Short Circuit Isolator for Loop Systems
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Solution Overview
Problem
Existing systems for locating and isolating short circuits in loop-configured systems, such as fire protection and intrusion detection systems, are inefficient and often require external control panels or power resets, leading to prolonged downtime and potential safety hazards.
Innovation Solution
A method utilizing a binary search algorithm to iteratively divide the loop into subsets, determining the location of a short circuit without external control, and isolating it without power reset, using programmable short circuit isolator circuits that can operate independently of the power supply and control panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional linear methods are used to locate short circuits by checking each segment in turn, then the system can identify the fault location, but the time taken to locate and isolate the short circuit is excessively long
Solution Approach 1:
The loop is divided into multiple electrically isolatable segments with isolator switches at each component. This segmentation enables the binary search algorithm to systematically narrow down the short circuit location by isolating segments in a hierarchical manner, reducing the time required compared to checking each segment sequentially.
Solution Approach 2:
The system dynamically adjusts the isolation strategy based on real-time electrical measurements. The binary search algorithm dynamically selects which isolator switches to operate at each step, adapting the search path based on whether the short circuit is detected in the first or second subset of segments, thereby minimizing the number of steps required to locate the fault.
2Ease of operation
If external control panels or power resets are used to manage short circuits, then the system can restore functionality, but the complexity of control logic increases and downtime is prolonged
Solution Approach 1:
Each component in the loop is equipped with an isolator switch and control logic that enables it to autonomously participate in the short circuit isolation process. The components can independently detect electrical changes, execute isolation commands, and restore functionality without requiring external control panel intervention or power resets, thereby simplifying overall system operation.
Solution Approach 2:
The isolator switches and control logic are integrated into each component, giving each component multiple functions: normal operation, short circuit detection, isolation execution, and restoration. This multi-functionality eliminates the need for separate external control systems and reduces overall system complexity despite the added capabilities at each node.
3Measurement precision
If the loop is divided into many electrically isolatable segments to improve fault isolation precision, then the location accuracy increases, but the device complexity and coordination requirements increase
Solution Approach 1:
The binary search algorithm provides a dynamic coordination strategy that adapts to the number of segments and the location of the short circuit. Rather than requiring static pre-coordination of all possible isolation scenarios, the system dynamically determines the isolation sequence based on real-time electrical measurements, simplifying the coordination requirements while maintaining high location precision.
Solution Approach 2:
The system pre-configures the loop with isolator switches at each component and establishes the binary search protocol in advance. This preliminary setup enables rapid response when a short circuit occurs, as the coordination logic is already in place and components can immediately execute the isolation sequence without complex real-time negotiations, thereby reducing both complexity and response time.
Data Source
AI summary
A method of locating a short circuit in a system including a set of components electrically connected in a loop, such as a fire protection system. It is iteratively determined in which location of a set of possible locations a short circuit is located. Each iteration involves determining in which of two subsets of a set of remaining locations the short circuit is located, and eliminating from the set of remaining locations the subset in which the short circuit is determined not to be located.