Load-Side Voltage Sensing to Block Hazardous Meter Reconnection
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Solution Overview
Problem
Utility companies face challenges in safely reconnecting electrical power to consumers without risking damage to alternative power sources or electrical components, as existing methods lack effective load-side voltage detection, leading to potential electrical hazards and equipment damage.
Innovation Solution
A load-side voltage detection module is integrated into utility meters, utilizing a combination of resistors, voltage dividers, and pulse generators to detect voltages on load-side terminals, preventing the closure of disconnect switches when hazardous voltages are present, thereby ensuring safe reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If remote reconnection of electrical power is performed without load-side voltage detection, then productivity is improved through automated remote operation, but reliability deteriorates due to risk of equipment damage from alternative power sources
Solution Approach 1:
The system performs load-side voltage detection before closing the disconnect switch during remote reconnection. The voltage detection module checks for alternative power sources (generators, photovoltaic systems) on the load side before utility power is restored, preventing catastrophic damage to equipment. This preliminary safety check enables automated remote reconnection without requiring technician site visits.
2Reliability
If technician site visits are required to detect alternative power sources, then reliability is improved through physical inspection, but productivity deteriorates due to manual intervention requirements
Solution Approach 1:
The patent replaces the mechanical/physical inspection method with an electrical detection system. The load-side voltage detection module uses electrical circuits to automatically detect alternative power sources by measuring voltage presence on the load side, substituting the technician's physical inspection with automated electrical sensing. This enables remote reconnection operations without requiring technician site visits.
3Reliability
If load-side voltage detection is implemented, then reliability is improved by preventing equipment damage, but device complexity increases due to additional detection circuitry
Solution Approach 1:
The voltage detection module serves multiple functions: it detects alternative power sources, validates safe reconnection conditions, and provides system protection. By integrating this detection capability into the existing meter architecture, the system achieves reliable equipment protection while minimizing the increase in overall device complexity through multi-functional design.
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
The solution enables safe remote disconnection and reconnection of utility services while preventing damage to alternative power sources and electrical components, reducing the risk of electrical hazards and ensuring compliance with safety standards like NEMA C12.30.
Implementation Method 1
a voltage divider creating a reference voltage for the load-side voltage detection module
Implementation Method 2
a pulse generator to generate a pulse indicative of a voltage on the load-side terminals above a threshold
Data Source
AI summary
A load-side voltage detection module for a metrology device includes a plurality of first resistors electrically coupled to a first load-side terminal, the first resistors being in series, a plurality of second resistors electrically coupled to a second load-side terminal, the second resistors being in series, a voltage divider electrically coupled between a first line-side terminal and a second line-side terminal, the voltage divider creating a reference voltage for the load-side voltage detection module, and a pulse generator to generate a pulse based on detection of voltage, the pulse indicating a voltage on at least one of the first load-side terminal or the second load-side terminal, above at least one threshold.