Sensor Connecting Conductor Tuned for High-Frequency Interference
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Solution Overview
Problem
Existing connecting conductors used to transmit measurement signals between sensors and intelligent electronic units (IEDs) in electrical power supply networks are susceptible to external electromagnetic transient interference, which can distort measurement results.
Innovation Solution
The connecting conductor is adapted to the frequency range of the interfering electromagnetic fields by incorporating terminating resistors and additional capacitance, forming a capacitive voltage divider, to render it insensitive to high-frequency interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard connecting conductors are used to transmit measurement signals, then the device complexity remains low and ease of manufacture is maintained, but the measurement precision deteriorates due to susceptibility to electromagnetic interference
Solution Approach 1:
The patent introduces an intermediary shielding structure consisting of conductive shielding elements arranged around the connecting conductor. These shielding elements act as a mediator between the measurement signal and the external electromagnetic environment, diverting interference away from the signal path while allowing the simple connecting conductor structure to remain intact
Solution Approach 2:
The patent modifies the electrical parameters of the connecting conductor system by adding conductive shielding elements with specific impedance characteristics. This changes the frequency response and electromagnetic compatibility of the conductor without fundamentally altering its basic structure, enabling it to reject high-frequency interference while maintaining signal transmission capability
2Reliability
If the connecting conductor is adapted to high-frequency interference ranges by adding shielding structures, then the reliability improves against electromagnetic interference, but the ease of manufacture deteriorates
Solution Approach 1:
The shielding structure is segmented into discrete conductive elements arranged along the connecting conductor rather than forming a continuous complex structure. This segmentation allows each element to be independently positioned and connected, significantly simplifying the manufacturing process while maintaining effective electromagnetic shielding across the interference frequency range
Solution Approach 2:
The patent employs simple conductive shielding elements that can be manufactured as inexpensive components and easily attached to the connecting conductor. These elements provide effective interference protection without requiring complex or expensive materials, making the overall system cost-effective and easy to manufacture
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 adaptation effectively shields the measurement signals from high-frequency interference, ensuring accurate recording of measured values even during transient interference events.
Implementation Method 1
events occurring in the vicinity of the connecting conductor, such as the switching of a circuit breaker, can generate electromagnetic interference that can affect the measurement accuracy of the sensor head
Implementation Method 2
a capacitance is formed at the sensor end between the conductor phases
Data Source
Figure 1~2
Figure 3
AI summary
In order to create a connecting conductor (2) for the electrical connection of a sensor (6) providing measurement signals on the output side to an intelligent electronic unit (IED) (13) which is designed to process the measurement signals, with - at least two electrically conductive and mutually insulated conductor phases (4a, 4b), - a sensor end (9) at which a conductor input (10) is formed for electrical connection to an output of the sensor (6), and - an evaluation unit end (11) which has a conductor output (12) for electrical connection to an input of the evaluation unit (13), - wherein both conductor phases (4a, 4b) extend from the conductor input (10) to the conductor output (12) and are designed to transmit the measurement signals between the output of the sensor and the input of the evaluation unit, in which measurement errors due to high-frequency interference are avoided, it is proposedthat the connecting conductor (1) is adapted to a frequency range in which the interference occurs.,