Heat Detection Circuit Switching for Accurate Short Fault Location
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Solution Overview
Problem
Existing heat detection devices face inaccuracies in identifying short-circuited sites due to varying resistances when conductive wires are short-circuited, especially when insulators soften gradually, leading to errors in estimating the site of heat generation.
Innovation Solution
A heat detection device with a short-circuit position detector that forms multiple two-terminal circuits by switching connections between conductive wires and reference contacts, allowing for the determination of unknown resistances through simultaneous equations, thereby accurately estimating the short-circuited site based on resistance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the resistance between conductive wires at the short-circuited site is estimated to be zero, then the calculation is simplified, but the estimation of the short-circuited site has large errors when insulators soften gradually
Solution Approach 1:
The patent changes the parameter assumption from resistance=0 to resistance=variable value. By measuring the actual resistance value at the short-circuited site and using it in the calculation, the patent resolves the contradiction between simplified calculation and accurate estimation. The resistance value becomes a measurable parameter that accounts for gradual insulator softening.
Solution Approach 2:
The patent replaces the theoretical assumption (mechanical model of zero resistance) with actual electrical measurement. By using a measurement system to detect the real resistance value and substituting it into the calculation formula, the patent achieves both practical accuracy and computational feasibility.
2Measurement precision
If multiple two-terminal circuits are formed by switching connections, then unknown resistances can be determined through simultaneous equations, but the device complexity increases
Solution Approach 1:
The patent introduces dynamic switching to transform a static circuit into a dynamic measurement system. The switch component allows the circuit configuration to change states, enabling multiple measurement equations to be formed from the same physical components. This resolves the contradiction by using temporal dynamics rather than spatial complexity.
Solution Approach 2:
The patent makes the same circuit components serve multiple measurement functions through switching. The same conductive wires and contacts are used in different circuit configurations to measure different resistance values, eliminating the need for separate measurement circuits for each resistance value.
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
The device accurately identifies the short-circuited site by determining the resistances of the conductive wires, which have a linear relationship with their lengths, enabling precise location of heat generation even in cases with varying resistance values.
Implementation Method 1
The insulator softens at a preset temperature
Implementation Method 2
a voltage detector that detects a target voltage between the first target contact and the second target contact
Data Source
AI summary
A heat detection device includes a short-circuit position detector that detects a short-circuited site at which a first conductive wire and a second conductive wire are short-circuited. The short-circuit position detector includes a switch including at least one make-break contact. The switch switches connection of first branches having a first resistance, second branches having a second resistance, and a third branch having a third resistance to cause the first branches, the second branches, and the third branch to be included in at least one two-terminal circuit and to form at least three two-terminal circuits.