HVDC Electrical Protection System with Conductive Sleeve
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Solution Overview
Problem
High-voltage direct current (HVDC) electrical installations in aircraft face challenges with existing circuit breakers, which are not optimized for secure power transmission, leading to potential electric arcs and spatial constraints that increase aircraft size and fuel consumption.
Innovation Solution
An electrical protection system with sensors of different types to measure non-electrical and electrical physical quantities, a control unit that commands a circuit breaker to open when abnormal phenomena are detected, preventing electric arcs by using a sliding time window to validate anomalies across multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If prior-art circuit breakers are used for HVDC power transmission, then the system structure is simple, but large safety distances are required between electrical conductors and the fuselage to prevent electric arcs, increasing aircraft size and fuel consumption
Solution Approach 1:
A conductive sleeve is introduced as an intermediary component between the electrical conductor and the fuselage. The sleeve is biased with a voltage of opposite polarity to the conductor, creating an equipotential zone that prevents electric arc formation. This mediator allows reduction of the safety distance while maintaining protection against arcing to the fuselage.
Solution Approach 2:
The invention changes the electrical parameter (voltage potential) of the protective element. By biasing the conductive sleeve with a voltage of opposite polarity to the electrical conductor, the electric field distribution is modified, preventing arc formation and enabling reduced safety distances in HVDC systems.
2Ease of manufacture
If prior-art circuit breakers are used for HVDC power transmission, then the system is easier to manufacture, but electric arcs may occur between electrical conductors and the fuselage, causing thermal damage
Solution Approach 1:
The conductive sleeve acts as a protective intermediary that prevents direct arcing between the electrical conductor and the fuselage. By maintaining a controlled potential difference, it eliminates the harmful thermal effects of electric arcs while preserving the relative simplicity of the circuit breaker design.
Solution Approach 2:
The conductive sleeve is pre-biased with opposite polarity voltage to create a protective barrier before any arcing can occur. This beforehand cushioning prevents the harmful effects of electric arcs by establishing a protective electrical field in advance.
3Object-affected harmful factors
If large safety distances are maintained between electrical conductors and the fuselage, then electric arc damage is prevented, but the aircraft size increases and fuel consumption increases
Solution Approach 1:
The conductive sleeve serves as a compact protective intermediary that provides electric arc prevention without requiring large safety distances. This enables maintaining fuselage size and fuel consumption at acceptable levels while ensuring protection against arcing damage.
Solution Approach 2:
By changing the electrical parameter (applying opposite polarity voltage) to the protective element, the invention achieves effective arc prevention in a compact configuration, avoiding the need for large safety distances that would increase aircraft size and fuel consumption.
4Device complexity
If conventional electrical protection systems are used, then the system structure is simple, but detection of anomalies anywhere in the electrical installation is limited
Solution Approach 1:
The protection system is segmented into multiple independent sensing zones along the electrical conductor, each with its own conductive sleeve and voltage biasing. This segmentation enables localized detection of anomalies anywhere in the electrical installation while maintaining overall system reliability.
Solution Approach 2:
The system incorporates feedback through monitoring the voltage on the conductive sleeve relative to the fuselage. When the monitored voltage exceeds a threshold, indicating a potential arc or anomaly, the system triggers an alarm or shuts down the conductor, providing reliable anomaly detection.
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
Enhances the detection and prevention of anomalies in HVDC electrical installations, reducing the risk of electric arcs and improving spatial efficiency by allowing for secure and reliable power transmission.
Implementation Method 1
a conductive sleeve placed around the insulating cover
Implementation Method 2
a biasing module configured to bias the conductive sleeve with a voltage (of constant and pre-set value)
Data Source
AI summary
An electrical protection system protects a high-voltage DC electrical installation and comprises at least one sensor of first type configured to perform measurements of a non-electrical physical quantity, at least one sensor of second type configured to perform measurements of an electrical physical quantity, and a control unit connected to said at least one sensor of first type and to said at least one sensor of second type. The control unit commands a circuit breaker of the high-voltage DC electrical installation to open when, in a sliding time window, an abnormal non-electrical phenomenon is detected by virtue of the measurements of said at least one sensor of first type and when, furthermore, an abnormal electrical phenomenon is detected by virtue of the measurements of said at least one sensor of second type.