Pyrotechnic Actuation for Ultra-Fast Electrical Protection
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Solution Overview
Problem
Existing electrical protection devices, such as those using ultra-fast fusible elements and circuit breakers, are not sufficiently rapid in responding to electrical faults, particularly short-circuit currents, especially for higher current ratings.
Innovation Solution
A multipolar electrical protection device with a pyrotechnic actuation system that includes a cut-off block with separable contacts, an electronic trigger system, and a pyrotechnic actuator with an explosive charge, allowing for rapid separation of contacts to interrupt current flow when a fault is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ultra-fast fusible elements are used to interrupt current quickly, then response speed is improved, but they are not suitable for certain current rating ranges and short-circuit fault types
Solution Approach 1:
A pyrotechnic actuator is introduced as an intermediary mechanism between the detection system and the contact separation function. The actuator converts chemical energy from a pyrotechnic charge into mechanical motion, enabling ultra-fast contact separation that works across different current ratings where traditional fusible elements fail.
Solution Approach 2:
The patent replaces the thermal-mechanical fusion process of traditional fusible elements with a pyrotechnic chemical-mechanical actuation system. This substitution enables controlled, ultra-fast contact separation through chemical energy conversion rather than relying on thermal melting, which is ineffective for certain current ranges.
2Adaptability or versatility
If conventional circuit breakers with separable contacts are used, then adaptability to different fault types is improved, but the opening mechanism is not fast enough for ultra-fast protection
Solution Approach 1:
The conventional mechanical opening mechanism of circuit breakers is replaced with a pyrotechnic actuation system. The pyrotechnic charge provides explosive force that separates contacts in microseconds, dramatically exceeding the speed of conventional spring-loaded or solenoid-based opening mechanisms while maintaining the ability to handle various fault types.
Solution Approach 2:
The patent changes the energy conversion parameters from gradual mechanical actuation to rapid chemical energy release. By controlling the pyrotechnic charge composition and configuration, the system achieves ultra-fast contact separation speeds while maintaining adaptability to different fault conditions through the same actuation mechanism.
3Speed
If a pyrotechnic actuation system is added to achieve ultra-fast response, then response speed is improved to less than one millisecond, but device complexity increases
Solution Approach 1:
The device is segmented into distinct functional modules: the pyrotechnic actuator module, the motion transmission system module, and the contact assembly module. This segmentation allows each component to be optimized independently and facilitates easier maintenance and replacement, reducing the practical complexity despite the advanced functionality.
Solution Approach 2:
The pyrotechnic actuation system is designed as a separable, extractable module that can be removed and replaced independently from the main circuit breaker body. This extraction capability simplifies maintenance and reduces operational complexity, as the complex pyrotechnic component can be serviced without affecting the entire device.
4Reliability
If multiple strikers are used with a motion transmission system to ensure simultaneous contact separation across all poles, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple strikers are merged into a unified motion transmission system where a single pyrotechnic actuator drives all strikers simultaneously through mechanical linkages. This combining approach ensures reliable simultaneous contact separation across all poles while reducing the number of independent pyrotechnic charges needed, thereby simplifying manufacturing compared to having separate actuators for each pole.
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 pyrotechnic actuation system enables ultra-fast current interruption with a reaction time of less than or equal to one millisecond, providing improved protection against short circuits and other faults, especially for currents greater than or equal to six times the nominal current, while maintaining a conventional architecture.
Implementation Method 1
each pyrotechnic actuator comprising an explosive charge and a movable part which moves from a retracted position to a deployed position when the charge explodes
Data Source
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AI summary
This multi-pole electrical protection device comprises a disconnect block with separable contacts containing at least one movable contact finger (15), a switching mechanism (22) capable of moving the contact fingers, and an electronic tripping system that controls the mechanism. The protection device includes a pyrotechnic actuation system (30) comprising: - a pyrotechnic actuator (302); - strikers (304) positioned opposite the contact fingers, each movable to a pressed position in which it pushes a contact finger; - a motion transmission system (306) to transform the movement of a movable part (314) of the pyrotechnic actuator to its deployed position into a simultaneous movement of all the strikers to the pressed position; the tripping system being configured to activate a pyrotechnic actuator when it detects an electrical fault.