Modular Metering Device Field Rephasing via Line Straps
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Solution Overview
Problem
Existing modular metering devices lack the ability to efficiently and effectively rephase individual meter sockets in the field, leading to inefficiencies in balancing tenant loads across three phases, which complicates the distribution of electrical power and can result in overheating and overload issues.
Innovation Solution
The modular metering device allows for individual meter sockets to be rephased between A-B, B-C, or A-C phase combinations by moving line straps attached to the meter sockets, enabling selective connection to different phases and maximizing electrical contact between the sockets and phase buses, thus allowing for balanced load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If field rephasing of individual meter sockets is not enabled, then the device structure remains simple and fixed, but load balancing across three phases becomes inefficient and complex
Solution Approach 1:
The metering device is divided into independent modular meter sockets, each capable of being rephased individually. This segmentation allows flexible reconfiguration of phase connections without affecting other meters, enabling efficient load balancing while maintaining overall system simplicity through standardized modular units.
Solution Approach 2:
The meter sockets are designed with dynamic rephasing capability, allowing the phase connections to be changed from a fixed configuration to an adjustable one. This enables the system to adapt to varying load conditions by reconfiguring which phases are connected to each meter socket, improving load distribution without permanent structural changes.
2Reliability
If pre-phased meter stacks are used to balance loads, then load balancing can be achieved, but the ordering and installation process becomes complex and time-consuming
Solution Approach 1:
The meter sockets are pre-configured with all necessary connection terminals and components for all three phase combinations (AB, BC, AC) during manufacturing. This preliminary preparation eliminates the need for complex field calculations and custom ordering of different pre-phased units, as all sockets can be configured for any phase combination using the same standardized hardware.
Solution Approach 2:
A universal meter socket design is employed that can serve multiple phase combinations (AB, BC, AC) through simple reconfiguration of line straps. This multi-functionality eliminates the need to order different types of pre-phased meter stacks for different phase requirements, streamlining the ordering process and reducing installation time.
3Ease of operation
If line straps are made easily movable for rephasing, then field rephasing becomes simple, but electrical contact reliability may be compromised
Solution Approach 1:
The line straps serve as an intermediary component between the fixed bus bars and the meter sockets. They provide a flexible connection that can be easily moved and reconfigured for different phase combinations while maintaining reliable electrical contact through their conductive material and contact surface design, thus mediating between ease of operation and contact reliability.
Data Source
AI summary
A field rephaseable metering device is provided including at least three distribution buses including two side buses and a center bus, the center bus having a vertical center line. At least one meter socket is provided having a vertical center line offset from the vertical center line of said center bus, each meter socket including a first line terminal and a second line terminal. At least two line straps are provided, each having a first end configured for connecting with one of the first or second line terminals, and a second elongate end configured to be selectively connectable to one of the side buses associated with its line terminal or the center bus. When each line strap is positioned to connect one of the line terminals with one of the distribution buses, a longitudinal axis of each line strap is substantially perpendicular to a longitudinal axis of each distribution bus.