Load-Side Voltage Sensing for Safe Remote Power Reconnection
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Solution Overview
Problem
The remote reconnection of electrical power to a consumer's building without detecting load-side voltages can lead to damage to devices, circuits, and the electrical power meter, as well as potential electrical fires.
Innovation Solution
A load-side voltage detection module is integrated into a metrology device, which includes a voltage divider, resistors, and a pulse generator to detect voltages on the load-side terminals and prevent the closure of the disconnect switch if a load-side voltage is present above a certain threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If remote reconnection of electrical power is performed without load-side voltage detection, then productivity and ease of operation are improved, but device reliability and safety deteriorate due to potential equipment damage and electrical fires
Solution Approach 1:
The system performs load-side voltage detection before allowing disconnect switch closure. The microcontroller checks for load-side voltages through voltage dividers and comparators, and only permits switch closure when no dangerous voltages are detected, preventing equipment damage while enabling remote operation
Solution Approach 2:
The system continuously monitors load-side voltages and provides feedback to the microcontroller. Based on this feedback, the microcontroller controls the disconnect switch state, enabling remote reconnection only when safe conditions are confirmed through real-time voltage monitoring
2Reliability
If load-side voltage detection is implemented, then device reliability and safety are improved, but device complexity increases due to additional detection module components
Solution Approach 1:
The voltage detection module is integrated within the existing metering device housing. The microcontroller, voltage dividers, and control circuitry are combined into a single unified device, reducing overall system complexity while maintaining comprehensive safety monitoring capabilities
Solution Approach 2:
The microcontroller serves multiple functions: it controls the disconnect switch, processes load-side voltage detection signals, monitors line-side voltages, and manages communication protocols. This multi-functionality reduces the need for separate dedicated components, simplifying the overall device structure
3Measurement precision
If technician physical inspection is required for power restoration, then measurement precision and safety are improved, but loss of time and productivity deteriorate
Solution Approach 1:
The system replaces the mechanical/physical inspection process with electronic voltage detection. The microcontroller electronically monitors load-side voltages through voltage dividers and comparators, providing precise detection without requiring technician presence, thus reducing restoration time while maintaining detection accuracy
Solution Approach 2:
The system performs self-monitoring of load-side voltages and automatically determines when safe reconnection conditions exist. The microcontroller autonomously controls the disconnect switch based on detected voltage levels, eliminating the need for continuous technician monitoring and enabling faster autonomous power restoration
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 load-side voltage detection module ensures safe operation by preventing damage to equipment and reducing the risk of electrical incidents, allowing for remote disconnection and reconnection of electrical power while maintaining safety protocols.
Implementation Method 1
a voltage divider electrically coupled between a first line-side terminal and a second line-side terminal, the voltage divider creating a reference voltage
Implementation Method 2
a pulse generator to generate a pulse based on detection of voltage, the pulse indicating a voltage on the first load-side terminal or the second load-side terminal above at least one 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.