Vertical Thyristor Switch Layout for Low-Discharge Surge Arresters
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Solution Overview
Problem
Existing thyristor switches for controllable surge arresters are not well integrated with the surge arrester body, occupy a large area, are not easy to expand, have high partial discharge levels, are not suitable for outdoor operation, and exhibit large leakage currents.
Innovation Solution
A compact vertical thyristor switch design for controllable surge arresters, featuring a switch core body with thyristor valve string sections, a self-cooled saturable reactor, driving units, a voltage equalizing assembly, and an insulating sleeve, which is encapsulated in a compact structure suitable for outdoor operation and easy expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional thyristor switch design is used, then the surge arrester can control switching overvoltage, but the switch occupies large area and is difficult to expand
Solution Approach 1:
The thyristor switch is divided into multiple valve string sections that can be independently arranged and connected. Each section contains thyristors, reactors, and driving units as modular components, allowing the overall structure to be segmented for compact arrangement while maintaining expandability by adding or removing sections as needed.
Solution Approach 2:
The patent transitions from a horizontal arrangement to a vertical arrangement of the thyristor switch components. The valve string sections are stacked vertically within the insulating sleeve, utilizing the vertical dimension to reduce the horizontal footprint and occupied area while preserving the functional expandability of the system.
2Reliability
If existing thyristor switch structure is used, then switching overvoltage can be limited, but the structure is complex and occupies large area
Solution Approach 1:
Multiple functional components are merged into an integrated vertical structure within a single insulating sleeve. The valve string sections, each containing thyristors, reactors, and driving units, are combined and arranged vertically, reducing structural complexity while maintaining the reliability of switching overvoltage limitation through the coordinated operation of integrated components.
3Object-affected harmful factors
If conventional thyristor switch design is used, then surge protection function is provided, but partial discharge level is high and leakage current is large
Solution Approach 1:
The patent optimizes the local electrical characteristics of different components within the thyristor switch. The insulating sleeve provides enhanced local insulation quality, the reactors are positioned to minimize electromagnetic interference and partial discharge, and the thyristor valve string sections are configured to reduce leakage current paths, thereby reducing partial discharge levels while maintaining surge protection effectiveness.
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 design reduces the height and influence on potential distribution of the surge arrester body, minimizes partial discharge and leakage current, and allows for flexible expansion, making it suitable for outdoor use and reducing equipment costs.
Implementation Method 1
a self-cooled saturable reactor
Implementation Method 2
thyristor valve string sections
Data Source
AI summary
A vertical thyristor switch for a controllable surge arrester includes an insulating sleeve and a vertical cylindrical switch core body encapsulated inside the insulating sleeve. The switch core body includes thyristor valve sections, a reactor, driving units, a voltage equalizing assembly section, a structural member and a connecting member; and after being connected to the driving units on one side of the thyristor valve sections, the thyristor valve sections are arranged, together with the voltage equalizing assembly section, in a space of a lower section of the structural member, an upper section of the structural member is provided with the reactor, and components inside the switch core body are electrically connected through the connecting member.