Disconnecting Switch for Electrochemical DC Voltage Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrochemical systems, such as electrolyzers and fuel cells, can generate high DC voltages during maintenance processes, posing safety risks due to unexpected voltage buildup, especially when disconnected from the AC/DC converter, which can delay maintenance and increase safety hazards.
Innovation Solution
A disconnecting device with a first switch that connects the DC connections of the electrochemical system, allowing for safe discharge and short-circuiting, ensuring a defined and safe state for maintenance, by establishing an electrical connection between the DC connections and using pre-charging resistors for controlled voltage reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrochemical system is disconnected from the AC/DC converter for maintenance, then maintenance access is improved, but dangerous voltage buildup occurs creating safety hazards
Solution Approach 1:
A first switch is introduced as an intermediary component between the DC connections of the electrochemical system. This switch acts as a mediator that can safely discharge accumulated voltage by establishing a controlled electrical connection between DC connections, eliminating the dangerous voltage buildup while maintaining maintenance accessibility
Solution Approach 2:
The first switch is configured to establish a voltage discharge path before maintenance personnel access the disconnected electrochemical system. By performing this preliminary discharge action, the system eliminates dangerous voltages in advance, ensuring safety during subsequent maintenance operations
2Reliability
If disconnecting switches are used to isolate the electrochemical system, then safety isolation is improved, but additional equipment complexity is introduced
Solution Approach 1:
The first switch performs multiple functions: it acts as a disconnecting element for safety isolation, a discharging element for voltage elimination, and a controlling element for system state management. By combining these functions into a single component, the invention achieves reliable safety isolation without proportionally increasing equipment complexity
Solution Approach 2:
The invention merges the disconnecting function and the voltage discharging function into a single integrated switch mechanism. This consolidation eliminates the need for separate discharge resistors or additional switching equipment, thereby achieving safety isolation while minimizing added complexity
3Object-generated harmful factors
If load resistors are used to discharge the electrochemical system, then voltage reduction is achieved, but installation risks and temporary usage limitations occur
Solution Approach 1:
The first switch serves as a safe intermediary that enables voltage discharge without requiring physical installation of load resistors on the charged system. It provides a controlled discharge path through the switch mechanism itself, eliminating installation risks while achieving effective voltage reduction
Solution Approach 2:
Instead of using permanent or semi-permanent load resistors that require careful installation and removal, the invention employs a simple switch mechanism that can be rapidly deployed and removed without risk. The switch provides temporary discharge capability when needed, then returns to its isolated state, avoiding the hazards of installing dissipative elements on live systems
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
Enables safe maintenance by preventing dangerous voltage buildup and reducing the risk of electrical hazards during maintenance, while simplifying the circuit and reducing costs by avoiding additional galvanic separation and equipment.
Implementation Method 1
closing a first switch of the disconnecting device to establish an electrical connection between the DC connections
Implementation Method 2
the electrochemical system can be discharged via the ohmic resistor when the first switch is closed
Data Source
AI summary
The disclosure relates to a method for establishing a defined state in an electrochemical system connected to an AC/DC converter via a switch disconnector to exchange electric power. At least one DC connection of the electrochemical system is connected to the AC/DC converter via the disconnecting switch. The method includes, in a first operating state, closing a first switch to establish an electric connection between the DC connections of the electrochemical system. The application additionally relates to a disconnecting device, a power converter, and to an assembly.