Meter Socket Adapter Layout for Sealed BESS Grid Connection
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Solution Overview
Problem
Retrofitting a meter combo load center for connecting a microgrid to a utility grid is costly and labor-intensive, often requiring extensive rewiring and installation of expensive, less accurate Rogowski coils for current measurement, due to the sealed nature of the meter combo load center, which lacks space for additional connections and transformers.
Innovation Solution
A meter socket adapter (MSA) and meter interconnection device (MID) system that allows connection of a battery energy storage system (BESS) to a household microgrid without unsealing the meter combo load center, using CTs for current measurement and an energy management system (EMS) to control electrical connections, enabling efficient and cost-effective integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the meter combo load center is sealed for security reasons, then security is improved, but access for connecting the MID is blocked
Solution Approach 1:
The patent implements a nested structure where the meter socket adapter is inserted into the meter combo load center, and the MID is subsequently inserted into the adapter. This nested arrangement allows the MID to access the sealed load center through the adapter without compromising security, as the adapter itself remains secured within the load center while providing an interface for the MID.
Solution Approach 2:
The meter socket adapter serves as an intermediary device between the sealed meter combo load center and the MID. It provides a standardized interface that mediates the connection, allowing the MID to connect to the load center without requiring direct access to the sealed interior, thus maintaining security while enabling functionality.
2Volume of moving object
If the meter combo load center lacks space for additional connections, then compactness is improved, but retrofitting for MID connection becomes costly and labor-intensive
Solution Approach 1:
The patent segments the connection system into separate functional components: the meter socket adapter provides the physical interface and connection points, while the MID provides the control and monitoring functions. This segmentation allows the adapter to be installed in the existing load center without requiring internal modifications, avoiding costly retrofitting while maintaining compact space utilization.
Solution Approach 2:
The meter socket adapter is designed as a universal interface that can be installed in existing meter combo load centers without modification. It provides multiple functions including mechanical support, electrical connections, and standardized interfacing, eliminating the need for custom retrofitting work and reducing both cost and labor requirements.
3Difficulty of detecting and measuring
If Rogowski coils are used for current measurement in the sealed load center, then measurement capability is achieved, but accuracy deteriorates and installation becomes complex
Solution Approach 1:
The meter socket adapter acts as an intermediary that provides dedicated current measurement points through standardized terminals. Instead of using Rogowski coils that require placement within the sealed load center, the adapter offers external measurement interfaces that maintain electrical isolation while providing accurate current data to the MID, thereby improving both accuracy and installation simplicity.
Data Source
AI summary
A meter socket adapter (MSA) for connecting a battery energy storage system (BESS) to a household microgrid through a meter combo load center. The MSA includes: a housing matching an electricity meter and a meter socket in the meter combo load center; a plurality of power conductors that connect among the electricity meter, the meter socket, and BESS; a meter interconnection device (MID) switch for connecting a utility grid or one or more distribution energy resource (DER) devices to supply power to household loads in the household microgrid; a MID driving circuit for driving the MID switch to close or open; and a MID connection detection circuit to verify an electrical connection of a closed MID switch.