Voltage Detector with Non-Contact Sensors for AC Measurement
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Solution Overview
Problem
Existing high voltage detectors for AC circuits lack accuracy due to the influence of the size and shape of the voltage conductor and nearby conductors or grounds, which are not adequately accounted for in prior designs.
Innovation Solution
The integration of multiple non-contact input/output sensors on the voltage detector housing to evaluate the physical shape and size of the voltage source and detect nearby electric fields, allowing for correction of the voltage measurement using a microprocessor to offset the distorting effects of the conductor size and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage detector uses a direct contact probe to measure AC voltage, then the measurement can be performed without a ground lead (improving safety), but the measurement accuracy is poor (ranging from 10% below to 50% above true voltage) due to the influence of conductor size and shape
Solution Approach 1:
The voltage detection function is segmented into multiple independent sensors: a primary contact probe for direct voltage measurement and multiple secondary non-contact sensors for detecting electric fields from adjacent conductors. This segmentation allows the system to separately measure the voltage of interest and the distorting effects of nearby conductors, enabling accurate compensation while maintaining safety.
Solution Approach 2:
Non-contact sensors act as intermediaries to detect the electric fields generated by adjacent phase conductors and ground conductors. These sensors do not directly contact the high voltage conductors but instead measure the electric field effects, providing information about the distorting influences without creating safety hazards.
2Ease of operation
If the voltage detector is designed to be simple and easy to operate, then the device complexity is reduced, but it cannot accurately account for the size and shape of the voltage conductor and nearby conductors
Solution Approach 1:
The voltage detector automatically performs compensation calculations using its own internal sensors and microprocessor. The system self-calibrates by measuring the electric fields from adjacent conductors and automatically adjusts the voltage reading, eliminating the need for manual intervention or complex external calibration procedures while achieving high accuracy.
Solution Approach 2:
The system dynamically adjusts measurement parameters based on real-time detection of electric field conditions. The microprocessor modifies the voltage calculation by introducing compensation factors that change according to the detected presence and position of adjacent conductors, allowing accurate measurement across various conductor configurations without manual reconfiguration.
3Measurement precision
If multiple non-contact sensors are added to detect electric fields from adjacent conductors, then voltage measurement accuracy is significantly improved, but the device complexity increases
Solution Approach 1:
The non-contact sensors serve multiple functions: they detect electric fields from adjacent phase conductors, detect electric fields from ground conductors, and provide data for automatic compensation calculations. This multi-functionality justifies the added complexity by extracting multiple types of information from a single sensor system, reducing the need for separate dedicated sensors for each function.
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
This approach significantly improves the accuracy of high voltage measurements by accounting for the size and shape of the voltage source and nearby conductors, reducing measurement errors and providing more precise readings.
Implementation Method 1
detect nearby electric fields of adjacent phase conductors or ground conductor
Data Source
AI summary
A voltage detector that more accurately measures AC voltage of a voltage conductor by correcting the voltage detected directly by the detector's contact probe to account for the conductor's size and shape. The housing of the detector has plural non-contact electrode sensors spaced apart over its surface for sensing capacitive charging currents in the detector's vicinity. By combining voltages sensed by these electrode sensors to the probe's measured voltage, the detector can correct the contact probe measurement for voltages that bypass the contact probe or other conductors in the vicinity that product their own capacitive charging currents. A microprocessor in the housing of the present detector adds or subtracts sensed voltages depending on whether they are input or output voltages, respectively.