HVDC Relay Magnet Layout for Faster Arc Extinguishing
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Solution Overview
Problem
High-voltage DC relays face challenges in effectively extinguishing arcs due to weak magnetic field intensity near the arc starting point, particularly in large-load applications, which fails to meet the requirements of new energy vehicles and energy storage projects.
Innovation Solution
The design enhances arc extinguishing capability by strategically arranging two types of permanent magnets with different magnetic pole surfaces and polarities around the movable contact piece, along with U-shaped yokes and an anti-short circuit structure, to intensify the magnetic field and improve arc extinguishing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two permanent magnets are arranged at outer side of movable contact piece to achieve arc extinction, then arc blowing direction is improved and non-polarity need is met, but magnetic field intensity at arc starting point is weak
Solution Approach 1:
The patent divides the magnetic field generation into two independent parts: first permanent magnets arranged at outer sides of the movable contact piece for arc blowing direction control, and second permanent magnets arranged between the static contact leading-out terminals for enhancing magnetic field intensity at the arc starting point. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The patent applies different magnetic field characteristics to different locations: the first permanent magnets provide a magnetic field suitable for arc blowing direction at the contact ends, while the second permanent magnets provide enhanced magnetic field intensity specifically at the arc starting point (center of leading-out terminal). This local quality approach ensures optimal arc extinction performance at each critical location.
2Power
If ceramic cavity is made larger for large-load products, then load capacity is improved, but magnetic field intensity of arc extinguishing portion to arc starting point is reduced
Solution Approach 1:
The second permanent magnets act as an intermediary element that bridges the gap between the static contact leading-out terminals and the arc starting point. By placing these magnets specifically between the terminals, they create a concentrated magnetic field pathway that reaches the arc starting point effectively, even in larger ceramic cavities required for high-load applications.
Solution Approach 2:
The patent changes the magnetic field parameters by introducing second permanent magnets with specific polarity arrangements. The sides having polarity of the second permanent magnets face the corresponding first permanent magnets, and polarities are opposite, creating a synergistic magnetic field configuration that intensifies the field at the arc starting point without requiring a smaller ceramic cavity.
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
This configuration significantly enhances the magnetic field intensity at the arc starting point, accelerating arc extinguishing speed and improving the overall performance of high-voltage DC relays for demanding applications.
Implementation Method 1
two first permanent magnets respectively arranged at outer side of two ends of the movable contact piece... two second permanent magnets respectively arranged on the movable contact piece between the two static contact leading-out terminals
Implementation Method 2
permanent magnets are respectively arranged at outer side of two ends of the movable contact piece in a length direction, and the two permanent magnets are used to achieve arc extinction
Data Source
AI summary
A high-voltage DC relay for enhancing arc extinguishing capability includes two static contact leading-out terminals; a movable contact piece arranged under the two static contact leading-out terminals; two first permanent magnets respectively arranged at outer side of two ends of the movable contact piece in a length direction; two second permanent magnets respectively arranged on the movable contact piece between the two static contact leading-out terminals at positions where the movable contacts are in contact with the static contacts, and sides having polarity of the second permanent magnets facing the corresponding first permanent magnets, and polarities of the sides having polarity of the second permanent magnets is opposite to polarities of the sides of the first permanent magnets facing the positions where the movable contacts are in contact with the static contacts.