Voltage-Dependent Fault Detection in Electrical Windings
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Solution Overview
Problem
Existing methods for detecting voltage-dependent errors in electrical winding systems struggle to accurately distinguish between manufacturing tolerances and small voltage-dependent errors, often requiring lengthy testing processes.
Innovation Solution
The procedure involves submitting at least two shock voltage impulses with different peak values to the electrical winding system, measuring the resulting voltage processes, and comparing the measured second voltage course with a calculated second voltage course based on the first measured voltage course, to identify any voltage-dependent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the peak voltage is increased step by step to detect small voltage-dependent faults, then the detection precision is improved, but the test duration increases
Solution Approach 1:
The patent applies preliminary action by measuring a first voltage curve at a lower peak voltage before conducting the main test at higher peak voltage. This preliminary measurement is used to calculate an expected second voltage curve, which serves as a reference for detecting deviations. By performing this preparatory measurement and calculation beforehand, the method enables faster detection during the actual high-voltage test without requiring multiple incremental steps, thus resolving the contradiction between detection precision and test duration.
2Measurement precision
If the voltage increase per step is reduced to compensate for smaller percentage changes at higher peak voltages, then the detection precision is improved, but the test duration increases
Solution Approach 1:
The patent applies parameter changes by using a calculated expected voltage curve derived from measurements at one voltage level to evaluate performance at a different voltage level. Instead of incrementally increasing voltage in small steps and measuring at each step, the method calculates what the voltage curve should be at the higher peak voltage based on the first measurement, then directly compares the actual second measurement against this calculated reference. This changes the evaluation parameter from incremental step-wise comparison to direct comparison against a scaled reference, improving efficiency while maintaining precision.
3Ease of operation
If a reference winding is used to compare with the winding under test, then the measurement process is simplified, but the ability to detect small voltage-dependent errors decreases due to manufacturing tolerances
Solution Approach 1:
The patent applies copying by creating a calculated copy of the voltage curve from the first measurement rather than using a physical reference winding. The expected second voltage curve is generated by scaling the first measured voltage curve according to the ratio of peak voltages, creating a theoretical reference that should match the actual second measurement if no faults exist. This calculated copy eliminates the need for physical reference windings and their associated manufacturing tolerances, while maintaining measurement simplicity through computational comparison.
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 approach allows for the accurate recognition of voltage-dependent errors, including small ones, by comparing measured and calculated voltage processes, thereby improving the reliability and efficiency of the error detection process.
Implementation Method 1
a charged capacitor is discharged relatively quickly in parallel with the electrical winding to be tested. This generates a relatively high voltage in the electrical winding for a relatively short time, the so-called surge voltage pulse. The energy stored in the capacitor discharges into the inductance.
Implementation Method 2
The energy stored in the capacitor discharges into the inductance. The energy then stored in the inductance discharges back into the capacitor.
Implementation Method 3
Due to damping losses, this process can be measured as a damped oscillation at the terminals of the electrical winding.
Data Source
Figure 1
AI summary
The invention relates to a method for detecting voltage-dependent faults in an electrical winding system, comprising at least the following steps: - supplying at least two impulse voltage pulses to the electrical winding system, each impulse voltage pulse having a different peak value Ut, - measuring voltage waveforms on the electrical winding system after the supply of each impulse voltage pulse, the voltage waveforms each comprising a damped oscillation, each voltage waveform being caused by one of the impulse voltage pulses, - storing the voltage waveforms, wherein - a first voltage waveform caused by a first impulse voltage pulse is used as a reference to calculate a second voltage waveform caused by a second impulse voltage pulse.- the calculated second voltage curve and the measured second voltage curve are compared, - if the difference between the calculated and the measured second voltage curve exceeds a limit value, a voltage-dependent fault in the electrical winding system is detected.