Backfeed Protection Switch Control for De-Energized Utility Grids
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Solution Overview
Problem
The risk of customer backfeeding power into a de-energized commercial power grid poses a significant danger to utility workers, potentially causing life-threatening injuries.
Innovation Solution
A device for backfeed protection that includes terminals for utility and consumer power connections, a power switch controlled by a power controller, and an optional backfeed indicator, which prevents power transfer when the utility power is de-energized and allows transfer when energized, thereby preventing unwanted backfeed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power switch is used to control power transfer between utility and consumer terminals, then backfeed prevention is achieved when utility power is de-energized, but the device complexity increases due to the need for monitoring and control circuitry
Solution Approach 1:
The power controller continuously monitors the utility power terminal and preemptively opens the power switch when de-energization is detected, preventing backfeed before it can occur. This preliminary action ensures worker safety by establishing a protective state in advance of any potential backfeed event.
Solution Approach 2:
The power controller serves as an intermediary between the utility power terminal and the power switch, intelligently managing the switch state based on monitored conditions. This mediator component automates the complex decision-making process, reducing the need for manual intervention while maintaining reliable backfeed prevention.
2Reliability
If continuous monitoring of utility power terminal is implemented, then automatic backfeed prevention is achieved, but the use of energy increases due to ongoing monitoring and control operations
Solution Approach 1:
The power controller employs periodic monitoring of the utility power terminal rather than continuous monitoring, checking for de-energization at regular intervals. This periodic action maintains reliable automatic backfeed prevention while significantly reducing energy consumption compared to continuous monitoring schemes.
3Reliability
If the power switch is designed to automatically open when utility power is de-energized, then worker safety is improved, but the ease of operation decreases due to automatic control mechanisms
Solution Approach 1:
The power controller autonomously monitors utility power status and automatically actuates the power switch without requiring manual operation. This self-service capability ensures worker safety through automatic backfeed prevention while eliminating the need for manual intervention, thereby improving ease of operation in the long term despite the initial complexity of automatic control mechanisms.
Data Source
AI summary
Devices, systems, and methods prevents backfeeding from a downstream residential power source into a commercial power grid when the commercial grid is de-energized. This helps prevent electrocution of line workers who are trying to restore power to the commercial grid such as when a consumer uses a misconfigured generator during a power outage. An indication may be provided when a consumer is attempting to backfeed on a de-energized commercial grid.