Aircraft Electrical Link Leakage Current Protection System
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Solution Overview
Problem
High voltage direct current electrical systems in aircraft require effective protection against leakage currents to prevent electrical arcs and ensure safe energy transmission, as increased voltage levels pose risks due to insulation degradation and conductor breaks.
Innovation Solution
An electrical link with a protective sheath surrounding conductors, each with an insulating jacket and an integrated electrical protection system comprising a conductive sheath, circuit breaker, direct current generator, and leakage current detection assembly. The system rapidly interrupts current when abnormal leakage is detected, using a sequencer to activate the circuit breaker based on measured voltage comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage direct current is used to increase electrical power transmission capability, then power transmission capability is improved, but the risk of electrical arcs and insulation failure increases
Solution Approach 1:
The patent applies preliminary action by implementing a protection system that continuously monitors insulation resistance before electrical arcs can occur. The system proactively detects insulation degradation and triggers circuit breakers to interrupt current flow, preventing the harmful electrical arc effect from developing in the first place
Solution Approach 2:
The patent implements feedback through a monitoring device that continuously measures insulation resistance and provides real-time information to a control unit. This closed-loop feedback system adjusts the protection state dynamically, comparing measured values against threshold criteria to determine when to activate circuit breakers, thereby maintaining safety while enabling high power transmission
2Reliability
If protection systems are added to high voltage electrical links, then safety against electrical arcs is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrical link into separate protected segments, each with its own circuit breaker and monitoring. This modular approach isolates faults to specific segments, preventing system-wide failures while maintaining manageable complexity through localized protection units
Solution Approach 2:
The patent introduces an intermediary control unit that mediates between the monitoring device and circuit breakers. This intermediary processes measurement data, applies evaluation criteria, and triggers appropriate protection actions, simplifying the overall system architecture by centralizing the decision-making logic rather than requiring complex direct connections between all components
3Object-affected harmful factors
If rapid current interruption is implemented to prevent thermal damage, then protection effectiveness is improved, but response time requirements increase system complexity
Solution Approach 1:
The patent implements preliminary action by continuously monitoring insulation resistance before thermal damage can occur. The system maintains readiness to interrupt current by keeping circuit breakers in a pre-charged state, enabling rapid response when insulation degradation exceeds threshold values, thus preventing thermal arc damage without requiring complex emergency activation systems
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 solution effectively interrupts current in a few milliseconds, preventing damage from electrical arcs and high voltage propagation, ensuring safe energy transmission and maintaining the integrity of the protective sheath.
Implementation Method 1
a leakage current detection assembly connected to the conductive sheath and to the circuit breaker; the leakage current detection assembly of a conductor is configured to measure a current passing through the conductive sheath
Implementation Method 2
a circuit breaker arranged on the conductor and configured, when activated, to open and interrupt electrical current through the conductor
Implementation Method 3
a direct current generator connected to the conductive sheath and configured to generate a non-zero current in response to an activation signal
Data Source
AI summary
An electrical link including a protective sheath surrounding at least two conductors each covered by an insulating jacket and an electrical protection system includes: a conductive sheath on each of the insulating jackets, a circuit breaker for each conductor; a direct current generator generating a direct current to be successively applied to each conductive sheath; and a leakage current detection circuit for each conductive sheath; a sequencer successively supplying the direct current to each conductive sheath; the detection circuit measures a current in each conductive sheath and compares a voltage proportional to the current to a first and second ranges of values, the detection circuit activating the circuit breaker if: the voltage is outside of the first range of values while the current generator generates a non-zero current; or the voltage is outside of the second range of values.