Rogowski Coil Holding Device Thermal Protection
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Solution Overview
Problem
Rogowski coils used for measuring alternating current can be damaged by high temperatures and may slip or change position relative to current-conducting means like busbars, affecting measurement accuracy.
Innovation Solution
A holding device with a Rogowski coil that includes a fastening part attached to a current-conducting device and a housing part connected to the coil, allowing for contact-free fastening and adjustable positioning to prevent direct contact and maintain accurate placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Rogowski coil is laid directly around the busbar, then the measurement function is achieved, but the coil may touch the hot busbar causing damage to the plastics casing
Solution Approach 1:
The holding device is divided into two separate parts: a fastening part that attaches to the busbar and a housing part that contains the Rogowski coil. This segmentation allows the fastening part to be made of heat-resistant material while the housing part with the coil can be made of plastics, protecting the coil from thermal damage without requiring the entire device to be heat-resistant.
Solution Approach 2:
The fastening part acts as an intermediary between the hot busbar and the Rogowski coil housing. It provides a mechanical connection to the busbar while maintaining a thermal barrier, allowing the coil housing to be made of plastics material that would otherwise be damaged by direct contact with the hot conductor.
2Measurement precision
If the Rogowski coil is laid around the busbar, then current measurement is enabled, but the coil may slip or change position affecting measurement accuracy
Solution Approach 1:
The fastening part is designed to be attached to the busbar first, establishing a stable reference position before the housing part with the Rogowski coil is connected. This preliminary action ensures that the coil is positioned correctly and securely before the measurement process begins, preventing slippage during operation.
Solution Approach 2:
The manual positioning and securing method is replaced by a mechanical fastening system with attachment elements that automatically secure the housing part to the fastening part. This mechanical substitution ensures consistent, repeatable positioning without requiring manual adjustment during operation.
3Ease of manufacture
If the Rogowski coil housing is made of plastics material, then ease of manufacture and cost are improved, but the housing cannot withstand high temperatures of the busbar
Solution Approach 1:
The device is segmented into a fastening part that contacts the hot busbar (made of heat-resistant material) and a housing part that contains the coil (made of inexpensive plastics). This allows each part to be optimized for its specific function: the fastening part for thermal resistance and the housing part for ease of manufacture and cost-effectiveness.
Solution Approach 2:
Different parts of the holding device have different material properties tailored to their specific requirements. The fastening part has high thermal resistance to withstand busbar temperatures, while the housing part uses plastics material for ease of manufacture and cost reduction. Each local region of the device has the quality needed for its function.
Data Source
AI summary
A holding device includes a Rogowski coil, where the Rogowski coil includes a line portion wound into a coil. The holding device further includes a housing part into which the Rogowski coil is connected. A fastening part is configured to be releasebly connected to the housing part and is further configured to be attached to a current-conducting means formed for conducting a current.