Variable Transformer Ratio for Short-Circuit Current Discrimination
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Solution Overview
Problem
Existing electrical power supply systems fail to ensure continuity of power and proper discrimination of protection devices during short-circuits, as the current limitation by converters does not align with the trigger levels of protection devices, leading to incomplete fault isolation and potential converter shutdown.
Innovation Solution
An adapter device with a variable transformer ratio and control system that modifies the current flowing to the load upon detecting a short-circuit, allowing the protection devices to quickly identify and isolate the fault without interrupting the power supply from the converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transformer delivers standard current during short-circuit, then the converter remains protected, but the protection devices cannot trigger to isolate the fault
Solution Approach 1:
The patent changes the current parameter delivered by the adapter device during a short-circuit event. By modifying the transformer ratio, the device increases the secondary current beyond what the converter would normally deliver during a fault, enabling downstream protection devices to operate at their designed trigger levels while the converter continues to limit its own output current.
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
Ensures the continuity of power supply and effective discrimination of protection devices by increasing the load current during short-circuits, allowing for timely fault isolation without converter shutdown, thus maintaining selectivity and reliability of electrical protection.
Implementation Method 1
an electrical transformer (30) with a variable ratio of transformation, an input terminal (40) adapted to be electrically connected to the electrical converter (16) and an output terminal (42) adapted to be electrically connected to the load (14)
Data Source
AI summary
A device (18) for adapting a power supply signal (S1) comprises a transformer (30), and a component for detecting a short circuit of an output end (42). The transformer (30) comprises the output end (42) for being electrically connected to a load (14) and an input end (41) for being electrically connected to an electric converter (16). The transformer (30) has a variable transformer ratio. The device (18) further comprises a part (7), which serves as a function for detecting the short circuit to control the transformer ratio of the transformer (30).