Main Switch Disconnection Testing via Transformer Voltage Difference
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Solution Overview
Problem
The existing methods for testing the disconnection function of main switch devices in fuel cell systems are costly and labor-intensive.
Innovation Solution
A test method that generates a voltage variation on the low-voltage side of a transformer device, switches the negative main switch, and detects a voltage difference between the low voltage and the system voltage, comparing it to zero to assess the disconnection function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional testing methods are used to check the functionality of the main switch device, then the disconnection function can be verified, but the effort and cost required are relatively high
Solution Approach 1:
The system uses its own existing voltage monitoring capabilities to perform the disconnection function test. The control unit utilizes voltage information already being monitored during normal operation (both on the output side of the fuel cell system and on the low-voltage side of the transformer device) to automatically determine whether the disconnection function is operational, eliminating the need for separate testing equipment and procedures
Solution Approach 2:
The voltage monitoring system performs multiple functions: it monitors the fuel cell system during normal operation, monitors the transformer device, and simultaneously serves as the testing mechanism for the disconnection function. This multi-functional approach eliminates dedicated testing hardware and reduces overall system complexity
2Reliability
If a comprehensive test of the main switch device is performed, then the disconnection function reliability is improved, but the testing time and operational disruption increase
Solution Approach 1:
The system continuously monitors voltage information during normal operation, so when testing is needed, the data is already available. The control unit can immediately evaluate the disconnection function by analyzing pre-collected voltage information from the voltage monitoring system, eliminating the need for time-consuming separate testing procedures
Solution Approach 2:
The voltage monitoring operates continuously during normal system operation, maintaining readiness to perform disconnection function assessment at any time. This continuous monitoring ensures that testing can be performed instantly when needed without interrupting or delaying system operations
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 method allows for a cost-effective and simple detection of defective disconnection functions in main switch devices, applicable to both startup and shutdown operations without requiring new hardware.
Implementation Method 1
generating a voltage variation on the low-voltage side of a transformer device
Data Source
AI summary
The present invention relates to a test method for testing the disconnection function of a main switch device (110) of an electrical connection device (100) of a fuel cell system (200), the method having the following steps:generating a voltage variation (VV) on the low-voltage side (LVS) of a transformer device (120),switching a negative main switch (112) of the main switch device (110),detecting a voltage difference (VD) between a low voltage (LV) of the low-voltage side (LVS) of the transformer device (120) and a system voltage (SV) of the fuel cell system (200),comparing the voltage difference (VD) detected with a zero value (NW).