Integrated Test Switch Unit for Substation IEDs
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Solution Overview
Problem
Conventional test systems for intelligent electronic devices in electrical power generation and distribution systems require manual insertion and alignment of separate units, leading to increased human error, effort, and complexity, especially when testing multiple devices.
Innovation Solution
A singular test switch unit with a rotatable cam and profiled elements that engages with contact elements to open, short, or isolate trip, CT, and VT circuits, eliminating the need for a separate test handle and reducing manual effort by integrating all necessary functions into a single, simpler unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate test units with individual switches are used for each test function, then each test function can be independently controlled, but the complexity of the test system increases and human error in operation increases
Solution Approach 1:
The patent combines multiple separate test switch assemblies into a single integrated test switch assembly. This single assembly includes a common handle that simultaneously controls multiple test switches (first test switch, second test switch, third test switch) for different test functions (trip circuit, CT circuit, VT circuit). The merging eliminates the need for multiple independent switches while maintaining the ability to independently control each test function through the common handle mechanism.
Solution Approach 2:
The common handle serves multiple functions by simultaneously controlling different test switches for different test circuits. A single operational element (the common handle) provides universal control over trip circuit testing, CT circuit testing, and VT circuit testing, eliminating the need for separate control mechanisms for each test function.
2Adaptability or versatility
If manual insertion and alignment of separate test units is required, then each device can be tested individually, but the effort and time required increases significantly
Solution Approach 1:
The patent merges multiple separate test units into a single integrated test switch assembly that can be inserted as one unit. The assembly includes multiple test switches for different circuits (trip, CT, VT) that are pre-configured and interconnected, eliminating the need for manual insertion and alignment of separate units for each test function.
Solution Approach 2:
The test switch assembly is pre-configured with all necessary connections and alignments before insertion. The common handle is pre-positioned to simultaneously engage multiple test switches, and the internal connections between test switches and test circuits are established in advance during manufacturing, eliminating the need for field adjustment and alignment.
3Adaptability or versatility
If multiple separate test switches are used, then each test circuit can be controlled independently, but the probability of human error in operation increases
Solution Approach 1:
The patent combines multiple independent test switch controls into a single common handle mechanism. This unified control mechanism reduces the number of independent operational elements from three (one for each test switch) to one, thereby reducing the probability of human error while maintaining the ability to independently control each test circuit through the integrated switch mechanism.
Data Source
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AI summary
Examples of a test switch unit (100, 300, 600, 900, 1200, 1500) for testing an IED are described. Each of the test switch units may be utilized for opening of a trip circuit, the shorting of a CT circuit and subsequently the isolation of a VT circuit, respectively. Once the trip circuit has been opened, and the CT/VT circuits have been shorted and isolated, respectively, the IED may be tested by providing appropriate test signals. The opening, shorting and isolation function of the test switch units are triggered simultaneously by operating a lever (118, 324, 618) connected to a common shaft (116, 322, 616) which extends through all test switch units, wherein cams (114, 320, 614) located on the shaft open and close contacts of each test switch unit to achieve the respective function.