Fork-Shaped Current Sensor With Interference Compensation
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Solution Overview
Problem
Existing contactless electric current measurement methods using current clamps require opening and closing of a ring-shaped core for each measurement, which is cumbersome, especially for multiple or hard-to-access conductors, and struggle with external magnetic interference.
Innovation Solution
A measuring arrangement with a fork-shaped, rigid design featuring multiple measuring coils and compensating coils, where each measuring coil has two compensating coils arranged at specific angles to detect signals independently, allowing for improved interference suppression and plausibility checks, enabling accurate measurements without opening the core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a ring-shaped core is used for contactless current measurement, then measurement accuracy is improved by eliminating external magnetic interference, but the device complexity and ease of operation deteriorate due to the need to open and close the core for each measurement
Solution Approach 1:
The ring-shaped core is segmented into two separate fork-shaped measuring coils that can be positioned on opposite sides of the conductor. This segmentation eliminates the need to open and close a single core, as the two forks can be independently positioned to enclose the conductor, thereby improving ease of operation while maintaining measurement accuracy through the combined magnetic field detection.
Solution Approach 2:
The invention transitions from a single-plane ring core to a three-dimensional arrangement where two fork-shaped measuring coils are positioned on opposite sides of the conductor. This dimensional change allows the measuring system to enclose the conductor without requiring mechanical opening and closing, resolving the contradiction between measurement precision and operational simplicity.
2Measurement precision
If a ring-shaped core is used for contactless current measurement, then measurement accuracy is improved by eliminating external magnetic interference, but ease of operation deteriorates due to the need to open and close the core for each measurement
Solution Approach 1:
The ring-shaped core is segmented into two separate fork-shaped measuring coils that can be positioned on opposite sides of the conductor. This segmentation eliminates the need to open and close a single core, as the two forks can be independently positioned to enclose the conductor, thereby improving ease of operation while maintaining measurement accuracy through the combined magnetic field detection.
Solution Approach 2:
The invention transitions from a single-plane ring core to a three-dimensional arrangement where two fork-shaped measuring coils are positioned on opposite sides of the conductor. This dimensional change allows the measuring system to enclose the conductor without requiring mechanical opening and closing, resolving the contradiction between measurement precision and operational simplicity.
3Measurement precision
If compensating coils are added to suppress external interference fields, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The compensating coils are integrated into the same fork-shaped structure as the measuring coils, sharing the same physical support and spatial arrangement. This merging approach allows interference suppression functionality to be added without proportionally increasing device complexity, as the compensating coils utilize the existing structural framework and positioning mechanisms of the measuring system.
Solution Approach 2:
The fork-shaped structure serves multiple functions: it supports both the measuring coils for detecting the conductor's magnetic field and the compensating coils for suppressing external interference. This multi-functionality reduces the need for separate structural elements, thereby improving measurement precision while limiting the increase in device complexity.
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 arrangement enhances measurement accuracy and usability by eliminating the need to open and close the core and effectively compensating for external interference, allowing for precise and efficient contactless current measurement.
Implementation Method 1
a signal is generated in a measuring coil arrangement by induction from the electric conductor
Implementation Method 2
the, or each, measuring coil has electrically assigned thereto at least one compensating coil of the compensating coil arrangement
Data Source
AI summary
In a measuring arrangement (1) for contactless electric current measurement, it is provided to detect a common signal of a measuring coil arrangement (2) and a compensating coil arrangement (3) by a first detection device (4) and to detect a signal from at least one measuring coil (6, 7) of the measuring coil arrangement (2) separately therefrom by a second detection device (5, 23).