Impulse Voltage Testing With Active Damped Oscillation Termination
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Solution Overview
Problem
Existing impulse voltage testing methods for electrical systems, such as electric motors and generators, are limited by low repetition rates due to the time required for damped oscillations to decay naturally, which prolongs the testing process.
Innovation Solution
The method involves applying an electrical voltage pulse to the system using semiconductor elements, actively terminating the damped oscillation by disconnecting the energy storage device and discharging gate terminal capacitances, allowing for rapid repetition of the test process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the damped oscillation is allowed to decay naturally, then the measurement accuracy is maintained, but the testing time increases significantly
Solution Approach 1:
The patent applies preliminary action by actively terminating the damped oscillation through switching the semiconductor element to the second state before the oscillation naturally decays. This preliminary termination allows the energy storage device to be recharged and the test process to be repeated, significantly reducing the time loss while maintaining measurement accuracy through analysis of the voltage waveform during the active test phase.
2Productivity
If the semiconductor elements are switched back to the second state quickly, then the repetition rate increases, but the gate terminal capacitance must be discharged
Solution Approach 1:
The patent applies self-service by using the energy storage device itself to discharge the gate terminal capacitance when switching to the second state. The energy storage device provides the discharge path for the gate capacitance, eliminating the need for separate discharge circuits and reducing overall device complexity while enabling rapid repetition of the test process.
3Measurement precision
If the voltage pulse amplitude is increased quickly, then the test sensitivity improves, but the energy storage device must be recharged rapidly
Solution Approach 1:
The patent applies preliminary action by actively terminating the damped oscillation and recharging the energy storage device immediately after the voltage pulse is applied and the voltage waveform is measured. This preliminary recharging action prepares the system for the next high-amplitude voltage pulse, maintaining test sensitivity while enabling rapid repetition through proactive energy restoration.
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 significantly increases the repetition rate of impulse voltage tests, enabling multiple tests to be conducted in a fraction of the time required by traditional methods, enhancing efficiency in industrial production.
Implementation Method 1
a charged capacitor is connected in parallel to the winding under test relatively quickly. This generates a relatively high voltage in the winding for a relatively short time. The energy stored in the capacitor discharges into the inductor.
Implementation Method 2
The energy stored in the capacitor discharges into the inductor. The energy then stored in the inductor discharges back into the capacitor.
Implementation Method 3
Due to damping losses, this process can be measured at the winding terminals as a damped oscillation.
Implementation Method 4
The voltage pulse is triggered by connecting semiconductor elements to a first state. These semiconductor elements can, for example, be cascaded. In the first state, the semiconductor elements connect an electrical energy storage device, such as a capacitor, to the electrical system.
Implementation Method 5
In addition to actively terminating the damped oscillation, the capacitances at the gate terminals can be actively discharged. This is advantageous for quickly switching the semiconductor elements back to a second state in which the electrical energy storage device is disconnected from the electrical system.
Data Source
Figure 1
AI summary
The invention relates to a method for impulse voltage testing of an electrical system, comprising the following steps: - supplying an electrical impulse to the electrical system via two electrical contacts of the electrical system, wherein the supply of the impulse is triggered by switching semiconductor elements (4) to a first state, wherein the semiconductor elements (4) in the first state electrically connect an electrical energy storage device to the electrical system, wherein the semiconductor elements (4) each have a gate terminal, wherein a capacitance is charged at the gate terminal when the semiconductor elements (4) are switched to the first state; - measuring a voltage waveform between the two electrical contacts directly after the supply of the impulse, wherein the voltage waveform comprises a damped oscillation;characterized by the fact that the damped oscillation is actively terminated and/or that the capacitances at the gate terminals are actively discharged.