HVDC Switchyard Transfer Switches as Selector Switches
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Solution Overview
Problem
High voltage direct current (HVDC) switchyards require efficient circuit breakers capable of handling rising fault currents, but existing DC hybrid circuit breakers are expensive due to the design of main breakers, necessitating a more cost-effective solution for interconnecting and disconnecting sections of HVDC networks.
Innovation Solution
A switchyard design utilizing a single main circuit breaker and multiple transfer switches, where the transfer switches act as selector switches to reduce the number of main breakers, allowing individual disconnection of network sections, thereby minimizing the number of expensive main breakers and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC hybrid circuit breakers with main breakers are used for each section, then the current breaking capability is sufficient, but the cost becomes excessively high
Solution Approach 1:
The transfer switches are designed to serve dual purposes: as transfer switches within the hybrid circuit breaker and as selector switches for isolating different network sections. This multi-functionality eliminates the need for separate selector switches, reducing the overall number of main breakers required in the switchyard and thereby lowering cost while maintaining adequate current breaking capability through the hybrid breaker architecture
Solution Approach 2:
The invention combines the functions of transfer switches and selector switches into a single component set. By merging these functions, the patent reduces the total number of expensive main breakers needed, as the same transfer switches perform both the hybrid breaker function and the section selection function, thus addressing the cost issue while preserving reliability
2Adaptability or versatility
If multiple main breakers are installed for each section, then individual disconnection capability is achieved, but the device complexity and cost increase
Solution Approach 1:
The transfer switches perform multiple functions including acting as transfer switches for current commutation and as selector switches for isolating different network sections. This multi-functionality enables individual disconnection of any network section while using a reduced number of main breakers, thereby maintaining adaptability without increasing device complexity
Solution Approach 2:
The patent uses a smaller number of main breakers that are shared across multiple sections through the selector switch arrangement. Instead of having a dedicated main breaker for each section, the system copies the main breaker function across sections by selectively connecting different sections to the shared main breaker through the transfer switches, reducing overall complexity
Data Source
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AI summary
A high voltage direct current (HVDC) switchyard(300)is provided. The switchyard is arranged for interconnecting three or more sections(310, 320, 330)of an HVDC power network, such as transmission lines, converters, or any other type of HVDC equipment. The switchyard comprises at least one main circuit breaker (301) and at least four transfer switches(302-305). The at least one main circuit breaker and the at least four transfer switches are arranged so as to enable to individually disconnect any one of the at least three sections of the HVDC power distribution network. In an embodiment of the invention, the transfer switches which usually are comprised in direct current (DC) hybrid circuit breakers are used as selector switches,thereby reducing the number of main breakers in the switchyard.