HVDC Bypass Switch Structure for Insulation and Contact Pressure
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Solution Overview
Problem
Existing high-speed bypass switches in HVDC transmission systems face challenges with insulation performance between the actuator and bus bar, requiring additional insulation design and potentially generating noise, and struggle with applying sufficient contact pressure due to the need for high-spring constant springs, which are costly and difficult to manufacture.
Innovation Solution
The bypass switch design includes an insulating cover between the actuator and the second bus bar, eliminating the need for external insulation and using a cylindrical movable part extension rod to accommodate a contact spring, allowing for improved insulation and reduced noise, enabling the use of commercially available springs and enhancing contact pressure and operational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional insulation design is added between actuator and bus bar, then insulation performance is improved, but device complexity increases
Solution Approach 1:
The insulating cover integrates multiple functions: it provides insulation between the actuator and bus bar, serves as a structural housing for the movable part extension rod, and acts as a mounting support for the actuator. By combining these functions into a single component, the patent improves insulation performance while avoiding the need for separate insulation elements, thus not increasing device complexity.
2Force
If high-spring constant springs are used to apply sufficient contact pressure, then contact pressure is improved, but ease of manufacture deteriorates
Solution Approach 1:
The contact spring is nested inside the movable part extension rod, utilizing the internal space of the rod structure. This nesting arrangement allows the use of commercially available springs with standard spring constants, as the nested configuration provides mechanical advantage through the lever arm effect, achieving sufficient contact pressure without requiring specially manufactured high-spring constant springs.
3Ease of manufacture
If cylindrical movable part extension rod is used to accommodate contact spring, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The cylindrical movable part extension rod serves multiple functions: it acts as a structural connector between the movable contact and actuator, provides a housing for the contact spring, and serves as a guide for the latch plate. By making the extension rod multi-functional, the patent achieves the desired contact pressure using standard springs while not actually increasing device complexity, as the same component performs multiple roles.
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 design improves insulation performance, reduces noise, and allows for faster operation with better control over the movable contact's stroke, eliminating the need for expensive high-spring constant springs and enhancing the overall efficiency of the bypass switch.
Implementation Method 1
The movable contact 21 is separated from the fixed contact 22 as the latch plate 32 is attracted to the permanent magnet 4 by the magnetic force of the permanent magnet 4 disposed adjacent to the actuator 52
Implementation Method 2
The actuator 52 is exploded by an electrical signal to supply driving force for moving the movable contact 21
Data Source
AI summary
The present disclosure relates to a bypass switch used in a super-high voltage direct current transmission sub-module including a case; a first bus bar; a second bus bar; a fixing contact provided in a hollow part and connected to the first bus bar; a movable contact provided in the hollow part, and connected to the second bus bar so as to come into contact with or be separated from the fixing contact; an insulating cover coupled to the rear surface of the second bus bar, and having an accommodation part therein; a movable part extension rod provided on the accommodation part and coupled to the movable contact; and an actuator provided on the rear part of the insulating cover, and providing power for moving the movable part extension rod.