Intelligent Electronic Device Gain Control for Metering Accuracy
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Solution Overview
Problem
Intelligent electronic devices (IEDs) used in electrical utility services, such as digital electric power and energy meters, face challenges in maintaining operability and accuracy when exposed to varying supply voltages and currents, leading to a need for improved regulation and measurement techniques.
Innovation Solution
A digital electrical power and energy meter with a gain control unit that dynamically adjusts the operating ranges of output signals to match pre-determined ranges for input signals, using a sensing circuit with voltage and current sensors, and a data acquisition system, allowing for precise measurement and processing of supply voltages and currents across different electrical services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single model of IED is used across different electrical networks and customer groups, then device simplicity and ease of manufacture are improved, but measurement accuracy and operability deteriorate when exposed to multiple ranges of supply voltages and currents
Solution Approach 1:
The patent implements dynamic gain control that automatically adjusts the operating ranges of output signals from sensing circuits based on the detected supply voltage and current levels. This allows a single IED model to adapt its measurement parameters in real-time, maintaining high accuracy across multiple electrical service conditions without requiring multiple specialized device models.
Solution Approach 2:
The system changes operational parameters (gain factors, operating ranges) based on the detected electrical service conditions. The gain control unit selectively adjusts these parameters to match pre-determined ranges for the data acquisition system, enabling the same hardware to accurately measure across different voltage and current ranges by dynamically modifying its signal processing characteristics.
2Device complexity
If a single model of IED is used across different electrical networks and customer groups, then device complexity is reduced, but operability under varying supply conditions deteriorates
Solution Approach 1:
The IED incorporates dynamic adaptation mechanisms that automatically adjust its operating parameters based on the detected electrical service conditions. The gain control unit and processing module work together to modify signal processing characteristics in real-time, ensuring reliable operation across multiple voltage and current ranges without requiring multiple specialized device models or complex manual configuration.
3Measurement precision
If dynamic adjustment of operating ranges is implemented, then measurement accuracy across different electrical services is improved, but device complexity increases
Solution Approach 1:
The gain control unit operates autonomously, automatically detecting the electrical service conditions and adjusting its own gain factors and operating ranges without external intervention. The processing module independently determines the appropriate gain settings based on the detected supply voltage and current levels, eliminating the need for complex manual configuration or external control systems while maintaining high measurement accuracy.
Data Source
AI summary
An intelligent electronic device (IED) having a gain control unit adapted to selectively regulate operating ranges of output signals of a sensing circuit of the device is described. In one embodiment, the IED is a digital electric power and energy meter, which operating ranges for supply voltages and supply currents of electrical services may be adjusted to match pre-determined ranges for input signals of a data acquisition system or a data processing module of the meter.