Smart Meter Automatic Disconnect Switch Grid Safety
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Solution Overview
Problem
The integration of customer-site electrical generators and storage devices for backup power during outages poses safety risks by potentially energizing utility distribution grids, and existing systems lack efficient methods to automatically disconnect and reconnect loads based on voltage, frequency, or current issues, affecting grid integrity and customer safety.
Innovation Solution
An electricity meter with a service disconnect switch, sensors, and a communications module that automatically disconnects or reconnects loads based on preprogrammed thresholds for current, voltage, power, and frequency, synchronized with a utility's data center, enabling safe use of customer-site generation or storage during outages and maintaining grid reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If customer-site generators or storage devices are used for backup power during outages, then power availability for customers is improved, but unsafe power feeds back to the utility distribution grid occur
Solution Approach 1:
The system segments the power distribution network into utility-controlled sections and customer-controlled sections using automated disconnect switches at multiple points (meter level, transformer level, and customer premises). This segmentation allows customer-site generators to operate independently during outages while preventing unauthorized power feeds back to the utility grid by isolating the customer side from the utility distribution lines.
Solution Approach 2:
The system implements real-time feedback mechanisms where sensors continuously monitor grid status, disconnect switch positions, and generator operation. This feedback enables the automated control system to detect when a customer-site generator is running and automatically open disconnect switches to prevent back-feeding, while still allowing the generator to supply power to customer loads during verified outage conditions.
2Reliability
If automated disconnection systems are implemented to prevent unsafe feeds, then grid safety is improved, but system complexity increases
Solution Approach 1:
The automated disconnect switch is designed as a multi-functional device that combines utility-controlled disconnection capability, customer-controlled disconnection capability, generator interconnection switching, and protective relay functions. By integrating these multiple functions into a single device, the system achieves comprehensive grid safety without proportionally increasing overall system complexity.
Solution Approach 2:
The system implements self-service automation where the disconnect switches and control systems automatically detect grid outage conditions, coordinate with customer-site generators, and execute disconnection/reconnection operations without requiring manual utility intervention. This automated self-service capability maintains grid safety while reducing the operational complexity of manual control procedures.
3Ease of operation
If remote disconnection is performed manually or via automated software, then power control capability is improved, but response time to voltage or frequency problems increases
Solution Approach 1:
The system pre-configures automated disconnect switches with pre-programmed response criteria for various grid conditions (voltage thresholds, frequency thresholds, outage detection parameters). When grid problems occur, the switches automatically execute pre-planned disconnection actions based on these pre-configured parameters, eliminating the delay associated with manual assessment and decision-making while maintaining precise control capability.
Solution Approach 2:
The system replaces manual mechanical switch operations and human-mediated software control with automated electronic sensing and actuation systems. Sensors continuously monitor grid parameters and directly trigger disconnect switch operations through electronic control circuits, replacing the slower manual or software-mediated control processes and achieving rapid response to voltage or frequency problems.
Data Source
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AI summary
An electrical power distribution system having an electricity meter connected to power lines on one side and a load on the other side, the electricity meter enabling automatic disconnection and/or reconnection as determined by one or more thresholds stored in memory of the electricity meter. Electricity meters having an automatic disconnect feature are disclosed as are methods of connecting the electrical power distribution system. Other aspects are disclosed.