Proving Unit for Non-Contact Voltage Measurement Verification
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Solution Overview
Problem
Conventional voltmeters and multimeters require galvanic contact for measuring AC voltage, posing safety risks and not providing actual magnitude measurements, while non-contact voltage detectors only indicate the presence of AC voltage without measuring its magnitude.
Innovation Solution
A method and device that use a DC-to-AC converter to generate a specified AC voltage on an insulated wire, allowing non-contact measurement systems to measure voltage without galvanic contact, using capacitively coupled body capacitance or a second conductor for coupling, and include a user-selectable voltage level and indicators for operational verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If galvanic contact measurement is used, then voltage magnitude can be measured accurately, but safety risks increase and insulation must be compromised
Solution Approach 1:
The patent introduces an insulated wire as an intermediary carrier that transports the test voltage from the proving unit to the measurement system without requiring direct galvanic contact between the user and the voltage source. The wire acts as a safe mediator that isolates the user from electrical hazards while still enabling accurate voltage measurement through non-contact detection methods.
2Object-affected harmful factors
If non-contact voltage detection is used, then safety is improved, but only presence/absence indication is provided without magnitude measurement
Solution Approach 1:
The proving unit is designed to perform multiple functions: it generates known test voltages, transmits them through insulated wires, and enables both non-contact detection (for safety) and magnitude measurement (for verification). The system universally supports different measurement modes and voltage levels, making it adaptable to various testing scenarios while maintaining safety and providing complete information.
3Object-affected harmful factors
If insulated wire is used for voltage transmission, then safety is improved and non-contact measurement is enabled, but coupling the voltage source becomes more complex
Solution Approach 1:
The system utilizes the user's body capacitance as a natural coupling mechanism, eliminating the need for complex external coupling devices. The human body inherently provides the necessary capacitive coupling to sense the voltage on the insulated wire without direct contact, simplifying the overall system while maintaining safety. This self-service approach leverages existing physical properties rather than requiring additional complex components.
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
Enables safe and accurate measurement of AC voltage magnitude in insulated wires without physical contact, providing a verified voltage source for testing non-contact voltage measurement systems, even in situations with no known voltage sources, and supports both non-contact and contact voltage measurement systems.
Implementation Method 1
converting, via the DC-to-AC converter, the voltage of the received DC power to a specified AC voltage at an output of the DC-to-AC converter
Implementation Method 2
Coupling the specified AC voltage output with a non-contact AC voltage measurement system may include capacitively coupling the specified AC voltage output with a non-contact AC voltage measurement system via a body capacitance of a user
Implementation Method 3
energizing an insulated wire with the specified AC voltage output by the DC-to-AC converter, wherein the insulated wire comprises a first conductor surrounded by an insulation layer
Data Source
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AI summary
Systems and methods provide a portable, verified voltage source that allows safe testing of separate non-contact voltage measurement systems. A proving unit of the present disclosure provides a known or specified alternating current (AC) voltage output across an insulated wire, which AC voltage may be fixed or may be user-selectable through a suitable user interface. The proving unit may include a visual indicator and/or an audible indicator that provides the user with an indication confirming that the proving unit is supplying an output voltage with the specifications of the proving unit, so the user will know that the proving unit is operating normally and is ready for testing a non-contact voltage measurement system. If the proving unit cannot provide the specified voltage output, the indicator(s) provides a signal to the user that the proving unit is currently non-functional. The proving unit may additionally verify contact voltage measurement systems (e.g., DMMs).