Transfer Switch Timing for Accurate Load Transfer Measurement
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Solution Overview
Problem
Existing methods for measuring load transfer times in electrical systems are manual, labor-intensive, potentially dangerous, and prone to inaccurate results, often requiring expensive equipment like oscilloscopes.
Innovation Solution
A method and system using a timing device to automatically measure load transfer times through a transfer switch, capable of identifying contact lifts and landings, employing filtering techniques to ignore noise from mechanical bouncing, and supporting different transfer modes with low-cost, low-voltage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement procedures using expensive equipment like oscilloscopes are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex measurement equipment (oscilloscopes, timing boxes) with a simple, low-cost timer device that can be easily deployed and discarded after use. The timer uses basic electronic components and simple circuitry to achieve adequate measurement precision without requiring sophisticated instrumentation.
Solution Approach 2:
The patent replaces manual mechanical measurement procedures with an automated electronic timing system. The timer automatically detects contact lift and land events through electrical signals and calculates transfer time without requiring manual operation or complex mechanical measurement apparatus.
2Measurement precision
If manual measurement procedures are used, then measurement capability is achieved, but ease of operation deteriorates due to labor intensity
Solution Approach 1:
The timer device is designed to automatically perform the entire measurement process without requiring skilled technicians to manually operate complex equipment. The device self-configures, automatically detects transfer events, calculates timing, and provides results, making the measurement process as simple as connecting the device to the circuit.
Solution Approach 2:
The patent changes the operational parameters of the measurement system from manual control to automated detection. The timer monitors electrical parameters (voltage, current) and automatically identifies contact events based on predefined thresholds, eliminating the need for manual measurement procedures.
3Measurement precision
If manual measurement procedures are used, then measurement can be performed, but safety deteriorates due to potential danger to technicians
Solution Approach 1:
The timer device serves as an intermediary between the high-voltage circuit and the measurement process. It electrically couples to the circuit under test but isolates the operator from direct exposure to hazardous voltages, performing measurements remotely and safely without requiring technicians to work directly with live electrical components.
4Measurement precision
If filtering techniques are applied to ignore contact bounce noise, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The timer applies a simple filtering approach that ignores brief signal fluctuations (contact bounce) below a predetermined time threshold. Rather than implementing complex signal processing algorithms, the device uses a straightforward time-based filter that discards short-duration noise events, achieving adequate precision with minimal added complexity.
Data Source
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AI summary
A computer-implemented method and system are provided to measure a time of a load transfer for an electrical system. A selection of a transfer mode is received, such as a closed or open transition transfer mode. Electrical signals from sensing leads or signals derived therefrom are monitored to sense a supply state of power from first and second power sources on the electrical system to a load. The sensing leads are connectable or couplable to the electrical system or a component thereof according to the transfer mode being implemented. An occurrence of a contact lift and an occurrence of a contact landing, which are associated with a load transfer operation, are identified from the monitored electrical signals or signals derived therefrom. A load transfer time is measured based on a timing of the identified occurrences of the contact lift and landing, and the selected transfer mode, and outputted.