Switch Drive Shaft Feedback for Reliable Substation Switching
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Solution Overview
Problem
Existing switch systems in substations, such as on-load tap-changers and circuit breakers, face reliability issues during operation due to potential malfunctions, which can have serious technical and economic consequences.
Innovation Solution
A switch assembly with a drive system equipped with a feedback system that determines at least two values for the position of the drive shaft, generating a feedback signal to influence motor operation, ensuring redundancy and plausibility checks to enhance operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single position detection system is used for the drive shaft, then the device complexity is low, but the reliability is insufficient due to potential malfunctions
Solution Approach 1:
The patent implements a feedback system that determines at least two independent values for the position of the drive shaft and generates a feedback signal based on these values. The control device uses this feedback to monitor position accuracy and detect malfunctions, thereby improving reliability through continuous verification of position data
Solution Approach 2:
The system prepares for potential failures by having redundant position detection capabilities in place before malfunctions occur. The feedback system is configured to detect errors and switch to alternative position values or safe operating modes in advance, cushioning against the impact of potential detection failures
2Reliability
If redundant position detection values are determined, then the reliability increases through plausibility checks, but the device complexity increases
Solution Approach 1:
The feedback system determines at least two independent position values and compares them through plausibility checks. When the values agree within a tolerance range, the system confirms accurate positioning. This feedback mechanism enables error detection without requiring completely separate redundant systems
Solution Approach 2:
The system monitors changes in position parameters and compares multiple determined values against each other. By analyzing parameter consistency and deviations, the system can detect malfunctions and maintain reliable operation without adding excessive complexity to the detection hardware
Data Source
AI summary
A switch assembly includes a switch; and a drive system for the switch. The drive system includes: a drive shaft connecting the drive system to the switch; a motor configured to drive the drive shaft; and a feedback system, which is configured to determine at least two values for a position of the drive shaft; and to generate a feedback signal on the basis of the at least two values; and a control device which is configured to influence an operation of the motor depending on the feedback signal.