Non-Contact AC Probe for Multi-Wire Current Measurement
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Solution Overview
Problem
Existing non-contact alternating current measuring instruments cannot directly measure currents in cables with multiple wires without damaging the insulation layer, as the magnetic fields from multiple wires counteract each other, resulting in inaccurate readings.
Innovation Solution
A non-contact alternating current sensing probe with a sealed shielding space and an induction coil that allows electromagnetic signals from individual wires in a multi-wire cable to be detected without physical contact, using a detection port to direct signals into the shielding space for accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional clamp meters clamp two wires (such as a live wire and a zero wire) at the same time, then the measurement is performed non-contact, but the magnetic fields generated by the two wires are counteracted in opposite directions, resulting in a resultant magnetic field of zero and a reading number of zero
Solution Approach 1:
The probe body is divided into multiple independent detection ports, each capable of detecting electromagnetic signals from individual wires. This segmentation allows the probe to measure each wire's current separately rather than measuring the combined magnetic field, thereby resolving the cancellation issue when multiple wires are present.
Solution Approach 2:
Each detection port is designed with specific directional sensitivity to detect electromagnetic signals from specific wires. The probe can selectively orient detection ports toward different wires in a cable, enabling targeted measurement of individual wire currents while ignoring other wires, thus maintaining measurement accuracy in multi-wire configurations.
2Measurement precision
If conventional probes use thick silicon steel sheets in a closed loop or semi-open mode, then alternating current measurement on single wires is achieved, but alternating current measurement on cables with two or more wires cannot be directly performed
Solution Approach 1:
The probe is designed with multiple detection ports that can independently detect electromagnetic signals from different wires. This multi-functional design enables the same probe to measure both single wires and multi-wire cables effectively, eliminating the need for different measurement approaches and allowing direct measurement on various cable types without peeling insulation.
3Measurement precision
If peeling off an insulation protective layer of the cable is performed to measure each wire separately, then accurate current measurement is achieved, but the operation becomes cumbersome and inefficient, and the insulation protective layer is damaged
Solution Approach 1:
The probe replaces mechanical contact-based measurement methods with electromagnetic field-based detection. By detecting electromagnetic signals radiated by current-carrying wires through multiple directional detection ports, the system achieves accurate individual wire measurement without mechanical contact or insulation damage, thereby simplifying the measurement process significantly.
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 direct and accurate measurement of alternating current in single wires or cables with multiple wires without damaging the insulation, providing reliable electrical parameter readings such as current, voltage, frequency, and harmonics.
Implementation Method 1
an induction coil that can collect the electromagnetic signal passing through the detection port to enter the shielding space
Implementation Method 2
constructing a sealed shielding space for preventing electromagnetic interference
Data Source
AI summary
The present invention discloses a non-contact alternating current sensing probe and a sensing method and application thereof. Alternating current measurement can be directly performed on a single wire or a cable composed of two or more wires. During detection, the detection port is adjusted to a better measurement position of a target wire through position adjustment, so that an electromagnetic signal generated by the target wire passes through the detection port and enters the shielding space to be collected by the induction coil, sensing of alternating current-related electrical parameters, including a current, a voltage, a frequency, a duty cycle, a phase, a harmonic, a frequency-conversion signal, etc. is realized, and the probe can work for a long time, cannot lead to the problem of inaccuracy caused by heat, can be applied to measuring instruments such as a test pen, a multimeter and a clamp meter, and has large application prospects.