Meter Switch Position Sensing via Line-Load Signal Matching
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Solution Overview
Problem
Conventional methods for determining the position of a remote disconnect switch in electric meters, such as using a proximity switch, are complex and costly, and fail to accurately detect switch malfunctions or manual tampering, leading to difficulties in maintaining accurate service operations.
Innovation Solution
A position sensing module that calculates a match indicator by comparing electrical characteristics, such as voltages and currents, between the line-side and load-side of the meter over a predetermined period, to determine the position of the switch, thereby providing accurate and cost-effective remote sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a proximity switch is used to determine the position of the remote disconnect switch, then the switch position can be inferred, but the design becomes electrically and mechanically more complex and the cost increases
Solution Approach 1:
The patent extracts the position detection function from a separate proximity switch mechanism and integrates it into the existing meter circuitry by monitoring electrical characteristics. This eliminates the need for additional mechanical or electrical proximity sensing components, thereby reducing device complexity while maintaining position detection capability.
Solution Approach 2:
The existing meter circuitry is made multi-functional by using it for both power measurement and switch position detection. The same electrical characteristic monitoring that serves the meter's primary function is also used to infer switch position, eliminating the need for dedicated position sensing components and reducing overall system complexity.
2Measurement precision
If a proximity switch is used to determine the position of the remote disconnect switch, then the switch position can be inferred, but the cost of the meter increases
Solution Approach 1:
The patent removes the need for expensive additional proximity switch components by extracting the position detection capability from separate hardware and implementing it through software-based analysis of existing electrical characteristics. This significantly reduces component costs and manufacturing complexity.
Solution Approach 2:
The patent uses inexpensive electrical characteristic measurements that are already being taken by the meter for other purposes, rather than investing in expensive dedicated position sensing hardware. This approach uses readily available data at minimal additional cost to achieve position detection.
3Device complexity
If conventional methods are used to detect switch position, then the system is simpler, but the ability to detect switch malfunctions and manual tampering is reduced
Solution Approach 1:
The patent implements feedback by continuously monitoring electrical characteristics and comparing them against expected values for different switch positions. This allows the system to detect anomalies such as malfunctions or tampering by identifying deviations from normal operational patterns, thereby improving reliability while maintaining reasonable system complexity.
Solution Approach 2:
The patent combines multiple electrical characteristic measurements (voltage, current, power factor) to create a composite indicator of switch position and system health. This multi-parameter approach provides more reliable detection of malfunctions and tampering compared to single-parameter methods, while avoiding the complexity of additional hardware sensors.
Data Source
AI summary
Position sensing modules associated with a device are provided. The position sensing modules are configured to receive electrical characteristics associated with one or more switches of a device over a predetermined period of time, the one or more switches being configured to connect service to or disconnect service from a customer; calculate a match indicator for each phase of the device including the one or more switches, the match indicator indicating whether an electrical characteristic on a load-side of the device matches a same electrical characteristic on a line-side of the device for each phase of the device; and determine a position of the one or more switches based on the received electrical characteristics and the calculated match indicator for each phase of the device.