Verification Device for Electrical Overvoltage Detection
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Solution Overview
Problem
Insulation damage in electrical conductors due to overvoltages, particularly in rotating electrical machines, is difficult to predict and detect externally, leading to potential machine failure without visible signs of insulation degradation.
Innovation Solution
A verification device with conductor tracks made of insulating material and a measuring device that detects changes in electrical resistance caused by partial discharges triggered by overvoltages, allowing for the detection of overvoltages without shutting down the machine, using composite materials with conductive fillers that increase resistance upon partial discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation monitoring methods are used, then the insulation quality cannot be quantified from the exterior, but it is impossible to predict total failure due to insulation damage
Solution Approach 1:
The patent introduces conductor tracks as an intermediary element that mediates between the high-voltage electrical conductors and the low-voltage measuring device. The conductor tracks are positioned to be affected by partial discharges from overvoltages without being directly connected to high voltage, allowing indirect measurement of insulation conditions while protecting the measurement system.
Solution Approach 2:
The patent replaces direct electrical connection methods with a field-based measurement approach. Instead of mechanically or electrically connecting measurement probes directly to insulation points, the system uses conductor tracks that respond to electromagnetic fields and partial discharge effects, enabling non-intrusive measurement of insulation degradation.
2Measurement precision
If the machine is shut down to detect overvoltages, then accurate measurement can be performed, but continuous operation and productivity are reduced
Solution Approach 1:
The patent enables continuous monitoring of overvoltages during machine operation. The conductor tracks remain in position throughout operation, and the measuring device can continuously or periodically measure resistance changes without requiring machine shutdown, maintaining both measurement capability and operational continuity.
Solution Approach 2:
The conductor tracks automatically respond to overvoltage conditions through partial discharge effects, changing their resistance in proportion to the overvoltage magnitude. This self-responsive behavior eliminates the need for active probing or complex measurement systems, allowing continuous passive monitoring during normal operation.
3Measurement precision
If conductor tracks are directly connected to both electrical conductors, then complete voltage measurement is possible, but safety and isolation are compromised
Solution Approach 1:
The conductor tracks serve as an intermediary between the high-voltage conductors and the measurement system. They are positioned to capture partial discharge effects from overvoltages without direct electrical connection to both conductors, providing measurement capability while maintaining electrical isolation and safety.
Solution Approach 2:
The measurement system is segmented into multiple conductor tracks, each connected to only one high-voltage conductor. This segmentation allows the system to measure voltage differences and overvoltages through resistance changes in individual tracks without requiring any single track to be exposed to full high voltage, distributing the electrical stress and improving safety.
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 timely detection of overvoltages that could damage insulation, preventing machine failure by measuring resistance changes in conductor tracks, allowing for continuous operation and reducing the risk of insulation degradation.
Implementation Method 1
a prespecified overvoltage between the two electrical conductors causes a partial discharge that changes the electrical resistance of the one conductor track
Implementation Method 2
composite materials with conductive fillers that increase resistance upon partial discharge
Data Source
AI summary
A verification device for verifying an electrical overvoltage between two electrical conductors includes a conductor-track carrier made of an electrically insulating carrier material, a plurality of conductor tracks applied in spaced-apart relation from one another on the conductor-track carrier, and a measuring device acquiring an electrical resistance of one of the conductor tracks. Each of the two electrical conductors is electrically connected to at least one of the conductor tracks with the proviso that none of the conductor tracks is electrically connected to both of the two electrical conductors. The conductor tracks are configured such that a prespecified overvoltage between the two electrical conductors causes a partial discharge that changes the electrical resistance of the one conductor track between the one conductor track and another one of the conductor tracks that is electrically connected to one of the two electrical conductors.