Pocket Junction Box Terminal Block for DPGS Meter Collar Interconnection
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Solution Overview
Problem
The installation of distributed power generation systems (DPGS) at customer sites often requires significant time and financial investment for modifying electrical distribution systems and ensuring safe and controlled interconnection with utility power lines, while maintaining safety and power quality standards.
Innovation Solution
A pocket junction box system with a terminal block and integrated barriers, current transformers, and a microprocessor for monitoring power flow, which allows for external termination of field wiring and communication with a meter data management system, ensuring compliance with safety and interconnection requirements while providing environmental sealing and attachment for live parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If meter collars are used to interconnect DPGS production on the line-side of the service disconnecting means, then installation costs and time are reduced, but safe and cost effective configuration of meter collars to accept field wiring is required
Solution Approach 1:
The meter collar is divided into functional segments: a first portion for utility company wiring and a second portion for customer field wiring. This segmentation allows independent configuration of each portion, reducing overall complexity while enabling faster installation by allowing parallel work on separate sections.
Solution Approach 2:
A terminal block serves as an intermediary component between the utility company wiring and field wiring. This intermediate element provides a standardized interface that simplifies the connection process, reducing the need for complex custom configurations while maintaining safety and reliability.
2Reliability
If new dedicated electrical circuits are installed to accommodate DPGS, then safety and power quality standards are met, but significant expenditures of time and money are incurred
Solution Approach 1:
The terminal block and meter collar configuration are designed in advance with pre-defined connection points and pathways for both utility wiring and field wiring. This preliminary preparation eliminates the need for complex on-site calculations and configurations, reducing installation time while ensuring compliance with safety standards.
Solution Approach 2:
The meter collar design accommodates multiple functions: it serves as a mounting structure for the watt-hour meter, provides a terminal block for electrical connections, and offers a protective enclosure. This multi-functionality reduces the need for additional separate components, thereby reducing installation time and cost while maintaining reliability.
3Reliability
If DPGS is isolated from utility power lines, then damage to utility distribution system is prevented, but interconnection capabilities are limited
Solution Approach 1:
The meter collar configuration enables dynamic switching between isolated operation and interconnected operation. The terminal block design allows for easy disconnection or connection of field wiring, providing adaptability for different operational modes while maintaining utility system protection through proper isolation when required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates safe, cost-effective, and efficient integration of DPGS into residential or business structures, maintaining power quality and enabling automatic disconnect capabilities, thus reducing installation costs and ensuring safety and compliance with standards.
Implementation Method 1
The pocket junction box may further include at least one current transducer and at least one microprocessor for monitoring the power flow through the pocket junction box
Data Source
AI summary
Technologies are generally described for a pocket junction box system. In an example, a pocket junction box is configured to fit inside a meter collar. The pocket junction box includes a first set of electrical terminals on a rear surface of the pocket junction box for interfacing with wire leads inside the meter collar, and a second set of electrical terminals on a front surface of the pocket junction box for interfacing with field wire leads outside the meter collar. The pocket junction box may further include at least one current transducer and at least one microprocessor for monitoring the power flow through the pocket junction box. A front casing is attached to the front surface of the pocket junction box and connected to the second set of electrical terminals. The front casing may include a communications circuit board for communicating with a meter data management system.