
Solution Approach 2:
The system uses the existing infrastructure (isolators and signaling line) to perform the position determination function without requiring external assistance or additional specialized equipment. The detectors serve themselves by utilizing their built-in isolators for the dual purpose of signal management and location identification.
Data Source
AI summary
In order to determine the position of a device newly introduced into a hazard detection system, the devices of which include an insulator and are connected to a control center by a warning line, the newly introduced device is interrogated multiple times from one side of the warning line. The insulator of a device with an already known topology is first opened, subdividing the warning line into two branches, and the branch wherein the newly introduced device is located is then determined. This interval halving process is repeated until the exact position of the newly introduced device is found. In its preferred implementation, the device is a hazard detector or an actuator.