Low-Voltage Breaker Contact Interlock via Interruption Unit Testing
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Solution Overview
Problem
Existing protective switching devices for low-voltage circuits lack sufficient safety features and operational reliability, particularly in detecting faults in electronic interruption units and preventing accidental closure of contacts.
Innovation Solution
A protective switching device with a mechanical isolating contact unit and an electronic interruption unit, featuring a measuring impedance to test the functionality of the electronic interruption unit by switching it between high and low resistance states, and preventing contact closure in case of fault conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical isolating contact unit is used to interrupt current flow, then the device achieves reliable circuit protection, but the complexity of the device increases due to the need for both mechanical and electronic components
Solution Approach 1:
The patent combines a mechanical isolating contact unit and an electronic interruption unit into a single integrated protective switching device. The mechanical unit provides robust circuit interruption capability, while the electronic unit offers precise control and fault detection. These two distinct systems are merged to work together, with the electronic unit controlling the mechanical contacts, thereby achieving both high reliability and coordinated operation without requiring entirely separate protection systems.
Solution Approach 2:
The protective switching device performs multiple functions through its dual-unit design: the mechanical isolating contact unit provides main circuit interruption and isolation, while the electronic interruption unit handles precise current control and fault detection. This multi-functional integration allows a single device to serve as both a protective relay and a circuit breaker, eliminating the need for separate devices and reducing overall system complexity despite the sophisticated internal architecture.
2Productivity
If semiconductor-based switching elements are used in the electronic interruption unit, then the device achieves precise current control and fast response, but the reliability decreases due to potential faults in semiconductor components
Solution Approach 1:
The control unit continuously monitors the operational state of the semiconductor-based switching elements in the electronic interruption unit. By implementing feedback mechanisms that track current flow, voltage levels, and switching element status, the system can detect potential faults early and respond appropriately. This feedback loop enables the control unit to maintain precise current control while simultaneously managing the reliability risks associated with semiconductor components through real-time monitoring and adaptive control.
Solution Approach 2:
The mechanical isolating contact unit serves as a backup or cushioning mechanism for the electronic interruption unit. In the event of semiconductor component failure, the mechanical unit can still provide circuit interruption capability, preventing complete system failure. This prior cushioning approach ensures that while the electronic unit provides precise control, the overall system reliability is maintained through the redundant mechanical protection capability.
3Object-affected harmful factors
If the electronic interruption unit is placed on the mains-side connection, then the device achieves better protection against upstream faults, but the difficulty of detecting and measuring faults increases due to the complex interaction between mechanical and electronic units
Solution Approach 1:
The protective switching device is segmented into distinct functional units with clear responsibility boundaries: the electronic interruption unit handles upstream fault protection on the mains-side connection, while the mechanical isolating contact unit provides load-side isolation. The control unit acts as a separate coordinating segment that manages both units. This segmentation allows each unit to specialize in its protective function while the control unit integrates their operations, making fault detection and measurement more manageable by isolating diagnostic functions to specific segments rather than requiring analysis of the entire system simultaneously.
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 enhances the safety and operational reliability of low-voltage circuits by ensuring that only a functional electronic interruption unit can switch on, thereby preventing dangerous conditions and ensuring reliable protection.
Implementation Method 1
a measuring impedance (ZM) is provided between two conductors (L, N) of the low-voltage circuit, wherein the measuring impedance (ZM) is connected on the one hand to the connection (APLG) between the mechanical isolating contact unit (MK) and the electronic interruption unit (EU)
Implementation Method 2
the electronic interruption unit (EU) can be switched by semiconductor-based switching elements into a high-resistance state of the switching elements to prevent a current flow or a low-resistance state of the switching elements for a current flow in the low-voltage circuit
Data Source
Figure 1
Figure 2
Figure 3~3A
AI summary
The invention relates to a circuit breaker device for protecting an electrical low-voltage circuit, said circuit breaker device comprising: • a housing having at least one grid-side connection and one load-side connection, • a mechanical separating contact unit which is connected to an electronic interruption unit in series, the mechanical separating contact unit being associated with the load-side connection and the electronic interruption unit being associated with the grid-side connection, • wherein the level of the current in the low-voltage circuit, in particular between the grid-side phase conductor connection and the load-side phase conductor connection, is ascertained, wherein, if current thresholds and/or current/time thresholds are exceeded, a process for preventing a current flow of the low-voltage circuit is initiated, • a measurement impedance is provided between two conductors of the low-voltage circuit, said measurement impedance being connected to the connection between the mechanical separating contact unit and the electronic interruption unit (EU).