Surge Protector Double-Trip Mechanism for Reliable DC Arc Isolation
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Solution Overview
Problem
Existing surge protection devices (SPDs) have low trip reliability and poor arc extinguishing effect in high-voltage direct current (DC), primarily due to their single mechanical trip mechanism, which can lead to aggravated circuit accidents when deteriorated.
Innovation Solution
An SPD with a double-trip mechanism featuring two independent trip structures, including a first and second tension spring system, where the trip directions of the springs are opposite, ensuring that one mechanism can function even if the other fails, and incorporating a guiding portion and arc-absorbing groove for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single mechanical trip mechanism is used in SPD, then the device structure is simple, but the trip reliability is low and arc extinguishing effect is poor
Solution Approach 1:
The trip mechanism is divided into two independent subsystems: a first trip structure with a slider and first tension spring, and a second trip structure with a reed and second tension spring. Each subsystem can independently execute the trip function, ensuring that if one subsystem fails, the other can still reliably perform the trip operation, thereby resolving the contradiction between reliability and structural complexity.
Solution Approach 2:
The patent introduces opposite trip directions for the two tension springs as a key parameter change. The first tension spring is configured to extend in the normal state and contracts to drive the slider toward the electrode, while the second tension spring is configured to extend in the normal state and contracts to drive the reed away from the electrode. This parameter change creates independent trip pathways that enhance reliability without excessive complexity.
2Speed
If the first tension spring is extended in normal state, then the trip action is rapid when triggered, but the spring occupies more space
Solution Approach 1:
The patent utilizes the spatial dimension by configuring the two tension springs to operate in opposite directions. The first tension spring operates in one dimensional direction to drive rapid trip, while the second tension spring operates in the opposite dimensional direction to provide backup trip capability. This dimensional arrangement allows both springs to be compactly integrated without excessive space occupation, while maintaining rapid trip speed when triggered.
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 double-trip mechanism enhances trip reliability by ensuring at least one mechanism operates normally, reducing abnormal tripping and improving arc extinguishing, thereby preventing circuit accidents.
Implementation Method 1
the first tension spring includes one end connected to the frame, and the other end connected to the slider; when the SPD is triggered, the first tension spring drives the slider to move to the electrode
Implementation Method 2
the second tension spring includes one end connected to the frame, and the other end connected to the reed; when the SPD is triggered, the second tension spring drives the reed to move toward a direction away from the electrode
Data Source
AI summary
A surge protection device (SPD) with a double-trip mechanism includes two trip structures on a frame, where the two trip structures are respectively a first trip structure and a second trip structure; the first trip structure includes a slider and a first tension spring; the first tension spring includes one end connected to the frame, and the other end connected to the slider; the second trip structure includes a second tension spring; the second tension spring includes one end connected to the frame, and the other end connected to the reed; and when the SPD is triggered, the first tension spring drives the slider to move to the electrode and be located between the electrode and the reed, and the second tension spring drives the reed to move toward a direction away from the electrode.