Bypass Switch Vacuum Interrupter Contact Reliability
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Solution Overview
Problem
Existing bypass switches in voltage source converters face issues with reliable current flow due to poor contact maintenance, vulnerability to damage from transient peak currents, and lateral deflection during energy storage device explosions, leading to arching, overheating, and potential failure.
Innovation Solution
A bypass switch with a vacuum interrupter and a resilient biasing member directly abutting the moveable switch contact, eliminating the need for intermediate components, ensuring compact and reliable contact, and incorporating a second clamp member for secure electrical connection, along with a switch chassis design that supports the moveable contact and includes guide members for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bypass switches are used with intermediate components to connect the resilient biasing member to the switch contact, then the structure is more complex and larger, but the contact reliability is poor leading to arching and overheating
Solution Approach 1:
The patent removes intermediate components (such as insulating spacers or connecting elements) from the biasing mechanism, allowing the resilient biasing member to directly abut the moveable switch contact. This extraction of unnecessary intermediate elements simplifies the structure and ensures direct, reliable contact between the biasing member and switch contact, eliminating contact instability issues.
Solution Approach 2:
The patent eliminates the need for intermediate components that previously mediated between the resilient biasing member and the switch contact. By removing this intermediary layer, the design achieves direct contact and force transmission, improving reliability while reducing structural complexity.
2Reliability
If existing bypass switches are used without direct abutment, then the structure allows more components, but the contact maintenance is poor leading to arching
Solution Approach 1:
The patent extracts and removes intermediate components from the biasing mechanism, allowing the resilient biasing member to directly abut the moveable switch contact. This direct connection ensures reliable current flow maintenance while reducing the total number of components in the system.
3Strength
If existing bypass switches are used without direct biasing member contact, then manufacturing is easier with more components, but the switch is vulnerable to damage from transient peak currents
Solution Approach 1:
The patent removes intermediate components that previously separated the resilient biasing member from the switch contact. This direct abutment strengthens the mechanical connection and improves the switch's ability to withstand transient peak currents and electromagnetic forces, while simultaneously reducing structural complexity.
4Temperature
If existing bypass switches are used with intermediate components, then the structure is larger, but the contact spacing is poor leading to overheating
Solution Approach 1:
The patent removes intermediate components from the biasing mechanism, allowing direct contact between the resilient biasing member and the moveable switch contact. This eliminates air gaps and poor contact interfaces that cause overheating, while reducing the overall volume of the switch assembly.
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 provides a reliable and compact bypass current flow path, reducing the risk of arching and overheating, enhancing the switch's durability and ability to handle high currents, enabling cost-effective production of high-current-rating chain-link modules for STATCOM converters.
Implementation Method 1
a resilient biasing member arranged in abutment with the second switch contact to urge the second switch contact towards its second position
Implementation Method 2
a vacuum interrupter mounted thereon, the vacuum interrupter including first and second switch contacts
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
In the field of bypass switches for chain-link modules there is a need for an improved such bypass switch. A bypass switch (40), for a chain-link module (26) operable with other chain-link modules (26) to form a chain-link converter (24) to selectively provide a stepped variable voltage source within a voltage source converter (10), comprises a switch chassis (42) which has a vacuum interrupter (46) mounted thereon. The vacuum interrupter (46) includes first and second switch contacts (50, 52). The first switch contact (50) is fixed relative to the switch chassis (42) and the second switch contact (52) is moveable relative to the switch chassis (42), whereby the second switch contact (52) is moveable between a first position in which it is spaced from the first switch contact (50) wherein the bypass switch (10) does not provide a bypass current flow path and a second position in which the second switch contact (52) abuts the first switch contact (50) wherein the bypass switch (10) provides a bypass current flow path. The bypass switch (40) also includes a resilient biasing member (68) that is arranged in abutment with the second switch contact (52) to urge the second switch contact (52) towards its second position. Additionally, the bypass switch (40) also includes an interlock (74) which is configured to hold the second switch contact (52) in its first position against the urging of the resilient biasing member (68). The interlock (74) is selectively operable to release the second switch contact (52) from its second position whereby the resilient biasing member (68) moves the second switch contact (52) into its second position and the bypass switch (10) provides a bypass current flow path.